3 * - close idle connections
4 * - cope better with garbage in feed file
5 * - cope better with NULs in feed file
10 * Newsfeeds file entries should look like this:
11 * host.name.of.site[/exclude,exclude,...]\
12 * :pattern,pattern...[/distribution,distribution...]\
16 * sitename[/exclude,exclude,...]\
17 * :pattern,pattern...[/distribution,distribution...]\
23 * or might be blanked out
24 * <spc><spc><spc><spc>....
26 * F site.name main feed file
27 * opened/created, then written, by innd
30 * tokens blanked out by duct when processed
31 * site.name_lock lock preventing multiple ducts
32 * to hold lock must open,F_SETLK[W]
33 * and then stat to check that locked file
34 * still has name site.name_lock
35 * holder of this lock is "duct"
36 * (only) lockholder may remove the lockfile
37 * D site.name_flushing temporary feed file during flush (or crash)
38 * hardlink created by duct
40 * site.name_defer 431'd articles, still being written,
41 * created, written, used by duct
43 * site.name_backlog.<date>.<inum>
44 * 431'd articles, ready for innxmit or duct
45 * created (link/mv) by duct
46 * site.name_backlog<anything-else> (where <anything-else> does not
47 * contain '#' or '~') eg
48 * site.name_backlog.manual
49 * anything the sysadmin likes (eg, feed files
50 * from old feeds to be merged into this one)
51 * created (link/mv) by admin
52 * may be symlinks (in which case links
53 * may be written through, but only links
56 * It is safe to remove backlog files manually,
57 * if it's desired to throw away the backlog.
59 * Backlog files are also processed by innduct. We find the oldest
60 * backlog file which is at least a certain amount old, and feed it
61 * back into our processing. When every article in it has been read
62 * and processed, we unlink it and look for another backlog file.
64 * If we don't have a backlog file that we're reading, we close the
65 * defer file that we're writing and make it into a backlog file at
66 * the first convenient opportunity.
77 | | <----------------<---------------------------------'|
83 | F: innd writing, duct reading |
86 | | duct decides time to flush |
87 | | duct makes hardlink |
89 | V <------------------------'|
91 | F == D: innd writing, duct reading both exist |
94 | | <-----------<-------------<--'|
98 | V <---------------------. |
101 | D: innd writing, duct reading; or ENOENT | |
103 | | duct requests flush of feed | |
104 | | (others can too, harmlessly) | |
108 | D: innd flushing, duct; or ENOENT | |
110 | | inndcomm flush fails | |
111 | |`-------------------------->------------------' |
113 | | inndcomm reports no such site |
114 | |`---------------------------------------------------- | -.
116 | | innd finishes writing D, creates F | |
117 | | inndcomm reports flush successful | |
120 | Separated <----------------' |
121 | F: innd writing F!=D /
122 | D: duct reading; or ENOENT both exist /
124 | | duct gets to the end of D /
125 | | duct opens F too /
128 | F: innd writing, duct reading |
129 | D: duct finishing V
131 | | duct finishes processing D F: ENOENT
132 | V duct unlinks D D: duct reading
134 `--<--' | duct finishes
144 "duct reading" means innduct is reading the file but also
145 overwriting processed tokens.
149 * rune for printing diagrams:
151 perl -ne 'print if m/-8\<-/..m/-\>8-/; print "\f" if m/-\^L-/' backends/innduct.c |a2ps -R -B -ops
156 /*============================== PROGRAM ==============================*/
160 #include "inn/list.h"
167 #include <sys/types.h>
168 #include <sys/wait.h>
169 #include <sys/stat.h>
170 #include <sys/socket.h>
183 #include <oop-read.h>
185 /*----- general definitions, probably best not changed -----*/
187 #define PERIOD_SECONDS 60
189 #define CONNCHILD_ESTATUS_STREAM 4
190 #define CONNCHILD_ESTATUS_NOSTREAM 5
192 #define INNDCOMMCHILD_ESTATUS_FAIL 6
193 #define INNDCOMMCHILD_ESTATUS_NONESUCH 7
195 /*----- doubly linked lists -----*/
197 #define ISNODE(T) struct { T *succ, *pred; } node /* must be at start */
198 #define DEFLIST(T) typedef struct { T *hd, *tl, *tp; int count; } T##List
200 #define NODE(n) (assert((void*)&(n)->node == &(n)), \
201 (struct node*)&(n)->node)
203 #define LIST_CHECKCANHAVENODE(l,n) \
204 ((void)((n) == ((l).hd))) /* just for the type check */
206 #define LIST_ADDSOMEHOW(l,n,list_addsomehow) \
207 ( LIST_CHECKCANHAVENODE(l,n), \
208 list_addsomehow((struct list*)&(l), NODE((n))), \
212 #define LIST_REMSOMEHOW(l,list_remsomehow) \
216 list_remsomehow((struct list*)&(l)) ) \
222 #define LIST_ADDHEAD(l,n) LIST_ADDSOMEHOW((l),(n),list_addhead)
223 #define LIST_ADDTAIL(l,n) LIST_ADDSOMEHOW((l),(n),list_addtail)
224 #define LIST_REMHEAD(l) LIST_REMSOMEHOW((l),list_remhead)
225 #define LIST_REMTAIL(l) LIST_REMSOMEHOW((l),list_remtail)
227 #define LIST_HEAD(l) ((typeof((l).hd))(list_head((struct list*)&(l))))
228 #define LIST_NEXT(n) ((typeof(n))list_succ(NODE((n))))
229 #define LIST_BACK(n) ((typeof(n))list_pred(NODE((n))))
231 #define LIST_REMOVE(l,n) \
232 ( LIST_CHECKCANHAVENODE(l,n), \
233 list_remove(NODE((n))), \
237 #define LIST_INSERT(l,n,pred) \
238 ( LIST_CHECKCANHAVENODE(l,n), \
239 LIST_CHECKCANHAVENODE(l,pred), \
240 list_insert((struct list*)&(l), NODE((n)), NODE((pred))), \
244 /*----- type predeclarations -----*/
246 typedef struct Conn Conn;
247 typedef struct Article Article;
248 typedef struct InputFile InputFile;
249 typedef struct XmitDetails XmitDetails;
250 typedef enum StateMachineState StateMachineState;
255 /*----- function predeclarations -----*/
257 static void conn_maybe_write(Conn *conn);
258 static void conn_make_some_xmits(Conn *conn);
259 static void *conn_write_some_xmits(Conn *conn);
261 static void xmit_free(XmitDetails *d);
263 static int filemon_init(void);
264 static void filemon_setfile(int mainfeed_fd, const char *mainfeed_path);
265 static void filemon_callback(void);
267 static void statemc_setstate(StateMachineState newsms, int periods,
268 const char *forlog, const char *why);
269 static void check_master_queue(void);
270 static void queue_check_input_done(void);
272 static void statemc_start_flush(const char *why); /* Normal => Flushing */
273 static void statemc_check_flushing_done(void);
274 static void statemc_check_backlog_done(void);
276 static void postfork(const char *what);
277 static void postfork_inputfile(InputFile *ipf);
279 static void open_defer(void);
281 static void inputfile_tailing_start(InputFile *ipf);
282 static void inputfile_tailing_stop(InputFile *ipf);
284 /*----- configuration options -----*/
286 static char *sitename, *feedfile;
287 static const char *remote_host;
288 static int quiet_multiple=0, become_daemon=1;
290 static int max_connections=10, max_queue_per_conn=200;
291 static int target_max_feedfile_size=100000;
293 static int connection_setup_timeout=200, port=119, try_stream=1;
294 static int inndcomm_flush_timeout=100;
295 static int reconnect_delay_periods, flushfail_retry_periods, open_wait_periods;
296 static int backlog_retry_minperiods, backlog_spontaneous_rescan_periods;
297 static const char *inndconffile;
299 static double accept_proportion;
300 static double nocheck_thresh_pct= 95.0;
301 static double nocheck_thresh; /* computed in main from _pct */
302 static double nocheck_decay_articles= 100; /* converted to _decay */
303 static double nocheck_decay; /* computed in main from _articles */
304 static int nocheck, nocheck_reported;
307 /*----- statistics -----*/
309 typedef enum { /* in queue in conn->sent */
310 art_Unchecked, /* not checked, not sent checking */
311 art_Wanted, /* checked, wanted sent body as requested */
312 art_Unsolicited, /* - sent body without check */
316 #define RESULT_COUNTS(RCS,RCN) \
324 #define RCI_TRIPLE_FMT_BASE "%d(id%d+bd%d+nc%d)"
325 #define RCI_TRIPLE_VALS_BASE(counts,x) \
326 counts[art_Unchecked] x \
327 + counts[art_Wanted] x \
328 + counts[art_Unsolicited] x, \
329 counts[art_Unchecked] x \
330 , counts[art_Wanted] x \
331 , counts[art_Unsolicited] x
334 #define RC_INDEX(x) RC_##x,
335 RESULT_COUNTS(RC_INDEX, RC_INDEX)
340 /*----- transmission buffers -----*/
345 xk_Malloc, xk_Const, xk_Artdata
357 /*----- core operational data structure types -----*/
360 /* This is also an instance of struct oop_readable */
361 struct oop_readable readable; /* first */
362 oop_readable_call *readable_callback;
363 void *readable_callback_user;
366 struct Filemon_Perfile *filemon;
369 long inprogress; /* no. of articles read but not processed */
372 int counts[art_MaxState][RCI_max];
387 #define SMS_LIST(X) \
395 enum StateMachineState {
396 #define SMS_DEF_ENUM(s) sm_##s,
397 SMS_LIST(SMS_DEF_ENUM)
400 static const char *sms_names[]= {
401 #define SMS_DEF_NAME(s) #s ,
402 SMS_LIST(SMS_DEF_NAME)
408 int fd, max_queue, stream, quitting;
409 ArticleList waiting; /* not yet told peer */
410 ArticleList priority; /* peer says send it now */
411 ArticleList sent; /* offered/transmitted - in xmit or waiting reply */
412 struct iovec xmit[CONNIOVS];
413 XmitDetails xmitd[CONNIOVS];
418 /*----- operational variables -----*/
420 static oop_source *loop;
422 static int until_connect;
423 static ConnList conns;
424 static ArticleList queue;
426 static char *path_lock, *path_flushing, *path_defer;
428 #define SMS(newstate, periods, why) \
429 (statemc_setstate(sm_##newstate,(periods),#newstate,(why)))
431 static StateMachineState sms;
433 static InputFile *main_input_file, *flushing_input_file, *backlog_input_file;
434 static int sm_period_counter;
437 /*========== logging ==========*/
439 static void logcore(int sysloglevel, const char *fmt, ...)
440 __attribute__((__format__(printf,2,3)));
441 static void logcore(int sysloglevel, const char *fmt, ...) {
445 vsyslog(sysloglevel,fmt,al);
447 vfprintf(stderr,fmt,al);
453 static void logv(int sysloglevel, const char *pfx, int errnoval,
454 int exitstatus, const char *fmt, va_list al)
455 __attribute__((__format__(printf,5,0)));
456 static void logv(int sysloglevel, const char *pfx, int errnoval,
457 int exitstatus, const char *fmt, va_list al) {
458 char msgbuf[256]; /* NB do not call xvasprintf here or you'll recurse */
459 vsnprintf(msgbuf,sizeof(msgbuf), fmt,al);
460 msgbuf[sizeof(msgbuf)-1]= 0;
462 if (sysloglevel >= LOG_ERR && (errnoval==EACCES || errnoval==EPERM))
463 sysloglevel= LOG_ERR; /* run by wrong user, probably */
465 logcore(sysloglevel, "<%s>%s: %s%s%s",
466 sitename, pfx, msgbuf,
467 errnoval>=0 ? ": " : "",
468 errnoval>=0 ? strerror(errnoval) : "");
471 #define logwrap(fn, pfx, sysloglevel, err, estatus) \
472 static void fn(const char *fmt, ...) \
473 __attribute__((__format__(printf,1,2))); \
474 static void fn(const char *fmt, ...) { \
477 logv(sysloglevel, pfx, err, estatus, fmt, al); \
480 logwrap(sysdie, " critical", LOG_CRIT, errno, 16);
481 logwrap(die, " critical", LOG_CRIT, -1, 16);
483 logwrap(sysfatal, " fatal", LOG_ERR, errno, 12);
484 logwrap(fatal, " fatal", LOG_ERR, -1, 12);
486 logwrap(syswarn, " warning", LOG_WARNING, errno, 0);
487 logwrap(warn, " warning", LOG_WARNING, -1, 0);
489 logwrap(notice, "", LOG_NOTICE, -1, 0);
490 logwrap(info, " info", LOG_INFO, -1, 0);
491 logwrap(debug, " debug", LOG_DEBUG, -1, 0);
494 /*========== utility functions etc. ==========*/
496 static char *xvasprintf(const char *fmt, va_list al)
497 __attribute__((__format__(printf,1,0)));
498 static char *xvasprintf(const char *fmt, va_list al) {
500 int rc= vasprintf(&str,fmt,al);
501 if (rc<0) sysdie("vasprintf(\"%s\",...) failed", fmt);
504 static char *xasprintf(const char *fmt, ...)
505 __attribute__((__format__(printf,1,2)));
506 static char *xasprintf(const char *fmt, ...) {
509 char *str= xvasprintf(fmt,al);
514 static void perhaps_close(int *fd) { if (*fd) { close(*fd); fd=0; } }
516 static pid_t xfork(const char *what) {
520 if (child==-1) sysdie("cannot fork for %s",what);
521 if (!child) postfork(what);
522 debug("forked %s %ld", what, (unsigned long)child);
526 static void on_fd_read_except(int fd, oop_call_fd callback) {
527 loop->on_fd(loop, fd, OOP_READ, callback, 0);
528 loop->on_fd(loop, fd, OOP_EXCEPTION, callback, 0);
530 static void cancel_fd_read_except(int fd) {
531 loop->cancel_fd(loop, fd, OOP_READ);
532 loop->cancel_fd(loop, fd, OOP_EXCEPTION);
535 static void report_child_status(const char *what, int status) {
536 if (WIFEXITED(status)) {
537 int es= WEXITSTATUS(status);
539 warn("%s: child died with error exit status %d",es);
540 } else if (WIFSIGNALED(status)) {
541 int sig= WTERMSIG(status);
542 const char *sigstr= strsignal(sig);
543 const char *coredump= WCOREDUMP(status) ? " (core dumped)" : "";
545 warn("%s: child died due to fatal signal %s%s", what, sigstr, coredump);
547 warn("%s: child died due to unknown fatal signal %d%s",
548 what, sig, coredump);
550 warn("%s: child died with unknown wait status %d", status);
554 static int xwaitpid(pid_t *pid, const char *what) {
557 int r= kill(*pid, SIGKILL);
558 if (r) sysdie("cannot kill %s child", what);
560 pid_t got= waitpid(*pid, &status, WNOHANG);
561 if (got==-1) sysdie("cannot reap %s child", what);
568 static void xunlink(const char *path, const char *what) {
570 if (r) sysdie("can't unlink %s %s", path, what);
573 static void check_isreg(const struct stat *stab, const char *path,
575 if (!S_ISREG(stab->st_mode))
576 die("%s %s not a plain file (mode 0%lo)",
577 what, path, (unsigned long)stab->st_mode);
580 static void xfstat(int fd, struct stat *stab_r, const char *what) {
581 int r= fstat(fd, stab_r);
582 if (r) sysdie("could not fstat %s", what);
585 static void xfstat_isreg(int fd, struct stat *stab_r,
586 const char *path, const char *what) {
587 xfstat(fd, stab_r, what);
588 check_isreg(stab_r, path, what);
591 static void xlstat_isreg(const char *path, struct stat *stab,
592 int *enoent_r /* 0 means ENOENT is fatal */,
594 int r= lstat(path, stab);
596 if (errno==ENOENT && enoent_r) { *enoent_r=1; return; }
597 sysdie("could not lstat %s %s", what, path);
599 if (enoent_r) *enoent_r= 0;
600 check_isreg(stab, path, what);
603 static void setnonblock(int fd, int nonblocking) {
604 int r= fcntl(fd, F_GETFL); if (r<0) sysdie("setnonblocking fcntl F_GETFL");
605 if (nonblocking) r |= O_NONBLOCK;
606 else r &= ~O_NONBLOCK;
607 r= fcntl(fd, F_SETFL, r); if (r<0) sysdie("setnonblocking fcntl F_SETFL");
610 static int samefile(const struct stat *a, const struct stat *b) {
611 assert(S_ISREG(a->st_mode));
612 assert(S_ISREG(b->st_mode));
613 return (a->st_ino == b->st_ino &&
614 a->st_dev == b->st_dev);
617 static char *sanitise(const char *input) {
618 static char sanibuf[100]; /* returns pointer to this buffer! */
620 const char *p= input;
624 if (q > sanibuf+sizeof(sanibuf)-8) { strcpy(q,"'.."); break; }
626 if (!c) { *q++= '\''; *q=0; break; }
627 if (c>=' ' && c<=126 && c!='\\') { *q++= c; continue; }
628 sprintf(q,"\\x%02x",c);
634 /*========== making new connections ==========*/
636 static void conn_dispose(Conn *conn) {
638 perhaps_close(&conn->fd);
640 until_connect= reconnect_delay_periods;
643 static int connecting_sockets[2]= {-1,-1};
644 static pid_t connecting_child;
646 static void connect_attempt_discard(void) {
647 if (connecting_sockets[0])
648 cancel_fd_read_except(connecting_sockets[0]);
650 perhaps_close(&connecting_sockets[0]);
651 perhaps_close(&connecting_sockets[1]);
653 if (connecting_child) {
654 int r= kill(connecting_child, SIGTERM);
655 if (r) syswarn("failed to kill connecting child");
656 int status= xwaitpid(&connecting_child, "connect");
658 if (!(WIFEXITED(status) ||
659 (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL)))
660 report_child_status("connect", status);
664 #define PREP_DECL_MSG_CMSG(msg) \
666 memset(&msg,0,sizeof(msg)); \
667 char msg##cbuf[CMSG_SPACE(sizeof(fd))]; \
668 msg.msg_control= msg##cbuf; \
669 msg.msg_controllen= sizeof(msg##cbuf);
671 static void *connchild_event(oop_source *lp, int fd, oop_event e, void *u) {
674 conn= xmalloc(sizeof(*conn));
675 memset(conn,0,sizeof(*conn));
677 PREP_DECL_MSG_CMSG(msg);
678 struct cmsghdr *h= 0;
679 ssize_t rs= recvmsg(fd, &msg, MSG_DONTWAIT);
680 if (rs >= 0) h= CMSG_FIRSTHDR(&msg);
683 pid_t got= waitpid(connecting_child, &status, WNOHANG);
685 assert(got==connecting_child);
687 if (WIFEXITED(status) &&
688 (WEXITSTATUS(status) != 0 &&
689 WEXITSTATUS(status) != CONNCHILD_ESTATUS_STREAM &&
690 WEXITSTATUS(status) != CONNCHILD_ESTATUS_NOSTREAM)) {
691 /* child already reported the problem */
692 } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALRM) {
693 warn("connect: connection attempt timed out");
694 } else if (!WIFEXITED(status)) {
695 report_child_status("connect", status);
696 /* that's probably the root cause then */
699 /* child is still running apparently, report the socket problem */
701 syswarn("connect: read from child socket failed");
702 else if (e == OOP_EXCEPTION)
703 warn("connect: unexpected exception on child socket");
705 warn("connect: unexpected EOF on child socket");
710 #define CHK(field, val) \
711 if (h->cmsg_##field != val) { \
712 die("connect: child sent cmsg with cmsg_" #field "=%d, expected %d"); \
715 CHK(level, SOL_SOCKET);
716 CHK(type, SCM_RIGHTS);
717 CHK(len, CMSG_LEN(sizeof(conn->fd)));
720 if (CMSG_NXTHDR(&msg,h)) { die("connect: child sent many cmsgs"); goto x; }
722 memcpy(&conn->fd, CMSG_DATA(h), sizeof(conn->fd));
725 pid_t got= waitpid(connecting_child, &status, 0);
726 if (got==-1) sysdie("connect: real wait for child");
727 assert(got == connecting_child);
730 if (!WIFEXITED(status)) { report_child_status("connect",status); goto x; }
731 int es= WEXITSTATUS(status);
733 case CONNCHILD_ESTATUS_STREAM: conn->stream= 1; break;
734 case CONNCHILD_ESTATUS_NOSTREAM: conn->stream= 0; break;
736 fatal("connect: child gave unexpected exit status %d", es);
740 setnonblock(conn->fd, 1);
741 conn->max_queue= conn->stream ? max_queue_per_conn : 1;
742 LIST_ADDHEAD(conns, conn);
743 notice("#%d connected %s", conn->fd, conn->stream ? "streaming" : "plain");
744 connect_attempt_discard();
745 check_master_queue();
750 connect_attempt_discard();
753 static int allow_connect_start(void) {
754 return conns.count < max_connections
759 static void connect_start(void) {
760 assert(!connecting_sockets[0]);
761 assert(!connecting_sockets[1]);
762 assert(!connecting_child);
764 notice("starting connection attempt");
766 int r= socketpair(AF_UNIX, SOCK_STREAM, 0, connecting_sockets);
767 if (r) { syswarn("connect: cannot create socketpair for child"); goto x; }
769 connecting_child= xfork("connection");
771 if (!connecting_child) {
772 FILE *cn_from, *cn_to;
773 char buf[NNTP_STRLEN+100];
774 int exitstatus= CONNCHILD_ESTATUS_NOSTREAM;
776 r= close(connecting_sockets[0]);
777 if (r) sysdie("connect: close parent socket in child");
779 alarm(connection_setup_timeout);
780 if (NNTPconnect((char*)remote_host, port, &cn_from, &cn_to, buf) < 0) {
781 if (buf[0]) fatal("connect: rejected: %s", sanitise(buf));
782 else sysfatal("connect: connection attempt failed");
784 if (NNTPsendpassword((char*)remote_host, cn_from, cn_to) < 0)
785 sysfatal("connect: authentication failed");
787 if (fputs("MODE STREAM\r\n", cn_to) ||
789 sysfatal("connect: could not send MODE STREAM");
790 buf[sizeof(buf)-1]= 0;
791 if (!fgets(buf, sizeof(buf)-1, cn_from)) {
793 sysfatal("connect: could not read response to MODE STREAM");
795 fatal("connect: connection close in response to MODE STREAM");
800 fatal("connect: response to MODE STREAM is too long: %.100s...",
801 remote_host, sanitise(buf));
802 l--; if (l>0 && buf[l-1]=='\r') l--;
805 int rcode= strtoul(buf,&ep,10);
807 fatal("connect: bad response to MODE STREAM: %.50s", sanitise(buf));
811 exitstatus= CONNCHILD_ESTATUS_STREAM;
817 warn("connect: unexpected response to MODE STREAM: %.50s",
823 int fd= fileno(cn_from);
825 PREP_DECL_MSG_CMSG(msg);
826 struct cmsghdr *cmsg= CMSG_FIRSTHDR(&msg);
827 cmsg->cmsg_level= SOL_SOCKET;
828 cmsg->cmsg_type= SCM_RIGHTS;
829 cmsg->cmsg_len= CMSG_LEN(sizeof(fd));
830 memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
832 msg.msg_controllen= cmsg->cmsg_len;
833 r= sendmsg(connecting_sockets[1], &msg, 0);
834 if (r) sysdie("sendmsg failed for new connection");
839 r= close(connecting_sockets[1]); connecting_sockets[1]= 0;
840 if (r) sysdie("connect: close child socket in parent");
842 on_fd_read_except(connecting_sockets[0], connchild_event);
846 connect_attempt_discard();
850 /*========== overall control of article flow ==========*/
852 static void check_master_queue(void) {
860 /* Find a connection to offer this article. We prefer a busy
861 * connection to an idle one, provided it's not full. We take the
862 * first (oldest) and since that's stable, it will mean we fill up
863 * connections in order. That way if we have too many
864 * connections, the spare ones will go away eventually.
866 for (walk=LIST_HEAD(conns); walk; walk=LIST_NEXT(walk)) {
867 int inqueue= walk->sent.count + walk->priority.count
868 + walk->waiting.count;
869 spare= walk->max_queue - inqueue;
870 assert(inqueue <= max_queue_per_conn);
872 if (inqueue==0) /*idle*/ { if (!use) use= walk; }
873 else if (spare>0) /*working*/ { use= walk; break; }
877 Article *art= LIST_REMHEAD(queue);
878 LIST_ADDTAIL(use->waiting, art);
881 conn_maybe_write(use);
882 } else if (allow_connect_start()) {
883 until_connect= reconnect_delay_periods;
892 static void *conn_writeable(oop_source *l, int fd, oop_event ev, void *u) {
897 static void conn_maybe_write(Conn *conn) {
900 conn_make_some_xmits(conn);
902 loop->cancel_fd(loop, conn->fd, OOP_WRITE);
906 void *rp= conn_write_some_xmits(conn);
907 if (rp==OOP_CONTINUE) {
908 loop->on_fd(loop, conn->fd, OOP_WRITE, conn_writeable, conn);
910 } else if (rp==OOP_HALT) {
913 /* transmitted everything */
920 static void vconnfail(Conn *conn, const char *fmt, va_list al)
921 __attribute__((__format__(printf,2,0)));
923 static void vconnfail(Conn *conn, const char *fmt, va_list al) {
924 int requeue[art_MaxState];
927 while ((art= LIST_REMHEAD(conn->priority))) LIST_ADDTAIL(queue, art);
928 while ((art= LIST_REMHEAD(conn->waiting))) LIST_ADDTAIL(queue, art);
929 while ((art= LIST_REMHEAD(conn->sent))) {
930 requeue[art->state]++;
931 if (art->state==art_Unsolicited) art->state= art_Unchecked;
932 LIST_ADDTAIL(queue,art);
937 for (i=0, d=conn->xmitd; i<conn->xmitu; i++, d++)
940 char *m= xvasprintf(fmt,al);
941 warn("#%d connection failed, requeueing " RCI_TRIPLE_FMT_BASE ": %s",
942 conn->fd, RCI_TRIPLE_VALS_BASE(requeue, /*nothing*/), m);
945 LIST_REMOVE(conns,conn);
947 check_master_queue();
950 static void connfail(Conn *conn, const char *fmt, ...)
951 __attribute__((__format__(printf,2,3)));
952 static void connfail(Conn *conn, const char *fmt, ...) {
955 vconnfail(conn,fmt,al);
959 /*========== article transmission ==========*/
961 static XmitDetails *xmit_core(Conn *conn, const char *data, int len,
962 XmitKind kind) { /* caller must then fill in details */
963 struct iovec *v= &conn->xmit[conn->xmitu];
964 XmitDetails *d= &conn->xmitd[conn->xmitu++];
965 v->iov_base= (char*)data;
971 static void xmit_noalloc(Conn *conn, const char *data, int len) {
972 xmit_core(conn,data,len, xk_Const);
974 #define XMIT_LITERAL(lit) (xmit_noalloc(conn, (lit), sizeof(lit)-1))
976 static void xmit_artbody(Conn *conn, ARTHANDLE *ah /* consumed */) {
977 XmitDetails *d= xmit_core(conn, ah->data, ah->len, xk_Artdata);
981 static void xmit_free(XmitDetails *d) {
983 case xk_Malloc: free(d->info.malloc_tofree); break;
984 case xk_Artdata: SMfreearticle(d->info.sm_art); break;
985 case xk_Const: break;
990 static void *conn_write_some_xmits(Conn *conn) {
992 * 0: nothing more to write, no need to call us again
993 * OOP_CONTINUE: more to write but fd not writeable
994 * OOP_HALT: disaster, have destroyed conn
997 int count= conn->xmitu;
998 if (!count) return 0;
1000 if (count > IOV_MAX) count= IOV_MAX;
1001 ssize_t rs= writev(conn->fd, conn->xmit, count);
1003 if (errno == EAGAIN) return OOP_CONTINUE;
1004 connfail(conn, "write failed: %s", strerror(errno));
1010 for (done=0; rs && done<conn->xmitu; done++) {
1011 struct iovec *vp= &conn->xmit[done];
1012 XmitDetails *dp= &conn->xmitd[done];
1013 if (rs > vp->iov_len) {
1021 int newu= conn->xmitu - done;
1022 memmove(conn->xmit, conn->xmit + done, newu * sizeof(*conn->xmit));
1023 memmove(conn->xmitd, conn->xmitd + done, newu * sizeof(*conn->xmitd));
1028 static void conn_make_some_xmits(Conn *conn) {
1030 if (conn->xmitu+5 > CONNIOVS)
1033 Article *art= LIST_REMHEAD(conn->priority);
1034 if (!art) art= LIST_REMHEAD(conn->waiting);
1037 if (art->state >= art_Wanted || (conn->stream && nocheck)) {
1038 /* actually send it */
1040 ARTHANDLE *artdata= SMretrieve(art->token, RETR_ALL);
1044 XMIT_LITERAL("TAKETHIS ");
1045 xmit_noalloc(conn, art->messageid, art->midlen);
1046 XMIT_LITERAL("\r\n");
1047 xmit_artbody(conn, artdata);
1050 /* we got 235 from IHAVE */
1052 xmit_artbody(conn, artdata);
1054 XMIT_LITERAL(".\r\n");
1059 art->state == art_Unchecked ? art_Unsolicited :
1060 art->state == art_Wanted ? art_Wanted :
1062 art->ipf->counts[art->state][RC_sent]++;
1063 LIST_ADDTAIL(conn->sent, art);
1069 XMIT_LITERAL("IHAVE ");
1071 XMIT_LITERAL("CHECK ");
1072 xmit_noalloc(conn, art->messageid, art->midlen);
1073 XMIT_LITERAL("\r\n");
1075 assert(art->state == art_Unchecked);
1076 art->ipf->counts[art->state][RC_sent]++;
1077 LIST_ADDTAIL(conn->sent, art);
1083 /*========== handling responses from peer ==========*/
1085 static const oop_rd_style peer_rd_style= {
1086 OOP_RD_DELIM_STRIP, '\n',
1088 OOP_RD_SHORTREC_FORBID
1091 static void *peer_rd_err(oop_source *lp, oop_read *oread, oop_event ev,
1092 const char *errmsg, int errnoval,
1093 const char *data, size_t recsz, void *conn_v) {
1095 connfail(conn, "error receiving from peer: %s", errmsg);
1096 return OOP_CONTINUE;
1099 static Article *article_reply_check(Conn *conn, const char *response,
1100 int code_indicates_streaming,
1102 /* 1:yes, -1:no, 0:dontcare */,
1103 const char *sanitised_response) {
1104 Article *art= LIST_HEAD(conn->sent);
1108 "peer gave unexpected response when no commands outstanding: %s",
1109 sanitised_response);
1113 if (code_indicates_streaming) {
1114 assert(!memchr(response, 0, 4)); /* ensured by peer_rd_ok */
1115 if (!conn->stream) {
1116 connfail(conn, "peer gave streaming response code "
1117 " to IHAVE or subsequent body: %s", sanitised_response);
1120 const char *got_mid= response+4;
1121 int got_midlen= strcspn(got_mid, " \n\r");
1122 if (got_midlen<3 || got_mid[0]!='<' || got_mid[got_midlen-1]!='>') {
1123 connfail(conn, "peer gave streaming response with syntactically invalid"
1124 " messageid: %s", sanitised_response);
1127 if (got_midlen != art->midlen ||
1128 memcmp(got_mid, art->messageid, got_midlen)) {
1129 connfail(conn, "peer gave streaming response code to wrong article -"
1130 " probable synchronisation problem; we offered: %s;"
1132 art->messageid, sanitised_response);
1137 connfail(conn, "peer gave non-streaming response code to"
1138 " CHECK/TAKETHIS: %s", sanitised_response);
1143 if (must_have_sent>0 && art->state < art_Wanted) {
1144 connfail(conn, "peer says article accepted but"
1145 " we had not sent the body: %s", sanitised_response);
1148 if (must_have_sent<0 && art->state >= art_Wanted) {
1149 connfail(conn, "peer says please sent the article but we just did: %s",
1150 sanitised_response);
1154 Article *art_again= LIST_REMHEAD(conn->sent);
1155 assert(art_again == art);
1159 static void update_nocheck(int accepted) {
1160 accept_proportion *= nocheck_decay;
1161 accept_proportion += accepted * (1.0 - nocheck_decay);
1162 int new_nocheck= accept_proportion >= nocheck_thresh;
1163 if (new_nocheck && !nocheck_reported) {
1164 notice("entering nocheck mode for the first time");
1165 nocheck_reported= 1;
1166 } else if (new_nocheck != nocheck) {
1167 debug("nocheck mode %s", new_nocheck ? "start" : "stop");
1169 nocheck= new_nocheck;
1172 static void article_done(Conn *conn, Article *art, int whichcount) {
1173 art->ipf->counts[art->state][whichcount]++;
1174 if (whichcount == RC_accepted) update_nocheck(1);
1175 else if (whichcount == RC_unwanted) update_nocheck(0);
1177 InputFile *ipf= art->ipf;
1178 while (art->blanklen) {
1179 static const char spaces[]=
1184 int w= art->blanklen; if (w >= sizeof(spaces)) w= sizeof(spaces)-1;
1185 int r= pwrite(ipf->fd, spaces, w, art->offset);
1187 if (errno==EINTR) continue;
1188 sysdie("failed to blank entry for %s (length %d at offset %lu) in %s",
1189 art->messageid, art->blanklen, art->offset, ipf->path);
1191 assert(r>=0 && r<=w);
1197 assert(ipf->inprogress >= 0);
1199 if (!ipf->inprogress && ipf != main_input_file)
1200 queue_check_input_done();
1205 static void *peer_rd_ok(oop_source *lp, oop_read *oread, oop_event ev,
1206 const char *errmsg, int errnoval,
1207 const char *data, size_t recsz, void *conn_v) {
1210 if (ev == OOP_RD_EOF) {
1211 connfail(conn, "unexpected EOF from peer");
1212 return OOP_CONTINUE;
1214 assert(ev == OOP_RD_OK);
1216 char *sani= sanitise(data);
1219 unsigned long code= strtoul(data, &ep, 10);
1220 if (ep != data+3 || *ep != ' ' || data[0]=='0') {
1221 connfail(conn, "badly formatted response from peer: %s", sani);
1222 return OOP_CONTINUE;
1225 if (conn->quitting) {
1226 if (code!=205 && code!=503) {
1227 connfail(conn, "peer gave unexpected response to QUIT: %s", sani);
1229 notice("#%d idle connection closed\n");
1230 assert(!conn->waiting.count);
1231 assert(!conn->priority.count);
1232 assert(!conn->sent.count);
1233 assert(!conn->xmitu);
1234 LIST_REMOVE(conns,conn);
1237 return OOP_CONTINUE;
1242 #define GET_ARTICLE(musthavesent) \
1243 art= article_reply_check(conn, data, musthavesent, code_streaming, sani); \
1244 if (art) ; else return OOP_CONTINUE /* reply_check has failed the conn */
1246 #define ARTICLE_DEALTWITH(streaming,musthavesent,how) \
1247 code_streaming= (streaming); \
1248 GET_ARTICLE(musthavesent); \
1249 article_done(conn, art, RC_##how); break;
1251 #define PEERBADMSG(m) connfail(conn, m ": %s", sani); return OOP_CONTINUE
1253 int code_streaming= 0;
1257 case 400: PEERBADMSG("peer stopped accepting articles");
1258 case 503: PEERBADMSG("peer timed us out");
1259 default: PEERBADMSG("peer sent unexpected message");
1261 case 435: ARTICLE_DEALTWITH(0,0,unwanted); /* IHAVE says they have it */
1262 case 438: ARTICLE_DEALTWITH(1,0,unwanted); /* CHECK/TAKETHIS: they have it */
1264 case 235: ARTICLE_DEALTWITH(0,1,accepted); /* IHAVE says thanks */
1265 case 239: ARTICLE_DEALTWITH(1,1,accepted); /* TAKETHIS says thanks */
1267 case 437: ARTICLE_DEALTWITH(0,0,rejected); /* IHAVE says rejected */
1268 case 439: ARTICLE_DEALTWITH(1,0,rejected); /* TAKETHIS says rejected */
1270 case 238: /* CHECK says send it */
1272 case 335: /* IHAVE says send it */
1274 assert(art->state == art_Unchecked);
1275 art->ipf->counts[art->state][RC_accepted]++;
1276 art->state= art_Wanted;
1277 LIST_ADDTAIL(conn->priority, art);
1280 case 431: /* CHECK or TAKETHIS says try later */
1282 case 436: /* IHAVE says try later */
1285 if (fprintf(defer, "%s %s\n", TokenToText(art->token), art->messageid) <0
1287 sysfatal("write to defer file %s",path_defer);
1288 article_done(conn, art, RC_deferred);
1293 conn_maybe_write(conn);
1294 check_master_queue();
1295 return OOP_CONTINUE;
1299 /*========== monitoring of input files ==========*/
1301 static void feedfile_eof(InputFile *ipf) {
1302 assert(ipf != main_input_file); /* promised by tailing_try_read */
1304 inputfile_tailing_stop(ipf);
1305 assert(ipf->fd >= 0);
1306 if (close(ipf->fd)) sysdie("could not close input file %s", ipf->path);
1309 if (ipf == flushing_input_file) {
1310 assert(sms==sm_SEPARATED || sms==sm_DROPPING);
1311 if (main_input_file) inputfile_tailing_start(main_input_file);
1312 statemc_check_flushing_done();
1313 } else if (ipf == backlog_input_file) {
1314 statemc_check_backlog_done();
1316 abort(); /* supposed to wait rather than get EOF on main input file */
1320 static InputFile *open_input_file(const char *path) {
1321 int fd= open(path, O_RDONLY);
1323 if (errno==ENOENT) return 0;
1324 sysfatal("unable to open input file %s", path);
1327 InputFile *ipf= xmalloc(sizeof(*ipf) + strlen(path) + 1);
1328 memset(ipf,0,sizeof(*ipf));
1331 strcpy(ipf->path, path);
1336 static void close_input_file(InputFile *ipf) {
1337 assert(!ipf->readable_callback); /* must have had ->on_cancel */
1338 assert(!ipf->filemon); /* must have had inputfile_tailing_stop */
1339 assert(!ipf->rd); /* must have had inputfile_tailing_stop */
1340 assert(!ipf->inprogress); /* no dangling pointers pointing here */
1343 if (close(ipf->fd)) sysdie("could not close input file %s", ipf->path);
1347 /*---------- dealing with articles read in the input file ----------*/
1349 void *feedfile_got_article(oop_source *lp, oop_read *rd,
1350 oop_rd_event ev, const char *errmsg,
1351 int errnoval, const char *data, size_t recsz,
1353 InputFile *ipf= ipf_v;
1355 char tokentextbuf[sizeof(TOKEN)*2+3];
1357 if (!data) { feedfile_eof(ipf); return OOP_CONTINUE; }
1359 if (data[0] && data[0]!=' ') {
1360 char *space= strchr(data,' ');
1361 int tokenlen= space-data;
1362 int midlen= (int)recsz-tokenlen-1;
1363 if (midlen < 0) goto bad_data;
1365 if (tokenlen != sizeof(TOKEN)*2+2) goto bad_data;
1366 memcpy(tokentextbuf, data, tokenlen);
1367 tokentextbuf[tokenlen]= 0;
1368 if (!IsToken(tokentextbuf)) goto bad_data;
1370 art= xmalloc(sizeof(*art) - 1 + midlen + 1);
1371 art->offset= ipf->offset;
1372 art->blanklen= recsz;
1373 art->midlen= midlen;
1374 art->state= art_Unchecked;
1375 art->ipf= ipf; ipf->inprogress++;
1376 art->token= TextToToken(tokentextbuf);
1377 strcpy(art->messageid, space+1);
1378 LIST_ADDTAIL(queue, art);
1380 ipf->offset += recsz + 1;
1382 if (sms==sm_NORMAL && ipf==main_input_file &&
1383 ipf->offset >= target_max_feedfile_size)
1384 statemc_start_flush("feed file size");
1386 check_master_queue();
1389 /*========== tailing input file ==========*/
1391 static void filemon_start(InputFile *ipf) {
1392 assert(!ipf->filemon);
1394 ipf->filemon= xmalloc(sizeof(*ipf->filemon));
1395 memset(ipf->filemon, 0, sizeof(*ipf->filemon));
1396 filemon_method_startfile(ipf, ipf->filemon);
1399 static void filemon_stop(InputFile *ipf) {
1400 if (!ipf->filemon) return;
1401 filemon_method_stopfile(ipf, ipf->filemon);
1406 static void filemon_callback(InputFile *ipf) {
1407 ipf->readable_callback(ipf->readable_callback_user);
1410 static void *tailing_rable_call_time(oop_source *loop, struct timeval tv,
1412 InputFile *ipf= user;
1413 return ipf->readable_callback(ipf->readable_callback_user);
1416 static void on_cancel(struct oop_readable *rable) {
1417 InputFile *ipf= (void*)rable;
1419 if (ipf->filemon) filemon_stopfile(ipf);
1420 loop->cancel_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
1421 ipf->readable_callback= 0;
1424 static void tailing_queue_readable(InputFile *ipf) {
1425 /* lifetime of ipf here is OK because destruction will cause
1426 * on_cancel which will cancel this callback */
1427 loop->on_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
1430 static int tailing_on_readable(struct oop_readable *rable,
1431 oop_readable_call *cb, void *user) {
1432 InputFile *ipf= (void*)rable;
1434 tailing_on_cancel(rable);
1435 ipf->readable_callback= cb;
1436 ipf->readable_callback_user= user;
1437 filemon_startfile(ipf);
1439 tailing_queue_readable(ipf);
1443 static ssize_t tailing_try_read(struct oop_readable *rable, void *buffer,
1445 InputFile *ipf= (void*)rable;
1447 ssize_t r= read(ipf->fd, buffer, length);
1449 if (errno==EINTR) continue;
1453 if (ipf==main_input_file) {
1456 } else if (ipf==flushing_input_file) {
1458 assert(sms==sm_SEPARATED || sms==sm_DROPPING);
1459 } else if (ipf==backlog_input_file) {
1469 /*---------- filemon implemented with inotify ----------*/
1471 #if defined(HAVE_INOTIFY) && !defined(HAVE_FILEMON)
1472 #define HAVE_FILEMON
1474 #include <linux/inotify.h>
1476 static int filemon_inotify_fd;
1477 static int filemon_inotify_wdmax;
1478 static InputFile **filemon_inotify_wd2ipf;
1480 typedef struct Filemon_Perfile {
1482 } Filemon_Inotify_Perfile;
1484 static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) {
1485 int wd= inotify_add_watch(filemon_inotify_fd, ipf->path, IN_MODIFY);
1486 if (wd < 0) sysdie("inotify_add_watch %s", ipf->path);
1488 if (wd >= filemon_inotify_wdmax) {
1490 filemon_inotify_wd= xrealloc(filemon_inotify_wd2ipf,
1491 sizeof(*filemon_inotify_wd2ipf) * newmax);
1492 memset(filemon_inotify_wd2ipf + filemon_inotify_wdmax, 0,
1493 sizeof(*filemon_inotify_wd2ipf) * (newmax - filemon_inotify_wdmax));
1494 filemon_inotify_wdmax= newmax;
1497 assert(!filemon_inotify_wd2ipf[wd]);
1498 filemon_inotify_wd2ipf[wd]= ipf;
1500 debug("filemon inotify startfile %p wd=%d wdmax=%d",
1501 ipf, wd, filemon_inotify_wdmax);
1506 static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) {
1508 debug("filemon inotify stopfile %p wd=%d", ipf, wd);
1509 int r= inotify_rm_watch(filemon_inotify_fd, filemon_inotify_wd);
1510 if (r) sysdie("inotify_rm_watch");
1511 filemon_inotify_wd2ipf[wd]= 0;
1514 static void *filemon_inotify_readable(oop_source *lp, int fd,
1515 oop_event e, void *u) {
1516 struct inotify_event iev;
1518 int r= read(filemon_inotify_fd, &iev, sizeof(iev));
1520 if (errno==EAGAIN) break;
1521 sysdie("read from inotify master");
1522 } else if (r==sizeof(iev)) {
1523 assert(iev.wd >= 0 && iev.wd < filemon_inotify_wdmax);
1525 die("inotify read %d bytes wanted struct of %d", r, (int)sizeof(iev));
1527 InputFile *ipf= filemon_inotify_wd2ipf[iev.wd];
1528 debug("filemon inotify readable read %p wd=%p", iev.wd, ipf);
1529 filemon_callback(ipf);
1531 return OOP_CONTINUE;
1534 static int filemon_method_init(void) {
1535 filemon_inotify_fd= inotify_init();
1536 if (filemon_inotify_fd<0) {
1537 syswarn("could not initialise inotify: inotify_init failed");
1541 loop->on_fd(loop, filemon_inotify_fd, OOP_READ, filemon_inotify_readable);
1543 debug("filemon inotify init filemon_inotify_fd=%d", filemon_inotify_fd);
1547 #endif /* HAVE_INOTIFY && !HAVE_FILEMON *//
1549 /*---------- filemon dummy implementation ----------*/
1551 #if !defined(HAVE_FILEMON)
1553 typedef struct Filemon_Perfile { int dummy; } Filemon_Dummy_Perfile;
1555 static int filemon_method_init(void) { return 0; }
1556 static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) { }
1557 static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) { }
1559 #endif /* !HAVE_FILEMON */
1561 /*---------- interface to start and stop an input file ----------*/
1563 static const oop_rd_style feedfile_rdstyle= {
1564 OOP_RD_DELIM_STRIP, '\n',
1566 OOP_RD_SHORTREC_EOF,
1569 static void inputfile_tailing_start(InputFile *ipf) {
1571 ipf->readable->on_readable= tailing_on_readable;
1572 ipf->readable->on_cancel= tailing_on_cancel;
1573 ipf->readable->try_read= tailing_try_read;
1574 ipf->readable->delete_tidy= 0; /* we never call oop_rd_delete_{tidy,kill} */
1575 ipf->readable->delete_kill= 0;
1577 ipf->readable_callback= 0;
1578 ipf->readable_callback_user= 0;
1580 ipf->rd= oop_rd_new(loop, &ipf->readable, 0,0);
1583 int r= oop_rd_read(ipf->rd, &feedfile_rdstyle, MAX_LINE_FEEDFILE,
1584 feedfile_got_article,ipf, feedfile_problem,ipf);
1585 if (r) sysdie("unable start reading feedfile %s",ipf->path);
1588 static void inputfile_tailing_stop(InputFile *ipf) {
1590 oop_rd_cancel(ipf->rd);
1591 oop_rd_delete(ipf->rd);
1593 assert(!ipf->filemon); /* we shouldn't be monitoring it now */
1597 /*========== interaction with innd - state machine ==========*/
1599 /* See official state diagram at top of file. We implement
1610 |`---------------------------------------------------.
1612 |`---------------- - - - |
1613 D ENOENT | D EXISTS see OVERALL STATES diagram |
1614 | for full startup logic |
1617 | ============ try to |
1623 | | F IS SO BIG WE SHOULD FLUSH, OR TIMEOUT |
1624 ^ | hardlink F to D |
1627 | | our handle onto F is now onto D |
1630 | |<-------------------<---------------------<---------+
1632 | | spawn inndcomm flush |
1634 | ================== |
1635 | FLUSHING[-ABSENT] |
1637 | main D tail/none |
1638 | ================== |
1640 | | INNDCOMM FLUSH FAILS ^
1641 | |`----------------------->----------. |
1643 | | NO SUCH SITE V |
1644 ^ |`--------------->----. ==================== |
1645 | | \ FLUSHFAILED[-ABSENT] |
1647 | | FLUSH OK \ main D tail/none |
1648 | | open F \ ==================== |
1650 | | \ | TIME TO RETRY |
1651 | |`------->----. ,---<---'\ `----------------'
1652 | | D NONE | | D NONE `----.
1654 | ============= V V ============
1655 | SEPARATED-1 | | DROPPING-1
1656 | flsh->fd>=0 | | flsh->fd>=0
1657 | [Separated] | | [Dropping]
1658 | main F idle | | main none
1659 | old D tail | | old D tail
1660 | ============= | | ============
1662 ^ | EOF ON D | | defer | EOF ON D
1664 | =============== | | ===============
1665 | SEPARATED-2 | | DROPPING-2
1666 | flsh->fd==-1 | V flsh->fd==-1
1667 | [Finishing] | | [Dropping]
1668 | main F tail | `. main none
1669 | old D closed | `. old D closed
1670 | =============== V `. ===============
1672 | | ALL D PROCESSED `. | ALL D PROCESSED
1673 | V install defer as backlog `. | install defer
1674 ^ | close D `. | close D
1675 | | unlink D `. | unlink D
1678 `----------' ==============
1698 static void statemc_init(void) {
1699 struct stat stab, stabf;
1701 path_lock= xasprintf("%s_lock", feedfile);
1702 path_flushing= xasprintf("%s_flushing", feedfile);
1703 path_defer= xasprintf("%s_defer", feedfile);
1704 globpat_backlog= xasprintf("%s_backlog*", feedfile);
1707 int lockfd= open(path_lock, O_CREAT|O_RDWR, 0600);
1708 if (lockfd<0) sysfatal("open lockfile %s", path_lock);
1711 memset(&fl,0,sizeof(fl));
1713 fl.l_whence= SEEK_SET;
1714 r= fcntl(lockfd, F_SETLK, &fl);
1716 if (errno==EACCES || errno==EAGAIN) {
1717 if (quiet_multiple) exit(0);
1718 fatal("another duct holds the lockfile");
1720 sysdie("fcntl F_SETLK lockfile %s", path_lock);
1723 xfstat_isreg(lockfd, &stabf, "lockfile");
1725 xlstat_isreg(path_lock, &stab, &lock_noent, "lockfile");
1727 if (!lock_noent && samefile(&stab, &stabf))
1731 sysdie("could not close stale lockfile %s", path_lock);
1733 debug("startup: locked");
1735 search_backlog_file();
1738 xlstat_isreg(path_defer, &stab, &defer_noent, "defer file");
1740 debug("startup: ductdefer ENOENT");
1742 debug("startup: ductdefer nlink=%ld", (long)stab.st_nlink);
1743 switch (stab.st_nlink==1) {
1745 open_defer(); /* so that we will later close it and rename it */
1748 xunlink(path_defer, "stale defer file link"
1749 " (presumably hardlink to backlog file)");
1752 die("defer file %s has unexpected link count %d",
1753 path_defer, stab.st_nlink);
1757 struct stat stab_f, stab_d;
1760 InputFile *file_d= open_input_file(path_flushing);
1761 if (file_d) xfstat_isreg(file_d->fd, &stab_d, "flushing file");
1763 xlstat_isreg(feedfile, &stab_f, &noent_f, "feedfile");
1765 if (!noent_f && file_d && samefile(&stab_f, &stab_d)) {
1766 debug("startup: F==D => Hardlinked");
1767 xunlink(feedfile, "feed file (during startup)"); /* => Moved */
1772 debug("startup: F ENOENT => Moved");
1773 if (file_d) startup_set_input_file(file_d);
1774 spawn_inndcomm_flush("feedfile missing at startup");
1775 /* => Flushing, sms:=FLUSHING */
1778 debug("startup: F!=D => Separated");
1779 startup_set_input_file(file_d);
1780 SMS(SEPARATED, 0, "found both old and current feed files");
1782 debug("startup: F exists, D ENOENT => Normal");
1783 FILE *file_f= open_input_file(feedfile);
1784 if (!file_f) die("feed file vanished during startup");
1785 startup_set_input_file(file_f);
1786 SMS(NORMAL, flushfail_retry_periods, "normal startup");
1791 static void statemc_start_flush(const char *why) { /* Normal => Flushing */
1792 assert(sms == sm_NORMAL);
1794 debug("starting flush (%s) (%lu >= %lu) (%d)",
1796 (unsigned long)ipf->offset, (unsigned long)flush_threshold,
1799 int r= link(feedfile, duct_path);
1800 if (r) sysdie("link feedfile %s to flushing file %s", feedfile,
1804 xunlink(feedfile, "old feedfile link");
1807 spawn_inndcomm_flush(why); /* => Flushing FLUSHING */
1810 static void statemc_period_poll(void) {
1811 if (!sm_period_counter) return;
1812 sm_period_counter--;
1813 assert(sm_period_counter>=0);
1815 if (sm_period_counter) return;
1818 statemc_start_flush("periodic"); /* Normal => Flushing; => FLUSHING */
1820 case sm_FLUSHFAILED:
1821 spawn_inndcomm_flush("retry"); /* Moved => Flushing; => FLUSHING */
1828 static void startup_set_input_file(InputFile *f) {
1829 assert(!main_input_file);
1831 inputfile_tailing_start(f);
1834 static int inputfile_is_done(InputFile *ipf) {
1836 if (ipf->inprogress) return 0; /* new article in the meantime */
1837 if (ipf->fd >= 0); return 0; /* not had EOF */
1841 static void notice_processed(InputFile *ipf, const char *what,
1843 #define RCI_NOTHING(x) /* nothing */
1844 #define RCI_TRIPLE_FMT(x) " " #x "=" RCI_TRIPLE_FMT_BASE
1845 #define RCI_TRIPLE_VALS(x) , RCI_TRIPLE_VALS_BASE(ipf->counts, .x)
1847 info("processed %s%s offered=%d(ch%d,nc%d) accepted=%d(ch%d+nc%d)"
1848 RESULT_COUNTS(RCI_NOTHING, RCI_TRIPLE_FMT)
1851 ipf->counts[art_Unchecked].sent + ipf->counts[art_Unsolicited].sent
1852 , ipf->counts[art_Unchecked].sent, ipf->counts[art_Unsolicited].sent,
1853 ipf->counts[art_Wanted].accepted + ipf->counts[art_Unsolicited].accepted
1854 ,ipf->counts[art_Wanted].accepted,ipf->counts[art_Unsolicited].accepted
1855 RESULT_COUNTS(RCI_NOTHING, RCI_TRIPLE_VALS)
1859 static void statemc_check_backlog_done(void) {
1860 InputFile *ipf= backlog_input_file();
1861 if (!inputfile_is_done(ipf)) return;
1863 const char *slash= strrchr(ipf->path, "/");
1864 const char *leaf= slash ? slash+1 : ipf->path;
1865 const char *under= strchr(slash, "_");
1866 const char *rest= under ? under+1 : leaf;
1867 if (!strncmp(rest,"backlog",7)) rest += 7;
1868 notice_processed(ipf,"backlog:",rest);
1870 close_input_file(ipf);
1871 if (unlink(ipf->path)) {
1872 if (errno != ENOENT)
1873 sysdie("could not unlink processed backlog file %s", ipf->path);
1874 warn("backlog file %s vanished while we were reading it"
1875 " so we couldn't remove it (but it's done now, anyway)",
1879 backlog_input_file= 0;
1880 search_backlog_file();
1884 static void statemc_check_flushing_done(void) {
1885 InputFile *ipf= flushing_input_file;
1886 if (!inputfile_is_done(ipf)) return;
1888 assert(sms==sm_SEPARATED || sms==sm_DROPPING);
1890 notice_processed(ipf,"feedfile",0);
1894 xunlink(path_flushing, "old flushing file");
1896 close_input_file(flushing_input_file);
1897 free(flushing_input_file);
1898 flushing_input_file= 0;
1900 if (sms==sm_SEPARATED) {
1901 notice("flush complete");
1902 SMS(NORMAL, 0, "flush complete");
1903 } else if (sms==sm_DROPPING) {
1904 SMS(DROPPED, 0, "old flush complete");
1905 search_backlog_file();
1906 notice("feed dropped, but will continue until backlog is finished");
1910 static void *statemc_check_input_done(oop_source *lp, struct timeval now,
1912 assert(!inputfile_is_done(main_input_file));
1913 statemc_check_flushing_done();
1914 statemc_check_backlog_done();
1915 return OOP_CONTINUE;
1918 static void queue_check_input_done(void) {
1919 loop->on_time(loop, OOP_TIME_NOW, statemc_check_input_done, 0);
1922 static void statemc_setstate(StateMachineState newsms, int periods,
1923 const char *forlog, const char *why) {
1925 sm_period_counter= periods;
1927 const char *xtra= "";
1929 case sm_FLUSHING: sm_FLUSHFAILED:
1930 if (!main_input_file) xtra= "-ABSENT";
1932 case sm_SEPARATED: case sm_DROPPING:
1933 xtra= flushing_input_file->fd >= 0 ? "-1" : "-2";
1939 info("%s%s[%d] %s",forlog,xtra,periods,why);
1941 info("%s%s %s",forlog,xtra,why);
1945 /*---------- defer and backlog files ----------*/
1947 static void open_defer(void) {
1952 defer= fopen(path_defer, "a+");
1953 if (!defer) sysfatal("could not open defer file %s", path_defer);
1955 /* truncate away any half-written records */
1957 xfstat_isreg(fileno(defer), &stab, "newly opened defer file");
1959 if (stab.st_size > LONG_MAX)
1960 die("defer file %s size is far too large", path_defer);
1965 long orgsize= stab.st_size;
1966 long truncto= stab.st_size;
1968 if (!truncto) break; /* was only (if anything) one half-truncated record */
1969 if (fseek(defer, truncto-1, SEEK_SET) < 0)
1970 sysdie("seek in defer file %s while truncating partial", path_defer);
1975 sysdie("failed read from defer file %s", path_defer);
1977 die("defer file %s shrank while we were checking it!", path_defer);
1983 if (stab.st_size != truncto) {
1984 warn("truncating half-record at end of defer file %s -"
1985 " shrinking by %ld bytes from %ld to %ld",
1986 path_defer, orgsize - truncto, orgsize, truncto);
1989 sysfatal("could not flush defer file %s", path_defer);
1990 if (ftruncate(fileno(defer), truncto))
1991 sysdie("could not truncate defer file %s", path_defer);
1994 info("continuing existing defer file %s (%ld bytes)",
1995 path_defer, orgsize);
1997 if (fseek(defer, truncto, SEEK_SET))
1998 sysdie("could not seek to new end of defer file %s", path_defer);
2001 static void close_defer(void) {
2005 xfstat(fileno(defer), &stab, "defer file");
2007 if (fclose(defer)) sysfatal("could not close defer file %s", path_defer);
2010 char *backlog= xasprintf("%s_backlog_%lu.%lu", feedfile,
2011 (unsigned long)now.tv_sec,
2012 (unsigned long)stab.st_ino);
2013 if (link(path_defer, path_backlog))
2014 sysfatal("could not install defer file %s as backlog file %s",
2015 path_defer, backlog);
2016 if (unlink(path_defer))
2017 sysdie("could not unlink old defer link %s to backlog file %s",
2018 path_defer, backlog);
2020 if (until_backlog_nextscan < 0 ||
2021 until_backlog_nextscan > backlog_retry_minperiods + 1)
2022 until_backlog_nextscan= backlog_retry_minperiods + 1;
2025 static void poll_backlog_file(void) {
2026 if (until_backlog_nextscan < 0) return;
2027 if (until_backlog_nextscan-- > 0) return;
2028 search_backlog_file();
2031 static void search_backlog_file(void) {
2032 /* returns non-0 iff there are any backlog files */
2037 const char *oldest_path=0;
2038 time_t oldest_mtime, now;
2040 if (backlog_input_file) return 3;
2044 r= glob(globpat_backlog, GLOB_ERR|GLOB_MARK|GLOB_NOSORT, 0, &gl);
2048 sysdie("failed to expand backlog pattern %s", globpat_backlog);
2050 die("out of memory expanding backlog pattern %s", globpat_backlog);
2052 for (i=0; i<gl.gl_pathc; i++) {
2053 const char *path= gl.gl_pathv[i];
2055 if (strchr(path,'#') || strchr(path,'~')) {
2056 debug("backlog file search skipping %s", path);
2059 r= stat(path, &stab);
2061 syswarn("failed to stat backlog file %s", path);
2064 if (!S_ISREG(stab.st_mode)) {
2065 warn("backlog file %s is not a plain file (or link to one)", path);
2068 if (!oldest_path || stab.st_mtime < oldest_mtime) {
2070 oldest_mtime= stab.st_mtime;
2073 case GLOB_NOMATCH: /* fall through */
2076 sysdie("glob expansion of backlog pattern %s gave unexpected"
2077 " nonzero (error?) return value %d", globpat_backlog, r);
2083 debug("backlog scan: none");
2085 if (sms==sm_DROPPED) {
2086 notice("feed dropped and our work is complete");
2087 xunlink(path_lock, "lockfile for old feed");
2090 until_backlog_nextscan= backlog_spontaneous_rescan_periods;
2094 now= time(); if (now==-1) sysdie("time(2) failed");
2095 double age= difftime(now, oldest_mtime);
2096 long age_deficiency= (backlog_retry_minperiods * PERIOD_SECONDS) - age;
2098 if (age_deficiency <= 0) {
2099 debug("backlog scan: found age=%f deficiency=%ld oldest=%s",
2100 age, age_deficiency, oldest_path);
2102 backlog_input_file= open_input_file(oldest_path);
2103 if (!backlog_input_file) {
2104 warn("backlog file %s vanished as we opened it", backlog_input_file);
2107 inputfile_tailing_start(backlog_input_file);
2108 until_backlog_nextscan= -1;
2112 until_backlog_nextscan= age_deficiency / PERIOD_SECONDS;
2114 if (backlog_spontaneous_rescan_periods >= 0 &&
2115 until_backlog_nextscan > backlog_spontaneous_rescan_periods)
2116 until_backlog_nextscan= backlog_spontaneous_rescan_periods;
2118 debug("backlog scan: young age=%f deficiency=%ld nextscan=%d oldest=%s",
2119 age, age_deficiency, until_backlog_nextscan, oldest_path);
2123 /*========== flushing the feed ==========*/
2125 static pid_t inndcomm_child;
2127 static void *inndcomm_event(oop_source *lp, int fd, oop_event e, void *u) {
2128 assert(inndcomm_child);
2129 int status= xwaitpid(&inndcomm_child, "inndcomm");
2130 loop->cancel_fd(fd);
2133 assert(!flushing_input_file);
2135 if (WIFEXITED(status)) {
2136 switch (WEXITSTATUS(status)) {
2138 case INNDCOMMCHILD_ESTATUS_FAIL:
2141 case INNDCOMMCHILD_ESTATUS_NONESUCH:
2142 warn("feed has been dropped by innd, finishing up");
2143 flushing_input_file= main_input_file;
2144 tailing_queue_readable(flushing_input_file);
2145 /* we probably previously returned EAGAIN from our fake read method
2146 * when in fact we were at EOF, so signal another readable event
2147 * so we actually see the EOF */
2151 if (flushing_input_file) {
2152 SMS(DROPPING, 0, "feed dropped by innd, but must finish last flush");
2155 SMS(DROPPED, 0, "feed dropped by innd");
2156 search_backlog_file();
2158 return OOP_CONTINUE;
2162 flushing_input_file= main_input_file;
2163 tailing_queue_readable(flushing_input_file);
2165 main_input_file= open_input_file(feedfile);
2166 if (!main_input_file)
2167 die("flush succeeded but feedfile %s does not exist!", feedfile);
2169 if (flushing_input_file) {
2170 SMS(SEPARATED, spontaneous_flush_periods, "recovery flush complete");
2173 SMS(NORMAL, spontaneous_flush_periods, "flush complete");
2175 return OOP_CONTINUE;
2178 goto unexpected_exitstatus;
2181 } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALRM) {
2182 warn("flush timed out trying to talk to innd");
2185 unexpected_exitstatus:
2186 report_child_status("inndcomm child", status);
2190 SMS(FLUSHFAILED, flushfail_retry_periods, "flush failed, will retry");
2193 static void inndcommfail(const char *what) {
2194 syswarn("error communicating with innd: %s failed: %s", what, ICCfailure);
2195 exit(INNDCOMMCHILD_ESTATUS_FAIL);
2198 void spawn_inndcomm_flush(const char *why) { /* Moved => Flushing */
2201 notice("flushing %s",why);
2203 assert(sms==sm_NORMAL || sms==sm_FLUSHFAILED);
2204 assert(!inndcomm_child);
2206 if (pipe(pipefds)) sysdie("create pipe for inndcomm child sentinel");
2208 inndcomm_child= xfork();
2210 if (!inndcomm_child) {
2211 static char flushargv[2]= { sitename, 0 };
2216 alarm(inndcomm_flush_timeout);
2217 r= ICCopen(); if (r) inndcommfail("connect");
2218 r= ICCcommand('f',flushargv,&reply); if (r<0) inndcommfail("transmit");
2219 if (!r) exit(0); /* yay! */
2221 if (!strcmp(reply, "1 No such site")) exit(INNDCOMMCHILD_ESTATUS_NONESUCH);
2222 syswarn("innd ctlinnd flush failed: innd said %s", reply);
2223 exit(INNDCOMMCHILD_ESTATUS_FAIL);
2227 int sentinel_fd= pipefds[0];
2228 on_fd_read_except(sentinel_fd, inndcomm_event);
2230 SMS(FLUSHING, 0, why);
2233 /*========== main program ==========*/
2235 static void postfork_inputfile(InputFile *ipf) {
2237 assert(ipf->fd >= 0);
2242 static void postfork_stdio(FILE *f) {
2243 /* we have no stdio streams that are buffered long-term */
2247 static void postfork(const char *what) {
2248 if (signal(SIGPIPE, SIG_DFL) == SIG_ERR)
2249 sysdie("%s child: failed to reset SIGPIPE");
2251 postfork_inputfile(main_input_file);
2252 postfork_inputfile(flushing_input_file);
2255 for (conn=LIST_HEAD(conns); conn; conn=LIST_NEXT(conn))
2258 postfork_stdio(defer);
2261 #define EVERY(what, interval, body) \
2262 static const struct timeval what##_timeout = { 5, 0 }; \
2263 static void what##_schedule(void); \
2264 static void *what##_timedout(oop_source *lp, struct timeval tv, void *u) { \
2266 what##_schedule(); \
2268 static void what##_schedule(void) { \
2269 loop->on_time(loop, what##_timeout, what##_timedout, 0); \
2272 EVERY(filepoll, {5,0}, {
2273 if (main_input_file && main_input_file->readable_callback)
2274 filemon_callback(main_input_file);
2277 #define DEBUGF_IPF(wh) " " #wh "=%p/%s:ip=%ld,off=%ld,fd=%d%s" \
2278 #define DEBUG_IPF(sh) \
2279 wh##_input_file, debug_ipf_path(wh##_input_file), \
2280 wh##_input_file->inprogress, (long)wh##_input_file->offset, \
2281 wh##_input_file->fd, wh##_input_file->rd ? "+" : ""
2282 static const char *debug_ipf_path(InputFile *ipf) {
2283 char *slash= strrchr(ipf->path,'/');
2284 return slash ? slash+1 : ipf->path;
2287 EVERY(period, {PERIOD_SECONDS,0}, {
2289 " sms=%s[%d] conns=%d queue=%d until_connect=%d"
2290 " input_files" DEBUGF_IPF(main) DEBUGF_IPF(old) DEBUGF_FMT(flushing)
2291 " children connecting=%ld inndcomm_child"
2293 sms_names[sms], sm_period_counter,
2294 queue.count, conns.count, until_connect,
2295 DEBUG_IPF(main), DEBUG_IPF(flushing), DEBUG_IPF(flushing),
2296 (long)connecting_child, (long)inndcomm_child
2299 if (until_connect) until_connect--;
2301 poll_backlog_file();
2302 if (!backlog_input_file) close_defer(); /* want to start on a new backlog */
2303 statemc_period_poll();
2304 check_master_queue();
2308 /*========== option parsing ==========*/
2311 of_seconds= 001000u;
2312 of_boolean= 002000u;
2315 typedef struct Option Option;
2316 typedef void OptionParser(const Option*, const char *val);
2326 void op_integer(const Option *o, const char *val) {
2329 unsigned long ul= strtoul(val,&ep,10);
2330 if (*ep || ep==val || errno || ul>INT_MAX)
2331 badusage("bad integer value for %s",o->long);
2332 int *store= o->store;
2336 void op_double(const Option *o, const char *val) {
2337 int *store= o->store;
2340 *store= strtod(val, &ep);
2341 if (*ep || ep==val || errno)
2342 badusage("bad floating point value for %s",o->long);
2345 void op_string(const Option *o, const char *val) {
2346 char **store= o->store;
2351 void op_seconds(const Option *o, const char *val) {
2352 int *store= o->store;
2355 double v= strtod(val,&ep);
2356 if (ep==val) badusage("bad time/duration value for %s",o->long);
2358 if (!*ep || !strcmp(ep,"s")) unit= 1;
2359 else if (!strcmp(ep,"m")) unit= 60;
2360 else if (!strcmp(ep,"h")) unit= 3600;
2361 else if (!strcmp(ep,"d")) unit= 86400;
2362 else badusage("bad units %s for time/duration value for %s",ep,o->long);
2366 if (v > INT_MAX) badusage("time/duration value for %s out of range",o->long);
2370 void op_periods_rndup(const Option *o, const char *val) {
2371 int *store= o->store;
2373 *store += PERIOD_SECONDS-1;
2374 *store /= PERIOD_SECONDS;
2377 void op_periods_booltrue(const Option *o, const char *val) {
2378 int *store= o->store;
2381 void op_periods_boolfalse(const Option *o, const char *val) {
2382 int *store= o->store;
2386 static const Option options[]= {
2387 {'f',"feedfile", &feedfile, op_string },
2388 {'q',"quiet-multiple", &quiet_multiple, op_booltrue, 1 },
2390 { 0, "max-connections", &max_connections op_integer },
2391 { 0, "max-queue-per-conn", &max_queue_per_conn op_integer },
2394 { 0, "streaming", &try_stream, op_booltrue, 1 },
2395 { 0, "no-streaming", &try_stream, op_boolfalse, 1 },
2396 {'P',"port", &port op_integer },
2397 { 0, "inndconf", &inndconffile, op_string },
2398 {'d',"daemon", &become_daemon, op_booltrue, 1 },
2399 { 0, "no-daemon", &become_daemon, op_boolfalse, 1 },
2401 { 0, "no-check-proportion", &nocheck_thresh_pct, op_double },
2402 { 0, "no-check-filter", &nocheck_decay_articles, op_double },
2404 { 0, "reconnect-interval", &reconnect_delay_periods, op_periods_rndup },
2405 { 0, "flush-retry-interval", &flushfail_retry_periods, op_periods_rndup },
2406 { 0, "connection-timeout", &connection_timeout, op_seconds },
2407 { 0, "inndcomm-timeout", &inndcomm_flush_timeout, op_seconds },
2410 int main(int argc, char **argv) {
2416 if (*arg != '-') break;
2417 if (!strcmp(arg,"--")) { arg= *++argv; break; }
2419 while ((a= *++arg)) {
2423 char *equals= strchr(arg,'=');
2424 int len= equals ? (equals - arg) : strlen(arg);
2425 for (o=options; o->long; o++)
2426 if (strlen(o->long) == len && !memcmp(o->long,arg,len))
2428 badusage("unknown long option --%s",arg);
2431 if (equals) badusage("option --%s does not take a value",o->long);
2433 } else if (equals) {
2437 if (!arg) badusage("option --%s needs a value",o->long);
2440 break; /* eaten the whole argument now */
2442 for (o=options; o->long; o++)
2445 badusage("unknown short option -%c",a);
2452 if (!arg) badusage("option -%c needs a value",o->short);
2455 break; /* eaten the whole argument now */
2460 if (!arg) badusage("need site name argument");
2466 if (*++argv) badusage("too many non-option arguments");
2468 if (nocheck_thresh_pct < 0 || nocheck_thresh_pct > 100)
2469 badusage("nocheck threshold percentage must be between 0..100");
2470 nocheck_thresh= nocheck_thresh_pct * 0.01;
2472 if (nocheck_decay_articles < 0.1)
2473 badusage("nocheck decay articles must be at least 0.1");
2474 nocheck_decay= 1 - 1/nocheck_decay_articles;
2477 pathoutgoing= innconf->pathoutgoing;
2478 innconf_read(inndconffile);
2481 feedfile= xasprintf("%s/%s",pathoutgoing,sitename);
2482 else if (!feedfile[0])
2483 badusage("feed filename must be nonempty");
2484 else if (feedfile[strlen(feedfile)-1]=='/')
2485 feedfile= xasprintf("%s%s",feedfile,sitename);
2487 const char *feedfile_forbidden= "?*[~#";
2489 while ((c= *feedfile_forbidden++))
2490 if (strchr(feedfile, c))
2491 badusage("feed filename may not contain metacharacter %c",c);
2493 loop= oop_sys_new();
2494 if (!loop) sysdie("could not create liboop event loop");
2496 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
2497 sysdie("could not ignore SIGPIPE");
2499 if (become_daemon) {
2500 for (i=3; i<255; i++)
2501 /* do this now before we open syslog, etc. */
2503 openlog("innduct",LOG_NDELAY|LOG_PID,LOG_NEWS);
2505 int null= open("/dev/null",O_RDWR);
2506 if (null<0) sysdie("failed to open /dev/null");
2512 pid_t child1= xfork("daemonise first fork");
2513 if (child1) _exit(0);
2515 pid_t sid= setsid();
2516 if (sid != child1) sysdie("setsid failed");
2518 pid_t child2= xfork("daemonise second fork");
2519 if (child2) _exit(0);
2524 if (!filemon_init()) {
2525 warn("no file monitoring available, polling");
2526 filepoll_schedule();