3 * tailing reliable realtime streaming feeder for inn
4 * filemon.c - file monitoring (inotify, kqueue, poll, etc.)
6 * Copyright (C) 2010 Ian Jackson <ijackson@chiark.greenend.org.uk>
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * (I believe that when you compile and link this as part of the inn2
22 * build, with the Makefile runes I have provided, all the libraries
23 * and files which end up included in innduct are licence-compatible
24 * with GPLv3. If not then please let me know. -Ian Jackson.)
29 /*---------- filemon implemented with inotify ----------*/
31 #if defined(HAVE_SYS_INOTIFY_H) && !defined(HAVE_FILEMON)
34 #include <sys/inotify.h>
36 static int filemon_inotify_fd;
37 static int filemon_inotify_wdmax;
38 static InputFile **filemon_inotify_wd2ipf;
40 struct Filemon_Perfile {
44 static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) {
45 int wd= inotify_add_watch(filemon_inotify_fd, ipf->path, IN_MODIFY);
46 if (wd < 0) sysdie("inotify_add_watch %s", ipf->path);
48 if (wd >= filemon_inotify_wdmax) {
50 filemon_inotify_wd2ipf= xrealloc(filemon_inotify_wd2ipf,
51 sizeof(*filemon_inotify_wd2ipf) * newmax);
52 memset(filemon_inotify_wd2ipf + filemon_inotify_wdmax, 0,
53 sizeof(*filemon_inotify_wd2ipf) * (newmax - filemon_inotify_wdmax));
54 filemon_inotify_wdmax= newmax;
57 assert(!filemon_inotify_wd2ipf[wd]);
58 filemon_inotify_wd2ipf[wd]= ipf;
60 dbg("filemon inotify startfile %p wd=%d wdmax=%d",
61 ipf, wd, filemon_inotify_wdmax);
66 static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) {
68 dbg("filemon inotify stopfile %p wd=%d", ipf, wd);
69 int r= inotify_rm_watch(filemon_inotify_fd, wd);
70 if (r) syscrash("inotify_rm_watch");
71 filemon_inotify_wd2ipf[wd]= 0;
74 static void *filemon_inotify_readable(oop_source *lp, int fd,
75 oop_event e, void *u) {
76 struct inotify_event iev;
78 int r= read(filemon_inotify_fd, &iev, sizeof(iev));
80 if (isewouldblock(errno)) break;
81 syscrash("read from inotify master");
82 } else if (r==sizeof(iev)) {
83 assert(iev.wd >= 0 && iev.wd < filemon_inotify_wdmax);
85 crash("inotify read %d bytes wanted struct of %d", r, (int)sizeof(iev));
87 InputFile *ipf= filemon_inotify_wd2ipf[iev.wd];
88 /*dbg("filemon inotify readable read %p wd=%d", ipf, iev.wd);*/
89 tailing_make_readable(ipf);
94 int filemon_method_init(void) {
95 filemon_inotify_fd= inotify_init();
96 if (filemon_inotify_fd<0) {
97 syswarn("filemon/inotify: inotify_init failed");
100 xsetnonblock(filemon_inotify_fd, 1);
101 loop->on_fd(loop, filemon_inotify_fd, OOP_READ, filemon_inotify_readable, 0);
103 dbg("filemon inotify init filemon_inotify_fd=%d", filemon_inotify_fd);
107 void filemon_method_dump_info(FILE *f) {
109 fprintf(f,"inotify");
110 DUMPV("%d",,filemon_inotify_fd);
111 DUMPV("%d",,filemon_inotify_wdmax);
112 for (i=0; i<filemon_inotify_wdmax; i++)
113 fprintf(f," wd2ipf[%d]=%p\n", i, filemon_inotify_wd2ipf[i]);
116 #endif /* HAVE_INOTIFY && !HAVE_FILEMON */
118 /*---------- filemon dummy implementation ----------*/
120 #if !defined(HAVE_FILEMON)
122 struct Filemon_Perfile { int dummy; };
124 int filemon_method_init(void) {
125 warn("filemon/dummy: no filemon method compiled in");
128 static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) { }
129 static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) { }
130 void filemon_method_dump_info(FILE *f) { fprintf(f,"dummy\n"); }
132 #endif /* !HAVE_FILEMON */
134 /*---------- filemon generic interface ----------*/
136 void filemon_start(InputFile *ipf) {
137 assert(!ipf->filemon);
140 filemon_method_startfile(ipf, ipf->filemon);
143 void filemon_stop(InputFile *ipf) {
144 if (!ipf->filemon) return;
145 filemon_method_stopfile(ipf, ipf->filemon);