X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudevd.c;h=bc6484b1b0b55a17c6dc51e06313515dc8e1e715;hp=405a1ed9071290dd13ffbb1d0ea81fe1fd911dc1;hb=3210a72ba314dd15e6f7ed85ee22d7a5a0944b7a;hpb=00f98bd2b3cc8205ec70e2b1a6fc2132dba3d9ba diff --git a/udev/udevd.c b/udev/udevd.c index 405a1ed90..bc6484b1b 100644 --- a/udev/udevd.c +++ b/udev/udevd.c @@ -27,7 +27,9 @@ #include #include #include +#include #include +#include #include #include #include @@ -62,10 +64,10 @@ static struct udev_rules *rules; static struct udev_ctrl *udev_ctrl; static struct udev_monitor *kernel_monitor; static int inotify_fd = -1; -static int signal_pipe[2] = {-1, -1}; static volatile int sigchilds_waiting; static volatile int udev_exit; static volatile int reload_config; +static volatile int signal_received; static int run_exec_q; static int stop_exec_q; static int max_childs; @@ -193,8 +195,6 @@ static void event_fork(struct udev_event *event) udev_ctrl_unref(udev_ctrl); if (inotify_fd >= 0) close(inotify_fd); - close(signal_pipe[READ_END]); - close(signal_pipe[WRITE_END]); logging_close(); logging_init("udevd-event"); setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY); @@ -519,8 +519,7 @@ static void asmlinkage sig_handler(int signum) break; } - /* write to pipe, which will wakeup select() in our mainloop */ - write(signal_pipe[WRITE_END], "", 1); + signal_received = 1; } static void udev_done(int pid, int exitstatus) @@ -569,6 +568,38 @@ static void reap_sigchilds(void) } } +static void cleanup_queue_dir(struct udev *udev) +{ + char dirname[UTIL_PATH_SIZE]; + char filename[UTIL_PATH_SIZE]; + DIR *dir; + + util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename)); + util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename)); + unlink(filename); + + util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname)); + util_strlcat(dirname, "/.udev/queue", sizeof(dirname)); + dir = opendir(dirname); + if (dir != NULL) { + while (1) { + struct dirent *dent; + + dent = readdir(dir); + if (dent == NULL || dent->d_name[0] == '\0') + break; + if (dent->d_name[0] == '.') + continue; + util_strlcpy(filename, dirname, sizeof(filename)); + util_strlcat(filename, "/", sizeof(filename)); + util_strlcat(filename, dent->d_name, sizeof(filename)); + unlink(filename); + } + closedir(dir); + rmdir(dirname); + } +} + static void export_initial_seqnum(struct udev *udev) { char filename[UTIL_PATH_SIZE]; @@ -600,10 +631,8 @@ static void export_initial_seqnum(struct udev *udev) int main(int argc, char *argv[]) { struct udev *udev; - int err; int fd; struct sigaction act; - fd_set readfds; const char *value; int daemonize = 0; static const struct option options[] = { @@ -615,7 +644,6 @@ int main(int argc, char *argv[]) {} }; int rc = 1; - int maxfd; udev = udev_new(); if (udev == NULL) @@ -698,40 +726,13 @@ int main(int argc, char *argv[]) } udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024); - err = pipe(signal_pipe); - if (err < 0) { - err(udev, "error getting pipes: %m\n"); - goto exit; - } - - err = fcntl(signal_pipe[READ_END], F_GETFL, 0); - if (err < 0) { - err(udev, "error fcntl on read pipe: %m\n"); - goto exit; - } - err = fcntl(signal_pipe[READ_END], F_SETFL, err | O_NONBLOCK); - if (err < 0) { - err(udev, "error fcntl on read pipe: %m\n"); - goto exit; - } - - err = fcntl(signal_pipe[WRITE_END], F_GETFL, 0); - if (err < 0) { - err(udev, "error fcntl on write pipe: %m\n"); - goto exit; - } - err = fcntl(signal_pipe[WRITE_END], F_SETFL, err | O_NONBLOCK); - if (err < 0) { - err(udev, "error fcntl on write pipe: %m\n"); - goto exit; - } - rules = udev_rules_new(udev, 1); if (rules == NULL) { err(udev, "error reading rules\n"); goto exit; } udev_list_init(&event_list); + cleanup_queue_dir(udev); export_initial_seqnum(udev); if (daemonize) { @@ -789,9 +790,10 @@ int main(int argc, char *argv[]) util_strlcat(path, "/class/mem/null", sizeof(path)); if (lstat(path, &statbuf) == 0) { if (S_ISDIR(statbuf.st_mode)) { - const char *depr_str = "<6>udev: deprecated sysfs layout (kernel too old, " - "or CONFIG_SYSFS_DEPRECATED) is unsupported, some " - "udev features may fail\n"; + const char *depr_str = + "<6>udev: deprecated sysfs layout; update the kernel or " + "disable CONFIG_SYSFS_DEPRECATED; some udev features will " + "not work correctly\n"; write(fd, depr_str, strlen(depr_str)); } @@ -803,7 +805,6 @@ int main(int argc, char *argv[]) memset(&act, 0x00, sizeof(struct sigaction)); act.sa_handler = (void (*)(int)) sig_handler; sigemptyset(&act.sa_mask); - act.sa_flags = SA_RESTART; sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); sigaction(SIGCHLD, &act, NULL); @@ -830,7 +831,7 @@ int main(int argc, char *argv[]) IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE); } } else if (errno == ENOSYS) - err(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n"); + info(udev, "unable to use inotify, udevd will not monitor rule files changes\n"); else err(udev, "inotify_init failed: %m\n"); @@ -850,32 +851,45 @@ int main(int argc, char *argv[]) max_childs = strtoul(value, NULL, 10); info(udev, "initialize max_childs to %u\n", max_childs); - maxfd = udev_ctrl_get_fd(udev_ctrl); - maxfd = UDEV_MAX(maxfd, udev_monitor_get_fd(kernel_monitor)); - maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]); - maxfd = UDEV_MAX(maxfd, inotify_fd); while (!udev_exit) { - int fdcount; + sigset_t blocked_mask, orig_mask; + struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL; + struct pollfd pfd[10]; + int fdcount, nfds = 0; + + sigfillset(&blocked_mask); + sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask); + if (signal_received) { + sigprocmask(SIG_SETMASK, &orig_mask, NULL); + goto handle_signals; + } - FD_ZERO(&readfds); - FD_SET(signal_pipe[READ_END], &readfds); - FD_SET(udev_ctrl_get_fd(udev_ctrl), &readfds); - FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds); +#define POLL_FOR(__desc, __pollptr) do { \ + pfd[nfds].fd = (__desc); pfd[nfds].events = POLLIN; \ + __pollptr = &pfd[nfds++]; \ +} while (0) + POLL_FOR(udev_ctrl_get_fd(udev_ctrl), ctrl_poll); + POLL_FOR(udev_monitor_get_fd(kernel_monitor), monitor_poll); if (inotify_fd >= 0) - FD_SET(inotify_fd, &readfds); - fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL); + POLL_FOR(inotify_fd, inotify_poll); +#undef POLL_FOR + + fdcount = ppoll(pfd, nfds, NULL, &orig_mask); + sigprocmask(SIG_SETMASK, &orig_mask, NULL); + if (fdcount < 0) { - if (errno != EINTR) - err(udev, "error in select: %m\n"); + if (errno == EINTR) + goto handle_signals; + err(udev, "error in select: %m\n"); continue; } /* get control message */ - if (FD_ISSET(udev_ctrl_get_fd(udev_ctrl), &readfds)) + if (ctrl_poll->revents & POLLIN) handle_ctrl_msg(udev_ctrl); /* get kernel uevent */ - if (FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) { + if (monitor_poll->revents & POLLIN) { struct udev_device *dev; dev = udev_monitor_receive_device(kernel_monitor); @@ -890,15 +904,8 @@ int main(int argc, char *argv[]) } } - /* received a signal, clear our notification pipe */ - if (FD_ISSET(signal_pipe[READ_END], &readfds)) { - char buf[256]; - - read(signal_pipe[READ_END], &buf, sizeof(buf)); - } - /* rules directory inotify watch */ - if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) { + if (inotify_poll && (inotify_poll->revents & POLLIN)) { int nbytes; /* discard all possible events, we can just reload the config */ @@ -917,6 +924,9 @@ int main(int argc, char *argv[]) } } +handle_signals: + signal_received = 0; + /* rules changed, set by inotify or a HUP signal */ if (reload_config) { struct udev_rules *rules_new; @@ -940,21 +950,14 @@ int main(int argc, char *argv[]) event_queue_manager(udev); } } + cleanup_queue_dir(udev); rc = 0; - exit: udev_rules_unref(rules); - - if (signal_pipe[READ_END] >= 0) - close(signal_pipe[READ_END]); - if (signal_pipe[WRITE_END] >= 0) - close(signal_pipe[WRITE_END]); - udev_ctrl_unref(udev_ctrl); if (inotify_fd >= 0) close(inotify_fd); udev_monitor_unref(kernel_monitor); - udev_selinux_exit(udev); udev_unref(udev); logging_close();