X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudevd.c;h=d227a71fd1f5bc742229275ecb576cc723bae5df;hp=bfd732319d36862c4d5a371ce10093d1ab362188;hb=e9a77fd828e9d415e4d64dd74aa780a61f726536;hpb=c969f8806272b9fec50eb3325727cd012ce8dd1c diff --git a/udev/udevd.c b/udev/udevd.c index bfd732319..d227a71fd 100644 --- a/udev/udevd.c +++ b/udev/udevd.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -63,10 +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; @@ -194,8 +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); @@ -520,8 +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) @@ -633,10 +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[] = { @@ -648,7 +644,6 @@ int main(int argc, char *argv[]) {} }; int rc = 1; - int maxfd; udev = udev_new(); if (udev == NULL) @@ -731,34 +726,6 @@ 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"); @@ -823,9 +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)); } @@ -837,7 +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); @@ -884,32 +851,49 @@ 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) { + sigset_t blocked_mask, orig_mask; + struct pollfd pfd[4]; + struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL; + int nfds = 0; int fdcount; - 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); - if (inotify_fd >= 0) - FD_SET(inotify_fd, &readfds); - fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL); + sigfillset(&blocked_mask); + sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask); + if (signal_received) { + sigprocmask(SIG_SETMASK, &orig_mask, NULL); + goto handle_signals; + } + + ctrl_poll = &pfd[nfds++]; + ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl); + ctrl_poll->events = POLLIN; + + monitor_poll = &pfd[nfds++]; + monitor_poll->fd = udev_monitor_get_fd(kernel_monitor); + monitor_poll->events = POLLIN; + + if (inotify_fd >= 0) { + inotify_poll = &pfd[nfds++]; + inotify_poll->fd = inotify_fd; + inotify_poll->events = POLLIN; + } + + 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); @@ -924,15 +908,8 @@ 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 */ @@ -951,6 +928,9 @@ 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; @@ -978,10 +958,6 @@ int main(int argc, char *argv[]) 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);