diff options
| -rw-r--r-- | etc/udev/udev.conf.in | 4 | ||||
| -rw-r--r-- | udev_libc_wrapper.h | 69 | ||||
| -rw-r--r-- | udevcontrol.c | 3 | ||||
| -rw-r--r-- | udevd.c | 142 | ||||
| -rw-r--r-- | udevd.h | 1 |
5 files changed, 192 insertions, 27 deletions
diff --git a/etc/udev/udev.conf.in b/etc/udev/udev.conf.in index efdb1d18..c44ed309 100644 --- a/etc/udev/udev.conf.in +++ b/etc/udev/udev.conf.in @@ -9,6 +9,8 @@ udev_db="@udevdir@/.udevdb" # The name and location of the udev rules file(s). udev_rules="@configdir@/rules.d" -# The syslog(3) priority: "err", "info", or the numerical value. +# The initial syslog(3) priority: "err", "info", "debug" or its +# numerical equivalent. For runtime debugging, change the daemons +# internal state with: "udevcontrol log_priority=<value>". udev_log="err" diff --git a/udev_libc_wrapper.h b/udev_libc_wrapper.h index 6f8c8f24..9a8b26a2 100644 --- a/udev_libc_wrapper.h +++ b/udev_libc_wrapper.h @@ -24,7 +24,72 @@ #include <string.h> #include <unistd.h> -#include <linux/types.h> +#include <stdint.h> + +/* needed until Inotify! syscalls reach glibc */ +#include <sys/syscall.h> +#ifndef __NR_inotify_init +#if defined(__i386__) +# define __NR_inotify_init 291 +# define __NR_inotify_add_watch 292 +# define __NR_inotify_rm_watch 293 +#elif defined(__x86_64__) +# define __NR_inotify_init 253 +# define __NR_inotify_add_watch 254 +# define __NR_inotify_rm_watch 255 +#elif defined(__powerpc__) || defined(__powerpc64__) +# define __NR_inotify_init 275 +# define __NR_inotify_add_watch 276 +# define __NR_inotify_rm_watch 277 +#elif defined (__ia64__) +# define __NR_inotify_init 1277 +# define __NR_inotify_add_watch 1278 +# define __NR_inotify_rm_watch 1279 +#elif defined (__s390__) +# define __NR_inotify_init 284 +# define __NR_inotify_add_watch 285 +# define __NR_inotify_rm_watch 286 +#elif defined (__alpha__) +# define __NR_inotify_init 444 +# define __NR_inotify_add_watch 445 +# define __NR_inotify_rm_watch 446 +#elif defined (__sparc__) || defined (__sparc64__) +# define __NR_inotify_init 151 +# define __NR_inotify_add_watch 152 +# define __NR_inotify_rm_watch 156 +#elif defined (__arm__) +# define __NR_inotify_init 316 +# define __NR_inotify_add_watch 317 +# define __NR_inotify_rm_watch 318 +#elif defined (__sh__) +# define __NR_inotify_init 290 +# define __NR_inotify_add_watch 291 +# define __NR_inotify_rm_watch 292 +#else +# error "Unsupported architecture!" +#endif +#endif /* __NR_inotify_init */ + +/* needed until /usr/include/sys/inotify.h is working */ +#ifdef __KLIBC__ +#include <sys/inotify.h> +#else +static inline int inotify_init(void) +{ + return syscall(__NR_inotify_init); +} + +static inline int inotify_add_watch(int fd, const char *name, uint32_t mask) +{ + return syscall(__NR_inotify_add_watch, fd, name, mask); +} +#define IN_CREATE 0x00000100 /* Subfile was created */ +#define IN_MOVED_FROM 0x00000040 /* File was moved from X */ +#define IN_MOVED_TO 0x00000080 /* File was moved to Y */ +#define IN_DELETE 0x00000200 /* Subfile was deleted */ +#define IN_CLOSE_WRITE 0x00000008 /* Writtable file was closed */ +#define IN_MOVE (IN_MOVED_FROM | IN_MOVED_TO) /* moves */ +#endif /* __KLIBC__ */ /* needed for our signal handlers to work */ #undef asmlinkage @@ -32,7 +97,7 @@ #define asmlinkage __attribute__((regparm(0))) #else #define asmlinkage -#endif +#endif /* __i386__ */ /* headers are broken on some lazy platforms */ #ifndef __FD_SET diff --git a/udevcontrol.c b/udevcontrol.c index 6651e976..00b435ed 100644 --- a/udevcontrol.c +++ b/udevcontrol.c @@ -89,6 +89,8 @@ int main(int argc, char *argv[], char *envp[]) usend_msg.type = UDEVD_STOP_EXEC_QUEUE; else if (!strcmp(arg, "start_exec_queue")) usend_msg.type = UDEVD_START_EXEC_QUEUE; + else if (!strcmp(arg, "reload_rules")) + usend_msg.type = UDEVD_RELOAD_RULES; else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) { intval = (int *) usend_msg.envbuf; val = &arg[strlen("log_priority=")]; @@ -106,6 +108,7 @@ int main(int argc, char *argv[], char *envp[]) " log_priority=<level> set the udev log level for the daemon\n" " stop_exec_queue keep udevd from executing events, queue only\n" " start_exec_queue execute events, flush queue\n" + " reload_rules reloads the rules files\n" " max_childs=<N> maximum number of childs running at the same time\n" " --help print this help text\n\n"); exit(0); @@ -39,6 +39,7 @@ #include <sys/un.h> #include <sys/sysinfo.h> #include <sys/stat.h> +#include <sys/ioctl.h> #include <linux/types.h> #include <linux/netlink.h> @@ -46,23 +47,26 @@ #include "udev_libc_wrapper.h" #include "udev.h" #include "udev_version.h" +#include "udev_rules.h" #include "udev_utils.h" #include "udevd.h" #include "logging.h" /* global variables*/ +struct udev_rules rules; static int udevd_sock; static int uevent_netlink_sock; +static int inotify_fd; static pid_t sid; static int signal_pipe[2] = {-1, -1}; static volatile int sigchilds_waiting; static volatile int run_msg_q; static volatile int udev_exit; +static volatile int reload_config; static int init_phase = 1; static int run_exec_q; static int stop_exec_q; -static char *udev_bin; static int event_timeout; static int max_childs; static int max_childs_running; @@ -75,7 +79,7 @@ static LIST_HEAD(running_list); #ifdef USE_LOG -void log_message (int priority, const char *format, ...) +void log_message(int priority, const char *format, ...) { va_list args; @@ -151,10 +155,55 @@ static void msg_queue_insert(struct uevent_msg *msg) return; } -/* forks event and removes event from run queue when finished */ +static void asmlinkage udev_event_sig_handler(int signum) +{ + if (signum == SIGALRM) + exit(1); +} + +static int udev_event_process(struct uevent_msg *msg) +{ + struct sigaction act; + struct udevice udev; + struct name_entry *name_loop; + int i; + int retval; + + /* set signal handlers */ + memset(&act, 0x00, sizeof(act)); + act.sa_handler = (void (*)(int)) udev_event_sig_handler; + sigemptyset (&act.sa_mask); + act.sa_flags = 0; + sigaction(SIGALRM, &act, NULL); + + /* trigger timeout to prevent hanging processes */ + alarm(UDEV_ALARM_TIMEOUT); + + /* reconstruct env from message */ + for (i = 0; msg->envp[i]; i++) + putenv(msg->envp[i]); + + udev_init_device(&udev, msg->devpath, msg->subsystem, msg->action); + retval = udev_process_event(&rules, &udev); + + /* run programs collected by RUN-key*/ + if (!retval) { + list_for_each_entry(name_loop, &udev.run_list, node) { + if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0) + pass_env_to_socket(&name_loop->name[strlen("socket:")], msg->devpath, msg->action); + else + run_program(name_loop->name, udev.subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO)); + } + } + + udev_cleanup_device(&udev); + + return 0; +} + +/* runs event and removes event from run queue when finished */ static void udev_event_run(struct uevent_msg *msg) { - char *const argv[] = { "udev", msg->subsystem, NULL }; pid_t pid; struct sysinfo info; @@ -162,14 +211,22 @@ static void udev_event_run(struct uevent_msg *msg) switch (pid) { case 0: /* child */ - if (uevent_netlink_sock != -1) + if (uevent_netlink_sock > 0) close(uevent_netlink_sock); + if (inotify_fd > 0) + close(inotify_fd); close(udevd_sock); + close(signal_pipe[READ_END]); + close(signal_pipe[WRITE_END]); logging_close(); + + logging_init("udevd-event"); setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY); - execve(udev_bin, argv, msg->envp); - err("exec of child failed"); - _exit(1); + udev_event_process(msg); + info("seq %llu finished", msg->seqnum); + + logging_close(); + exit(0); case -1: err("fork of child failed"); msg_queue_delete(msg); @@ -421,9 +478,8 @@ recheck: if (msg_age >= timeout) { msg_move_exec(loop_msg); goto recheck; - } else { + } else break; - } } msg_dump_queue(); @@ -567,6 +623,10 @@ static struct uevent_msg *get_udevd_msg(void) info("udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i", *intval); max_childs = *intval; break; + case UDEVD_RELOAD_RULES: + info("udevd message (RELOAD_RULES) received"); + reload_config = 1; + break; default: dbg("unknown message type"); } @@ -640,6 +700,9 @@ static void asmlinkage sig_handler(int signum) /* set flag, then write to pipe if needed */ sigchilds_waiting = 1; break; + case SIGHUP: + reload_config = 1; + break; } /* write to pipe, which will wakeup select() in our mainloop */ @@ -838,17 +901,11 @@ int main(int argc, char *argv[], char *envp[]) err("error fcntl on read pipe: %s", strerror(errno)); goto exit; } - retval = fcntl(signal_pipe[READ_END], F_SETFD, FD_CLOEXEC); - if (retval < 0) - err("error fcntl on read pipe: %s", strerror(errno)); retval = fcntl(signal_pipe[WRITE_END], F_SETFL, O_NONBLOCK); if (retval < 0) { err("error fcntl on write pipe: %s", strerror(errno)); goto exit; } - retval = fcntl(signal_pipe[WRITE_END], F_SETFD, FD_CLOEXEC); - if (retval < 0) - err("error fcntl on write pipe: %s", strerror(errno)); /* set signal handlers */ memset(&act, 0x00, sizeof(struct sigaction)); @@ -861,6 +918,9 @@ int main(int argc, char *argv[], char *envp[]) sigaction(SIGCHLD, &act, NULL); sigaction(SIGHUP, &act, NULL); + /* parse the rules and keep it in memory */ + udev_rules_init(&rules, 0, 1); + if (init_udevd_socket() < 0) { if (errno == EADDRINUSE) dbg("another udevd running, exit"); @@ -871,14 +931,12 @@ int main(int argc, char *argv[], char *envp[]) } if (init_uevent_netlink_sock() < 0) - info("uevent socket not available"); + err("uevent socket not available"); - /* override of forked udev binary, used for testing */ - udev_bin = getenv("UDEV_BIN"); - if (udev_bin != NULL) - info("udev binary is set to '%s'", udev_bin); - else - udev_bin = UDEV_BIN; + /* watch rules directory */ + inotify_fd = inotify_init(); + if (inotify_fd > 0) + inotify_add_watch(inotify_fd, udev_rules_filename, IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE); /* init of expected_seqnum value */ value = getenv("UDEVD_EXPECTED_SEQNUM"); @@ -911,6 +969,9 @@ int main(int argc, char *argv[], char *envp[]) max_childs_running = UDEVD_MAX_CHILDS_RUNNING; info("initialize max_childs_running to %u", max_childs_running); + /* clear environment for forked event processes */ + clearenv(); + /* export log_priority , as called programs may want to follow that setting */ sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority); putenv(udev_log); @@ -924,8 +985,10 @@ int main(int argc, char *argv[], char *envp[]) FD_SET(udevd_sock, &readfds); if (uevent_netlink_sock > 0) FD_SET(uevent_netlink_sock, &readfds); + if (inotify_fd > 0) + FD_SET(inotify_fd, &readfds); - fdcount = select(UDEV_MAX(udevd_sock, uevent_netlink_sock)+1, &readfds, NULL, NULL, NULL); + fdcount = select(UDEV_MAX(uevent_netlink_sock, inotify_fd)+1, &readfds, NULL, NULL, NULL); if (fdcount < 0) { if (errno != EINTR) dbg("error in select: %s", strerror(errno)); @@ -965,6 +1028,33 @@ int main(int argc, char *argv[], char *envp[]) read(signal_pipe[READ_END], &buf, sizeof(buf)); } + /* rules directory inotify watch */ + if ((inotify_fd > 0) && FD_ISSET(inotify_fd, &readfds)) { + int nbytes; + + /* discard all possible events, we can just reload the config */ + if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes) { + char *buf; + + reload_config = 1; + buf = malloc(nbytes); + if (!buf) { + err("error getting buffer for inotify, disable watching"); + close(inotify_fd); + inotify_fd = -1; + } + read(inotify_fd, buf, nbytes); + free(buf); + } + } + + /* rules changed, set by inotify or a signal*/ + if (reload_config) { + reload_config = 0; + udev_rules_close(&rules); + udev_rules_init(&rules, 0, 1); + } + /* forked child have returned */ if (sigchilds_waiting) { sigchilds_waiting = 0; @@ -990,6 +1080,8 @@ int main(int argc, char *argv[], char *envp[]) } exit: + udev_rules_close(&rules); + if (signal_pipe[READ_END] > 0) close(signal_pipe[READ_END]); if (signal_pipe[WRITE_END] > 0) @@ -997,6 +1089,8 @@ exit: if (udevd_sock > 0) close(udevd_sock); + if (inotify_fd > 0) + close(inotify_fd); if (uevent_netlink_sock > 0) close(uevent_netlink_sock); @@ -54,6 +54,7 @@ enum udevd_msg_type { UDEVD_START_EXEC_QUEUE, UDEVD_SET_LOG_LEVEL, UDEVD_SET_MAX_CHILDS, + UDEVD_RELOAD_RULES, }; |