[PATCH] udevd race conditions and performance, assorted cleanups - take 2
here is a patch on top of your nice improvements. I fixed the whitespace and it hopefully fixes the stupid timestamp bug in udevd. Some stupid OS sets the hwclock to localtime and linux changes it to UTC while starting. If any events are pending they may be delayed by the users time distance from UTC :) So we use the uptime seconds now.
This commit is contained in:
kay.sievers@vrfy.org
Greg KH
parent
f27125f98f
commit
e5a2989efb
5
Makefile
5
Makefile
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@ -220,6 +220,7 @@ HEADERS = udev.h \
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ifeq ($(strip $(USE_KLIBC)),true)
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OBJS += klibc_fixups.o
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KLIBC_FIXUP = klibc_fixups.o
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endif
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# header files automatically generated
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@ -266,8 +267,8 @@ $(INFO): $(INFO).o $(OBJS) $(HEADERS) $(LIBC)
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$(LD) $(LDFLAGS) -o $@ $(CRT0) udevinfo.o udev_lib.o udev_config.o udevdb.o $(SYSFS) $(TDB) $(LIB_OBJS) $(ARCH_LIB_OBJS)
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$(STRIPCMD) $@
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$(DAEMON): $(DAEMON).o udevd.h $(LIBC)
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$(LD) $(LDFLAGS) -o $@ $(CRT0) udevd.o $(LIB_OBJS) $(ARCH_LIB_OBJS)
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$(DAEMON): $(DAEMON).o $(OBJS) udevd.h $(LIBC)
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$(LD) $(LDFLAGS) -o $@ $(CRT0) udevd.o udev_lib.o $(KLIBC_FIXUP) $(LIB_OBJS) $(ARCH_LIB_OBJS)
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$(STRIPCMD) $@
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$(SENDER): $(SENDER).o udevd.h $(LIBC)
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@ -30,12 +30,14 @@
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#include "udev.h"
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#include "klibc_fixups.h"
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#include "udev_lib.h"
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#include "logging.h"
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#define PW_FILE "/etc/passwd"
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#define GR_FILE "/etc/group"
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#define UTMP_FILE "/var/run/utmp"
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_syscall1(int, sysinfo, struct sysinfo *, info);
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/* return the id of a passwd style line, selected by the users name */
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static unsigned long get_id_by_name(const char *uname, const char *dbfile)
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@ -3,6 +3,11 @@
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#ifndef KLIBC_FIXUPS_H
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#define KLIBC_FIXUPS_H
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#include <linux/kernel.h>
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#include <linux/unistd.h>
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int sysinfo(struct sysinfo *info);
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struct passwd {
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char *pw_name; /* user name */
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char *pw_passwd; /* user password */
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@ -36,8 +36,7 @@
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/* Debugging */
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#ifdef DEBUG
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#include "../logging.h"
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#define dprintf(format, arg...) \
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dbg(format, ##arg)
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#define dprintf(format, arg...) dbg(format, ##arg)
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#else
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#define dprintf(format, arg...) do { } while (0)
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#endif
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87
udevd.c
87
udevd.c
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@ -28,12 +28,15 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include "klibc_fixups.h"
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#ifndef __KLIBC__
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#include <sys/sysinfo.h>
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#endif
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#include "list.h"
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#include "udev.h"
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@ -106,6 +109,7 @@ static void run_queue_delete(struct hotplug_msg *msg)
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static void msg_queue_insert(struct hotplug_msg *msg)
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{
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struct hotplug_msg *loop_msg;
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struct sysinfo info;
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/* sort message by sequence number into list. events
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* will tend to come in order, so scan the list backwards
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@ -113,11 +117,13 @@ static void msg_queue_insert(struct hotplug_msg *msg)
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list_for_each_entry_reverse(loop_msg, &msg_list, list)
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if (loop_msg->seqnum < msg->seqnum)
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break;
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list_add(&msg->list, &loop_msg->list);
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dbg("queued message seq %d", msg->seqnum);
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/* store timestamp of queuing */
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msg->queue_time = time(NULL);
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sysinfo(&info);
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msg->queue_time = info.uptime;
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list_add(&msg->list, &loop_msg->list);
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dbg("queued message seq %d", msg->seqnum);
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/* run msg queue manager */
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run_msg_q = 1;
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@ -203,7 +209,8 @@ static void msg_queue_manager()
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{
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struct hotplug_msg *loop_msg;
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struct hotplug_msg *tmp_msg;
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time_t msg_age = 0;
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struct sysinfo info;
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long msg_age = 0;
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dbg("msg queue manager, next expected is %d", expected_seqnum);
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recheck:
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@ -215,7 +222,9 @@ recheck:
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}
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/* move event with expired timeout to the exec list */
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msg_age = time(NULL) - loop_msg->queue_time;
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sysinfo(&info);
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msg_age = info.uptime - loop_msg->queue_time;
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dbg("seq %d is %li seconds old", loop_msg->seqnum, msg_age);
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if (msg_age > EVENT_TIMEOUT_SEC-1) {
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msg_move_exec(loop_msg);
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goto recheck;
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@ -226,11 +235,10 @@ recheck:
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msg_dump_queue();
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/* set timeout for remaining queued events */
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if (list_empty(&msg_list) == 0) {
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/* set timeout for remaining queued events */
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struct itimerval itv = {{0, 0}, {EVENT_TIMEOUT_SEC - msg_age, 0}};
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dbg("next event expires in %li seconds",
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EVENT_TIMEOUT_SEC - msg_age);
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dbg("next event expires in %li seconds", EVENT_TIMEOUT_SEC - msg_age);
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setitimer(ITIMER_REAL, &itv, 0);
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}
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}
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@ -399,25 +407,25 @@ int main(int argc, char *argv[])
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dbg("need to be root, exit");
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exit(1);
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}
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/* setup signal handler pipe */
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retval = pipe(pipefds);
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if (retval < 0) {
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dbg("error getting pipes: %s", strerror(errno));
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exit(1);
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}
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retval = fcntl(pipefds[0], F_SETFL, O_NONBLOCK);
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if (retval < 0) {
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dbg("fcntl on read pipe: %s", strerror(errno));
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exit(1);
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}
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retval = fcntl(pipefds[1], F_SETFL, O_NONBLOCK);
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if (retval < 0) {
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dbg("fcntl on write pipe: %s", strerror(errno));
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exit(1);
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}
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retval = pipe(pipefds);
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if (retval < 0) {
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dbg("error getting pipes: %s", strerror(errno));
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exit(1);
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}
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retval = fcntl(pipefds[0], F_SETFL, O_NONBLOCK);
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if (retval < 0) {
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dbg("error fcntl on read pipe: %s", strerror(errno));
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exit(1);
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}
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retval = fcntl(pipefds[1], F_SETFL, O_NONBLOCK);
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if (retval < 0) {
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dbg("error fcntl on write pipe: %s", strerror(errno));
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exit(1);
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}
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/* set signal handlers */
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act.sa_handler = sig_handler;
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@ -450,43 +458,42 @@ int main(int argc, char *argv[])
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/* enable receiving of the sender credentials */
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setsockopt(ssock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
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FD_ZERO(&readfds);
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FD_SET(ssock, &readfds);
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FD_SET(pipefds[0], &readfds);
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FD_ZERO(&readfds);
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FD_SET(ssock, &readfds);
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FD_SET(pipefds[0], &readfds);
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maxsockplus = ssock+1;
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while (1) {
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fd_set workreadfds = readfds;
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retval = select(maxsockplus, &workreadfds, NULL, NULL, NULL);
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if (retval < 0) {
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dbg("error in select: %s", strerror(errno));
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if (errno != EINTR)
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dbg("error in select: %s", strerror(errno));
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continue;
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}
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if (FD_ISSET(ssock, &workreadfds))
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handle_msg(ssock);
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if (FD_ISSET(pipefds[0], &workreadfds))
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user_sighandler();
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if (children_waiting) {
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children_waiting = 0;
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reap_kids();
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}
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if (run_msg_q) {
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run_msg_q = 0;
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msg_queue_manager();
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}
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if (run_exec_q) {
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/* this is tricky. exec_queue_manager() loops over exec_list, and
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* calls running_with_devpath(), which loops over running_list. This gives
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* O(N*M), which can get *nasty*. Clean up running_list before
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* calling exec_queue_manager().
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*/
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if (children_waiting) {
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children_waiting = 0;
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reap_kids();
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2
udevd.h
2
udevd.h
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@ -34,7 +34,7 @@ struct hotplug_msg {
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struct list_head list;
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pid_t pid;
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int seqnum;
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time_t queue_time;
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long queue_time;
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char action[ACTION_SIZE];
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char devpath[DEVPATH_SIZE];
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char subsystem[SUBSYSTEM_SIZE];
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17
udevsend.c
17
udevsend.c
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@ -26,13 +26,13 @@
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <sys/un.h>
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#include <time.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include <linux/stddef.h>
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#include "udev.h"
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@ -53,16 +53,15 @@ void log_message (int level, const char *format, ...)
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}
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#endif
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static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
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char *devpath, char *subsystem, int seqnum)
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static void build_hotplugmsg(struct hotplug_msg *msg, char *action,
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char *devpath, char *subsystem, int seqnum)
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{
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memset(msg, 0x00, sizeof(*msg));
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memset(msg, 0x00, sizeof(struct hotplug_msg));
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strfieldcpy(msg->magic, UDEV_MAGIC);
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msg->seqnum = seqnum;
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strfieldcpy(msg->action, action);
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strfieldcpy(msg->devpath, devpath);
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strfieldcpy(msg->subsystem, subsystem);
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return sizeof(struct hotplug_msg);
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}
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static int start_daemon(void)
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@ -108,7 +107,6 @@ int main(int argc, char* argv[])
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char *seqnum;
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int seq;
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int retval = 1;
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int size;
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int loop;
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struct timespec tspec;
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int sock;
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@ -155,18 +153,19 @@ int main(int argc, char* argv[])
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goto exit;
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}
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memset(&saddr, 0x00, sizeof(saddr));
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memset(&saddr, 0x00, sizeof(struct sockaddr_un));
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saddr.sun_family = AF_LOCAL;
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/* use abstract namespace for socket path */
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strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
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addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
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size = build_hotplugmsg(&msg, action, devpath, subsystem, seq);
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build_hotplugmsg(&msg, action, devpath, subsystem, seq);
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/* If we can't send, try to start daemon and resend message */
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loop = UDEVSEND_CONNECT_RETRY;
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while (loop--) {
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retval = sendto(sock, &msg, size, 0, (struct sockaddr *)&saddr, addrlen);
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retval = sendto(sock, &msg, sizeof(struct hotplug_msg), 0,
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(struct sockaddr *)&saddr, addrlen);
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if (retval != -1) {
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retval = 0;
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goto close_and_exit;
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