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authorGravatar Hector Martin2009-10-10 16:01:26 +0200
committerGravatar Hector Martin2009-10-10 16:01:26 +0200
commite855c861acde634662957131bbfb367260f8daf0 (patch)
tree4319250c5429d7ab20eccabc47b4b0893164986b /daemon/main.c
parent94033a862cb907c24cb2aaed1d4f1fb75652bfcd (diff)
downloadusbmuxd-e855c861acde634662957131bbfb367260f8daf0.tar.gz
usbmuxd-e855c861acde634662957131bbfb367260f8daf0.tar.bz2
Disable polling in udev mode, use udev to signal device discovery
Diffstat (limited to 'daemon/main.c')
-rw-r--r--daemon/main.c58
1 files changed, 43 insertions, 15 deletions
diff --git a/daemon/main.c b/daemon/main.c
index ef98e75..893f26d 100644
--- a/daemon/main.c
+++ b/daemon/main.c
@@ -48,6 +48,7 @@ static const char *socket_path = "/var/run/usbmuxd";
static const char *lockfile = "/var/run/usbmuxd.pid";
int should_exit;
+int should_discover;
static int verbose = 0;
static int foreground = 0;
@@ -96,21 +97,26 @@ int create_socket(void) {
void handle_signal(int sig)
{
- if (sig != SIGUSR1) {
+ if (sig != SIGUSR1 && sig != SIGUSR2) {
usbmuxd_log(LL_NOTICE,"Caught signal %d, exiting", sig);
should_exit = 1;
} else {
if(opt_udev) {
- usbmuxd_log(LL_INFO, "Caught SIGUSR1, checking if we can terminate (no more devices attached)...");
- if (device_get_count() > 0) {
- // we can't quit, there are still devices attached.
- usbmuxd_log(LL_NOTICE, "Refusing to terminate, there are still devices attached. Kill me with signal 15 (TERM) to force quit.");
- } else {
- // it's safe to quit
- should_exit = 1;
+ if (sig == SIGUSR1) {
+ usbmuxd_log(LL_INFO, "Caught SIGUSR1, checking if we can terminate (no more devices attached)...");
+ if (device_get_count() > 0) {
+ // we can't quit, there are still devices attached.
+ usbmuxd_log(LL_NOTICE, "Refusing to terminate, there are still devices attached. Kill me with signal 15 (TERM) to force quit.");
+ } else {
+ // it's safe to quit
+ should_exit = 1;
+ }
+ } else if (sig == SIGUSR2) {
+ usbmuxd_log(LL_INFO, "Caught SIGUSR2, scheduling device discovery");
+ should_discover = 1;
}
} else {
- usbmuxd_log(LL_INFO, "Caught SIGUSR1 but we weren't started in --udev mode, ignoring");
+ usbmuxd_log(LL_INFO, "Caught SIGUSR1/2 but we weren't started in --udev mode, ignoring");
}
}
}
@@ -124,6 +130,7 @@ void set_signal_handlers(void)
sigaction(SIGQUIT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGUSR1, &sa, NULL);
+ sigaction(SIGUSR2, &sa, NULL);
}
int main_loop(int listenfd)
@@ -150,10 +157,17 @@ int main_loop(int listenfd)
usbmuxd_log(LL_FLOOD, "poll() returned %d", cnt);
if(cnt == -1) {
- if(errno == EINTR && should_exit) {
- usbmuxd_log(LL_INFO, "event processing interrupted");
- fdlist_free(&pollfds);
- return 0;
+ if(errno == EINTR) {
+ if(should_exit) {
+ usbmuxd_log(LL_INFO, "event processing interrupted");
+ fdlist_free(&pollfds);
+ return 0;
+ }
+ if(should_discover) {
+ should_discover = 0;
+ usbmuxd_log(LL_INFO, "device discovery triggered by udev");
+ usb_discover();
+ }
}
} else if(cnt == 0) {
if(usb_process() < 0) {
@@ -391,6 +405,7 @@ int main(int argc, char *argv[])
usbmuxd_log(LL_NOTICE, "usbmux v%s starting up", USBMUXD_VERSION);
should_exit = 0;
+ should_discover = 0;
set_signal_handlers();
@@ -425,8 +440,18 @@ int main(int argc, char *argv[])
usbmuxd_log(LL_ERROR, "Another instance is already running (pid %d). exiting.", lock.l_pid);
res = -1;
} else {
- usbmuxd_log(LL_NOTICE, "Another instance is already running (pid %d). exiting.", lock.l_pid);
- res = 0;
+ usbmuxd_log(LL_NOTICE, "Another instance is already running (pid %d). Telling it to check for devices.", lock.l_pid);
+ if (lock.l_pid && !kill(lock.l_pid, 0)) {
+ usbmuxd_log(LL_NOTICE, "Sending signal SIGUSR2 to instance with pid %d", lock.l_pid);
+ res = 0;
+ if (kill(lock.l_pid, SIGUSR2) < 0) {
+ usbmuxd_log(LL_FATAL, "Could not deliver SIGUSR2 to pid %d", lock.l_pid);
+ res = -1;
+ }
+ } else {
+ usbmuxd_log(LL_ERROR, "Could not determine pid of the other running instance!");
+ res = -1;
+ }
}
goto terminate;
}
@@ -523,6 +548,9 @@ int main(int argc, char *argv[])
if((res = notify_parent(0)) < 0)
goto terminate;
+ if(opt_udev)
+ usb_autodiscover(0); // discovery triggered by udev
+
res = main_loop(listenfd);
if(res < 0)
usbmuxd_log(LL_FATAL, "main_loop failed");