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log: never block on syslog in PID 1

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Use a non-blocking syslog socket if logging from PID 1.
If sendmsg fails with EAGAIN, fall back to kmsg or console only for the
current message. Next message will try syslog again.
This commit is contained in:
Michal Schmidt
2011-12-20 00:23:51 +01:00
parent 9721b19968
commit 8f7f7a1bd3
1 changed files with 16 additions and 7 deletions
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src/log.c
+16 -7
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@@ -118,6 +118,9 @@ static int create_log_socket(int type) {
struct timeval tv;
int fd;
if (getpid() == 1)
/* systemd should not block on syslog */
type |= SOCK_NONBLOCK;
if ((fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0)) < 0)
return -errno;
@@ -330,7 +333,8 @@ static int write_to_syslog(
for (;;) {
ssize_t n;
if ((n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL)) < 0)
n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL);
if (n < 0)
return -errno;
if (!syslog_is_stream ||
@@ -407,8 +411,10 @@ static int log_dispatch(
log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_SYSLOG) {
if ((k = write_to_syslog(level, file, line, func, buffer)) < 0) {
log_close_syslog();
k = write_to_syslog(level, file, line, func, buffer);
if (k < 0) {
if (k != -EAGAIN)
log_close_syslog();
log_open_kmsg();
} else if (k > 0)
r++;
@@ -419,16 +425,19 @@ static int log_dispatch(
log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
log_target == LOG_TARGET_KMSG)) {
if ((k = write_to_kmsg(level, file, line, func, buffer)) < 0) {
k = write_to_kmsg(level, file, line, func, buffer);
if (k < 0) {
log_close_kmsg();
log_open_console();
} else if (k > 0)
r++;
}
if (k <= 0 &&
(k = write_to_console(level, file, line, func, buffer)) < 0)
return k;
if (k <= 0) {
k = write_to_console(level, file, line, func, buffer);
if (k < 0)
return k;
}
buffer = e;
} while (buffer);