49 lines
1.7 KiB
Diff
49 lines
1.7 KiB
Diff
From f173657bccae4dd0cbfe0a7ed33ebc9117b74f05 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Wed, 24 Jul 2013 07:24:05 +0200
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Subject: [PATCH] core: synchronously block when logging
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Previously, the logging sockets were asynchronous and if clogged we'd
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lose messages. We did this to be extra careful given that PID 1 might
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need to spawn the logging daemon as response to PID 1's own log messages
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and we really should avoid a deadlock in that case.
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As it turns out this causes loss of too many messages, hence make the
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socket blocking again, however put a time limit on it to avoid unbounded
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deadlocks in the unlikely case they happen.
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https://bugs.freedesktop.org/show_bug.cgi?id=66664
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---
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src/shared/log.c | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/src/shared/log.c b/src/shared/log.c
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index 27317f7..8f4995a 100644
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--- a/src/shared/log.c
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+++ b/src/shared/log.c
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@@ -115,16 +115,20 @@ void log_close_syslog(void) {
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static int create_log_socket(int type) {
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int fd;
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+ struct timeval tv;
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- /* All output to the syslog/journal fds we do asynchronously,
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- * and if the buffers are full we just drop the messages */
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-
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- fd = socket(AF_UNIX, type|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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+ fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0);
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if (fd < 0)
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return -errno;
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fd_inc_sndbuf(fd, SNDBUF_SIZE);
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+ /* We need a blocking fd here since we'd otherwise lose
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+ messages way too early. However, let's not hang forever in the
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+ unlikely case of a deadlock. */
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+ timeval_store(&tv, 1*USEC_PER_MINUTE);
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+ setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
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+
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return fd;
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}
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