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log.c: protect logging facility with a mutex

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since the write syscall is used instead of stdio, accesses have been
safe already, but it's better to use a mutex anyway to prevent out-
of-order writes.
This commit is contained in:
rofl0r 2018-12-18 23:48:57 +00:00 committed by rofl0r
parent b09d8d927d
commit fa2ad0cf9a
1 changed files with 11 additions and 0 deletions
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11
src/log.c
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@ -29,6 +29,7 @@
#include "utils.h"
#include "vector.h"
#include "conf.h"
#include <pthread.h>
static const char *syslog_level[] = {
NULL,
@ -45,6 +46,8 @@ static const char *syslog_level[] = {
#define TIME_LENGTH 16
#define STRING_LENGTH 800
static pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Global file descriptor for the log file
*/
@ -165,12 +168,14 @@ void log_message (int level, const char *fmt, ...)
goto out;
if (config.syslog) {
pthread_mutex_lock(&log_mutex);
#ifdef HAVE_VSYSLOG_H
vsyslog (level, fmt, args);
#else
vsnprintf (str, STRING_LENGTH, fmt, args);
syslog (level, "%s", str);
#endif
pthread_mutex_unlock(&log_mutex);
} else {
char *p;
@ -196,7 +201,10 @@ void log_message (int level, const char *fmt, ...)
assert (log_file_fd >= 0);
pthread_mutex_lock(&log_mutex);
ret = write (log_file_fd, str, strlen (str));
pthread_mutex_unlock(&log_mutex);
if (ret == -1) {
config.syslog = TRUE;
@ -207,7 +215,10 @@ void log_message (int level, const char *fmt, ...)
"Falling back to syslog logging");
}
pthread_mutex_lock(&log_mutex);
fsync (log_file_fd);
pthread_mutex_unlock(&log_mutex);
}
out: