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authorRich Felker <dalias@aerifal.cx>2011-04-13 18:32:33 -0400
committerRich Felker <dalias@aerifal.cx>2011-04-13 18:32:33 -0400
commit19c1830eaaab05652d87b5ee9557d0d7a40c2f06 (patch)
tree5bdefc4579fd5385349497748e5f3477472d2c13 /src/misc/syslog.c
parenta77411a50d22f6c9db305f19efda5ab2db3266de (diff)
downloadmusl-19c1830eaaab05652d87b5ee9557d0d7a40c2f06.tar.gz
simplify syslog, add vsyslog interface (nonstandard)
with datagram sockets, depending on fprintf not to flush the output early was very fragile; the new version simply uses a small fixed-size buffer. it could be updated to dynamic-allocate large buffers if needed, but i can't envision any admin being happy about finding 64kb-long lines in their syslog...
Diffstat (limited to 'src/misc/syslog.c')
-rw-r--r--src/misc/syslog.c67
1 files changed, 36 insertions, 31 deletions
diff --git a/src/misc/syslog.c b/src/misc/syslog.c
index de42ce25..0f757640 100644
--- a/src/misc/syslog.c
+++ b/src/misc/syslog.c
@@ -14,7 +14,7 @@ static const char *log_ident;
static int log_opt;
static int log_facility = LOG_USER;
static int log_mask = 0xff;
-static FILE *log_f;
+static int log_fd = -1;
int setlogmask(int maskpri)
{
@@ -34,26 +34,21 @@ static const struct {
void closelog(void)
{
LOCK(&lock);
- if (log_f) fclose(log_f);
- log_f = NULL;
+ close(log_fd);
+ log_fd = -1;
UNLOCK(&lock);
}
static void __openlog(const char *ident, int opt, int facility)
{
- int fd;
-
log_ident = ident;
log_opt = opt;
log_facility = facility;
- if (!(opt & LOG_NDELAY) || log_f) return;
+ if (!(opt & LOG_NDELAY) || log_fd>=0) return;
- fd = socket(AF_UNIX, SOCK_DGRAM, 0);
- fcntl(fd, F_SETFD, FD_CLOEXEC);
- if (connect(fd, (void *)&log_addr, sizeof(short) + sizeof "/dev/log") < 0)
- close(fd);
- else log_f = fdopen(fd, "wb");
+ log_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
+ fcntl(log_fd, F_SETFD, FD_CLOEXEC);
}
void openlog(const char *ident, int opt, int facility)
@@ -63,42 +58,52 @@ void openlog(const char *ident, int opt, int facility)
UNLOCK(&lock);
}
-void syslog(int priority, const char *message, ...)
+void __vsyslog(int priority, const char *message, va_list ap)
{
- va_list ap;
char timebuf[16];
time_t now;
struct tm tm;
- //const char *fmt, *ident, *sep;
- //int i;
+ char buf[256];
+ int pid;
+ int l, l2;
if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return;
LOCK(&lock);
- if (!log_f) __openlog(log_ident, log_opt | LOG_NDELAY, log_facility);
- if (!log_f) {
- UNLOCK(&lock);
- return;
+ if (log_fd < 0) {
+ __openlog(log_ident, log_opt | LOG_NDELAY, log_facility);
+ if (log_fd < 0) {
+ UNLOCK(&lock);
+ return;
+ }
}
now = time(NULL);
gmtime_r(&now, &tm);
strftime(timebuf, sizeof timebuf, "%b %e %T", &tm);
- fprintf(log_f, "<%d>%s ", priority, timebuf);
- if (log_ident) fprintf(log_f, "%s", log_ident);
- if (log_opt & LOG_PID) fprintf(log_f, "[%d]", getpid());
- if (log_ident) fprintf(log_f, ": ");
+ pid = (log_opt & LOG_PID) ? getpid() : 0;
+ l = snprintf(buf, sizeof buf, "<%d>%s %s%s%.0d%s: ",
+ priority, timebuf,
+ log_ident ? log_ident : "",
+ "["+!pid, pid, "]"+!pid);
+ l2 = vsnprintf(buf+l, sizeof buf - l, message, ap);
+ if (l2 >= 0) {
+ l += l2;
+ if (buf[l-1] != '\n') buf[l++] = '\n';
+ sendto(log_fd, buf, l, 0, (void *)&log_addr, 11);
+ }
+
+ UNLOCK(&lock);
+}
+void syslog(int priority, const char *message, ...)
+{
+ va_list ap;
va_start(ap, message);
- vfprintf(log_f, message, ap);
+ __vsyslog(priority, message, ap);
va_end(ap);
- fputc(0, log_f);
- fflush(log_f);
-
- // Note: LOG_CONS is not supported because it is annoying!!
- // syslogd will send messages to console if it deems them appropriate!
-
- UNLOCK(&lock);
}
+
+weak_alias(__vsyslog, vsyslog);