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#include <stdarg.h>
#include <sys/socket.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include <time.h>
#include <signal.h>
#include <string.h>
#include <pthread.h>
#include "libc.h"
static int lock;
static const char *log_ident;
static int log_opt;
static int log_facility = LOG_USER;
static int log_mask = 0xff;
static int log_fd = -1;
int setlogmask(int maskpri)
{
int old = log_mask;
if (maskpri) log_mask = maskpri;
return old;
}
static const struct {
short sun_family;
char sun_path[9];
} log_addr = {
AF_UNIX,
"/dev/log"
};
void closelog(void)
{
int cs;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
LOCK(&lock);
close(log_fd);
log_fd = -1;
UNLOCK(&lock);
pthread_setcancelstate(cs, 0);
}
static void __openlog(const char *ident, int opt, int facility)
{
log_ident = ident;
log_opt = opt;
log_facility = facility;
if (!(opt & LOG_NDELAY) || log_fd>=0) return;
log_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
fcntl(log_fd, F_SETFD, FD_CLOEXEC);
}
void openlog(const char *ident, int opt, int facility)
{
int cs;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
LOCK(&lock);
__openlog(ident, opt, facility);
UNLOCK(&lock);
pthread_setcancelstate(cs, 0);
}
static void _vsyslog(int priority, const char *message, va_list ap)
{
char timebuf[16];
time_t now;
struct tm tm;
char buf[256];
int pid;
int l, l2;
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);
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 __vsyslog(int priority, const char *message, va_list ap)
{
int cs;
if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
LOCK(&lock);
_vsyslog(priority, message, ap);
UNLOCK(&lock);
pthread_setcancelstate(cs, 0);
}
void syslog(int priority, const char *message, ...)
{
va_list ap;
va_start(ap, message);
__vsyslog(priority, message, ap);
va_end(ap);
}
weak_alias(__vsyslog, vsyslog);
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