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#include <stdarg.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
#include <syslog.h>
#include <time.h>
#include <signal.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
#include <fcntl.h>
#include "lock.h"
static volatile int lock[1];
static char log_ident[32];
static int log_opt;
static int log_facility = LOG_USER;
static int log_mask = 0xff;
static int log_fd = -1;
int setlogmask(int maskpri)
{
LOCK(lock);
int ret = log_mask;
if (maskpri) log_mask = maskpri;
UNLOCK(lock);
return ret;
}
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()
{
log_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
if (log_fd >= 0) connect(log_fd, (void *)&log_addr, sizeof log_addr);
}
void openlog(const char *ident, int opt, int facility)
{
int cs;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
LOCK(lock);
if (ident) {
size_t n = strnlen(ident, sizeof log_ident - 1);
memcpy(log_ident, ident, n);
log_ident[n] = 0;
} else {
log_ident[0] = 0;
}
log_opt = opt;
log_facility = facility;
if ((opt & LOG_NDELAY) && log_fd<0) __openlog();
UNLOCK(lock);
pthread_setcancelstate(cs, 0);
}
static int is_lost_conn(int e)
{
return e==ECONNREFUSED || e==ECONNRESET || e==ENOTCONN || e==EPIPE;
}
static void _vsyslog(int priority, const char *message, va_list ap)
{
char timebuf[16];
time_t now;
struct tm tm;
char buf[1024];
int errno_save = errno;
int pid;
int l, l2;
int hlen;
int fd;
if (log_fd < 0) __openlog();
if (!(priority & LOG_FACMASK)) priority |= log_facility;
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 %n%s%s%.0d%s: ",
priority, timebuf, &hlen, log_ident, "["+!pid, pid, "]"+!pid);
errno = errno_save;
l2 = vsnprintf(buf+l, sizeof buf - l, message, ap);
if (l2 >= 0) {
if (l2 >= sizeof buf - l) l = sizeof buf - 1;
else l += l2;
if (buf[l-1] != '\n') buf[l++] = '\n';
if (send(log_fd, buf, l, 0) < 0 && (!is_lost_conn(errno)
|| connect(log_fd, (void *)&log_addr, sizeof log_addr) < 0
|| send(log_fd, buf, l, 0) < 0)
&& (log_opt & LOG_CONS)) {
fd = open("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd >= 0) {
dprintf(fd, "%.*s", l-hlen, buf+hlen);
close(fd);
}
}
if (log_opt & LOG_PERROR) dprintf(2, "%.*s", l-hlen, buf+hlen);
}
}
static 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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