#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 <errno.h>
+#include <fcntl.h>
#include "libc.h"
-static int lock;
-static const char *log_ident;
+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;
int setlogmask(int maskpri)
{
- int old = log_mask;
+ LOCK(lock);
+ int ret = log_mask;
if (maskpri) log_mask = maskpri;
- return old;
+ UNLOCK(lock);
+ return ret;
}
static const struct {
{
int cs;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
- LOCK(&lock);
+ LOCK(lock);
close(log_fd);
log_fd = -1;
- UNLOCK(&lock);
+ UNLOCK(lock);
pthread_setcancelstate(cs, 0);
}
-static void __openlog(const char *ident, int opt, int facility)
+static void __openlog()
{
- 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);
+ 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);
- __openlog(ident, opt, facility);
- UNLOCK(&lock);
+ 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[256];
+ char buf[1024];
+ int errno_save = errno;
int pid;
int l, l2;
+ int hlen;
+ int fd;
- if (log_fd < 0) {
- __openlog(log_ident, log_opt | LOG_NDELAY, log_facility);
- if (log_fd < 0) {
- UNLOCK(&lock);
- return;
- }
- }
+ 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 %s%s%.0d%s: ",
- priority, timebuf,
- log_ident ? log_ident : "",
- "["+!pid, pid, "]"+!pid);
+ 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) {
- l += l2;
+ if (l2 >= sizeof buf - l) l = sizeof buf - 1;
+ else l += l2;
if (buf[l-1] != '\n') buf[l++] = '\n';
- sendto(log_fd, buf, l, 0, (void *)&log_addr, 11);
+ 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);
}
-
- 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);
+ LOCK(lock);
_vsyslog(priority, message, ap);
- UNLOCK(&lock);
+ UNLOCK(lock);
pthread_setcancelstate(cs, 0);
}