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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[2];
- 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|SOCK_CLOEXEC, 0);
- }
- 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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