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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 "libc.h"
- #include "atomic.h"
- static int lock[2];
- 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)
- {
- if (maskpri) return a_swap(&log_mask, maskpri);
- else return log_mask;
- }
- 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 void _vsyslog(int priority, const char *message, va_list ap)
- {
- char timebuf[16];
- time_t now;
- struct tm tm;
- char buf[256];
- 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 && (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);
- }
- }
- 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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