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33 * @(#)syslog.c 8.5 (Berkeley) 4/29/95
34 * $FreeBSD: src/lib/libc/gen/syslog.c,v 1.21.2.3 2002/11/18 11:49:55 ru Exp $
35 * $DragonFly: src/lib/libcr/gen/Attic/syslog.c,v 1.2 2003/06/17 04:26:42 dillon Exp $
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <sys/syslog.h>
59 static int LogFile = -1; /* fd for log */
60 static int connected; /* have done connect */
61 static int opened; /* have done openlog() */
62 static int LogStat = 0; /* status bits, set by openlog() */
63 static const char *LogTag = NULL; /* string to tag the entry with */
64 static int LogFacility = LOG_USER; /* default facility code */
65 static int LogMask = 0xff; /* mask of priorities to be logged */
66 extern char *__progname; /* Program name, from crt0. */
68 static void disconnectlog __P((void)); /* disconnect from syslogd */
69 static void connectlog __P((void)); /* (re)connect to syslogd */
72 * Format of the magic cookie passed through the stdio hook
75 char *base; /* start of buffer */
80 * stdio write hook for writing to a static string buffer
81 * XXX: Maybe one day, dynamically allocate it so that the line length
85 int writehook(cookie, buf, len)
86 void *cookie; /* really [struct bufcookie *] */
87 char *buf; /* characters to copy */
88 int len; /* length to copy */
90 struct bufcookie *h; /* private `handle' */
92 h = (struct bufcookie *)cookie;
94 /* clip in case of wraparound */
98 (void)memcpy(h->base, buf, len); /* `write' it. */
107 * print message on log file; output is intended for syslogd(8).
111 syslog(int pri, const char *fmt, ...)
113 syslog(pri, fmt, va_alist)
126 vsyslog(pri, fmt, ap);
131 vsyslog(pri, fmt, ap)
133 register const char *fmt;
137 register char ch, *p;
140 char *stdp, tbuf[2048], fmt_cpy[1024], timbuf[26];
142 struct bufcookie tbuf_cookie;
143 struct bufcookie fmt_cookie;
145 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
146 /* Check for invalid bits. */
147 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
149 "syslog: unknown facility/priority: %x", pri);
150 pri &= LOG_PRIMASK|LOG_FACMASK;
153 /* Check priority against setlogmask values. */
154 if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
159 /* Set default facility if none specified. */
160 if ((pri & LOG_FACMASK) == 0)
163 /* Create the primary stdio hook */
164 tbuf_cookie.base = tbuf;
165 tbuf_cookie.left = sizeof(tbuf);
166 fp = fwopen(&tbuf_cookie, writehook);
170 /* Build the message. */
172 (void)fprintf(fp, "<%d>", pri);
173 (void)fprintf(fp, "%.15s ", ctime_r(&now, timbuf) + 4);
174 if (LogStat & LOG_PERROR) {
175 /* Transfer to string buffer */
177 stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left);
182 (void)fprintf(fp, "%s", LogTag);
183 if (LogStat & LOG_PID)
184 (void)fprintf(fp, "[%d]", getpid());
185 if (LogTag != NULL) {
186 (void)fprintf(fp, ": ");
189 /* Check to see if we can skip expanding the %m */
190 if (strstr(fmt, "%m")) {
192 /* Create the second stdio hook */
193 fmt_cookie.base = fmt_cpy;
194 fmt_cookie.left = sizeof(fmt_cpy) - 1;
195 fmt_fp = fwopen(&fmt_cookie, writehook);
196 if (fmt_fp == NULL) {
201 /* Substitute error message for %m. */
202 for ( ; (ch = *fmt); ++fmt)
203 if (ch == '%' && fmt[1] == 'm') {
205 fputs(strerror(saved_errno), fmt_fp);
209 /* Null terminate if room */
213 /* Guarantee null termination */
214 fmt_cpy[sizeof(fmt_cpy) - 1] = '\0';
219 (void)vfprintf(fp, fmt, ap);
222 cnt = sizeof(tbuf) - tbuf_cookie.left;
224 /* Output to stderr if requested. */
225 if (LogStat & LOG_PERROR) {
227 register struct iovec *v = iov;
230 v->iov_len = cnt - (stdp - tbuf);
234 (void)writev(STDERR_FILENO, iov, 2);
237 /* Get connected, output the message to the local logger. */
239 openlog(LogTag, LogStat | LOG_NDELAY, 0);
241 if (send(LogFile, tbuf, cnt, 0) >= 0)
245 * If the send() failed, the odds are syslogd was restarted.
246 * Make one (only) attempt to reconnect to /dev/log.
250 if (send(LogFile, tbuf, cnt, 0) >= 0)
254 * Output the message to the console; try not to block
255 * as a blocking console should not stop other processes.
256 * Make sure the error reported is the one from the syslogd failure.
258 if (LogStat & LOG_CONS &&
259 (fd = _open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
261 register struct iovec *v = iov;
263 p = strchr(tbuf, '>') + 1;
265 v->iov_len = cnt - (p - tbuf);
267 v->iov_base = "\r\n";
269 (void)writev(fd, iov, 2);
277 * If the user closed the FD and opened another in the same slot,
278 * that's their problem. They should close it before calling on
285 connected = 0; /* retry connect */
291 struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
294 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
296 (void)_fcntl(LogFile, F_SETFD, 1);
298 if (LogFile != -1 && !connected) {
299 SyslogAddr.sun_len = sizeof(SyslogAddr);
300 SyslogAddr.sun_family = AF_UNIX;
301 (void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
302 sizeof SyslogAddr.sun_path);
303 connected = connect(LogFile, (struct sockaddr *)&SyslogAddr,
304 sizeof(SyslogAddr)) != -1;
308 * Try the old "/dev/log" path, for backward
311 (void)strncpy(SyslogAddr.sun_path, _PATH_OLDLOG,
312 sizeof SyslogAddr.sun_path);
313 connected = connect(LogFile,
314 (struct sockaddr *)&SyslogAddr,
315 sizeof(SyslogAddr)) != -1;
319 (void)_close(LogFile);
326 openlog(ident, logstat, logfac)
333 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
334 LogFacility = logfac;
336 if (LogStat & LOG_NDELAY) /* open immediately */
339 opened = 1; /* ident and facility has been set */
345 (void)_close(LogFile);
351 /* setlogmask -- set the log mask level */