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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 1.5 2004/07/27 10:20:21 asmodai Exp $
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <sys/syslog.h>
55 static int LogFile = -1; /* fd for log */
56 static int connected; /* have done connect */
57 static int opened; /* have done openlog() */
58 static int LogStat = 0; /* status bits, set by openlog() */
59 static const char *LogTag = NULL; /* string to tag the entry with */
60 static int LogFacility = LOG_USER; /* default facility code */
61 static int LogMask = 0xff; /* mask of priorities to be logged */
62 extern char *__progname; /* Program name, from crt0. */
64 static void disconnectlog (void); /* disconnect from syslogd */
65 static void connectlog (void); /* (re)connect to syslogd */
68 * Format of the magic cookie passed through the stdio hook
71 char *base; /* start of buffer */
76 * stdio write hook for writing to a static string buffer
77 * XXX: Maybe one day, dynamically allocate it so that the line length
81 int writehook(cookie, buf, len)
82 void *cookie; /* really [struct bufcookie *] */
83 char *buf; /* characters to copy */
84 int len; /* length to copy */
86 struct bufcookie *h; /* private `handle' */
88 h = (struct bufcookie *)cookie;
90 /* clip in case of wraparound */
94 (void)memcpy(h->base, buf, len); /* `write' it. */
103 * print message on log file; output is intended for syslogd(8).
106 syslog(int pri, const char *fmt, ...)
111 vsyslog(pri, fmt, ap);
116 vsyslog(pri, fmt, ap)
125 char *stdp, tbuf[2048], fmt_cpy[1024], timbuf[26];
127 struct bufcookie tbuf_cookie;
128 struct bufcookie fmt_cookie;
130 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
131 /* Check for invalid bits. */
132 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
134 "syslog: unknown facility/priority: %x", pri);
135 pri &= LOG_PRIMASK|LOG_FACMASK;
138 /* Check priority against setlogmask values. */
139 if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
144 /* Set default facility if none specified. */
145 if ((pri & LOG_FACMASK) == 0)
148 /* Create the primary stdio hook */
149 tbuf_cookie.base = tbuf;
150 tbuf_cookie.left = sizeof(tbuf);
151 fp = fwopen(&tbuf_cookie, writehook);
155 /* Build the message. */
157 (void)fprintf(fp, "<%d>", pri);
158 (void)fprintf(fp, "%.15s ", ctime_r(&now, timbuf) + 4);
159 if (LogStat & LOG_PERROR) {
160 /* Transfer to string buffer */
162 stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left);
167 (void)fprintf(fp, "%s", LogTag);
168 if (LogStat & LOG_PID)
169 (void)fprintf(fp, "[%d]", getpid());
170 if (LogTag != NULL) {
171 (void)fprintf(fp, ": ");
174 /* Check to see if we can skip expanding the %m */
175 if (strstr(fmt, "%m")) {
177 /* Create the second stdio hook */
178 fmt_cookie.base = fmt_cpy;
179 fmt_cookie.left = sizeof(fmt_cpy) - 1;
180 fmt_fp = fwopen(&fmt_cookie, writehook);
181 if (fmt_fp == NULL) {
186 /* Substitute error message for %m. */
187 for ( ; (ch = *fmt); ++fmt)
188 if (ch == '%' && fmt[1] == 'm') {
190 fputs(strerror(saved_errno), fmt_fp);
194 /* Null terminate if room */
198 /* Guarantee null termination */
199 fmt_cpy[sizeof(fmt_cpy) - 1] = '\0';
204 (void)vfprintf(fp, fmt, ap);
207 cnt = sizeof(tbuf) - tbuf_cookie.left;
209 /* Output to stderr if requested. */
210 if (LogStat & LOG_PERROR) {
212 struct iovec *v = iov;
215 v->iov_len = cnt - (stdp - tbuf);
219 (void)writev(STDERR_FILENO, iov, 2);
222 /* Get connected, output the message to the local logger. */
224 openlog(LogTag, LogStat | LOG_NDELAY, 0);
226 if (send(LogFile, tbuf, cnt, 0) >= 0)
230 * If the send() failed, the odds are syslogd was restarted.
231 * Make one (only) attempt to reconnect to /dev/log.
235 if (send(LogFile, tbuf, cnt, 0) >= 0)
239 * Output the message to the console; try not to block
240 * as a blocking console should not stop other processes.
241 * Make sure the error reported is the one from the syslogd failure.
243 if (LogStat & LOG_CONS &&
244 (fd = _open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
246 struct iovec *v = iov;
248 p = strchr(tbuf, '>') + 1;
250 v->iov_len = cnt - (p - tbuf);
252 v->iov_base = "\r\n";
254 (void)writev(fd, iov, 2);
262 * If the user closed the FD and opened another in the same slot,
263 * that's their problem. They should close it before calling on
270 connected = 0; /* retry connect */
276 struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
279 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
281 (void)_fcntl(LogFile, F_SETFD, 1);
283 if (LogFile != -1 && !connected) {
284 SyslogAddr.sun_len = sizeof(SyslogAddr);
285 SyslogAddr.sun_family = AF_UNIX;
286 (void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
287 sizeof SyslogAddr.sun_path);
288 connected = connect(LogFile, (struct sockaddr *)&SyslogAddr,
289 sizeof(SyslogAddr)) != -1;
293 * Try the old "/dev/log" path, for backward
296 (void)strncpy(SyslogAddr.sun_path, _PATH_OLDLOG,
297 sizeof SyslogAddr.sun_path);
298 connected = connect(LogFile,
299 (struct sockaddr *)&SyslogAddr,
300 sizeof(SyslogAddr)) != -1;
304 (void)_close(LogFile);
311 openlog(ident, logstat, logfac)
318 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
319 LogFacility = logfac;
321 if (LogStat & LOG_NDELAY) /* open immediately */
324 opened = 1; /* ident and facility has been set */
330 (void)_close(LogFile);
336 /* setlogmask -- set the log mask level */