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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/libc/gen/syslog.c,v 1.9 2005/11/19 22:32:53 swildner Exp $
38 #include "namespace.h"
39 #include <sys/types.h>
40 #include <sys/socket.h>
41 #include <sys/syslog.h>
54 #include "un-namespace.h"
58 static int LogFile = -1; /* fd for log */
59 static int connected; /* have done connect */
60 static int opened; /* have done openlog() */
61 static int LogStat = 0; /* status bits, set by openlog() */
62 static const char *LogTag = NULL; /* string to tag the entry with */
63 static int LogFacility = LOG_USER; /* default facility code */
64 static int LogMask = 0xff; /* mask of priorities to be logged */
66 static void disconnectlog (void); /* disconnect from syslogd */
67 static void connectlog (void); /* (re)connect to syslogd */
70 * Format of the magic cookie passed through the stdio hook
73 char *base; /* start of buffer */
78 * stdio write hook for writing to a static string buffer
79 * XXX: Maybe one day, dynamically allocate it so that the line length
83 writehook(void *cookie, const char *buf, int len)
85 struct bufcookie *h; /* private `handle' */
87 h = (struct bufcookie *)cookie;
89 /* clip in case of wraparound */
93 memcpy(h->base, buf, len); /* `write' it. */
102 * print message on log file; output is intended for syslogd(8).
105 syslog(int pri, const char *fmt, ...)
110 vsyslog(pri, fmt, ap);
115 vsyslog(int pri, const char *fmt, va_list ap)
121 char *stdp, tbuf[2048], fmt_cpy[1024], timbuf[26];
123 struct bufcookie tbuf_cookie;
124 struct bufcookie fmt_cookie;
128 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
129 /* Check for invalid bits. */
130 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
132 "syslog: unknown facility/priority: %x", pri);
133 pri &= LOG_PRIMASK|LOG_FACMASK;
136 /* Check priority against setlogmask values. */
137 if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
142 /* Set default facility if none specified. */
143 if ((pri & LOG_FACMASK) == 0)
146 /* Create the primary stdio hook */
147 tbuf_cookie.base = tbuf;
148 tbuf_cookie.left = sizeof(tbuf);
149 fp = fwopen(&tbuf_cookie, writehook);
153 /* Build the message. */
155 fprintf(fp, "<%d>", pri);
156 fprintf(fp, "%.15s ", ctime_r(&now, timbuf) + 4);
157 if (LogStat & LOG_PERROR) {
158 /* Transfer to string buffer */
160 stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left);
163 LogTag = getprogname();
165 fprintf(fp, "%s", LogTag);
166 if (LogStat & LOG_PID)
167 fprintf(fp, "[%d]", getpid());
168 if (LogTag != NULL) {
172 /* Check to see if we can skip expanding the %m */
173 if (strstr(fmt, "%m")) {
175 /* Create the second stdio hook */
176 fmt_cookie.base = fmt_cpy;
177 fmt_cookie.left = sizeof(fmt_cpy) - 1;
178 fmt_fp = fwopen(&fmt_cookie, writehook);
179 if (fmt_fp == NULL) {
184 /* Substitute error message for %m. */
185 for ( ; (ch = *fmt); ++fmt)
186 if (ch == '%' && fmt[1] == 'm') {
188 fputs(strerror(saved_errno), fmt_fp);
192 /* Null terminate if room */
196 /* Guarantee null termination */
197 fmt_cpy[sizeof(fmt_cpy) - 1] = '\0';
202 vfprintf(fp, fmt, ap);
205 cnt = sizeof(tbuf) - tbuf_cookie.left;
207 /* Output to stderr if requested. */
208 if (LogStat & LOG_PERROR) {
210 struct iovec *v = iov;
213 v->iov_len = cnt - (stdp - tbuf);
217 _writev(STDERR_FILENO, iov, 2);
220 /* Get connected, output the message to the local logger. */
222 openlog(LogTag, LogStat | LOG_NDELAY, 0);
224 if (send(LogFile, tbuf, cnt, 0) >= 0)
228 * If the send() failed, the odds are syslogd was restarted.
229 * Make one (only) attempt to reconnect to /dev/log.
233 if (send(LogFile, tbuf, cnt, 0) >= 0)
237 * Output the message to the console; try not to block
238 * as a blocking console should not stop other processes.
239 * Make sure the error reported is the one from the syslogd failure.
241 if (LogStat & LOG_CONS &&
242 (fd = _open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
244 struct iovec *v = iov;
246 p = strchr(tbuf, '>') + 1;
248 v->iov_len = cnt - (p - tbuf);
250 v->iov_base = "\r\n";
260 * If the user closed the FD and opened another in the same slot,
261 * that's their problem. They should close it before calling on
268 connected = 0; /* retry connect */
274 struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
277 if ((LogFile = _socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
279 _fcntl(LogFile, F_SETFD, 1);
281 if (LogFile != -1 && !connected) {
282 SyslogAddr.sun_len = sizeof(SyslogAddr);
283 SyslogAddr.sun_family = AF_UNIX;
284 strncpy(SyslogAddr.sun_path, _PATH_LOG,
285 sizeof SyslogAddr.sun_path);
286 connected = _connect(LogFile, (struct sockaddr *)&SyslogAddr,
287 sizeof(SyslogAddr)) != -1;
291 * Try the old "/dev/log" path, for backward
294 strncpy(SyslogAddr.sun_path, _PATH_OLDLOG,
295 sizeof SyslogAddr.sun_path);
296 connected = _connect(LogFile,
297 (struct sockaddr *)&SyslogAddr,
298 sizeof(SyslogAddr)) != -1;
309 openlog(const char *ident, int logstat, int logfac)
314 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
315 LogFacility = logfac;
317 if (LogStat & LOG_NDELAY) /* open immediately */
320 opened = 1; /* ident and facility has been set */
332 /* setlogmask -- set the log mask level */
334 setlogmask(int pmask)