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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 1.7 2005/03/09 18:52:21 joerg 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 int writehook(cookie, buf, len)
84 void *cookie; /* really [struct bufcookie *] */
85 char *buf; /* characters to copy */
86 int len; /* length to copy */
88 struct bufcookie *h; /* private `handle' */
90 h = (struct bufcookie *)cookie;
92 /* clip in case of wraparound */
96 (void)memcpy(h->base, buf, len); /* `write' it. */
105 * print message on log file; output is intended for syslogd(8).
108 syslog(int pri, const char *fmt, ...)
113 vsyslog(pri, fmt, ap);
118 vsyslog(pri, fmt, ap)
127 char *stdp, tbuf[2048], fmt_cpy[1024], timbuf[26];
129 struct bufcookie tbuf_cookie;
130 struct bufcookie fmt_cookie;
132 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
133 /* Check for invalid bits. */
134 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
136 "syslog: unknown facility/priority: %x", pri);
137 pri &= LOG_PRIMASK|LOG_FACMASK;
140 /* Check priority against setlogmask values. */
141 if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
146 /* Set default facility if none specified. */
147 if ((pri & LOG_FACMASK) == 0)
150 /* Create the primary stdio hook */
151 tbuf_cookie.base = tbuf;
152 tbuf_cookie.left = sizeof(tbuf);
153 fp = fwopen(&tbuf_cookie, writehook);
157 /* Build the message. */
159 (void)fprintf(fp, "<%d>", pri);
160 (void)fprintf(fp, "%.15s ", ctime_r(&now, timbuf) + 4);
161 if (LogStat & LOG_PERROR) {
162 /* Transfer to string buffer */
164 stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left);
167 LogTag = getprogname();
169 (void)fprintf(fp, "%s", LogTag);
170 if (LogStat & LOG_PID)
171 (void)fprintf(fp, "[%d]", getpid());
172 if (LogTag != NULL) {
173 (void)fprintf(fp, ": ");
176 /* Check to see if we can skip expanding the %m */
177 if (strstr(fmt, "%m")) {
179 /* Create the second stdio hook */
180 fmt_cookie.base = fmt_cpy;
181 fmt_cookie.left = sizeof(fmt_cpy) - 1;
182 fmt_fp = fwopen(&fmt_cookie, writehook);
183 if (fmt_fp == NULL) {
188 /* Substitute error message for %m. */
189 for ( ; (ch = *fmt); ++fmt)
190 if (ch == '%' && fmt[1] == 'm') {
192 fputs(strerror(saved_errno), fmt_fp);
196 /* Null terminate if room */
200 /* Guarantee null termination */
201 fmt_cpy[sizeof(fmt_cpy) - 1] = '\0';
206 (void)vfprintf(fp, fmt, ap);
209 cnt = sizeof(tbuf) - tbuf_cookie.left;
211 /* Output to stderr if requested. */
212 if (LogStat & LOG_PERROR) {
214 struct iovec *v = iov;
217 v->iov_len = cnt - (stdp - tbuf);
221 (void)_writev(STDERR_FILENO, iov, 2);
224 /* Get connected, output the message to the local logger. */
226 openlog(LogTag, LogStat | LOG_NDELAY, 0);
228 if (send(LogFile, tbuf, cnt, 0) >= 0)
232 * If the send() failed, the odds are syslogd was restarted.
233 * Make one (only) attempt to reconnect to /dev/log.
237 if (send(LogFile, tbuf, cnt, 0) >= 0)
241 * Output the message to the console; try not to block
242 * as a blocking console should not stop other processes.
243 * Make sure the error reported is the one from the syslogd failure.
245 if (LogStat & LOG_CONS &&
246 (fd = _open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
248 struct iovec *v = iov;
250 p = strchr(tbuf, '>') + 1;
252 v->iov_len = cnt - (p - tbuf);
254 v->iov_base = "\r\n";
256 (void)_writev(fd, iov, 2);
264 * If the user closed the FD and opened another in the same slot,
265 * that's their problem. They should close it before calling on
272 connected = 0; /* retry connect */
278 struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
281 if ((LogFile = _socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
283 (void)_fcntl(LogFile, F_SETFD, 1);
285 if (LogFile != -1 && !connected) {
286 SyslogAddr.sun_len = sizeof(SyslogAddr);
287 SyslogAddr.sun_family = AF_UNIX;
288 (void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
289 sizeof SyslogAddr.sun_path);
290 connected = _connect(LogFile, (struct sockaddr *)&SyslogAddr,
291 sizeof(SyslogAddr)) != -1;
295 * Try the old "/dev/log" path, for backward
298 (void)strncpy(SyslogAddr.sun_path, _PATH_OLDLOG,
299 sizeof SyslogAddr.sun_path);
300 connected = _connect(LogFile,
301 (struct sockaddr *)&SyslogAddr,
302 sizeof(SyslogAddr)) != -1;
306 (void)_close(LogFile);
313 openlog(ident, logstat, logfac)
320 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
321 LogFacility = logfac;
323 if (LogStat & LOG_NDELAY) /* open immediately */
326 opened = 1; /* ident and facility has been set */
332 (void)_close(LogFile);
338 /* setlogmask -- set the log mask level */