2 * Copyright (c) 1983, 1988, 1993
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35 * SYSLOG -- print message on log file
37 * This routine looks a lot like printf, except that it outputs to the
38 * log file instead of the standard output. Also:
40 * prints the module name in front of the message,
41 * has some other formatting types (or will sometime),
42 * adds a newline on the end of the message.
44 * The output of this routine is intended to be read by syslogd(8).
47 * Modified to use UNIX domain IPC by Ralph Campbell
48 * Patched March 12, 1996 by A. Ian Vogelesang <vogelesang@hdshq.com>
49 * - to correct the handling of message & format string truncation,
50 * - to visibly tag truncated records to facilitate
51 * investigation of such Bad Things with grep, and,
52 * - to correct the handling of case where "write"
53 * returns after writing only part of the message.
54 * Rewritten by Martin Mares <mj@atrey.karlin.mff.cuni.cz> on May 14, 1997
55 * - better buffer overrun checks.
56 * - special handling of "%m" removed as we use GNU sprintf which handles
58 * - Major code cleanup.
61 #include <sys/types.h>
62 #include <sys/socket.h>
64 #include <sys/signal.h>
65 #include <sys/syslog.h>
81 #include <bits/uClibc_mutex.h>
83 __UCLIBC_MUTEX_STATIC(mylock, PTHREAD_MUTEX_INITIALIZER);
86 /* !glibc_compat: glibc uses argv[0] by default
87 * (default: if there was no openlog or if openlog passed NULL),
90 static const char *LogTag = "syslog"; /* string to tag the entry with */
91 static int LogFile = -1; /* fd for log */
92 static smalluint connected; /* have done connect */
93 /* all bits in option argument for openlog fit in 8 bits */
94 static smalluint LogStat = 0; /* status bits, set by openlog */
95 /* default facility code if openlog is not called */
96 /* (this fits in 8 bits even without >> 3 shift, but playing extra safe) */
97 static smalluint LogFacility = LOG_USER >> 3;
98 /* bits mask of priorities to be logged (eight prios - 8 bits is enough) */
99 static smalluint LogMask = 0xff;
100 /* AF_UNIX address of local logger (we use struct sockaddr
101 * instead of struct sockaddr_un since "/dev/log" is small enough) */
102 static const struct sockaddr SyslogAddr = {
103 .sa_family = AF_UNIX, /* sa_family_t (usually a short) */
104 .sa_data = _PATH_LOG /* char [14] */
108 closelog_intern(int sig)
110 /* mylock must be held by the caller */
112 (void) close(LogFile);
116 if (sig == 0) { /* called from closelog()? - reset to defaults */
119 LogFacility = LOG_USER >> 3;
125 openlog_intern(const char *ident, int logstat, int logfac)
128 int logType = SOCK_DGRAM;
133 /* (we were checking also for logfac != 0, but it breaks
134 * openlog(xx, LOG_KERN) since LOG_KERN == 0) */
135 if ((logfac & ~LOG_FACMASK) == 0) /* if we don't have invalid bits */
136 LogFacility = (unsigned)logfac >> 3;
141 if (logstat & LOG_NDELAY) {
142 LogFile = fd = socket(AF_UNIX, logType, 0);
146 fcntl(fd, F_SETFD, FD_CLOEXEC);
147 /* We don't want to block if e.g. syslogd is SIGSTOPed */
148 fcntl(fd, F_SETFL, O_NONBLOCK | fcntl(fd, F_GETFL));
152 if (fd != -1 && !connected) {
153 if (connect(fd, &SyslogAddr, sizeof(SyslogAddr)) != -1) {
160 if (logType == SOCK_DGRAM) {
161 logType = SOCK_STREAM;
169 * OPENLOG -- open system log
172 openlog(const char *ident, int logstat, int logfac)
174 __UCLIBC_MUTEX_LOCK(mylock);
175 openlog_intern(ident, logstat, logfac);
176 __UCLIBC_MUTEX_UNLOCK(mylock);
181 * print message on log file; output is intended for syslogd(8).
188 __vsyslog(int pri, const char *fmt, va_list ap)
191 char *last_chr, *head_end, *end, *stdp;
195 char tbuf[1024]; /* syslogd is unable to handle longer messages */
197 /* Just throw out this message if pri has bad bits. */
198 if ((pri & ~(LOG_PRIMASK|LOG_FACMASK)) != 0)
203 __UCLIBC_MUTEX_LOCK(mylock);
205 /* See if we should just throw out this message according to LogMask. */
206 if ((LogMask & LOG_MASK(LOG_PRI(pri))) == 0)
208 if (LogFile < 0 || !connected)
209 openlog_intern(NULL, LogStat | LOG_NDELAY, (int)LogFacility << 3);
211 /* Set default facility if none specified. */
212 if ((pri & LOG_FACMASK) == 0)
213 pri |= ((int)LogFacility << 3);
215 /* Build the message. We know the starting part of the message can take
216 * no longer than 64 characters plus length of the LogTag. So it's
217 * safe to test only LogTag and use normal sprintf everywhere else.
220 stdp = p = tbuf + sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4);
221 /*if (LogTag) - always true */ {
222 if (strlen(LogTag) < sizeof(tbuf) - 64)
223 p += sprintf(p, "%s", LogTag);
225 p += sprintf(p, "<BUFFER OVERRUN ATTEMPT>");
227 if (LogStat & LOG_PID)
228 p += sprintf(p, "[%d]", getpid());
229 /*if (LogTag) - always true */ {
235 /* We format the rest of the message. If the buffer becomes full, we mark
236 * the message as truncated. Note that we require at least 2 free bytes
237 * in the buffer as we might want to add "\r\n" there.
240 end = tbuf + sizeof(tbuf) - 1;
241 __set_errno(saved_errno);
242 p += vsnprintf(p, end - p, fmt, ap);
243 if (p >= end || p < head_end) { /* Returned -1 in case of error... */
244 static const char truncate_msg[12] = "[truncated] "; /* no NUL! */
245 memmove(head_end + sizeof(truncate_msg), head_end,
246 end - head_end - sizeof(truncate_msg));
247 memcpy(head_end, truncate_msg, sizeof(truncate_msg));
249 while (p < end && *p) {
260 /* Output to stderr if requested. */
261 if (LogStat & LOG_PERROR) {
263 (void)write(STDERR_FILENO, stdp, last_chr - stdp + 1);
266 /* Output the message to the local logger using NUL as a message delimiter. */
271 /* can't just use write, it can result in SIGPIPE */
272 rc = send(LogFile, p, last_chr + 1 - p, MSG_NOSIGNAL);
274 /* I don't think looping forever on EAGAIN is a good idea.
275 * Imagine that syslogd is SIGSTOPed... */
276 if (/* (errno != EAGAIN) && */ (errno != EINTR)) {
277 closelog_intern(1); /* 1: do not reset LogXXX globals to default */
283 } while (p <= last_chr);
289 * Output the message to the console; don't worry about blocking,
290 * if console blocks everything will. Make sure the error reported
291 * is the one from the syslogd failure.
293 /* should mode be O_WRONLY | O_NOCTTY? -- Uli */
294 /* yes, but in Linux "/dev/console" never becomes ctty anyway -- vda */
295 if ((LogStat & LOG_CONS) &&
296 (fd = open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY)) >= 0) {
297 p = strchr(tbuf, '>') + 1;
300 (void)write(fd, p, last_chr - p + 2);
305 __UCLIBC_MUTEX_UNLOCK(mylock);
308 strong_alias(__vsyslog,vsyslog)
312 syslog(int pri, const char *fmt, ...)
317 __vsyslog(pri, fmt, ap);
320 libc_hidden_def(syslog)
323 * CLOSELOG -- close the system log
328 __UCLIBC_MUTEX_LOCK(mylock);
329 closelog_intern(0); /* 0: reset LogXXX globals to default */
330 __UCLIBC_MUTEX_UNLOCK(mylock);
333 /* setlogmask -- set the log mask level */
334 int setlogmask(int pmask)
340 /* __UCLIBC_MUTEX_LOCK(mylock);*/
342 /* __UCLIBC_MUTEX_UNLOCK(mylock);*/