84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/*
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* Copyright (c) 2014, 2022 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* syslog/vsyslog.c
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* Logs an event to the system log.
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*/
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#include <sys/types.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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// TODO: The Sortix <limits.h> doesn't expose this at the moment.
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#if !defined(HOST_NAME_MAX) && defined(__sortix__)
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#include <sortix/limits.h>
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#endif
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char* __syslog_identity = NULL;
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int __syslog_facility = LOG_USER;
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int __syslog_mask = LOG_UPTO(LOG_DEBUG);
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int __syslog_option = 0;
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void vsyslog(int priority, const char* format, va_list ap)
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{
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// Drop the event if it doesn't fit the current priority mask.
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if ( !(LOG_MASK(LOG_PRI(priority)) & __syslog_mask) )
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return;
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// If no facility is given we'll use the default facility from openlog.
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if ( !LOG_FAC(priority) )
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priority |= __syslog_facility;
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// Gather the log event metadata.
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int version = 1; // RFC 5424
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struct timespec now;
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clock_gettime(CLOCK_REALTIME, &now);
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struct tm tm;
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gmtime_r(&now.tv_sec, &tm);
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char timeformat[64];
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snprintf(timeformat, sizeof(timeformat),
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"%%FT%%T.%06liZ", now.tv_nsec / 1000);
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char timestamp[64];
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strftime(timestamp, sizeof(timestamp), timeformat, &tm);
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char hostname[HOST_NAME_MAX + 1] = "-";
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gethostname(hostname, sizeof(hostname));
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const char* identity = __syslog_identity ? __syslog_identity : "-";
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char pidstr[3 * sizeof(pid_t)] = "-";
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if ( __syslog_option & LOG_PID )
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snprintf(pidstr, sizeof(pidstr), "%"PRIdPID, getpid());
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const char* msgid = "-";
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const char* structured_data = "-";
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// Transmit the event to the system log.
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flockfile(stderr);
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fprintf(stderr, "<%d>%d %s %s %s %s %s %s ",
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priority,
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version,
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timestamp,
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hostname,
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identity,
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pidstr,
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msgid,
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structured_data);
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vfprintf(stderr, format, ap);
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fputc('\n', stderr);
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funlockfile(stderr);
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}
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