74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
/*
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* Copyright (c) 2014 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 a condition to the system log.
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*/
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#include <stdarg.h>
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#include <stdint.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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char* __syslog_identity = NULL;
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int __syslog_facility = LOG_USER;
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int __syslog_fd = -1;
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int __syslog_mask = LOG_UPTO(LOG_DEBUG);
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int __syslog_option = 0;
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// TODO: The transmitted string might be delivered in chunks using this dprintf
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// approach (plus there are multiple dprintf calls). We should buffer the
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// string fully before transmitting it.
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// TODO: The log entry format here is just whatever some other system does. We
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// should work out the Sortix system log semantics and adapt this to that.
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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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// Connect to the system log if a connection hasn't yet been established.
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if ( __syslog_fd < 0 && (__syslog_fd = connectlog()) < 0 )
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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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// Prepare a timestamp for the log event.
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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 timestamp[32];
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strftime(timestamp, sizeof(timestamp), "%b %e %T", &tm);
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// Include the process id of the current process if requested.
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pid_t pid = (__syslog_option & LOG_PID) ? getpid() : 0;
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// Transmit the event to the system log.
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dprintf(__syslog_fd, "<%d>%s %s%s%.0jd%s: ",
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priority,
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timestamp,
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__syslog_identity ? __syslog_identity : "",
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"[" + !pid, (intmax_t) pid, "]" + !pid);
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vdprintf(__syslog_fd, format, ap);
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dprintf(__syslog_fd, "\n");
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}
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