79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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syslog/vsyslog.cpp
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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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extern "C" { char* __syslog_identity = NULL; }
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extern "C" { int __syslog_facility = LOG_USER; }
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extern "C" { int __syslog_fd = -1; }
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extern "C" { int __syslog_mask = LOG_UPTO(LOG_DEBUG); }
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extern "C" { 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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extern "C" 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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