libsystem_asl.tproj/src/syslog.c

   1 /*
   2  * Copyright (c) 1999-2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * Copyright (c) 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #include <stdio.h>
  58
  59 #include <sys/syslog.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <stdint.h>
  63 #include <pthread.h>
  64 #include <dispatch/dispatch.h>
  65 #include <asl.h>
  66 #include <asl_msg.h>
  67 #include <asl_private.h>
  68
  69 #ifdef __STDC__
  70 #include <stdarg.h>
  71 #else
  72 #include <varargs.h>
  73 #endif
  74
  75 #define LOG_NO_NOTIFY   0x1000
  76 extern const char *asl_syslog_faciliy_num_to_name(int n);
  77
  78 #ifdef BUILDING_VARIANT
  79 __private_extern__ pthread_mutex_t _sl_lock;
  80 __private_extern__ aslclient _sl_asl;
  81 __private_extern__ char *_sl_ident;
  82 __private_extern__ int _sl_fac;
  83 __private_extern__ int _sl_opts;
  84 __private_extern__ int _sl_mask;
  85 #else /* !BUILDING_VARIANT */
  86 __private_extern__ pthread_mutex_t _sl_lock = PTHREAD_MUTEX_INITIALIZER;
  87 __private_extern__ aslclient _sl_asl = NULL;
  88 __private_extern__ char *_sl_ident = NULL;
  89 __private_extern__ int _sl_fac = 0;
  90 __private_extern__ int _sl_opts = 0;
  91 __private_extern__ int _sl_mask = 0;
  92 #endif /* BUILDING_VARIANT */
  93
  94 /*
  95  * syslog, vsyslog --
  96  *      print message on log file; output is intended for syslogd(8).
  97  */
  98 void
  99 #ifdef __STDC__
 100 syslog(int pri, const char *fmt, ...)
 101 #else
 102 syslog(pri, fmt, va_alist)
 103         int pri;
 104         char *fmt;
 105         va_dcl
 106 #endif
 107 {
 108         va_list ap;
 109
 110 #ifdef __STDC__
 111         va_start(ap, fmt);
 112 #else
 113         va_start(ap);
 114 #endif
 115         vsyslog(pri, fmt, ap);
 116         va_end(ap);
 117 }
 118
 119 void
 120 vsyslog(int pri, const char *fmt, va_list ap)
 121 {
 122         int fac;
 123         asl_msg_t *facmsg;
 124         const char *facility;
 125
 126         facmsg = NULL;
 127         fac = pri & LOG_FACMASK;
 128         if (fac != 0)
 129         {
 130                 facility = asl_syslog_faciliy_num_to_name(fac);
 131                 if (facility != NULL)
 132                 {
 133                         facmsg = asl_msg_new(ASL_TYPE_MSG);
 134                         asl_msg_set_key_val(facmsg, ASL_KEY_FACILITY, facility);
 135                 }
 136         }
 137
 138         pthread_mutex_lock(&_sl_lock);
 139
 140         /* open syslog ASL client if required */
 141         if (_sl_asl == NULL)
 142         {
 143                 _sl_asl = asl_open(NULL, NULL, ASL_OPT_SYSLOG_LEGACY);
 144                 _sl_mask = ASL_FILTER_MASK_UPTO(ASL_LEVEL_DEBUG);
 145                 asl_set_filter(_sl_asl, _sl_mask);
 146         }
 147
 148         asl_vlog(_sl_asl, (aslmsg)facmsg, LOG_PRI(pri), fmt, ap);
 149
 150         pthread_mutex_unlock(&_sl_lock);
 151
 152         if (facmsg != NULL) asl_msg_release(facmsg);
 153 }
 154
 155 #ifndef BUILDING_VARIANT
 156
 157 void
 158 openlog(const char *ident, int opts, int logfac)
 159 {
 160         const char *facility;
 161         uint32_t asl_opts;
 162
 163         pthread_mutex_lock(&_sl_lock);
 164
 165         if (_sl_asl != NULL) asl_close(_sl_asl);
 166         _sl_asl = NULL;
 167
 168         free(_sl_ident);
 169         _sl_ident = NULL;
 170
 171         /* open with specified parameters */
 172
 173         if (ident != NULL) _sl_ident = strdup(ident);
 174         /* NB we allow the strdup to fail silently */
 175
 176         _sl_fac = logfac;
 177         facility = asl_syslog_faciliy_num_to_name(_sl_fac);
 178
 179         _sl_opts = opts;
 180         asl_opts = ASL_OPT_SYSLOG_LEGACY;
 181
 182         if (_sl_opts & LOG_NO_NOTIFY) asl_opts |= ASL_OPT_NO_REMOTE;
 183         if (_sl_opts & LOG_PERROR) asl_opts |= ASL_OPT_STDERR;
 184
 185         _sl_mask = ASL_FILTER_MASK_UPTO(ASL_LEVEL_DEBUG);
 186
 187         _sl_asl = asl_open(_sl_ident, facility, asl_opts);
 188         asl_set_filter(_sl_asl, _sl_mask);
 189
 190         pthread_mutex_unlock(&_sl_lock);
 191 }
 192
 193 void
 194 closelog()
 195 {
 196         pthread_mutex_lock(&_sl_lock);
 197
 198         if (_sl_asl != NULL) asl_close(_sl_asl);
 199         _sl_asl = NULL;
 200
 201         free(_sl_ident);
 202         _sl_ident = NULL;
 203
 204         pthread_mutex_unlock(&_sl_lock);
 205 }
 206
 207 /* setlogmask -- set the log mask level */
 208 int
 209 setlogmask(int mask)
 210 {
 211         int oldmask;
 212
 213         if (mask == 0) return _sl_mask;
 214
 215         pthread_mutex_lock(&_sl_lock);
 216
 217         _sl_mask = mask;
 218         oldmask = asl_set_filter(_sl_asl, mask);
 219         if (_sl_opts & LOG_PERROR) asl_set_output_file_filter(_sl_asl, STDERR_FILENO, mask);
 220
 221         pthread_mutex_unlock(&_sl_lock);
 222
 223         return oldmask;
 224 }
 225
 226 #endif /* !BUILDING_VARIANT */