libsystem_asl.tproj/src/syslog.c

   1 /*
   2  * Copyright (c) 1999-2010 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 <sys/syslog.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <stdint.h>
  61 #include <pthread.h>
  62 #include <dispatch/dispatch.h>
  63 #include <asl.h>
  64 #include "asl_private.h"
  65
  66 #ifdef __STDC__
  67 #include <stdarg.h>
  68 #else
  69 #include <varargs.h>
  70 #endif
  71
  72 #define LOG_NO_NOTIFY   0x1000
  73 extern const char *asl_syslog_faciliy_num_to_name(int n);
  74
  75 #ifdef BUILDING_VARIANT
  76 __private_extern__ pthread_mutex_t _sl_lock;
  77 __private_extern__ aslclient _sl_asl;
  78 __private_extern__ char *_sl_ident;
  79 __private_extern__ int _sl_fac;
  80 __private_extern__ int _sl_opts;
  81 __private_extern__ int _sl_mask;
  82 #else /* !BUILDING_VARIANT */
  83 __private_extern__ pthread_mutex_t _sl_lock = PTHREAD_MUTEX_INITIALIZER;
  84 __private_extern__ aslclient _sl_asl = NULL;
  85 __private_extern__ char *_sl_ident = NULL;
  86 __private_extern__ int _sl_fac = 0;
  87 __private_extern__ int _sl_opts = 0;
  88 __private_extern__ int _sl_mask = 0;
  89 #endif /* BUILDING_VARIANT */
  90
  91 /*
  92  * syslog, vsyslog --
  93  *      print message on log file; output is intended for syslogd(8).
  94  */
  95 void
  96 #ifdef __STDC__
  97 syslog(int pri, const char *fmt, ...)
  98 #else
  99 syslog(pri, fmt, va_alist)
 100         int pri;
 101         char *fmt;
 102         va_dcl
 103 #endif
 104 {
 105         va_list ap;
 106
 107 #ifdef __STDC__
 108         va_start(ap, fmt);
 109 #else
 110         va_start(ap);
 111 #endif
 112         vsyslog(pri, fmt, ap);
 113         va_end(ap);
 114 }
 115
 116 void
 117 vsyslog(int pri, const char *fmt, va_list ap)
 118 {
 119         int fac;
 120         aslmsg facmsg;
 121         const char *facility;
 122
 123         facmsg = NULL;
 124         fac = pri & LOG_FACMASK;
 125         if (fac != 0)
 126         {
 127                 facility = asl_syslog_faciliy_num_to_name(fac);
 128                 if (facility != NULL)
 129                 {
 130                         facmsg = asl_new(ASL_TYPE_MSG);
 131                         asl_set(facmsg, ASL_KEY_FACILITY, facility);
 132                 }
 133         }
 134
 135         pthread_mutex_lock(&_sl_lock);
 136
 137         /* open syslog ASL client if required */
 138         if (_sl_asl == NULL)
 139         {
 140                 _sl_asl = asl_open(NULL, NULL, ASL_OPT_SYSLOG_LEGACY);
 141                 _sl_mask = ASL_FILTER_MASK_UPTO(ASL_LEVEL_DEBUG);
 142                 asl_set_filter(_sl_asl, _sl_mask);
 143         }
 144
 145         asl_vlog(_sl_asl, facmsg, LOG_PRI(pri), fmt, ap);
 146
 147         pthread_mutex_unlock(&_sl_lock);
 148
 149         if (facmsg != NULL) asl_free(facmsg);
 150 }
 151
 152 #ifndef BUILDING_VARIANT
 153
 154 void
 155 openlog(const char *ident, int opts, int logfac)
 156 {
 157         const char *facility;
 158         uint32_t asl_opts;
 159
 160         pthread_mutex_lock(&_sl_lock);
 161
 162         /* close existing aslclient */
 163         asl_close(_sl_asl);
 164         _sl_asl = NULL;
 165
 166         free(_sl_ident);
 167         _sl_ident = NULL;
 168
 169         /* open with specified parameters */
 170
 171         if (ident != NULL) _sl_ident = strdup(ident);
 172         /* NB we allow the strdup to fail silently */
 173
 174         _sl_fac = logfac;
 175         facility = asl_syslog_faciliy_num_to_name(_sl_fac);
 176
 177         _sl_opts = opts;
 178         asl_opts = ASL_OPT_SYSLOG_LEGACY;
 179
 180         if (_sl_opts & LOG_NO_NOTIFY) asl_opts |= ASL_OPT_NO_REMOTE;
 181         if (_sl_opts & LOG_PERROR) asl_opts |= ASL_OPT_STDERR;
 182
 183         _sl_mask = ASL_FILTER_MASK_UPTO(ASL_LEVEL_DEBUG);
 184
 185         _sl_asl = asl_open(_sl_ident, facility, asl_opts);
 186         asl_set_filter(_sl_asl, _sl_mask);
 187
 188         pthread_mutex_unlock(&_sl_lock);
 189 }
 190
 191 void
 192 closelog()
 193 {
 194         pthread_mutex_lock(&_sl_lock);
 195
 196         if (_sl_asl != NULL) asl_close(_sl_asl);
 197         _sl_asl = NULL;
 198
 199         if (_sl_ident != NULL) free(_sl_ident);
 200         _sl_ident = NULL;
 201
 202         pthread_mutex_unlock(&_sl_lock);
 203 }
 204
 205 /* setlogmask -- set the log mask level */
 206 int
 207 setlogmask(int mask)
 208 {
 209         int oldmask;
 210
 211         if (mask == 0) return _sl_mask;
 212
 213         pthread_mutex_lock(&_sl_lock);
 214
 215         _sl_mask = mask;
 216         oldmask = asl_set_filter(_sl_asl, mask);
 217
 218         pthread_mutex_unlock(&_sl_lock);
 219
 220         return oldmask;
 221 }
 222
 223 #endif /* !BUILDING_VARIANT */