workspace/kdm/backend/error.c

   1 /*
   2
   3 Copyright 1988, 1998  The Open Group
   4 Copyright 2000-2004 Oswald Buddenhagen <ossi@kde.org>
   5
   6 Permission to use, copy, modify, distribute, and sell this software and its
   7 documentation for any purpose is hereby granted without fee, provided that
   8 the above copyright notice appear in all copies and that both that
   9 copyright notice and this permission notice appear in supporting
  10 documentation.
  11
  12 The above copyright notice and this permission notice shall be included
  13 in all copies or substantial portions of the Software.
  14
  15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18 IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21 OTHER DEALINGS IN THE SOFTWARE.
  22
  23 Except as contained in this notice, the name of a copyright holder shall
  24 not be used in advertising or otherwise to promote the sale, use or
  25 other dealings in this Software without prior written authorization
  26 from the copyright holder.
  27
  28 */
  29
  30 /*
  31  * xdm - display manager daemon
  32  * Author: Keith Packard, MIT X Consortium
  33  *
  34  * Log display manager errors to a file as
  35  * we generally do not have a terminal to talk to
  36  * or use syslog if it exists
  37  */
  38
  39 #include "dm.h"
  40 #include "dm_error.h"
  41 #include <unistd.h>
  42 #include <stdio.h>
  43
  44 #define PRINT_QUOTES
  45 #define PRINT_ARRAYS
  46 #define LOG_DEBUG_MASK DEBUG_CORE
  47 #define LOG_PANIC_EXIT 1
  48 #define NEED_ASPRINTF
  49 #define STATIC
  50 #include "printf.c"
  51
  52 void
  53 gDebug( const char *fmt, ... )
  54 {
  55         va_list args;
  56
  57         if (debugLevel & DEBUG_HLPCON) {
  58                 va_start( args, fmt );
  59                 logger( DM_DEBUG, fmt, args );
  60                 va_end( args );
  61         }
  62 }
  63
  64 void
  65 panic( const char *mesg )
  66 {
  67         int fd = open( "/dev/console", O_WRONLY );
  68         write( fd, "xdm panic: ", 11 );
  69         write( fd, mesg, strlen( mesg ) );
  70         write( fd, "\n", 1 );
  71 #ifdef USE_SYSLOG
  72         reInitErrorLog();
  73         syslog( LOG_ALERT, "%s", mesg );
  74 #endif
  75         exit( 1 );
  76 }
  77
  78 #ifdef USE_SYSLOG
  79 void
  80 reInitErrorLog()
  81 {
  82         if (!(debugLevel & DEBUG_NOSYSLOG))
  83                 InitLog();
  84 }
  85 #endif
  86
  87 void
  88 initErrorLog( const char *errorLogFile )
  89 {
  90         int fd;
  91         char buf[128];
  92
  93 #ifdef USE_SYSLOG
  94         reInitErrorLog();
  95 #endif
  96         /* We do this independently of using syslog, as we cannot redirect
  97          * the output of external programs to syslog.
  98          */
  99         if (!errorLogFile || strcmp( errorLogFile, "-" )) {
 100                 if (!errorLogFile) {
 101                         sprintf( buf, "/var/log/%s.log", prog );
 102                         errorLogFile = buf;
 103                 }
 104                 if ((fd = open( errorLogFile, O_CREAT | O_APPEND | O_WRONLY, 0666 )) < 0)
 105                         logError( "Cannot open log file %s\n", errorLogFile );
 106                 else {
 107 #ifdef USE_SYSLOG
 108 # ifdef USE_PAM
 109 #  define PAMLOG " PAM logs messages related to authentication to authpriv.*."
 110 # else
 111 #  define PAMLOG
 112 # endif
 113 # define WARNMSG \
 114   "********************************************************************************\n" \
 115   "Note that your system uses syslog. All of kdm's internally generated messages\n" \
 116   "(i.e., not from libraries and external programs/scripts it uses) go to the\n" \
 117   "daemon.* syslog facility; check your syslog configuration to find out to which\n" \
 118   "file(s) it is logged." PAMLOG "\n" \
 119   "********************************************************************************\n\n"
 120                         if (!lseek( fd, 0, SEEK_END ))
 121                                 write( fd, WARNMSG, sizeof(WARNMSG) - 1 );
 122 #endif
 123                         dup2( fd, 1 );
 124                         close( fd );
 125                         dup2( 1, 2 );
 126                 }
 127         }
 128 }
 129