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      1 /*
      2  * error message handling
      3  */
      4 /*
      5 Copyright 1994, 1998  The Open Group
      6 
      7 Permission to use, copy, modify, distribute, and sell this software and its
      8 documentation for any purpose is hereby granted without fee, provided that
      9 the above copyright notice appear in all copies and that both that
     10 copyright notice and this permission notice appear in supporting
     11 documentation.
     12 
     13 The above copyright notice and this permission notice shall be included in
     14 all copies or substantial portions of the Software.
     15 
     16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
     19 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
     20 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     22 
     23 Except as contained in this notice, the name of The Open Group shall not be
     24 used in advertising or otherwise to promote the sale, use or other dealings
     25 in this Software without prior written authorization from The Open Group.
     26  * Copyright 1991 Network Computing Devices;
     27  * Portions Copyright 1987 by Digital Equipment Corporation
     28  *
     29  * Permission to use, copy, modify, distribute, and sell this software and
     30  * its documentation for any purpose is hereby granted without fee, provided
     31  * that the above copyright notice appear in all copies and that both that
     32  * copyright notice and this permission notice appear in supporting
     33  * documentation, and that the names of Network Computing Devices, or Digital
     34  * not be used in advertising or publicity pertaining to distribution
     35  * of the software without specific, written prior permission.
     36  *
     37  * NETWORK COMPUTING DEVICES, DIGITAL DISCLAIM ALL WARRANTIES WITH
     38  * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
     39  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL NETWORK COMPUTING DEVICES,
     40  * OR DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
     41  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
     42  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
     43  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
     44  * THIS SOFTWARE.
     45  */
     46 
     47 #include	"config.h"
     48 
     49 #include	<stdio.h>
     50 #include	<stdlib.h>
     51 #include	<stdarg.h>
     52 #include	<X11/Xos.h>
     53 
     54 #ifdef USE_SYSLOG
     55 #include	<syslog.h>
     56 #endif
     57 
     58 #include	<errno.h>
     59 
     60 #include	"misc.h"
     61 #include	"globals.h"
     62 #include	"osdep.h"
     63 
     64 Bool        UseSyslog;
     65 Bool        log_open = FALSE;
     66 char        ErrorFile[PATH_MAX];
     67 static char	CurrentErrorFile[PATH_MAX];
     68 
     69 static void _X_NORETURN
     70 abort_server(void)
     71 {
     72     fflush(stderr);
     73 
     74     _exit(1);
     75 }
     76 
     77 void
     78 InitErrors(void)
     79 {
     80     int         i;
     81 
     82 #ifdef USE_SYSLOG
     83     if (UseSyslog && !log_open) {
     84 	openlog("xfs", LOG_PID, LOG_DAEMON);
     85 	log_open = TRUE;
     86 	return;
     87     }
     88 #endif
     89 
     90     if (ErrorFile[0] &&
     91 	(!log_open || (strcmp(CurrentErrorFile, ErrorFile) != 0)) ) {
     92 	i = open(ErrorFile, O_WRONLY | O_APPEND | O_CREAT, 0666);
     93 	if (i != -1) {
     94 	    dup2(i, 2);
     95 	    close(i);
     96 	    log_open = TRUE;
     97 	} else {
     98 	    ErrorF("can't open error file \"%s\"\n", ErrorFile);
     99 	}
    100 	strncpy(CurrentErrorFile, ErrorFile, sizeof CurrentErrorFile);
    101     }
    102 }
    103 
    104 void
    105 CloseErrors(void)
    106 {
    107     int nullfd;
    108 
    109     if (!log_open)
    110 	return;
    111 
    112     log_open = FALSE;
    113 
    114 #ifdef USE_SYSLOG
    115     if (UseSyslog) {
    116 	closelog();
    117 	return;
    118     }
    119 #endif
    120 
    121     close (2);
    122     nullfd = open ("/dev/null", O_RDWR);
    123     if (nullfd != 2) {
    124 	dup2 (nullfd, 2);
    125 	close(nullfd);
    126     }
    127 }
    128 
    129 void
    130 Error(const char *str)
    131 {
    132 #ifdef USE_SYSLOG
    133     if (UseSyslog) {
    134 	syslog(LOG_ERR, "%s: %s", str, strerror(errno));
    135 	return;
    136     }
    137 #endif
    138     perror(str);
    139 }
    140 
    141 /*
    142  * used for informational messages
    143  */
    144 void
    145 NoticeF(const char *f, ...)
    146 {
    147     /* XXX should Notices just be ignored if not using syslog? */
    148     va_list args;
    149     va_start(args, f);
    150 #ifdef USE_SYSLOG
    151     if (UseSyslog) {
    152 	vsyslog(LOG_NOTICE, f, args);
    153 	return;
    154     }
    155 #else
    156     fprintf(stderr, "%s notice: ", progname);
    157     vfprintf(stderr, f, args);
    158 #endif /* USE_SYSLOG */
    159     va_end(args);
    160 }
    161 
    162 /*
    163  * used for non-fatal error messages
    164  */
    165 void
    166 ErrorF(const char * f, ...)
    167 {
    168     va_list args;
    169     va_start(args, f);
    170 #ifdef USE_SYSLOG
    171     if (UseSyslog) {
    172 	vsyslog(LOG_WARNING, f, args);
    173     }
    174     else
    175 #endif
    176     {
    177 	fprintf(stderr, "%s error: ", progname);
    178 	vfprintf(stderr, f, args);
    179     }
    180     va_end(args);
    181 }
    182 
    183 void
    184 FatalError(const char * f, ...)
    185 {
    186     va_list args;
    187     va_start(args, f);
    188 #ifdef USE_SYSLOG
    189     if (UseSyslog) {
    190 	vsyslog(LOG_ERR, f, args);
    191     }
    192     else
    193 #endif
    194     {
    195 	fprintf(stderr, "%s fatal error: ", progname);
    196 	vfprintf(stderr, f, args);
    197     }
    198     va_end(args);
    199     abort_server();
    200     /* NOTREACHED */
    201 }
    202