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      1 /*
      2 
      3 Copyright 1988, 1998  The Open Group
      4 
      5 Permission to use, copy, modify, distribute, and sell this software and its
      6 documentation for any purpose is hereby granted without fee, provided that
      7 the above copyright notice appear in all copies and that both that
      8 copyright notice and this permission notice appear in supporting
      9 documentation.
     10 
     11 The above copyright notice and this permission notice shall be included
     12 in all copies or substantial portions of the Software.
     13 
     14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     16 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     17 IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 OTHER DEALINGS IN THE SOFTWARE.
     21 
     22 Except as contained in this notice, the name of The Open Group shall
     23 not be used in advertising or otherwise to promote the sale, use or
     24 other dealings in this Software without prior written authorization
     25 from The Open Group.
     26 
     27 */
     28 
     29 /*
     30  * xdm - display manager daemon
     31  * Author:  Keith Packard, MIT X Consortium
     32  *
     33  * error.c
     34  *
     35  * Log display manager errors to a file as
     36  * we generally do not have a terminal to talk to
     37  */
     38 
     39 #include <stdio.h>
     40 #include <stdarg.h>
     41 
     42 #include "dm.h"
     43 #include "dm_error.h"
     44 
     45 /* This function does the actual log message writes. */
     46 static inline void _X_ATTRIBUTE_PRINTF(1,0)
     47 LogVWrite(const char *fmt, va_list args)
     48 {
     49     char buf[1024];
     50     int len;
     51 
     52     len = vsnprintf (buf, sizeof(buf), fmt, args);
     53     if (len >= sizeof(buf)) {
     54 	len = sizeof(buf) - 1;
     55     }
     56     write(STDERR_FILENO, buf, len);
     57 }
     58 
     59 #define LogVarArgsWrite(fmt)	\
     60     do {			\
     61 	va_list args;		\
     62 	va_start(args, fmt);	\
     63 	LogVWrite(fmt, args);	\
     64 	va_end(args);		\
     65     } while(0)
     66 
     67 #define LogHeader(type)		\
     68     LogAppend("xdm %s (pid %ld): ", type, (long)getpid())
     69 
     70 /* Append more text to the log without a new header, right after
     71    having called LogInfo or LogError */
     72 void
     73 LogAppend(const char * fmt, ...)
     74 {
     75     LogVarArgsWrite(fmt);
     76 }
     77 
     78 void
     79 LogInfo(const char * fmt, ...)
     80 {
     81     LogHeader("info");
     82     LogVarArgsWrite(fmt);
     83 }
     84 
     85 void
     86 LogError (const char * fmt, ...)
     87 {
     88     LogHeader("error");
     89     LogVarArgsWrite(fmt);
     90 }
     91 
     92 void
     93 LogPanic (const char * fmt, ...)
     94 {
     95     LogHeader("panic");
     96     LogVarArgsWrite(fmt);
     97     _exit (1);
     98 }
     99 
    100 void
    101 LogOutOfMem (const char * fmt, ...)
    102 {
    103     fprintf (stderr, "xdm: out of memory in routine ");
    104     {
    105 	va_list args;
    106 	va_start(args, fmt);
    107 	vfprintf (stderr, fmt, args);
    108 	va_end(args);
    109     }
    110     fflush (stderr);
    111 }
    112 
    113 void
    114 Debug (const char * fmt, ...)
    115 {
    116     if (debugLevel > 0)
    117     {
    118 	LogVarArgsWrite(fmt);
    119     }
    120 }
    121 
    122 void
    123 InitErrorLog (void)
    124 {
    125     int	i;
    126     if (errorLogFile[0]) {
    127 	i = creat (errorLogFile, 0666);
    128 	if (i != -1) {
    129 	    if (i != STDERR_FILENO) {
    130 		dup2 (i, STDERR_FILENO);
    131 		close (i);
    132 	    }
    133 	} else
    134 	    LogError ("Cannot open errorLogFile %s\n", errorLogFile);
    135     }
    136 }
    137