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      1 /***
      2   This file is part of libdaemon.
      3 
      4   Copyright 2003-2008 Lennart Poettering
      5 
      6   Permission is hereby granted, free of charge, to any person obtaining a copy
      7   of this software and associated documentation files (the "Software"), to deal
      8   in the Software without restriction, including without limitation the rights
      9   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10   copies of the Software, and to permit persons to whom the Software is
     11   furnished to do so, subject to the following conditions:
     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   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     22   SOFTWARE.
     23 
     24 ***/
     25 
     26 #ifdef HAVE_CONFIG_H
     27 #include <config.h>
     28 #endif
     29 
     30 #include <stdarg.h>
     31 #include <stdio.h>
     32 #include <string.h>
     33 #include <errno.h>
     34 
     35 #include "dlog.h"
     36 
     37 enum daemon_log_flags daemon_log_use = DAEMON_LOG_AUTO|DAEMON_LOG_STDERR;
     38 const char* daemon_log_ident = NULL;
     39 
     40 static int daemon_verbosity_level = LOG_INFO;
     41 
     42 void daemon_set_verbosity(int verbosity_prio) {
     43 
     44     /* Allow using negative verbosity levels to hide _all_ messages */
     45     if (verbosity_prio > 0 && (verbosity_prio & LOG_PRIMASK) != LOG_PRIMASK)
     46         daemon_log(LOG_ERR, "The value %d is not a valid priority value", verbosity_prio);
     47 
     48     daemon_verbosity_level = verbosity_prio & LOG_PRIMASK;
     49 }
     50 
     51 void daemon_logv(int prio, const char* template, va_list arglist) {
     52     int saved_errno;
     53 
     54     saved_errno = errno;
     55 
     56     if (daemon_log_use & DAEMON_LOG_SYSLOG) {
     57         openlog(daemon_log_ident ? daemon_log_ident : "UNKNOWN", LOG_PID, LOG_DAEMON);
     58         vsyslog(prio | LOG_DAEMON, template, arglist);
     59     }
     60 
     61     if (prio > daemon_verbosity_level)
     62         goto end_daemon_logv;
     63 
     64     if (daemon_log_use & DAEMON_LOG_STDERR) {
     65         vfprintf(stderr, template, arglist);
     66         fprintf(stderr, "\n");
     67     }
     68 
     69     if (daemon_log_use & DAEMON_LOG_STDOUT) {
     70         vfprintf(stdout, template, arglist);
     71         fprintf(stdout, "\n");
     72     }
     73 
     74  end_daemon_logv:
     75     errno = saved_errno;
     76 }
     77 
     78 void daemon_log(int prio, const char* template, ...) {
     79     va_list arglist;
     80 
     81     va_start(arglist, template);
     82     daemon_logv(prio, template, arglist);
     83     va_end(arglist);
     84 }
     85 
     86 char *daemon_ident_from_argv0(char *argv0) {
     87     char *p;
     88 
     89     if ((p = strrchr(argv0, '/')))
     90         return p+1;
     91 
     92     return argv0;
     93 }
     94