1/***
2  This file is part of libdaemon.
3
4  Copyright 2003-2008 Lennart Poettering
5
6  libdaemon is free software; you can redistribute it and/or modify
7  it under the terms of the GNU Lesser General Public License as
8  published by the Free Software Foundation, either version 2.1 of the
9  License, or (at your option) any later version.
10
11  libdaemon is distributed in the hope that it will be useful, but
12  WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  Lesser General Public License for more details.
15
16  You should have received a copy of the GNU Lesser General Public
17  License along with libdaemon. If not, see
18  <http://www.gnu.org/licenses/>.
19***/
20
21#ifdef HAVE_CONFIG_H
22#include <config.h>
23#endif
24
25#include <stdarg.h>
26#include <stdio.h>
27#include <string.h>
28#include <errno.h>
29
30#include "dlog.h"
31
32enum daemon_log_flags daemon_log_use = DAEMON_LOG_AUTO|DAEMON_LOG_STDERR;
33const char* daemon_log_ident = NULL;
34
35static int daemon_verbosity_level = LOG_INFO;
36
37void daemon_set_verbosity(int verbosity_prio) {
38
39    /* Allow using negative verbosity levels to hide _all_ messages */
40    if (verbosity_prio > 0 && (verbosity_prio & LOG_PRIMASK) != LOG_PRIMASK)
41        daemon_log(LOG_ERR, "The value %d is not a valid priority value", verbosity_prio);
42
43    daemon_verbosity_level = verbosity_prio & LOG_PRIMASK;
44}
45
46void daemon_logv(int prio, const char* template, va_list arglist) {
47    int saved_errno;
48
49    saved_errno = errno;
50
51    if (daemon_log_use & DAEMON_LOG_SYSLOG) {
52        openlog(daemon_log_ident ? daemon_log_ident : "UNKNOWN", LOG_PID, LOG_DAEMON);
53        vsyslog(prio | LOG_DAEMON, template, arglist);
54    }
55
56    if (prio > daemon_verbosity_level)
57        goto end_daemon_logv;
58
59    if (daemon_log_use & DAEMON_LOG_STDERR) {
60        vfprintf(stderr, template, arglist);
61        fprintf(stderr, "\n");
62    }
63
64    if (daemon_log_use & DAEMON_LOG_STDOUT) {
65        vfprintf(stdout, template, arglist);
66        fprintf(stdout, "\n");
67    }
68
69 end_daemon_logv:
70    errno = saved_errno;
71}
72
73void daemon_log(int prio, const char* template, ...) {
74    va_list arglist;
75
76    va_start(arglist, template);
77    daemon_logv(prio, template, arglist);
78    va_end(arglist);
79}
80
81char *daemon_ident_from_argv0(char *argv0) {
82    char *p;
83
84    if ((p = strrchr(argv0, '/')))
85        return p+1;
86
87    return argv0;
88}
89