libdaemon-0.14/libdaemon/dlog.c

/***
  This file is part of libdaemon.

  Copyright 2003-2008 Lennart Poettering

  libdaemon is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation, either version 2.1 of the
  License, or (at your option) any later version.

  libdaemon is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with libdaemon. If not, see
  <http://www.gnu.org/licenses/>.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include "dlog.h"

enum daemon_log_flags daemon_log_use = DAEMON_LOG_AUTO|DAEMON_LOG_STDERR;
const char* daemon_log_ident = NULL;

static int daemon_verbosity_level = LOG_INFO;

void daemon_set_verbosity(int verbosity_prio) {

    /* Allow using negative verbosity levels to hide _all_ messages */
    if (verbosity_prio > 0 && (verbosity_prio & LOG_PRIMASK) != LOG_PRIMASK)
        daemon_log(LOG_ERR, "The value %d is not a valid priority value", verbosity_prio);

    daemon_verbosity_level = verbosity_prio & LOG_PRIMASK;
}

void daemon_logv(int prio, const char* template, va_list arglist) {
    int saved_errno;

    saved_errno = errno;

    if (daemon_log_use & DAEMON_LOG_SYSLOG) {
        openlog(daemon_log_ident ? daemon_log_ident : "UNKNOWN", LOG_PID, LOG_DAEMON);
        vsyslog(prio | LOG_DAEMON, template, arglist);
    }

    if (prio > daemon_verbosity_level)
        goto end_daemon_logv;

    if (daemon_log_use & DAEMON_LOG_STDERR) {
        vfprintf(stderr, template, arglist);
        fprintf(stderr, "\n");
    }

    if (daemon_log_use & DAEMON_LOG_STDOUT) {
        vfprintf(stdout, template, arglist);
        fprintf(stdout, "\n");
    }

 end_daemon_logv:
    errno = saved_errno;
}

void daemon_log(int prio, const char* template, ...) {
    va_list arglist;

    va_start(arglist, template);
    daemon_logv(prio, template, arglist);
    va_end(arglist);
}

char *daemon_ident_from_argv0(char *argv0) {
    char *p;

    if ((p = strrchr(argv0, '/')))
        return p+1;

    return argv0;
}