daemon.h

/*
 * daemon.h
 *
 *
 * version 1.1
 *
 *
 *
 * BSD 3-Clause License
 *
 * Copyright (c) 2015, Koynov Stas - skojnov@yandex.ru
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef DAEMON_HEADER
#define DAEMON_HEADER


#include <stddef.h>  //for NULL





#define DAEMON_DEF_TO_STR_(text) #text
#define DAEMON_DEF_TO_STR(arg) DAEMON_DEF_TO_STR_(arg)


#define DAEMON_MAJOR_VERSION_STR  DAEMON_DEF_TO_STR(DAEMON_MAJOR_VERSION)
#define DAEMON_MINOR_VERSION_STR  DAEMON_DEF_TO_STR(DAEMON_MINOR_VERSION)
#define DAEMON_PATCH_VERSION_STR  DAEMON_DEF_TO_STR(DAEMON_PATCH_VERSION)

#define DAEMON_VERSION_STR  DAEMON_MAJOR_VERSION_STR "." \
                            DAEMON_MINOR_VERSION_STR "." \
                            DAEMON_PATCH_VERSION_STR





struct daemon_info_t
{
    //flags
    unsigned int terminated     :1;
    unsigned int daemonized     :1;
    unsigned int no_chdir       :1;
    unsigned int no_fork        :1;
    unsigned int no_close_stdio :1;

    const char *pid_file;
    const char *log_file;
    const char *cmd_pipe;
};


extern volatile struct daemon_info_t daemon_info;





int redirect_stdio_to_devnull(void);
int create_pid_file(const char *pid_file_name);



void daemon_error_exit(const char *format, ...);
void exit_if_not_daemonized(int exit_status);



void daemonize2(void (*optional_init)(void *), void *data);

static inline void daemonize() { daemonize2(NULL, NULL); }





#endif //DAEMON_HEADER