libdaemon/dexec.h

#ifndef foodexechfoo
#define foodexechfoo

/***
  This file is part of libdaemon.

  Copyright 2003-2008 Lennart Poettering

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.

***/

#include <stdarg.h>

#ifdef __cplusplus
extern "C" {
#endif

/** \file
 *
 * Contains a robust API for running sub processes with STDOUT and
 * STDERR redirected to syslog
 */

/** This variable is defined to 1 iff daemon_exec() is supported.
 * @since 0.4
 * @see daemon_exec() */
#define DAEMON_EXEC_AVAILABLE 1

#if defined(__GNUC__) && ! defined(DAEMON_GCC_SENTINEL)
#define DAEMON_GCC_SENTINEL __attribute__ ((sentinel))
#else
/** A macro for making use of GCCs printf compilation warnings */
#define DAEMON_GCC_SENTINEL
#endif

/** Run the specified executable with the specified arguments in the
 * specified directory and return the return value of the program in
 * the specified pointer. The calling process is blocked until the
 * child finishes and all child output (either STDOUT or STDIN) has
 * been written to syslog. Running this function requires that
 * daemon_signal() has been called with SIGCHLD as argument.
 *
 * @param dir Working directory for the process.
 * @param ret A pointer to an integer to write the return value of the program to.
 * @param prog The path to the executable
 * @param ... The arguments to be passed to the program, followed by a (char *) NULL
 * @return Nonzero on failure, zero on success
 * @since 0.4
 * @see DAEMON_EXEC_AVAILABLE
 */
int daemon_exec(const char *dir, int *ret, const char *prog, ...) DAEMON_GCC_SENTINEL;

/** This variable is defined to 1 iff daemon_execv() is supported.
 * @since 0.11
 * @see daemon_execv() */
#define DAEMON_EXECV_AVAILABLE 1

/** The same as daemon_exec, but without variadic arguments
 * @since 0.11
 * @see DAEMON_EXECV_AVAILABLE */
int daemon_execv(const char *dir, int *ret, const char *prog, va_list ap);

#ifdef __cplusplus
}
#endif

#endif