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/usr/include/debian-installer/exec.h is in libdebian-installer4-dev 0.87.

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/*
 * exec.h
 *
 * Copyright (C) 2003 Bastian Blank <waldi@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef DEBIAN_INSTALLER__EXEC_H
#define DEBIAN_INSTALLER__EXEC_H

#include <debian-installer/types.h>

#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

/**
 * @addtogroup di_exec
 * @{
 */

di_io_handler
  /**
   * logs the output
   */
  di_exec_io_log;
di_process_handler
  /**
   * chdir to user_data
   *
   * @param user_data path
   */
  di_exec_prepare_chdir,
  /**
   * chroot to user_data
   *
   * @param user_data path
   */
  di_exec_prepare_chroot;

/**
 * execv like call
 *
 * @param path executable with path
 * @param argv NULL-terminated area of char pointer
 * @param stdout_handler di_io_handler which gets stdout (and to stderr if stderr_handler is NULL)
 * @param stderr_handler di_io_handler which gets stderr
 * @param io_user_data user_data for di_io_handler
 * @param parent_prepare_handler di_process_handler which is called after the fork in the parent
 * @param parent_prepare_user_data user_data for parent_prepare_handler
 * @param child_prepare_handler di_process_handler which is called after the fork in the child
 * @param child_prepare_user_data user_data for child_prepare_handler
 *
 * @return status or error
 */
int di_exec_full (const char *path, const char *const argv[], di_io_handler *stdout_handler, di_io_handler *stderr_handler, void *io_user_data, di_process_handler *parent_prepare_handler, void *parent_prepare_user_data, di_process_handler *child_prepare_handler, void *child_prepare_user_data);

/**
 * execv like call
 *
 * @param path executable with path
 * @param argv NULL-terminated area of char pointer
 *
 * @return status or error
 */
static inline int di_exec (const char *path, const char *const argv[])
{
  return di_exec_full (path, argv, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
}

/**
 * execve like call
 *
 * @param path executable with path
 * @param argv NULL-terminated area of char pointer
 * @param envp NULL-terminated area of char pointer
 * @param stdout_handler di_io_handler which gets stdout (and to stderr if stderr_handler is NULL)
 * @param stderr_handler di_io_handler which gets stderr
 * @param io_user_data user_data for di_io_handler
 * @param parent_prepare_handler di_process_handler which is called after the fork in the parent
 * @param parent_prepare_user_data user_data for parent_prepare_handler
 * @param child_prepare_handler di_process_handler which is called after the fork in the child
 * @param child_prepare_user_data user_data for child_prepare_handler
 *
 * @return status or error
 */
int di_exec_env_full (const char *path, const char *const argv[], const char *const envp[], di_io_handler *stdout_handler, di_io_handler *stderr_handler, void *io_user_data, di_process_handler *parent_prepare_handler, void *parent_prepare_user_data, di_process_handler *child_prepare_handler, void *child_prepare_user_data);

/**
 * execve like call
 *
 * @param path executable with path
 * @param argv NULL-terminated area of char pointer
 * @param envp NULL-terminated area of char pointer
 *
 * @return status or error
 */
static inline int di_exec_env (const char *path, const char *const argv[], const char *const envp[])
{
  return di_exec_env_full (path, argv, envp, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
}

/**
 * execvp like call
 *
 * @param file executable
 * @param argv NULL-terminated area of char pointer
 * @param stdout_handler di_io_handler which gets stdout (and to stderr if stderr_handler is NULL)
 * @param stderr_handler di_io_handler which gets stderr
 * @param io_user_data user_data for di_io_handler
 * @param parent_prepare_handler di_process_handler which is called after the fork in the parent
 * @param parent_prepare_user_data user_data for parent_prepare_handler
 * @param child_prepare_handler di_process_handler which is called after the fork in the child
 * @param child_prepare_user_data user_data for child_prepare_handler
 *
 * @return status or error
 */
int di_exec_path_full (const char *file, const char *const argv[], di_io_handler *stdout_handler, di_io_handler *stderr_handler, void *io_user_data, di_process_handler *parent_prepare_handler, void *parent_prepare_user_data, di_process_handler *child_prepare_handler, void *child_prepare_user_data);

/**
 * execvp like call
 *
 * @param file executable
 * @param argv NULL-terminated area of char pointer
 *
 * @return status or error
 */
static inline int di_exec_path (const char *file, const char *const argv[])
{
  return di_exec_path_full (file, argv, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
}

/**
 * system like call
 *
 * @param cmd command
 * @param stdout_handler di_io_handler which gets stdout
 * @param stderr_handler di_io_handler which gets stderr
 * @param io_user_data user_data for di_io_handler
 * @param parent_prepare_handler di_process_handler which is called after the fork in the parent
 * @param parent_prepare_user_data user_data for parent_prepare_handler
 * @param child_prepare_handler di_process_handler which is called after the fork in the child
 * @param child_prepare_user_data user_data for child_prepare_handler
 *
 * @return status or error
 */
int di_exec_shell_full (const char *const cmd, di_io_handler *stdout_handler, di_io_handler *stderr_handler, void *io_user_data, di_process_handler *parent_prepare_handler, void *parent_prepare_user_data, di_process_handler *child_prepare_handler, void *child_prepare_user_data);

/**
 * system like call
 *
 * @param cmd command
 *
 * @return status or error
 */
static inline int di_exec_shell (const char *const cmd)
{
  return di_exec_shell_full (cmd, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
}

/**
 * system like call with output via log
 *
 * @param cmd command
 *
 * @return status or error
 */
inline static int di_exec_shell_log (const char *const cmd)
{
  return di_exec_shell_full (cmd, di_exec_io_log, NULL, NULL, NULL, NULL, NULL, NULL);
}

/**
 * mangle status like sh does it:
 * * if signaled: 128 + signal
 * * else return code
 */
int di_exec_mangle_status (int status);

/**
 * @deprecated
 * Alias of di_exec_shell_log
 */
inline static int di_execlog (const char *const cmd) __attribute__ ((deprecated));
inline static int di_execlog (const char *const cmd)
{
  return di_exec_shell_log (cmd);
}

/** @} */
#endif