/* gspawn.h - Process launching

 *

 *  Copyright 2000 Red Hat, Inc.

 *

 * GLib 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 of the

 * License, or (at your option) any later version.

 *

 * GLib 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 GLib; see the file COPYING.LIB.  If not, write

 * to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)

#error "Only <glib.h> can be included directly."

#endif

#ifndef __G_SPAWN_H__

#define __G_SPAWN_H__

#include <glib/gerror.h>

G_BEGIN_DECLS

/* I'm not sure I remember our proposed naming convention here. */

/**

 * G_SPAWN_ERROR:

 *

 * Error domain for spawning processes. Errors in this domain will

 * be from the #GSpawnError enumeration. See #GError for information on

 * error domains.

 */

#define G_SPAWN_ERROR g_spawn_error_quark ()

/**

 * GSpawnError:

 * @G_SPAWN_ERROR_FORK: Fork failed due to lack of memory.

 * @G_SPAWN_ERROR_READ: Read or select on pipes failed.

 * @G_SPAWN_ERROR_CHDIR: Changing to working directory failed.

 * @G_SPAWN_ERROR_ACCES: execv() returned <literal>EACCES</literal>

 * @G_SPAWN_ERROR_PERM: execv() returned <literal>EPERM</literal>

 * @G_SPAWN_ERROR_TOO_BIG: execv() returned <literal>E2BIG</literal>

 * @G_SPAWN_ERROR_2BIG: deprecated alias for %G_SPAWN_ERROR_TOO_BIG

 * @G_SPAWN_ERROR_NOEXEC: execv() returned <literal>ENOEXEC</literal>

 * @G_SPAWN_ERROR_NAMETOOLONG: execv() returned <literal>ENAMETOOLONG</literal>

 * @G_SPAWN_ERROR_NOENT: execv() returned <literal>ENOENT</literal>

 * @G_SPAWN_ERROR_NOMEM: execv() returned <literal>ENOMEM</literal>

 * @G_SPAWN_ERROR_NOTDIR: execv() returned <literal>ENOTDIR</literal>

 * @G_SPAWN_ERROR_LOOP: execv() returned <literal>ELOOP</literal>

 * @G_SPAWN_ERROR_TXTBUSY: execv() returned <literal>ETXTBUSY</literal>

 * @G_SPAWN_ERROR_IO: execv() returned <literal>EIO</literal>

 * @G_SPAWN_ERROR_NFILE: execv() returned <literal>ENFILE</literal>

 * @G_SPAWN_ERROR_MFILE: execv() returned <literal>EMFILE</literal>

 * @G_SPAWN_ERROR_INVAL: execv() returned <literal>EINVAL</literal>

 * @G_SPAWN_ERROR_ISDIR: execv() returned <literal>EISDIR</literal>

 * @G_SPAWN_ERROR_LIBBAD: execv() returned <literal>ELIBBAD</literal>

 * @G_SPAWN_ERROR_FAILED: Some other fatal failure,

 *   <literal>error->message</literal> should explain.

 *

 * Error codes returned by spawning processes.

 */

typedef enum

{

  G_SPAWN_ERROR_FORK,   /* fork failed due to lack of memory */

  G_SPAWN_ERROR_READ,   /* read or select on pipes failed */

  G_SPAWN_ERROR_CHDIR,  /* changing to working dir failed */

  G_SPAWN_ERROR_ACCES,  /* execv() returned EACCES */

  G_SPAWN_ERROR_PERM,   /* execv() returned EPERM */

  G_SPAWN_ERROR_TOO_BIG,/* execv() returned E2BIG */

#ifndef G_DISABLE_DEPRECATED

  G_SPAWN_ERROR_2BIG = G_SPAWN_ERROR_TOO_BIG,

#endif

  G_SPAWN_ERROR_NOEXEC, /* execv() returned ENOEXEC */

  G_SPAWN_ERROR_NAMETOOLONG, /* ""  "" ENAMETOOLONG */

  G_SPAWN_ERROR_NOENT,       /* ""  "" ENOENT */

  G_SPAWN_ERROR_NOMEM,       /* ""  "" ENOMEM */

  G_SPAWN_ERROR_NOTDIR,      /* ""  "" ENOTDIR */

  G_SPAWN_ERROR_LOOP,        /* ""  "" ELOOP   */

  G_SPAWN_ERROR_TXTBUSY,     /* ""  "" ETXTBUSY */

  G_SPAWN_ERROR_IO,          /* ""  "" EIO */

  G_SPAWN_ERROR_NFILE,       /* ""  "" ENFILE */

  G_SPAWN_ERROR_MFILE,       /* ""  "" EMFLE */

  G_SPAWN_ERROR_INVAL,       /* ""  "" EINVAL */

  G_SPAWN_ERROR_ISDIR,       /* ""  "" EISDIR */

  G_SPAWN_ERROR_LIBBAD,      /* ""  "" ELIBBAD */

  G_SPAWN_ERROR_FAILED       /* other fatal failure, error->message

                              * should explain

                              */

} GSpawnError;

/**

 * GSpawnChildSetupFunc:

 * @user_data: user data to pass to the function.

 *

 * Specifies the type of the setup function passed to g_spawn_async(),

 * g_spawn_sync() and g_spawn_async_with_pipes(), which can, in very

 * limited ways, be used to affect the child's execution.

 *

 * On POSIX platforms, the function is called in the child after GLib

 * has performed all the setup it plans to perform, but before calling

 * exec(). Actions taken in this function will only affect the child,

 * not the parent.

 *

 * On Windows, the function is called in the parent. Its usefulness on

 * Windows is thus questionable. In many cases executing the child setup

 * function in the parent can have ill effects, and you should be very

 * careful when porting software to Windows that uses child setup

 * functions.

 *

 * However, even on POSIX, you are extremely limited in what you can

 * safely do from a #GSpawnChildSetupFunc, because any mutexes that

 * were held by other threads in the parent process at the time of the

 * fork() will still be locked in the child process, and they will

 * never be unlocked (since the threads that held them don't exist in

 * the child). POSIX allows only async-signal-safe functions (see

 * <citerefentry><refentrytitle>signal</refentrytitle><manvolnum>7</manvolnum></citerefentry>)

 * to be called in the child between fork() and exec(), which

 * drastically limits the usefulness of child setup functions.

 *

 * In particular, it is not safe to call any function which may

 * call malloc(), which includes POSIX functions such as setenv().

 * If you need to set up the child environment differently from

 * the parent, you should use g_get_environ(), g_environ_setenv(),

 * and g_environ_unsetenv(), and then pass the complete environment

 * list to the <literal>g_spawn...</literal> function.

 */

typedef void (* GSpawnChildSetupFunc) (gpointer user_data);

/**

 * GSpawnFlags:

 * @G_SPAWN_LEAVE_DESCRIPTORS_OPEN: the parent's open file descriptors will be

 *   inherited by the child; otherwise all descriptors except stdin/stdout/stderr

 *   will be closed before calling exec() in the child.

 * @G_SPAWN_DO_NOT_REAP_CHILD: the child will not be automatically reaped; you

 *   must use g_child_watch_add() yourself (or call waitpid()

 *   or handle <literal>SIGCHLD</literal> yourself), or the child will become a zombie.

 * @G_SPAWN_SEARCH_PATH: <literal>argv[0]</literal> need not be an absolute path,

 *   it will be looked for in the user's <envar>PATH</envar>.

 * @G_SPAWN_STDOUT_TO_DEV_NULL: the child's standard output will be discarded,

 *   instead of going to the same location as the parent's standard output.

 * @G_SPAWN_STDERR_TO_DEV_NULL: the child's standard error will be discarded.

 * @G_SPAWN_CHILD_INHERITS_STDIN: the child will inherit the parent's standard

 *   input (by default, the child's standard input is attached to

 *   <filename>/dev/null</filename>).

 * @G_SPAWN_FILE_AND_ARGV_ZERO: the first element of <literal>argv</literal> is

 *   the file to execute, while the remaining elements are the actual argument

 *   vector to pass to the file. Normally g_spawn_async_with_pipes() uses

 *   <literal>argv[0]</literal> as the file to execute, and passes all of

 *   <literal>argv</literal> to the child.

 *

 * Flags passed to g_spawn_sync(), g_spawn_async() and g_spawn_async_with_pipes().

 */

typedef enum

{

  G_SPAWN_LEAVE_DESCRIPTORS_OPEN = 1 << 0,

  G_SPAWN_DO_NOT_REAP_CHILD      = 1 << 1,

  /* look for argv[0] in the path i.e. use execvp() */

  G_SPAWN_SEARCH_PATH            = 1 << 2,

  /* Dump output to /dev/null */

  G_SPAWN_STDOUT_TO_DEV_NULL     = 1 << 3,

  G_SPAWN_STDERR_TO_DEV_NULL     = 1 << 4,

  G_SPAWN_CHILD_INHERITS_STDIN   = 1 << 5,

  G_SPAWN_FILE_AND_ARGV_ZERO     = 1 << 6

} GSpawnFlags;

GQuark g_spawn_error_quark (void);

#ifndef __GTK_DOC_IGNORE__

#ifdef G_OS_WIN32

#define g_spawn_async g_spawn_async_utf8

#define g_spawn_async_with_pipes g_spawn_async_with_pipes_utf8

#define g_spawn_sync g_spawn_sync_utf8

#define g_spawn_command_line_sync g_spawn_command_line_sync_utf8

#define g_spawn_command_line_async g_spawn_command_line_async_utf8

#endif

#endif

gboolean g_spawn_async (const gchar           *working_directory,

                        gchar                **argv,

                        gchar                **envp,

                        GSpawnFlags            flags,

                        GSpawnChildSetupFunc   child_setup,

                        gpointer               user_data,

                        GPid                  *child_pid,

                        GError               **error);

/* Opens pipes for non-NULL standard_output, standard_input, standard_error,

 * and returns the parent's end of the pipes.

 */

gboolean g_spawn_async_with_pipes (const gchar          *working_directory,

                                   gchar               **argv,

                                   gchar               **envp,

                                   GSpawnFlags           flags,

                                   GSpawnChildSetupFunc  child_setup,

                                   gpointer              user_data,

                                   GPid                 *child_pid,

                                   gint                 *standard_input,

                                   gint                 *standard_output,

                                   gint                 *standard_error,

                                   GError              **error);

/* If standard_output or standard_error are non-NULL, the full

 * standard output or error of the command will be placed there.

 */

gboolean g_spawn_sync         (const gchar          *working_directory,

                               gchar               **argv,

                               gchar               **envp,

                               GSpawnFlags           flags,

                               GSpawnChildSetupFunc  child_setup,

                               gpointer              user_data,

                               gchar               **standard_output,

                               gchar               **standard_error,

                               gint                 *exit_status,

                               GError              **error);

gboolean g_spawn_command_line_sync  (const gchar          *command_line,

                                     gchar               **standard_output,

                                     gchar               **standard_error,

                                     gint                 *exit_status,

                                     GError              **error);

gboolean g_spawn_command_line_async (const gchar          *command_line,

                                     GError              **error);

void g_spawn_close_pid (GPid pid);

G_END_DECLS

#endif /* __G_SPAWN_H__ */