Imported Upstream version 2.73.3
[platform/upstream/glib.git] / glib / gspawn.h
1 /* gspawn.h - Process launching
2  *
3  *  Copyright 2000 Red Hat, Inc.
4  *
5  * SPDX-License-Identifier: LGPL-2.1-or-later
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, see <http://www.gnu.org/licenses/>.
19  */
20
21 #ifndef __G_SPAWN_H__
22 #define __G_SPAWN_H__
23
24 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
25 #error "Only <glib.h> can be included directly."
26 #endif
27
28 #include <glib/gerror.h>
29
30 G_BEGIN_DECLS
31
32
33 /* I'm not sure I remember our proposed naming convention here. */
34 /**
35  * G_SPAWN_ERROR:
36  *
37  * Error domain for spawning processes. Errors in this domain will
38  * be from the #GSpawnError enumeration. See #GError for information on
39  * error domains.
40  */
41 #define G_SPAWN_ERROR g_spawn_error_quark ()
42
43 /**
44  * GSpawnError:
45  * @G_SPAWN_ERROR_FORK: Fork failed due to lack of memory.
46  * @G_SPAWN_ERROR_READ: Read or select on pipes failed.
47  * @G_SPAWN_ERROR_CHDIR: Changing to working directory failed.
48  * @G_SPAWN_ERROR_ACCES: execv() returned `EACCES`
49  * @G_SPAWN_ERROR_PERM: execv() returned `EPERM`
50  * @G_SPAWN_ERROR_TOO_BIG: execv() returned `E2BIG`
51  * @G_SPAWN_ERROR_2BIG: deprecated alias for %G_SPAWN_ERROR_TOO_BIG (deprecated since GLib 2.32)
52  * @G_SPAWN_ERROR_NOEXEC: execv() returned `ENOEXEC`
53  * @G_SPAWN_ERROR_NAMETOOLONG: execv() returned `ENAMETOOLONG`
54  * @G_SPAWN_ERROR_NOENT: execv() returned `ENOENT`
55  * @G_SPAWN_ERROR_NOMEM: execv() returned `ENOMEM`
56  * @G_SPAWN_ERROR_NOTDIR: execv() returned `ENOTDIR`
57  * @G_SPAWN_ERROR_LOOP: execv() returned `ELOOP`
58  * @G_SPAWN_ERROR_TXTBUSY: execv() returned `ETXTBUSY`
59  * @G_SPAWN_ERROR_IO: execv() returned `EIO`
60  * @G_SPAWN_ERROR_NFILE: execv() returned `ENFILE`
61  * @G_SPAWN_ERROR_MFILE: execv() returned `EMFILE`
62  * @G_SPAWN_ERROR_INVAL: execv() returned `EINVAL`
63  * @G_SPAWN_ERROR_ISDIR: execv() returned `EISDIR`
64  * @G_SPAWN_ERROR_LIBBAD: execv() returned `ELIBBAD`
65  * @G_SPAWN_ERROR_FAILED: Some other fatal failure,
66  *   `error->message` should explain.
67  *
68  * Error codes returned by spawning processes.
69  */
70 typedef enum
71 {
72   G_SPAWN_ERROR_FORK,   /* fork failed due to lack of memory */
73   G_SPAWN_ERROR_READ,   /* read or select on pipes failed */
74   G_SPAWN_ERROR_CHDIR,  /* changing to working dir failed */
75   G_SPAWN_ERROR_ACCES,  /* execv() returned EACCES */
76   G_SPAWN_ERROR_PERM,   /* execv() returned EPERM */
77   G_SPAWN_ERROR_TOO_BIG,/* execv() returned E2BIG */
78   G_SPAWN_ERROR_2BIG GLIB_DEPRECATED_ENUMERATOR_IN_2_32_FOR(G_SPAWN_ERROR_TOO_BIG) = G_SPAWN_ERROR_TOO_BIG,
79   G_SPAWN_ERROR_NOEXEC, /* execv() returned ENOEXEC */
80   G_SPAWN_ERROR_NAMETOOLONG, /* ""  "" ENAMETOOLONG */
81   G_SPAWN_ERROR_NOENT,       /* ""  "" ENOENT */
82   G_SPAWN_ERROR_NOMEM,       /* ""  "" ENOMEM */
83   G_SPAWN_ERROR_NOTDIR,      /* ""  "" ENOTDIR */
84   G_SPAWN_ERROR_LOOP,        /* ""  "" ELOOP   */
85   G_SPAWN_ERROR_TXTBUSY,     /* ""  "" ETXTBUSY */
86   G_SPAWN_ERROR_IO,          /* ""  "" EIO */
87   G_SPAWN_ERROR_NFILE,       /* ""  "" ENFILE */
88   G_SPAWN_ERROR_MFILE,       /* ""  "" EMFLE */
89   G_SPAWN_ERROR_INVAL,       /* ""  "" EINVAL */
90   G_SPAWN_ERROR_ISDIR,       /* ""  "" EISDIR */
91   G_SPAWN_ERROR_LIBBAD,      /* ""  "" ELIBBAD */
92   G_SPAWN_ERROR_FAILED       /* other fatal failure, error->message
93                               * should explain
94                               */
95 } GSpawnError;
96
97 /**
98  * G_SPAWN_EXIT_ERROR:
99  *
100  * Error domain used by g_spawn_check_wait_status().  The code
101  * will be the program exit code.
102  */
103 #define G_SPAWN_EXIT_ERROR g_spawn_exit_error_quark ()
104
105 /**
106  * GSpawnChildSetupFunc:
107  * @user_data: user data to pass to the function.
108  *
109  * Specifies the type of the setup function passed to g_spawn_async(),
110  * g_spawn_sync() and g_spawn_async_with_pipes(), which can, in very
111  * limited ways, be used to affect the child's execution.
112  *
113  * On POSIX platforms, the function is called in the child after GLib
114  * has performed all the setup it plans to perform, but before calling
115  * exec(). Actions taken in this function will only affect the child,
116  * not the parent.
117  *
118  * On Windows, the function is called in the parent. Its usefulness on
119  * Windows is thus questionable. In many cases executing the child setup
120  * function in the parent can have ill effects, and you should be very
121  * careful when porting software to Windows that uses child setup
122  * functions.
123  *
124  * However, even on POSIX, you are extremely limited in what you can
125  * safely do from a #GSpawnChildSetupFunc, because any mutexes that were
126  * held by other threads in the parent process at the time of the fork()
127  * will still be locked in the child process, and they will never be
128  * unlocked (since the threads that held them don't exist in the child).
129  * POSIX allows only async-signal-safe functions (see signal(7)) to be
130  * called in the child between fork() and exec(), which drastically limits
131  * the usefulness of child setup functions.
132  *
133  * In particular, it is not safe to call any function which may
134  * call malloc(), which includes POSIX functions such as setenv().
135  * If you need to set up the child environment differently from
136  * the parent, you should use g_get_environ(), g_environ_setenv(),
137  * and g_environ_unsetenv(), and then pass the complete environment
138  * list to the `g_spawn...` function.
139  */
140 typedef void (* GSpawnChildSetupFunc) (gpointer user_data);
141
142 /**
143  * GSpawnFlags:
144  * @G_SPAWN_DEFAULT: no flags, default behaviour
145  * @G_SPAWN_LEAVE_DESCRIPTORS_OPEN: the parent's open file descriptors will
146  *     be inherited by the child; otherwise all descriptors except stdin,
147  *     stdout and stderr will be closed before calling exec() in the child.
148  * @G_SPAWN_DO_NOT_REAP_CHILD: the child will not be automatically reaped;
149  *     you must use g_child_watch_add() yourself (or call waitpid() or handle
150  *     `SIGCHLD` yourself), or the child will become a zombie.
151  * @G_SPAWN_SEARCH_PATH: `argv[0]` need not be an absolute path, it will be
152  *     looked for in the user's `PATH`.
153  * @G_SPAWN_STDOUT_TO_DEV_NULL: the child's standard output will be discarded,
154  *     instead of going to the same location as the parent's standard output.
155  * @G_SPAWN_STDERR_TO_DEV_NULL: the child's standard error will be discarded.
156  * @G_SPAWN_CHILD_INHERITS_STDIN: the child will inherit the parent's standard
157  *     input (by default, the child's standard input is attached to `/dev/null`).
158  * @G_SPAWN_FILE_AND_ARGV_ZERO: the first element of `argv` is the file to
159  *     execute, while the remaining elements are the actual argument vector
160  *     to pass to the file. Normally g_spawn_async_with_pipes() uses `argv[0]`
161  *     as the file to execute, and passes all of `argv` to the child.
162  * @G_SPAWN_SEARCH_PATH_FROM_ENVP: if `argv[0]` is not an absolute path,
163  *     it will be looked for in the `PATH` from the passed child environment.
164  *     Since: 2.34
165  * @G_SPAWN_CLOEXEC_PIPES: create all pipes with the `O_CLOEXEC` flag set.
166  *     Since: 2.40
167  * @G_SPAWN_CHILD_INHERITS_STDOUT: the child will inherit the parent's standard output.
168  *     Since: 2.74
169  * @G_SPAWN_CHILD_INHERITS_STDERR: the child will inherit the parent's standard error.
170  *     Since: 2.74
171  * @G_SPAWN_STDIN_FROM_DEV_NULL: the child's standard input is attached to `/dev/null`.
172  *     Since: 2.74
173  *
174  * Flags passed to g_spawn_sync(), g_spawn_async() and g_spawn_async_with_pipes().
175  */
176 typedef enum
177 {
178   G_SPAWN_DEFAULT                = 0,
179   G_SPAWN_LEAVE_DESCRIPTORS_OPEN = 1 << 0,
180   G_SPAWN_DO_NOT_REAP_CHILD      = 1 << 1,
181   /* look for argv[0] in the path i.e. use execvp() */
182   G_SPAWN_SEARCH_PATH            = 1 << 2,
183   /* Dump output to /dev/null */
184   G_SPAWN_STDOUT_TO_DEV_NULL     = 1 << 3,
185   G_SPAWN_STDERR_TO_DEV_NULL     = 1 << 4,
186   G_SPAWN_CHILD_INHERITS_STDIN   = 1 << 5,
187   G_SPAWN_FILE_AND_ARGV_ZERO     = 1 << 6,
188   G_SPAWN_SEARCH_PATH_FROM_ENVP  = 1 << 7,
189   G_SPAWN_CLOEXEC_PIPES          = 1 << 8,
190
191   /**
192    * G_SPAWN_CHILD_INHERITS_STDOUT:
193    *
194    * The child will inherit the parent's standard output.
195    *
196    * Since: 2.74
197    */
198   G_SPAWN_CHILD_INHERITS_STDOUT  = 1 << 9,
199
200   /**
201    * G_SPAWN_CHILD_INHERITS_STDERR:
202    *
203    * The child will inherit the parent's standard error.
204    *
205    * Since: 2.74
206    */
207   G_SPAWN_CHILD_INHERITS_STDERR  = 1 << 10,
208
209   /**
210    * G_SPAWN_STDIN_FROM_DEV_NULL:
211    *
212    * The child's standard input is attached to `/dev/null`.
213    *
214    * Since: 2.74
215    */
216   G_SPAWN_STDIN_FROM_DEV_NULL    = 1 << 11
217 } GSpawnFlags;
218
219 GLIB_AVAILABLE_IN_ALL
220 GQuark g_spawn_error_quark (void);
221 GLIB_AVAILABLE_IN_ALL
222 GQuark g_spawn_exit_error_quark (void);
223
224 GLIB_AVAILABLE_IN_ALL
225 gboolean g_spawn_async (const gchar           *working_directory,
226                         gchar                **argv,
227                         gchar                **envp,
228                         GSpawnFlags            flags,
229                         GSpawnChildSetupFunc   child_setup,
230                         gpointer               user_data,
231                         GPid                  *child_pid,
232                         GError               **error);
233
234
235 /* Opens pipes for non-NULL standard_output, standard_input, standard_error,
236  * and returns the parent's end of the pipes.
237  */
238 GLIB_AVAILABLE_IN_ALL
239 gboolean g_spawn_async_with_pipes (const gchar          *working_directory,
240                                    gchar               **argv,
241                                    gchar               **envp,
242                                    GSpawnFlags           flags,
243                                    GSpawnChildSetupFunc  child_setup,
244                                    gpointer              user_data,
245                                    GPid                 *child_pid,
246                                    gint                 *standard_input,
247                                    gint                 *standard_output,
248                                    gint                 *standard_error,
249                                    GError              **error);
250
251 GLIB_AVAILABLE_IN_2_68
252 gboolean g_spawn_async_with_pipes_and_fds (const gchar          *working_directory,
253                                            const gchar * const  *argv,
254                                            const gchar * const  *envp,
255                                            GSpawnFlags           flags,
256                                            GSpawnChildSetupFunc  child_setup,
257                                            gpointer              user_data,
258                                            gint                  stdin_fd,
259                                            gint                  stdout_fd,
260                                            gint                  stderr_fd,
261                                            const gint           *source_fds,
262                                            const gint           *target_fds,
263                                            gsize                 n_fds,
264                                            GPid                 *child_pid_out,
265                                            gint                 *stdin_pipe_out,
266                                            gint                 *stdout_pipe_out,
267                                            gint                 *stderr_pipe_out,
268                                            GError              **error);
269
270 /* Lets you provide fds for stdin/stdout/stderr */
271 GLIB_AVAILABLE_IN_2_58
272 gboolean g_spawn_async_with_fds (const gchar          *working_directory,
273                                  gchar               **argv,
274                                  gchar               **envp,
275                                  GSpawnFlags           flags,
276                                  GSpawnChildSetupFunc  child_setup,
277                                  gpointer              user_data,
278                                  GPid                 *child_pid,
279                                  gint                  stdin_fd,
280                                  gint                  stdout_fd,
281                                  gint                  stderr_fd,
282                                  GError              **error);
283
284 /* If standard_output or standard_error are non-NULL, the full
285  * standard output or error of the command will be placed there.
286  */
287
288 GLIB_AVAILABLE_IN_ALL
289 gboolean g_spawn_sync         (const gchar          *working_directory,
290                                gchar               **argv,
291                                gchar               **envp,
292                                GSpawnFlags           flags,
293                                GSpawnChildSetupFunc  child_setup,
294                                gpointer              user_data,
295                                gchar               **standard_output,
296                                gchar               **standard_error,
297                                gint                 *wait_status,
298                                GError              **error);
299
300 GLIB_AVAILABLE_IN_ALL
301 gboolean g_spawn_command_line_sync  (const gchar          *command_line,
302                                      gchar               **standard_output,
303                                      gchar               **standard_error,
304                                      gint                 *wait_status,
305                                      GError              **error);
306 GLIB_AVAILABLE_IN_ALL
307 gboolean g_spawn_command_line_async (const gchar          *command_line,
308                                      GError              **error);
309
310 GLIB_AVAILABLE_IN_2_70
311 gboolean g_spawn_check_wait_status (gint      wait_status,
312                                     GError  **error);
313
314 GLIB_DEPRECATED_IN_2_70_FOR(g_spawn_check_wait_status)
315 gboolean g_spawn_check_exit_status (gint      wait_status,
316                                     GError  **error);
317
318 GLIB_AVAILABLE_IN_ALL
319 void g_spawn_close_pid (GPid pid);
320
321 G_END_DECLS
322
323 #endif /* __G_SPAWN_H__ */