1 /* gspawn.c - Process launching
3 * Copyright 2000 Red Hat, Inc.
4 * g_execvpe implementation based on GNU libc execvp:
5 * Copyright 1991, 92, 95, 96, 97, 98, 99 Free Software Foundation, Inc.
7 * GLib is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
12 * GLib 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with GLib; see the file COPYING.LIB. If not, write
19 * to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
26 #include <sys/types.h>
34 #ifdef HAVE_SYS_SELECT_H
35 #include <sys/select.h>
36 #endif /* HAVE_SYS_SELECT_H */
43 static gint
g_execute (const gchar
*file
,
46 gboolean search_path
);
48 static gboolean
make_pipe (gint p
[2],
50 static gboolean
fork_exec_with_pipes (gboolean intermediate_child
,
51 const gchar
*working_directory
,
54 gboolean close_descriptors
,
56 gboolean stdout_to_null
,
57 gboolean stderr_to_null
,
58 gboolean child_inherits_stdin
,
59 gboolean file_and_argv_zero
,
60 GSpawnChildSetupFunc child_setup
,
64 gint
*standard_output
,
69 g_spawn_error_quark (void)
71 static GQuark quark
= 0;
73 quark
= g_quark_from_static_string ("g-exec-error-quark");
79 * @working_directory: child's current working directory, or %NULL to inherit parent's
80 * @argv: child's argument vector
81 * @envp: child's environment, or %NULL to inherit parent's
82 * @flags: flags from #GSpawnFlags
83 * @child_setup: function to run in the child just before exec()
84 * @user_data: user data for @child_setup
85 * @child_pid: return location for child process ID, or %NULL
86 * @error: return location for error
88 * See g_spawn_async_with_pipes() for a full description; this function
89 * simply calls the g_spawn_async_with_pipes() without any pipes.
91 * Return value: %TRUE on success, %FALSE if error is set
94 g_spawn_async (const gchar
*working_directory
,
98 GSpawnChildSetupFunc child_setup
,
103 g_return_val_if_fail (argv
!= NULL
, FALSE
);
105 return g_spawn_async_with_pipes (working_directory
,
115 /* Avoids a danger in threaded situations (calling close()
116 * on a file descriptor twice, and another thread has
117 * re-opened it since the first close)
120 close_and_invalidate (gint
*fd
)
137 READ_FAILED
= 0, /* FALSE */
143 read_data (GString
*str
,
152 bytes
= read (fd
, buf
, 4096);
158 g_string_append_len (str
, buf
, bytes
);
161 else if (bytes
< 0 && errno
== EINTR
)
168 _("Failed to read data from child process (%s)"),
179 * @working_directory: child's current working directory, or %NULL to inherit parent's
180 * @argv: child's argument vector
181 * @envp: child's environment, or %NULL to inherit parent's
182 * @flags: flags from #GSpawnFlags
183 * @child_setup: function to run in the child just before exec()
184 * @user_data: user data for @child_setup
185 * @standard_output: return location for child output
186 * @standard_error: return location for child error messages
187 * @exit_status: return location for child exit status, as returned by waitpid()
188 * @error: return location for error
190 * Executes a child synchronously (waits for the child to exit before returning).
191 * All output from the child is stored in @standard_output and @standard_error,
192 * if those parameters are non-%NULL. If @exit_status is non-%NULL, the exit
193 * status of the child is stored there as it would be returned by
194 * waitpid(); standard UNIX macros such as WIFEXITED() and WEXITSTATUS()
195 * must be used to evaluate the exit status. If an error occurs, no data is
196 * returned in @standard_output, @standard_error, or @exit_status.
198 * This function calls g_spawn_async_with_pipes() internally; see that
199 * function for full details on the other parameters and details on
200 * how these functions work on Windows.
202 * Return value: %TRUE on success, %FALSE if an error was set.
205 g_spawn_sync (const gchar
*working_directory
,
209 GSpawnChildSetupFunc child_setup
,
211 gchar
**standard_output
,
212 gchar
**standard_error
,
221 GString
*outstr
= NULL
;
222 GString
*errstr
= NULL
;
226 g_return_val_if_fail (argv
!= NULL
, FALSE
);
227 g_return_val_if_fail (!(flags
& G_SPAWN_DO_NOT_REAP_CHILD
), FALSE
);
228 g_return_val_if_fail (standard_output
== NULL
||
229 !(flags
& G_SPAWN_STDOUT_TO_DEV_NULL
), FALSE
);
230 g_return_val_if_fail (standard_error
== NULL
||
231 !(flags
& G_SPAWN_STDERR_TO_DEV_NULL
), FALSE
);
233 /* Just to ensure segfaults if callers try to use
234 * these when an error is reported.
237 *standard_output
= NULL
;
240 *standard_error
= NULL
;
242 if (!fork_exec_with_pipes (FALSE
,
246 !(flags
& G_SPAWN_LEAVE_DESCRIPTORS_OPEN
),
247 (flags
& G_SPAWN_SEARCH_PATH
) != 0,
248 (flags
& G_SPAWN_STDOUT_TO_DEV_NULL
) != 0,
249 (flags
& G_SPAWN_STDERR_TO_DEV_NULL
) != 0,
250 (flags
& G_SPAWN_CHILD_INHERITS_STDIN
) != 0,
251 (flags
& G_SPAWN_FILE_AND_ARGV_ZERO
) != 0,
256 standard_output
? &outpipe
: NULL
,
257 standard_error
? &errpipe
: NULL
,
261 /* Read data from child. */
267 outstr
= g_string_new (NULL
);
272 errstr
= g_string_new (NULL
);
275 /* Read data until we get EOF on both pipes. */
284 FD_SET (outpipe
, &fds
);
286 FD_SET (errpipe
, &fds
);
288 ret
= select (MAX (outpipe
, errpipe
) + 1,
291 NULL
/* no timeout */);
293 if (ret
< 0 && errno
!= EINTR
)
300 _("Unexpected error in select() reading data from a child process (%s)"),
306 if (outpipe
>= 0 && FD_ISSET (outpipe
, &fds
))
308 switch (read_data (outstr
, outpipe
, error
))
314 close_and_invalidate (&outpipe
);
325 if (errpipe
>= 0 && FD_ISSET (errpipe
, &fds
))
327 switch (read_data (errstr
, errpipe
, error
))
333 close_and_invalidate (&errpipe
);
345 /* These should only be open still if we had an error. */
348 close_and_invalidate (&outpipe
);
350 close_and_invalidate (&errpipe
);
352 /* Wait for child to exit, even if we have
357 ret
= waitpid (pid
, &status
, 0);
363 else if (errno
== ECHILD
)
367 g_warning ("In call to g_spawn_sync(), exit status of a child process was requested but SIGCHLD action was set to SIG_IGN and ECHILD was received by waitpid(), so exit status can't be returned. This is a bug in the program calling g_spawn_sync(); either don't request the exit status, or don't set the SIGCHLD action.");
371 /* We don't need the exit status. */
376 if (!failed
) /* avoid error pileups */
383 _("Unexpected error in waitpid() (%s)"),
392 g_string_free (outstr
, TRUE
);
394 g_string_free (errstr
, TRUE
);
401 *exit_status
= status
;
404 *standard_output
= g_string_free (outstr
, FALSE
);
407 *standard_error
= g_string_free (errstr
, FALSE
);
414 * g_spawn_async_with_pipes:
415 * @working_directory: child's current working directory, or %NULL to inherit parent's, in the GLib file name encoding
416 * @argv: child's argument vector, in the GLib file name encoding
417 * @envp: child's environment, or %NULL to inherit parent's, in the GLib file name encoding
418 * @flags: flags from #GSpawnFlags
419 * @child_setup: function to run in the child just before exec()
420 * @user_data: user data for @child_setup
421 * @child_pid: return location for child process ID, or %NULL
422 * @standard_input: return location for file descriptor to write to child's stdin, or %NULL
423 * @standard_output: return location for file descriptor to read child's stdout, or %NULL
424 * @standard_error: return location for file descriptor to read child's stderr, or %NULL
425 * @error: return location for error
427 * Executes a child program asynchronously (your program will not
428 * block waiting for the child to exit). The child program is
429 * specified by the only argument that must be provided, @argv. @argv
430 * should be a %NULL-terminated array of strings, to be passed as the
431 * argument vector for the child. The first string in @argv is of
432 * course the name of the program to execute. By default, the name of
433 * the program must be a full path; the <envar>PATH</envar> shell variable
434 * will only be searched if you pass the %G_SPAWN_SEARCH_PATH flag.
436 * On Windows, note that all the string or string vector arguments to
437 * this function and the other g_spawn*() functions are in UTF-8, the
438 * GLib file name encoding. Unicode characters that are not part of
439 * the system codepage passed in argument vectors will be correctly
440 * available in the spawned program only if it uses wide character API
441 * to retrieve its command line. For C programs built with Microsoft's
442 * tools it is enough to make the program have a wmain() instead of
443 * main(). wmain() has a wide character argument vector as parameter.
445 * At least currently, mingw doesn't support wmain(), so if you use
446 * mingw to develop the spawned program, it will have to call the
447 * undocumented function __wgetmainargs() to get the wide character
448 * argument vector and environment. See gspawn-win32-helper.c in the
449 * GLib sources or init.c in the mingw runtime sources for a prototype
450 * for that function. Alternatively, you can retrieve the Win32 system
451 * level wide character command line passed to the spawned program
452 * using the GetCommandLineW() function.
454 * On Windows the low-level child process creation API
455 * <function>CreateProcess()</function> doesn't use argument vectors,
456 * but a command line. The C runtime library's
457 * <function>spawn*()</function> family of functions (which
458 * g_spawn_async_with_pipes() eventually calls) paste the argument
459 * vector elements together into a command line, and the C runtime startup code
460 * does a corresponding reconstruction of an argument vector from the
461 * command line, to be passed to main(). Complications arise when you have
462 * argument vector elements that contain spaces of double quotes. The
463 * <function>spawn*()</function> functions don't do any quoting or
464 * escaping, but on the other hand the startup code does do unquoting
465 * and unescaping in order to enable receiving arguments with embedded
466 * spaces or double quotes. To work around this asymmetry,
467 * g_spawn_async_with_pipes() will do quoting and escaping on argument
468 * vector elements that need it before calling the C runtime
471 * @envp is a %NULL-terminated array of strings, where each string
472 * has the form <literal>KEY=VALUE</literal>. This will become
473 * the child's environment. If @envp is %NULL, the child inherits its
474 * parent's environment.
476 * @flags should be the bitwise OR of any flags you want to affect the
477 * function's behaviour. The %G_SPAWN_DO_NOT_REAP_CHILD means that
478 * the child will not automatically be reaped; you must use a
479 * #GChildWatch source to be notified about the death of the child
480 * process. Eventually you must call g_spawn_close_pid() on the
481 * @child_pid, in order to free resources which may be associated
482 * with the child process. (On Unix, using a #GChildWatch source is
483 * equivalent to calling waitpid() or handling the %SIGCHLD signal
484 * manually. On Windows, calling g_spawn_close_pid() is equivalent
485 * to calling CloseHandle() on the process handle returned in
488 * %G_SPAWN_LEAVE_DESCRIPTORS_OPEN means that the parent's open file
489 * descriptors will be inherited by the child; otherwise all
490 * descriptors except stdin/stdout/stderr will be closed before
491 * calling exec() in the child. %G_SPAWN_SEARCH_PATH
492 * means that <literal>argv[0]</literal> need not be an absolute path, it
493 * will be looked for in the user's <envar>PATH</envar>.
494 * %G_SPAWN_STDOUT_TO_DEV_NULL means that the child's standard output will
495 * be discarded, instead of going to the same location as the parent's
496 * standard output. If you use this flag, @standard_output must be %NULL.
497 * %G_SPAWN_STDERR_TO_DEV_NULL means that the child's standard error
498 * will be discarded, instead of going to the same location as the parent's
499 * standard error. If you use this flag, @standard_error must be %NULL.
500 * %G_SPAWN_CHILD_INHERITS_STDIN means that the child will inherit the parent's
501 * standard input (by default, the child's standard input is attached to
502 * /dev/null). If you use this flag, @standard_input must be %NULL.
503 * %G_SPAWN_FILE_AND_ARGV_ZERO means that the first element of @argv is
504 * the file to execute, while the remaining elements are the
505 * actual argument vector to pass to the file. Normally
506 * g_spawn_async_with_pipes() uses @argv[0] as the file to execute, and
507 * passes all of @argv to the child.
509 * @child_setup and @user_data are a function and user data. On POSIX
510 * platforms, the function is called in the child after GLib has
511 * performed all the setup it plans to perform (including creating
512 * pipes, closing file descriptors, etc.) but before calling
513 * exec(). That is, @child_setup is called just
514 * before calling exec() in the child. Obviously
515 * actions taken in this function will only affect the child, not the
516 * parent. On Windows, there is no separate fork() and exec()
517 * functionality. Child processes are created and run with
518 * a single API call, CreateProcess(). @child_setup is
519 * called in the parent process just before creating the child
520 * process. You should carefully consider what you do in @child_setup
521 * if you intend your software to be portable to Windows.
523 * If non-%NULL, @child_pid will on Unix be filled with the child's
524 * process ID. You can use the process ID to send signals to the
525 * child, or to waitpid() if you specified the
526 * %G_SPAWN_DO_NOT_REAP_CHILD flag. On Windows, @child_pid will be
527 * filled with a handle to the child process only if you specified the
528 * %G_SPAWN_DO_NOT_REAP_CHILD flag. You can then access the child
529 * process using the Win32 API, for example wait for its termination
530 * with the <function>WaitFor*()</function> functions, or examine its
531 * exit code with GetExitCodeProcess(). You should close the handle
532 * with CloseHandle() or g_spawn_close_pid() when you no longer need it.
534 * If non-%NULL, the @standard_input, @standard_output, @standard_error
535 * locations will be filled with file descriptors for writing to the child's
536 * standard input or reading from its standard output or standard error.
537 * The caller of g_spawn_async_with_pipes() must close these file descriptors
538 * when they are no longer in use. If these parameters are %NULL, the corresponding
539 * pipe won't be created.
541 * If @standard_input is NULL, the child's standard input is attached to /dev/null
542 * unless %G_SPAWN_CHILD_INHERITS_STDIN is set.
544 * If @standard_error is NULL, the child's standard error goes to the same location
545 * as the parent's standard error unless %G_SPAWN_STDERR_TO_DEV_NULL is set.
547 * If @standard_output is NULL, the child's standard output goes to the same location
548 * as the parent's standard output unless %G_SPAWN_STDOUT_TO_DEV_NULL is set.
550 * @error can be %NULL to ignore errors, or non-%NULL to report errors.
551 * If an error is set, the function returns %FALSE. Errors
552 * are reported even if they occur in the child (for example if the
553 * executable in <literal>argv[0]</literal> is not found). Typically
554 * the <literal>message</literal> field of returned errors should be displayed
555 * to users. Possible errors are those from the #G_SPAWN_ERROR domain.
557 * If an error occurs, @child_pid, @standard_input, @standard_output,
558 * and @standard_error will not be filled with valid values.
560 * If @child_pid is not %NULL and an error does not occur then the returned
561 * pid must be closed using g_spawn_close_pid().
563 * Return value: %TRUE on success, %FALSE if an error was set
566 g_spawn_async_with_pipes (const gchar
*working_directory
,
570 GSpawnChildSetupFunc child_setup
,
573 gint
*standard_input
,
574 gint
*standard_output
,
575 gint
*standard_error
,
578 g_return_val_if_fail (argv
!= NULL
, FALSE
);
579 g_return_val_if_fail (standard_output
== NULL
||
580 !(flags
& G_SPAWN_STDOUT_TO_DEV_NULL
), FALSE
);
581 g_return_val_if_fail (standard_error
== NULL
||
582 !(flags
& G_SPAWN_STDERR_TO_DEV_NULL
), FALSE
);
583 /* can't inherit stdin if we have an input pipe. */
584 g_return_val_if_fail (standard_input
== NULL
||
585 !(flags
& G_SPAWN_CHILD_INHERITS_STDIN
), FALSE
);
587 return fork_exec_with_pipes (!(flags
& G_SPAWN_DO_NOT_REAP_CHILD
),
591 !(flags
& G_SPAWN_LEAVE_DESCRIPTORS_OPEN
),
592 (flags
& G_SPAWN_SEARCH_PATH
) != 0,
593 (flags
& G_SPAWN_STDOUT_TO_DEV_NULL
) != 0,
594 (flags
& G_SPAWN_STDERR_TO_DEV_NULL
) != 0,
595 (flags
& G_SPAWN_CHILD_INHERITS_STDIN
) != 0,
596 (flags
& G_SPAWN_FILE_AND_ARGV_ZERO
) != 0,
607 * g_spawn_command_line_sync:
608 * @command_line: a command line
609 * @standard_output: return location for child output
610 * @standard_error: return location for child errors
611 * @exit_status: return location for child exit status, as returned by waitpid()
612 * @error: return location for errors
614 * A simple version of g_spawn_sync() with little-used parameters
615 * removed, taking a command line instead of an argument vector. See
616 * g_spawn_sync() for full details. @command_line will be parsed by
617 * g_shell_parse_argv(). Unlike g_spawn_sync(), the %G_SPAWN_SEARCH_PATH flag
618 * is enabled. Note that %G_SPAWN_SEARCH_PATH can have security
619 * implications, so consider using g_spawn_sync() directly if
620 * appropriate. Possible errors are those from g_spawn_sync() and those
621 * from g_shell_parse_argv().
623 * If @exit_status is non-%NULL, the exit status of the child is stored there as
624 * it would be returned by waitpid(); standard UNIX macros such as WIFEXITED()
625 * and WEXITSTATUS() must be used to evaluate the exit status.
627 * On Windows, please note the implications of g_shell_parse_argv()
628 * parsing @command_line. Parsing is done according to Unix shell rules, not
629 * Windows command interpreter rules.
630 * Space is a separator, and backslashes are
631 * special. Thus you cannot simply pass a @command_line containing
632 * canonical Windows paths, like "c:\\program files\\app\\app.exe", as
633 * the backslashes will be eaten, and the space will act as a
634 * separator. You need to enclose such paths with single quotes, like
635 * "'c:\\program files\\app\\app.exe' 'e:\\folder\\argument.txt'".
637 * Return value: %TRUE on success, %FALSE if an error was set
640 g_spawn_command_line_sync (const gchar
*command_line
,
641 gchar
**standard_output
,
642 gchar
**standard_error
,
649 g_return_val_if_fail (command_line
!= NULL
, FALSE
);
651 if (!g_shell_parse_argv (command_line
,
656 retval
= g_spawn_sync (NULL
,
672 * g_spawn_command_line_async:
673 * @command_line: a command line
674 * @error: return location for errors
676 * A simple version of g_spawn_async() that parses a command line with
677 * g_shell_parse_argv() and passes it to g_spawn_async(). Runs a
678 * command line in the background. Unlike g_spawn_async(), the
679 * %G_SPAWN_SEARCH_PATH flag is enabled, other flags are not. Note
680 * that %G_SPAWN_SEARCH_PATH can have security implications, so
681 * consider using g_spawn_async() directly if appropriate. Possible
682 * errors are those from g_shell_parse_argv() and g_spawn_async().
684 * The same concerns on Windows apply as for g_spawn_command_line_sync().
686 * Return value: %TRUE on success, %FALSE if error is set.
689 g_spawn_command_line_async (const gchar
*command_line
,
695 g_return_val_if_fail (command_line
!= NULL
, FALSE
);
697 if (!g_shell_parse_argv (command_line
,
702 retval
= g_spawn_async (NULL
,
716 exec_err_to_g_error (gint en
)
722 return G_SPAWN_ERROR_ACCES
;
728 return G_SPAWN_ERROR_PERM
;
734 return G_SPAWN_ERROR_2BIG
;
740 return G_SPAWN_ERROR_NOEXEC
;
746 return G_SPAWN_ERROR_NAMETOOLONG
;
752 return G_SPAWN_ERROR_NOENT
;
758 return G_SPAWN_ERROR_NOMEM
;
764 return G_SPAWN_ERROR_NOTDIR
;
770 return G_SPAWN_ERROR_LOOP
;
776 return G_SPAWN_ERROR_TXTBUSY
;
782 return G_SPAWN_ERROR_IO
;
788 return G_SPAWN_ERROR_NFILE
;
794 return G_SPAWN_ERROR_MFILE
;
800 return G_SPAWN_ERROR_INVAL
;
806 return G_SPAWN_ERROR_ISDIR
;
812 return G_SPAWN_ERROR_LIBBAD
;
817 return G_SPAWN_ERROR_FAILED
;
823 write_all (gint fd
, gconstpointer vbuf
, gsize to_write
)
825 gchar
*buf
= (gchar
*) vbuf
;
829 gssize count
= write (fd
, buf
, to_write
);
846 write_err_and_exit (gint fd
, gint msg
)
850 write_all (fd
, &msg
, sizeof(msg
));
851 write_all (fd
, &en
, sizeof(en
));
857 set_cloexec (gint fd
)
859 fcntl (fd
, F_SETFD
, FD_CLOEXEC
);
863 sane_dup2 (gint fd1
, gint fd2
)
868 ret
= dup2 (fd1
, fd2
);
869 if (ret
< 0 && errno
== EINTR
)
884 do_exec (gint child_err_report_fd
,
888 const gchar
*working_directory
,
891 gboolean close_descriptors
,
892 gboolean search_path
,
893 gboolean stdout_to_null
,
894 gboolean stderr_to_null
,
895 gboolean child_inherits_stdin
,
896 gboolean file_and_argv_zero
,
897 GSpawnChildSetupFunc child_setup
,
900 if (working_directory
&& chdir (working_directory
) < 0)
901 write_err_and_exit (child_err_report_fd
,
904 /* Close all file descriptors but stdin stdout and stderr as
905 * soon as we exec. Note that this includes
906 * child_err_report_fd, which keeps the parent from blocking
907 * forever on the other end of that pipe.
909 if (close_descriptors
)
914 open_max
= sysconf (_SC_OPEN_MAX
);
915 for (i
= 3; i
< open_max
; i
++)
920 /* We need to do child_err_report_fd anyway */
921 set_cloexec (child_err_report_fd
);
924 /* Redirect pipes as required */
928 /* dup2 can't actually fail here I don't think */
930 if (sane_dup2 (stdin_fd
, 0) < 0)
931 write_err_and_exit (child_err_report_fd
,
934 /* ignore this if it doesn't work */
935 close_and_invalidate (&stdin_fd
);
937 else if (!child_inherits_stdin
)
939 /* Keep process from blocking on a read of stdin */
940 gint read_null
= open ("/dev/null", O_RDONLY
);
941 sane_dup2 (read_null
, 0);
942 close_and_invalidate (&read_null
);
947 /* dup2 can't actually fail here I don't think */
949 if (sane_dup2 (stdout_fd
, 1) < 0)
950 write_err_and_exit (child_err_report_fd
,
953 /* ignore this if it doesn't work */
954 close_and_invalidate (&stdout_fd
);
956 else if (stdout_to_null
)
958 gint write_null
= open ("/dev/null", O_WRONLY
);
959 sane_dup2 (write_null
, 1);
960 close_and_invalidate (&write_null
);
965 /* dup2 can't actually fail here I don't think */
967 if (sane_dup2 (stderr_fd
, 2) < 0)
968 write_err_and_exit (child_err_report_fd
,
971 /* ignore this if it doesn't work */
972 close_and_invalidate (&stderr_fd
);
974 else if (stderr_to_null
)
976 gint write_null
= open ("/dev/null", O_WRONLY
);
977 sane_dup2 (write_null
, 2);
978 close_and_invalidate (&write_null
);
981 /* Call user function just before we exec */
984 (* child_setup
) (user_data
);
988 file_and_argv_zero
? argv
+ 1 : argv
,
992 write_err_and_exit (child_err_report_fd
,
1009 if (bytes
>= sizeof(gint
)*2)
1010 break; /* give up, who knows what happened, should not be
1016 ((gchar
*)buf
) + bytes
,
1017 sizeof(gint
) * n_ints_in_buf
- bytes
);
1018 if (chunk
< 0 && errno
== EINTR
)
1023 /* Some weird shit happened, bail out */
1027 G_SPAWN_ERROR_FAILED
,
1028 _("Failed to read from child pipe (%s)"),
1029 g_strerror (errno
));
1033 else if (chunk
== 0)
1035 else /* chunk > 0 */
1039 *n_ints_read
= (gint
)(bytes
/ sizeof(gint
));
1045 fork_exec_with_pipes (gboolean intermediate_child
,
1046 const gchar
*working_directory
,
1049 gboolean close_descriptors
,
1050 gboolean search_path
,
1051 gboolean stdout_to_null
,
1052 gboolean stderr_to_null
,
1053 gboolean child_inherits_stdin
,
1054 gboolean file_and_argv_zero
,
1055 GSpawnChildSetupFunc child_setup
,
1058 gint
*standard_input
,
1059 gint
*standard_output
,
1060 gint
*standard_error
,
1064 gint stdin_pipe
[2] = { -1, -1 };
1065 gint stdout_pipe
[2] = { -1, -1 };
1066 gint stderr_pipe
[2] = { -1, -1 };
1067 gint child_err_report_pipe
[2] = { -1, -1 };
1068 gint child_pid_report_pipe
[2] = { -1, -1 };
1071 if (!make_pipe (child_err_report_pipe
, error
))
1074 if (intermediate_child
&& !make_pipe (child_pid_report_pipe
, error
))
1075 goto cleanup_and_fail
;
1077 if (standard_input
&& !make_pipe (stdin_pipe
, error
))
1078 goto cleanup_and_fail
;
1080 if (standard_output
&& !make_pipe (stdout_pipe
, error
))
1081 goto cleanup_and_fail
;
1083 if (standard_error
&& !make_pipe (stderr_pipe
, error
))
1084 goto cleanup_and_fail
;
1093 _("Failed to fork (%s)"),
1094 g_strerror (errno
));
1096 goto cleanup_and_fail
;
1100 /* Immediate child. This may or may not be the child that
1101 * actually execs the new process.
1104 /* Be sure we crash if the parent exits
1105 * and we write to the err_report_pipe
1107 signal (SIGPIPE
, SIG_DFL
);
1109 /* Close the parent's end of the pipes;
1110 * not needed in the close_descriptors case,
1113 close_and_invalidate (&child_err_report_pipe
[0]);
1114 close_and_invalidate (&child_pid_report_pipe
[0]);
1115 close_and_invalidate (&stdin_pipe
[1]);
1116 close_and_invalidate (&stdout_pipe
[0]);
1117 close_and_invalidate (&stderr_pipe
[0]);
1119 if (intermediate_child
)
1121 /* We need to fork an intermediate child that launches the
1122 * final child. The purpose of the intermediate child
1123 * is to exit, so we can waitpid() it immediately.
1124 * Then the grandchild will not become a zombie.
1126 GPid grandchild_pid
;
1128 grandchild_pid
= fork ();
1130 if (grandchild_pid
< 0)
1132 /* report -1 as child PID */
1133 write_all (child_pid_report_pipe
[1], &grandchild_pid
,
1134 sizeof(grandchild_pid
));
1136 write_err_and_exit (child_err_report_pipe
[1],
1139 else if (grandchild_pid
== 0)
1141 do_exec (child_err_report_pipe
[1],
1152 child_inherits_stdin
,
1159 write_all (child_pid_report_pipe
[1], &grandchild_pid
, sizeof(grandchild_pid
));
1160 close_and_invalidate (&child_pid_report_pipe
[1]);
1167 /* Just run the child.
1170 do_exec (child_err_report_pipe
[1],
1181 child_inherits_stdin
,
1194 /* Close the uncared-about ends of the pipes */
1195 close_and_invalidate (&child_err_report_pipe
[1]);
1196 close_and_invalidate (&child_pid_report_pipe
[1]);
1197 close_and_invalidate (&stdin_pipe
[0]);
1198 close_and_invalidate (&stdout_pipe
[1]);
1199 close_and_invalidate (&stderr_pipe
[1]);
1201 /* If we had an intermediate child, reap it */
1202 if (intermediate_child
)
1205 if (waitpid (pid
, &status
, 0) < 0)
1209 else if (errno
== ECHILD
)
1210 ; /* do nothing, child already reaped */
1212 g_warning ("waitpid() should not fail in "
1213 "'fork_exec_with_pipes'");
1218 if (!read_ints (child_err_report_pipe
[0],
1221 goto cleanup_and_fail
;
1225 /* Error from the child. */
1229 case CHILD_CHDIR_FAILED
:
1232 G_SPAWN_ERROR_CHDIR
,
1233 _("Failed to change to directory '%s' (%s)"),
1235 g_strerror (buf
[1]));
1239 case CHILD_EXEC_FAILED
:
1242 exec_err_to_g_error (buf
[1]),
1243 _("Failed to execute child process \"%s\" (%s)"),
1245 g_strerror (buf
[1]));
1249 case CHILD_DUP2_FAILED
:
1252 G_SPAWN_ERROR_FAILED
,
1253 _("Failed to redirect output or input of child process (%s)"),
1254 g_strerror (buf
[1]));
1258 case CHILD_FORK_FAILED
:
1262 _("Failed to fork child process (%s)"),
1263 g_strerror (buf
[1]));
1269 G_SPAWN_ERROR_FAILED
,
1270 _("Unknown error executing child process \"%s\""),
1275 goto cleanup_and_fail
;
1278 /* Get child pid from intermediate child pipe. */
1279 if (intermediate_child
)
1283 if (!read_ints (child_pid_report_pipe
[0],
1284 buf
, 1, &n_ints
, error
))
1285 goto cleanup_and_fail
;
1291 G_SPAWN_ERROR_FAILED
,
1292 _("Failed to read enough data from child pid pipe (%s)"),
1293 g_strerror (errno
));
1294 goto cleanup_and_fail
;
1298 /* we have the child pid */
1303 /* Success against all odds! return the information */
1304 close_and_invalidate (&child_err_report_pipe
[0]);
1305 close_and_invalidate (&child_pid_report_pipe
[0]);
1311 *standard_input
= stdin_pipe
[1];
1312 if (standard_output
)
1313 *standard_output
= stdout_pipe
[0];
1315 *standard_error
= stderr_pipe
[0];
1322 /* There was an error from the Child, reap the child to avoid it being
1329 if (waitpid (pid
, NULL
, 0) < 0)
1333 else if (errno
== ECHILD
)
1334 ; /* do nothing, child already reaped */
1336 g_warning ("waitpid() should not fail in "
1337 "'fork_exec_with_pipes'");
1341 close_and_invalidate (&child_err_report_pipe
[0]);
1342 close_and_invalidate (&child_err_report_pipe
[1]);
1343 close_and_invalidate (&child_pid_report_pipe
[0]);
1344 close_and_invalidate (&child_pid_report_pipe
[1]);
1345 close_and_invalidate (&stdin_pipe
[0]);
1346 close_and_invalidate (&stdin_pipe
[1]);
1347 close_and_invalidate (&stdout_pipe
[0]);
1348 close_and_invalidate (&stdout_pipe
[1]);
1349 close_and_invalidate (&stderr_pipe
[0]);
1350 close_and_invalidate (&stderr_pipe
[1]);
1356 make_pipe (gint p
[2],
1363 G_SPAWN_ERROR_FAILED
,
1364 _("Failed to create pipe for communicating with child process (%s)"),
1365 g_strerror (errno
));
1372 /* Based on execvp from GNU C Library */
1375 script_execute (const gchar
*file
,
1378 gboolean search_path
)
1380 /* Count the arguments. */
1385 /* Construct an argument list for the shell. */
1389 new_argv
= g_new0 (gchar
*, argc
+ 2); /* /bin/sh and NULL */
1391 new_argv
[0] = (char *) "/bin/sh";
1392 new_argv
[1] = (char *) file
;
1395 new_argv
[argc
+ 1] = argv
[argc
];
1399 /* Execute the shell. */
1401 execve (new_argv
[0], new_argv
, envp
);
1403 execv (new_argv
[0], new_argv
);
1410 my_strchrnul (const gchar
*str
, gchar c
)
1412 gchar
*p
= (gchar
*) str
;
1413 while (*p
&& (*p
!= c
))
1420 g_execute (const gchar
*file
,
1423 gboolean search_path
)
1427 /* We check the simple case first. */
1432 if (!search_path
|| strchr (file
, '/') != NULL
)
1434 /* Don't search when it contains a slash. */
1436 execve (file
, argv
, envp
);
1440 if (errno
== ENOEXEC
)
1441 script_execute (file
, argv
, envp
, FALSE
);
1445 gboolean got_eacces
= 0;
1446 const gchar
*path
, *p
;
1447 gchar
*name
, *freeme
;
1451 path
= g_getenv ("PATH");
1454 /* There is no `PATH' in the environment. The default
1455 * search path in libc is the current directory followed by
1456 * the path `confstr' returns for `_CS_PATH'.
1459 /* In GLib we put . last, for security, and don't use the
1460 * unportable confstr(); UNIX98 does not actually specify
1461 * what to search if PATH is unset. POSIX may, dunno.
1464 path
= "/bin:/usr/bin:.";
1467 len
= strlen (file
) + 1;
1468 pathlen
= strlen (path
);
1469 freeme
= name
= g_malloc (pathlen
+ len
+ 1);
1471 /* Copy the file name at the top, including '\0' */
1472 memcpy (name
+ pathlen
+ 1, file
, len
);
1473 name
= name
+ pathlen
;
1474 /* And add the slash before the filename */
1483 p
= my_strchrnul (path
, ':');
1486 /* Two adjacent colons, or a colon at the beginning or the end
1487 * of `PATH' means to search the current directory.
1491 startp
= memcpy (name
- (p
- path
), path
, p
- path
);
1493 /* Try to execute this name. If it works, execv will not return. */
1495 execve (startp
, argv
, envp
);
1497 execv (startp
, argv
);
1499 if (errno
== ENOEXEC
)
1500 script_execute (startp
, argv
, envp
, search_path
);
1505 /* Record the we got a `Permission denied' error. If we end
1506 * up finding no executable we can use, we want to diagnose
1507 * that we did find one but were denied access.
1520 /* Those errors indicate the file is missing or not executable
1521 * by us, in which case we want to just try the next path
1527 /* Some other error means we found an executable file, but
1528 * something went wrong executing it; return the error to our
1535 while (*p
++ != '\0');
1537 /* We tried every element and none of them worked. */
1539 /* At least one failure was due to permissions, so report that
1547 /* Return the error from the last attempt (probably ENOENT). */
1552 * g_spawn_close_pid:
1553 * @pid: The process identifier to close
1555 * On some platforms, notably WIN32, the #GPid type represents a resource
1556 * which must be closed to prevent resource leaking. g_spawn_close_pid()
1557 * is provided for this purpose. It should be used on all platforms, even
1558 * though it doesn't do anything under UNIX.
1561 g_spawn_close_pid (GPid pid
)
1565 #define __G_SPAWN_C__
1566 #include "galiasdef.c"