Mercurial > gnulib
view lib/spawn_faction_adddup2.c @ 39828:8d755c31408d
posix_spawn_file_actions_addchdir: New module.
Suggested by Eric Blake in
<https://lists.gnu.org/archive/html/bug-findutils/2018-09/msg00007.html>.
* lib/spawn.in.h (posix_spawn_file_actions_addchdir): New declaration.
* lib/spawn_int.h (struct __spawn_action): Add tag 'spawn_do_chdir' and
union member 'chdir_action'.
* lib/spawn_faction_addchdir.c: New file.
* lib/spawni.c (__spawni): Implement the spawn_do_chdir action.
* lib/spawn_faction_addclose.c: Test REPLACE_POSIX_SPAWN instead of
HAVE_WORKING_POSIX_SPAWN.
* lib/spawn_faction_adddup2.c: Likewise.
* lib/spawn_faction_addopen.c: Likewise.
* m4/posix_spawn_faction_addchdir.m4: New file.
* m4/posix_spawn.m4 (gl_POSIX_SPAWN_BODY): Test whether module
'posix_spawn_file_actions_addchdir' is present and whether
posix_spawn_file_actions_addchdir_np exists. Define REPLACE_POSIX_SPAWN
instead of HAVE_WORKING_POSIX_SPAWN.
* m4/spawn_h.m4 (gl_SPAWN_H): Test whether
posix_spawn_file_actions_addchdir is declared.
(gl_SPAWN_H_DEFAULTS): Initialize
GNULIB_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR,
HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR,
REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR.
* modules/spawn (Makefile.am): Substitute
GNULIB_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR,
HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR,
REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR.
* modules/posix_spawn_file_actions_addchdir: New file.
* modules/posix_spawn_file_actions_addclose (Depends-on,
configure.ac): Test also REPLACE_POSIX_SPAWN.
* modules/posix_spawn_file_actions_adddup2 (Depends-on,
configure.ac): Likewise.
* modules/posix_spawn_file_actions_addopen (Depends-on,
configure.ac): Likewise.
* tests/test-spawn-c++.cc (posix_spawn_file_actions_addchdir): Check
signature.
* doc/posix-functions/posix_spawn.texi: Mention the new module.
* doc/posix-functions/posix_spawnp.texi: Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 07 Sep 2018 23:35:52 +0200 |
parents | 10eb9086bea0 |
children | b06060465f09 |
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/* Copyright (C) 2000, 2009-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. 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 3 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 <https://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include <spawn.h> #include <errno.h> #include <unistd.h> #if !_LIBC # define __sysconf(open_max) getdtablesize () #endif #if REPLACE_POSIX_SPAWN # include "spawn_int.h" #endif /* Add an action to FILE-ACTIONS which tells the implementation to call 'dup2' for the given file descriptors during the 'spawn' call. */ int posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions, int fd, int newfd) #undef posix_spawn_file_actions_adddup2 { int maxfd = __sysconf (_SC_OPEN_MAX); /* Test for the validity of the file descriptor. */ if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd) return EBADF; #if !REPLACE_POSIX_SPAWN return posix_spawn_file_actions_adddup2 (file_actions, fd, newfd); #else /* Allocate more memory if needed. */ if (file_actions->_used == file_actions->_allocated && __posix_spawn_file_actions_realloc (file_actions) != 0) /* This can only mean we ran out of memory. */ return ENOMEM; { struct __spawn_action *rec; /* Add the new value. */ rec = &file_actions->_actions[file_actions->_used]; rec->tag = spawn_do_dup2; rec->action.dup2_action.fd = fd; rec->action.dup2_action.newfd = newfd; /* Account for the new entry. */ ++file_actions->_used; return 0; } #endif }