2013-10-01 Petr Hosek <phosek@chromium.org>

        * configure.host: Disable new posix_spawn function for all
        users of posix dir except Cygwin.
        * libc/posix/Makefile.am: Add support for new posix_spawn function.
        * libc/posix/Makefile.in: Regenerate.
        * libc/posix/posix_spawn.c: New file.
        * libc/include/spawn.h: Ditto.

1 files changed, 579 insertions, 0 deletions

diff --git a/newlib/libc/posix/posix_spawn.c b/newlib/libc/posix/posix_spawn.c
new file mode 100644
index 000000000..14d5b8090
--- /dev/null
+++ b/newlib/libc/posix/posix_spawn.c
@@ -0,0 +1,579 @@
+/*-
+ * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+FUNCTION
+<<posix_spawn>>, <<posix_spawnp>>---spawn a process
+
+INDEX
+	posix_spawn
+INDEX
+	posix_spawnp
+
+ANSI_SYNOPSIS
+	#include <spawn.h>
+
+	int posix_spawn(pid_t *<[pid]>, const char *<[path]>,
+			const posix_spawn_file_actions_t *<[file_actions]>,
+			const posix_spawnattr_t *<[attrp]>,
+			char *const <[argv]>, char *const <[envp]>);
+	int posix_spawnp(pid_t *<[pid]>, const char *<[file]>,
+			const posix_spawn_file_actions_t *<[file_actions]>,
+			const posix_spawnattr_t *<[attrp]>,
+			char *const <[argv]>, char *const <[envp]>);
+
+DESCRIPTION
+Use <<posix_spawn>> and <<posix_spawnp>> to create a new child process
+from the specified process image file. <<argc>> is the argument count
+and <<argv>> is an array of argument strings passed to the new program.
+<<envp>> is an array of stings, which are passed as environment to the
+new program.
+
+The <<path>> argument to <<posix_spawn>> identifies the new process
+image file to execute. The <<file>> argument to <<posix_spawnp>> is
+used to construct a pathname that identifies the new process image
+file by duplicating the actions of the shell in searching for an
+executable file if the specified filename does not contain a `<</>>'
+character. The <<file>> is sought in the colon-separated list of
+directory pathnames specified in the <<PATH>> environment variable.
+
+The file descriptors remain open across <<posix_spawn>> and
+<<posix_spawnp>> except for those marked as close-on-exec. The open
+file descriptors in the child process can be modified by the spawn file
+actions object pointed to by <<file_actions>>.
+
+The spawn attributes object type pointed to by <<attrp>> argument
+may contain any of the attributes defined in <<spawn.h>>.
+
+RETURNS
+<<posix_spawn>> and <<posix_spawnp>> return the process ID of the newly
+spawned child process in the variable pointed by a non-NULL <<*<[pid]>>>
+argument and zero as the function return value upon successful
+completion. Otherwise, <<posix_spawn>> and <<posix_spawnp>> return an
+error number as the function return value to indicate the error; the
+value stored into the variable pointed to by a non-NULL <<*<[pid]>>>
+argument is unspecified.
+
+PORTABILITY
+POSIX.1-2008 requires <<posix_spawn>> and <<posix_spawnp>>.
+
+Supporting OS subroutines required: <<_close>>, <<_dup2>>, <<_fcntl>>,
+<<_execve>>, <<_execvpe>>, <<_exit>>, <<_open>>, <<_sigaction>>,
+<<_sigprocmask>>, <<_waitpid>>, <<sched_setscheduler>>,
+<<sched_setparam>>, <<setegid>>, <<seteuid>>, <<setpgid>>, <<vfork>>.
+*/
+
+#ifndef _NO_POSIX_SPAWN
+
+#include <sys/cdefs.h>
+
+#include "namespace.h"
+#include <sys/signal.h>
+#include <sys/queue.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <spawn.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "un-namespace.h"
+
+/* Only deal with a pointer to environ, to work around subtle bugs with shared
+   libraries and/or small data systems where the user declares his own
+   'environ'.  */
+static char ***p_environ = &environ;
+
+struct __posix_spawnattr {
+	short			sa_flags;
+	pid_t			sa_pgroup;
+	struct sched_param	sa_schedparam;
+	int			sa_schedpolicy;
+	sigset_t		sa_sigdefault;
+	sigset_t		sa_sigmask;
+};
+
+struct __posix_spawn_file_actions {
+	STAILQ_HEAD(, __posix_spawn_file_actions_entry) fa_list;
+};
+
+typedef struct __posix_spawn_file_actions_entry {
+	STAILQ_ENTRY(__posix_spawn_file_actions_entry) fae_list;
+	enum { FAE_OPEN, FAE_DUP2, FAE_CLOSE } fae_action;
+
+	int fae_fildes;
+	union {
+		struct {
+			char *path;
+#define fae_path	fae_data.open.path
+			int oflag;
+#define fae_oflag	fae_data.open.oflag
+			mode_t mode;
+#define fae_mode	fae_data.open.mode
+		} open;
+		struct {
+			int newfildes;
+#define fae_newfildes	fae_data.dup2.newfildes
+		} dup2;
+	} fae_data;
+} posix_spawn_file_actions_entry_t;
+
+/*
+ * Spawn routines
+ */
+
+static int
+process_spawnattr(_CONST posix_spawnattr_t sa)
+{
+	struct sigaction sigact = { .sa_flags = 0, .sa_handler = SIG_DFL };
+	int i;
+
+	/*
+	 * POSIX doesn't really describe in which order everything
+	 * should be set. We'll just set them in the order in which they
+	 * are mentioned.
+	 */
+
+	/* Set process group */
+	if (sa->sa_flags & POSIX_SPAWN_SETPGROUP) {
+		if (setpgid(0, sa->sa_pgroup) != 0)
+			return (errno);
+	}
+
+	/* Set scheduler policy */
+	if (sa->sa_flags & POSIX_SPAWN_SETSCHEDULER) {
+		if (sched_setscheduler(0, sa->sa_schedpolicy,
+		    &sa->sa_schedparam) != 0)
+			return (errno);
+	} else if (sa->sa_flags & POSIX_SPAWN_SETSCHEDPARAM) {
+		if (sched_setparam(0, &sa->sa_schedparam) != 0)
+			return (errno);
+	}
+
+	/* Reset user ID's */
+	if (sa->sa_flags & POSIX_SPAWN_RESETIDS) {
+		if (setegid(getgid()) != 0)
+			return (errno);
+		if (seteuid(getuid()) != 0)
+			return (errno);
+	}
+
+	/* Set signal masks/defaults */
+	if (sa->sa_flags & POSIX_SPAWN_SETSIGMASK) {
+		_sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL);
+	}
+
+	if (sa->sa_flags & POSIX_SPAWN_SETSIGDEF) {
+		for (i = 1; i < NSIG; i++) {
+			if (sigismember(&sa->sa_sigdefault, i))
+				if (_sigaction(i, &sigact, NULL) != 0)
+					return (errno);
+		}
+	}
+
+	return (0);
+}
+
+static int
+process_file_actions_entry(posix_spawn_file_actions_entry_t *fae)
+{
+	int fd;
+
+	switch (fae->fae_action) {
+	case FAE_OPEN:
+		/* Perform an open(), make it use the right fd */
+		fd = _open(fae->fae_path, fae->fae_oflag, fae->fae_mode);
+		if (fd < 0)
+			return (errno);
+		if (fd != fae->fae_fildes) {
+			if (_dup2(fd, fae->fae_fildes) == -1)
+				return (errno);
+			if (_close(fd) != 0) {
+				if (errno == EBADF)
+					return (EBADF);
+			}
+		}
+#ifdef HAVE_FCNTL
+		if (_fcntl(fae->fae_fildes, F_SETFD, 0) == -1)
+			return (errno);
+#endif /* HAVE_FCNTL */
+		break;
+	case FAE_DUP2:
+		/* Perform a dup2() */
+		if (_dup2(fae->fae_fildes, fae->fae_newfildes) == -1)
+			return (errno);
+#ifdef HAVE_FCNTL
+		if (_fcntl(fae->fae_newfildes, F_SETFD, 0) == -1)
+			return (errno);
+#endif /* HAVE_FCNTL */
+		break;
+	case FAE_CLOSE:
+		/* Perform a close(), do not fail if already closed */
+		(void)_close(fae->fae_fildes);
+		break;
+	}
+	return (0);
+}
+
+static int
+process_file_actions(_CONST posix_spawn_file_actions_t fa)
+{
+	posix_spawn_file_actions_entry_t *fae;
+	int error;
+
+	/* Replay all file descriptor modifications */
+	STAILQ_FOREACH(fae, &fa->fa_list, fae_list) {
+		error = process_file_actions_entry(fae);
+		if (error)
+			return (error);
+	}
+	return (0);
+}
+
+static int
+do_posix_spawn(pid_t *pid, _CONST char *path,
+	_CONST posix_spawn_file_actions_t *fa,
+	_CONST posix_spawnattr_t *sa,
+	char * _CONST argv[], char * _CONST envp[], int use_env_path)
+{
+	pid_t p;
+	volatile int error = 0;
+
+	p = vfork();
+	switch (p) {
+	case -1:
+		return (errno);
+	case 0:
+		if (sa != NULL) {
+			error = process_spawnattr(*sa);
+			if (error)
+				_exit(127);
+		}
+		if (fa != NULL) {
+			error = process_file_actions(*fa);
+			if (error)
+				_exit(127);
+		}
+		if (use_env_path)
+			_execvpe(path, argv, envp != NULL ? envp : *p_environ);
+		else
+			_execve(path, argv, envp != NULL ? envp : *p_environ);
+		error = errno;
+		_exit(127);
+	default:
+		if (error != 0)
+			_waitpid(p, NULL, WNOHANG);
+		else if (pid != NULL)
+			*pid = p;
+		return (error);
+	}
+}
+
+int
+_DEFUN(posix_spawn, (pid, path, fa, sa, argv, envp),
+	pid_t *pid _AND
+	_CONST char *path _AND
+	_CONST posix_spawn_file_actions_t *fa _AND
+	_CONST posix_spawnattr_t *sa _AND
+	char * _CONST argv[] _AND
+	char * _CONST envp[])
+{
+	return do_posix_spawn(pid, path, fa, sa, argv, envp, 0);
+}
+
+int
+_DEFUN(posix_spawnp, (pid, path, fa, sa, argv, envp),
+	pid_t *pid _AND
+	_CONST char *path _AND
+	_CONST posix_spawn_file_actions_t *fa _AND
+	_CONST posix_spawnattr_t *sa _AND
+	char * _CONST argv[] _AND
+	char * _CONST envp[])
+{
+	return do_posix_spawn(pid, path, fa, sa, argv, envp, 1);
+}
+
+/*
+ * File descriptor actions
+ */
+
+int
+_DEFUN(posix_spawn_file_actions_init, (ret),
+	posix_spawn_file_actions_t *ret)
+{
+	posix_spawn_file_actions_t fa;
+
+	fa = malloc(sizeof(struct __posix_spawn_file_actions));
+	if (fa == NULL)
+		return (-1);
+
+	STAILQ_INIT(&fa->fa_list);
+	*ret = fa;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawn_file_action_destroy, (fa),
+	posix_spawn_file_actions_t *fa)
+{
+	posix_spawn_file_actions_entry_t *fae;
+
+	while ((fae = STAILQ_FIRST(&(*fa)->fa_list)) != NULL) {
+		/* Remove file action entry from the queue */
+		STAILQ_REMOVE_HEAD(&(*fa)->fa_list, fae_list);
+
+		/* Deallocate file action entry */
+		if (fae->fae_action == FAE_OPEN)
+			free(fae->fae_path);
+		free(fae);
+	}
+
+	free(*fa);
+	return (0);
+}
+
+int
+_DEFUN(posix_spawn_file_actions_addopen, (fa, fildes, path, oflag, mode),
+	posix_spawn_file_actions_t * __restrict fa _AND
+	int fildes _AND
+	_CONST char * __restrict path _AND
+	int oflag _AND
+	mode_t mode)
+{
+	posix_spawn_file_actions_entry_t *fae;
+	int error;
+
+	if (fildes < 0)
+		return (EBADF);
+
+	/* Allocate object */
+	fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
+	if (fae == NULL)
+		return (errno);
+
+	/* Set values and store in queue */
+	fae->fae_action = FAE_OPEN;
+	fae->fae_path = strdup(path);
+	if (fae->fae_path == NULL) {
+		error = errno;
+		free(fae);
+		return (error);
+	}
+	fae->fae_fildes = fildes;
+	fae->fae_oflag = oflag;
+	fae->fae_mode = mode;
+
+	STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
+	return (0);
+}
+
+int
+_DEFUN(posix_spawn_file_actions_adddup2, (fa, fildes, newfildes),
+	posix_spawn_file_actions_t *fa _AND
+	int fildes _AND
+	int newfildes)
+{
+	posix_spawn_file_actions_entry_t *fae;
+
+	if (fildes < 0 || newfildes < 0)
+		return (EBADF);
+
+	/* Allocate object */
+	fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
+	if (fae == NULL)
+		return (errno);
+
+	/* Set values and store in queue */
+	fae->fae_action = FAE_DUP2;
+	fae->fae_fildes = fildes;
+	fae->fae_newfildes = newfildes;
+
+	STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
+	return (0);
+}
+
+int
+_DEFUN(posix_spawn_file_actions_addclose, (fa, fildes),
+	posix_spawn_file_actions_t *fa _AND
+	int fildes)
+{
+	posix_spawn_file_actions_entry_t *fae;
+
+	if (fildes < 0)
+		return (EBADF);
+
+	/* Allocate object */
+	fae = malloc(sizeof(posix_spawn_file_actions_entry_t));
+	if (fae == NULL)
+		return (errno);
+
+	/* Set values and store in queue */
+	fae->fae_action = FAE_CLOSE;
+	fae->fae_fildes = fildes;
+
+	STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list);
+	return (0);
+}
+
+/*
+ * Spawn attributes
+ */
+
+int
+_DEFUN(posix_spawnattr_init, (ret),
+	posix_spawnattr_t *ret)
+{
+	posix_spawnattr_t sa;
+
+	sa = calloc(1, sizeof(struct __posix_spawnattr));
+	if (sa == NULL)
+		return (errno);
+
+	/* Set defaults as specified by POSIX, cleared above */
+	*ret = sa;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_destroy, (sa),
+	posix_spawnattr_t *sa)
+{
+	free(*sa);
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_getflags, (sa, flags),
+	_CONST posix_spawnattr_t * __restrict sa _AND
+	short * __restrict flags)
+{
+	*flags = (*sa)->sa_flags;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_getpgroup, (sa, pgroup),
+	_CONST posix_spawnattr_t * __restrict sa _AND
+	pid_t * __restrict pgroup)
+{
+	*pgroup = (*sa)->sa_pgroup;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_getschedparam, (sa, schedparam),
+	_CONST posix_spawnattr_t * __restrict sa _AND
+	struct sched_param * __restrict schedparam)
+{
+	*schedparam = (*sa)->sa_schedparam;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_getschedpolicy, (sa, schedpolicy),
+	_CONST posix_spawnattr_t * __restrict sa _AND
+	int * __restrict schedpolicy)
+{
+	*schedpolicy = (*sa)->sa_schedpolicy;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_getsigdefault, (sa, sigdefault),
+	_CONST posix_spawnattr_t * __restrict sa _AND
+	sigset_t * __restrict sigdefault)
+{
+	*sigdefault = (*sa)->sa_sigdefault;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_getsigmask, (sa, sigmask),
+	_CONST posix_spawnattr_t * __restrict sa _AND
+	sigset_t * __restrict sigmask)
+{
+	*sigmask = (*sa)->sa_sigmask;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_setflags, (sa, flags),
+	posix_spawnattr_t *sa _AND
+	short flags)
+{
+	(*sa)->sa_flags = flags;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_setpgroup, (sa, pgroup),
+	posix_spawnattr_t *sa _AND
+	pid_t pgroup)
+{
+	(*sa)->sa_pgroup = pgroup;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_setschedparam, (sa, schedparam),
+	posix_spawnattr_t * __restrict sa _AND
+	_CONST struct sched_param * __restrict schedparam)
+{
+	(*sa)->sa_schedparam = *schedparam;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_setschedpolicy, (sa, schedpolicy),
+	posix_spawnattr_t *sa _AND
+	int schedpolicy)
+{
+	(*sa)->sa_schedpolicy = schedpolicy;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_setsigdefault, (sa, sigdefault),
+	posix_spawnattr_t * __restrict sa _AND
+	_CONST sigset_t * __restrict sigdefault)
+{
+	(*sa)->sa_sigdefault = *sigdefault;
+	return (0);
+}
+
+int
+_DEFUN(posix_spawnattr_setsigmask, (sa, sigmask),
+	posix_spawnattr_t * __restrict sa _AND
+	_CONST sigset_t * __restrict sigmask)
+{
+	(*sa)->sa_sigmask = *sigmask;
+	return (0);
+}
+
+#endif  /* !_NO_POSIX_SPAWN */