exechelp-posix.c
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exechelp-posix.c
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	/* exechelp.c - Fork and exec helpers for POSIX
	* Copyright (C) 2004, 2007-2009, 2010 Free Software Foundation, Inc.
	* Copyright (C) 2004, 2006-2012, 2014-2017 g10 Code GmbH
	*
	* This file is part of GnuPG.
	*
	* This file is free software; you can redistribute it and/or modify
	* it under the terms of either
	*
	* - the GNU Lesser General Public License as published by the Free
	* Software Foundation; either version 3 of the License, or (at
	* your option) any later version.
	*
	* or
	*
	* - the GNU General Public License as published by the Free
	* Software Foundation; either version 2 of the License, or (at
	* your option) any later version.
	*
	* or both in parallel, as here.
	*
	* This file 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/>.
	* SPDX-License-Identifier: (LGPL-3.0+ OR GPL-2.0+)
	*/

	#include <config.h>

	#if defined(HAVE_W32_SYSTEM)
	#error This code is only used on POSIX
	#endif

	#include <stdio.h>
	#include <stdlib.h>
	#include <stdint.h>
	#include <string.h>
	#include <errno.h>
	#include <assert.h>
	#ifdef HAVE_SIGNAL_H
	# include <signal.h>
	#endif
	#include <unistd.h>
	#include <fcntl.h>

	#ifdef WITHOUT_NPTH /* Give the Makefile a chance to build without Pth. */
	#undef HAVE_NPTH
	#undef USE_NPTH
	#endif

	#ifdef HAVE_NPTH
	#include <npth.h>
	#endif
	#include <sys/wait.h>

	#ifdef HAVE_GETRLIMIT
	#include <sys/time.h>
	#include <sys/resource.h>
	#endif /HAVE_GETRLIMIT/

	#ifdef HAVE_STAT
	# include <sys/stat.h>
	#endif

	#if __linux__
	# include <sys/types.h>
	# include <dirent.h>
	#endif /__linux__ /

	#include "util.h"
	#include "i18n.h"
	#include "sysutils.h"
	#include "exechelp.h"


	/* Helper */
	static inline gpg_error_t
	my_error_from_syserror (void)
	{
	return gpg_err_make (default_errsource, gpg_err_code_from_syserror ());
	}

	static inline gpg_error_t
	my_error (int errcode)
	{
	return gpg_err_make (default_errsource, errcode);
	}


	/* Return the maximum number of currently allowed open file
	descriptors. Only useful on POSIX systems but returns a value on
	other systems too. */
	int
	get_max_fds (void)
	{
	int max_fds = -1;
	#ifdef HAVE_GETRLIMIT
	struct rlimit rl;

	/* Under Linux we can figure out the highest used file descriptor by
	* reading /proc/PID/fd. This is in the common cases much fast than
	* for example doing 4096 close calls where almost all of them will
	* fail. On a system with a limit of 4096 files and only 8 files
	* open with the highest number being 10, we speedup close_all_fds
	* from 125ms to 0.4ms including readdir.
	*
	* Another option would be to close the file descriptors as returned
	* from reading that directory - however then we need to snapshot
	* that list before starting to close them. */
	#ifdef __linux__
	{
	DIR *dir = NULL;
	struct dirent *dir_entry;
	const char *s;
	int x;

	dir = opendir ("/proc/self/fd");
	if (dir)
	{
	while ((dir_entry = readdir (dir)))
	{
	s = dir_entry->d_name;
	if ( s < '0' \|\| s > '9')
	continue;
	x = atoi (s);
	if (x > max_fds)
	max_fds = x;
	}
	closedir (dir);
	}
	if (max_fds != -1)
	return max_fds + 1;
	}
	#endif /* __linux__ */


	# ifdef RLIMIT_NOFILE
	if (!getrlimit (RLIMIT_NOFILE, &rl))
	max_fds = rl.rlim_max;
	# endif

	# ifdef RLIMIT_OFILE
	if (max_fds == -1 && !getrlimit (RLIMIT_OFILE, &rl))
	max_fds = rl.rlim_max;

	# endif
	#endif /HAVE_GETRLIMIT/

	#ifdef _SC_OPEN_MAX
	if (max_fds == -1)
	{
	long int scres = sysconf (_SC_OPEN_MAX);
	if (scres >= 0)
	max_fds = scres;
	}
	#endif

	#ifdef _POSIX_OPEN_MAX
	if (max_fds == -1)
	max_fds = _POSIX_OPEN_MAX;
	#endif

	#ifdef OPEN_MAX
	if (max_fds == -1)
	max_fds = OPEN_MAX;
	#endif

	if (max_fds == -1)
	max_fds = 256; /* Arbitrary limit. */

	/* AIX returns INT32_MAX instead of a proper value. We assume that
	this is always an error and use an arbitrary limit. */
	#ifdef INT32_MAX
	if (max_fds == INT32_MAX)
	max_fds = 256;
	#endif

	return max_fds;
	}


	/* Close all file descriptors starting with descriptor FIRST. If
	EXCEPT is not NULL, it is expected to be a list of file descriptors
	which shall not be closed. This list shall be sorted in ascending
	order with the end marked by -1. */
	void
	close_all_fds (int first, int *except)
	{
	int max_fd = get_max_fds ();
	int fd, i, except_start;

	if (except)
	{
	except_start = 0;
	for (fd=first; fd < max_fd; fd++)
	{
	for (i=except_start; except[i] != -1; i++)
	{
	if (except[i] == fd)
	{
	/* If we found the descriptor in the exception list
	we can start the next compare run at the next
	index because the exception list is ordered. */
	except_start = i + 1;
	break;
	}
	}
	if (except[i] == -1)
	close (fd);
	}
	}
	else
	{
	for (fd=first; fd < max_fd; fd++)
	close (fd);
	}

	gpg_err_set_errno (0);
	}


	/* Returns an array with all currently open file descriptors. The end
	of the array is marked by -1. The caller needs to release this
	array using the standard free and not with xfree. This allow the
	use of this function right at startup even before libgcrypt has
	been initialized. Returns NULL on error and sets ERRNO
	accordingly. */
	int *
	get_all_open_fds (void)
	{
	int *array;
	size_t narray;
	int fd, max_fd, idx;
	#ifndef HAVE_STAT
	array = calloc (1, sizeof *array);
	if (array)
	array[0] = -1;
	#else /HAVE_STAT/
	struct stat statbuf;

	max_fd = get_max_fds ();
	narray = 32; /* If you change this change also t-exechelp.c. */
	array = calloc (narray, sizeof *array);
	if (!array)
	return NULL;

	/* Note: The list we return is ordered. */
	for (idx=0, fd=0; fd < max_fd; fd++)
	if (!(fstat (fd, &statbuf) == -1 && errno == EBADF))
	{
	if (idx+1 >= narray)
	{
	int *tmp;

	narray += (narray < 256)? 32:256;
	tmp = realloc (array, narray * sizeof *array);
	if (!tmp)
	{
	free (array);
	return NULL;
	}
	array = tmp;
	}
	array[idx++] = fd;
	}
	array[idx] = -1;
	#endif /HAVE_STAT/
	return array;
	}


	static gpg_error_t
	do_create_pipe (int filedes[2])
	{
	gpg_error_t err = 0;

	if (pipe (filedes) == -1)
	{
	err = my_error_from_syserror ();
	filedes[0] = filedes[1] = -1;
	}

	return err;
	}


	static gpg_error_t
	create_pipe_and_estream (int filedes[2], estream_t *r_fp,
	int outbound, int nonblock)
	{
	gpg_error_t err;

	if (pipe (filedes) == -1)
	{
	err = my_error_from_syserror ();
	log_error (_("error creating a pipe: %s\n"), gpg_strerror (err));
	filedes[0] = filedes[1] = -1;
	*r_fp = NULL;
	return err;
	}

	if (!outbound)
	*r_fp = es_fdopen (filedes[0], nonblock? "r,nonblock" : "r");
	else
	*r_fp = es_fdopen (filedes[1], nonblock? "w,nonblock" : "w");
	if (!*r_fp)
	{
	err = my_error_from_syserror ();
	log_error (_("error creating a stream for a pipe: %s\n"),
	gpg_strerror (err));
	close (filedes[0]);
	close (filedes[1]);
	filedes[0] = filedes[1] = -1;
	return err;
	}
	return 0;
	}


	/* Portable function to create a pipe. Under Windows the write end is
	inheritable. If R_FP is not NULL, an estream is created for the
	read end and stored at R_FP. */
	gpg_error_t
	gnupg_create_inbound_pipe (int filedes[2], estream_t *r_fp, int nonblock)
	{
	if (r_fp)
	return create_pipe_and_estream (filedes, r_fp, 0, nonblock);
	else
	return do_create_pipe (filedes);
	}


	/* Portable function to create a pipe. Under Windows the read end is
	inheritable. If R_FP is not NULL, an estream is created for the
	write end and stored at R_FP. */
	gpg_error_t
	gnupg_create_outbound_pipe (int filedes[2], estream_t *r_fp, int nonblock)
	{
	if (r_fp)
	return create_pipe_and_estream (filedes, r_fp, 1, nonblock);
	else
	return do_create_pipe (filedes);
	}


	/* Portable function to create a pipe. Under Windows both ends are
	inheritable. */
	gpg_error_t
	gnupg_create_pipe (int filedes[2])
	{
	return do_create_pipe (filedes);
	}


	/* Close the end of a pipe. */
	void
	gnupg_close_pipe (int fd)
	{
	if (fd != -1)
	close (fd);
	}

	#include <sys/socket.h>

	struct gnupg_process {
	const char *pgmname;
	unsigned int terminated :1; /* or detached */
	unsigned int flags;
	pid_t pid;
	int fd_in;
	int fd_out;
	int fd_err;
	int wstatus;
	};

	static int gnupg_process_syscall_func_initialized;

	/* Functions called before and after blocking syscalls. */
	static void (*pre_syscall_func) (void);
	static void (*post_syscall_func) (void);

	static void
	check_syscall_func (void)
	{
	if (!gnupg_process_syscall_func_initialized)
	{
	gpgrt_get_syscall_clamp (&pre_syscall_func, &post_syscall_func);
	gnupg_process_syscall_func_initialized = 1;
	}
	}

	static void
	pre_syscall (void)
	{
	if (pre_syscall_func)
	pre_syscall_func ();
	}

	static void
	post_syscall (void)
	{
	if (post_syscall_func)
	post_syscall_func ();
	}


	static gpg_err_code_t
	do_create_socketpair (int filedes[2])
	{
	gpg_error_t err = 0;

	pre_syscall ();
	if (socketpair (AF_LOCAL, SOCK_STREAM, 0, filedes) == -1)
	{
	err = gpg_err_code_from_syserror ();
	filedes[0] = filedes[1] = -1;
	}
	post_syscall ();

	return err;
	}

	static int
	posix_open_null (int for_write)
	{
	int fd;

	fd = open ("/dev/null", for_write? O_WRONLY : O_RDONLY);
	if (fd == -1)
	log_fatal ("failed to open '/dev/null': %s\n", strerror (errno));
	return fd;
	}

	static void
	call_spawn_cb (struct spawn_cb_arg *sca,
	int fd_in, int fd_out, int fd_err,
	void (spawn_cb) (struct spawn_cb_arg ), void *spawn_cb_arg)
	{
	sca->fds[0] = fd_in;
	sca->fds[1] = fd_out;
	sca->fds[2] = fd_err;
	sca->except_fds = NULL;
	sca->arg = spawn_cb_arg;
	if (spawn_cb)
	(*spawn_cb) (sca);
	}

	static void
	my_exec (const char pgmname, const char argv[], struct spawn_cb_arg *sca)
	{
	int i;

	/* Assign /dev/null to unused FDs. */
	for (i = 0; i <= 2; i++)
	if (sca->fds[i] == -1)
	sca->fds[i] = posix_open_null (i);

	/* Connect the standard files. */
	for (i = 0; i <= 2; i++)
	if (sca->fds[i] != i)
	{
	if (dup2 (sca->fds[i], i) == -1)
	log_fatal ("dup2 std%s failed: %s\n",
	i==0?"in":i==1?"out":"err", strerror (errno));
	/*
	* We don't close sca.fds[i] here, but close them by
	* close_all_fds. Note that there may be same one in three of
	* sca->fds[i].
	*/
	}

	/* Close all other files. */
	close_all_fds (3, sca->except_fds);

	execv (pgmname, (char const )argv);
	/* No way to print anything, as we have may have closed all streams. */
	_exit (127);
	}

	static gpg_err_code_t
	spawn_detached (const char pgmname, const char argv[],
	void (spawn_cb) (struct spawn_cb_arg ), void *spawn_cb_arg)
	{
	gpg_err_code_t ec;
	pid_t pid;

	/* FIXME: Is this GnuPG specific or should we keep it. */
	if (getuid() != geteuid())
	{
	xfree (argv);
	return GPG_ERR_BUG;
	}

	if (access (pgmname, X_OK))
	{
	ec = gpg_err_code_from_syserror ();
	xfree (argv);
	return ec;
	}

	pre_syscall ();
	pid = fork ();
	post_syscall ();
	if (pid == (pid_t)(-1))
	{
	ec = gpg_err_code_from_syserror ();
	log_error (_("error forking process: %s\n"), gpg_strerror (ec));
	xfree (argv);
	return ec;
	}

	if (!pid)
	{
	pid_t pid2;
	struct spawn_cb_arg sca;

	if (setsid() == -1 \|\| chdir ("/"))
	_exit (1);

	pid2 = fork (); /* Double fork to let init take over the new child. */
	if (pid2 == (pid_t)(-1))
	_exit (1);
	if (pid2)
	_exit (0); /* Let the parent exit immediately. */

	call_spawn_cb (&sca, -1, -1, -1, spawn_cb, spawn_cb_arg);

	my_exec (pgmname, argv, &sca);
	/NOTREACHED/
	}

	pre_syscall ();
	if (waitpid (pid, NULL, 0) == -1)
	{
	post_syscall ();
	ec = gpg_err_code_from_syserror ();
	log_error ("waitpid failed in gpgrt_spawn_process_detached: %s",
	gpg_strerror (ec));
	return ec;
	}
	else
	post_syscall ();

	return 0;
	}

	void
	gnupg_spawn_helper (struct spawn_cb_arg *sca)
	{
	int *user_except = sca->arg;
	sca->except_fds = user_except;
	}

	gpg_err_code_t
	gnupg_process_spawn (const char pgmname, const char argv1[],
	unsigned int flags,
	void (spawn_cb) (struct spawn_cb_arg ),
	void *spawn_cb_arg,
	gnupg_process_t *r_process)
	{
	gpg_err_code_t ec;
	gnupg_process_t process;
	int fd_in[2];
	int fd_out[2];
	int fd_err[2];
	pid_t pid;
	const char **argv;
	int i, j;

	check_syscall_func ();

	if (r_process)
	*r_process = NULL;

	/* Create the command line argument array. */
	i = 0;
	if (argv1)
	while (argv1[i])
	i++;
	argv = xtrycalloc (i+2, sizeof *argv);
	if (!argv)
	return gpg_err_code_from_syserror ();
	argv[0] = strrchr (pgmname, '/');
	if (argv[0])
	argv[0]++;
	else
	argv[0] = pgmname;

	if (argv1)
	for (i=0, j=1; argv1[i]; i++, j++)
	argv[j] = argv1[i];

	if ((flags & GNUPG_PROCESS_DETACHED))
	{
	if ((flags & GNUPG_PROCESS_STDFDS_SETTING))
	{
	xfree (argv);
	return GPG_ERR_INV_FLAG;
	}

	/* In detached case, it must be no R_PROCESS. */
	if (r_process)
	{
	xfree (argv);
	return GPG_ERR_INV_ARG;
	}

	return spawn_detached (pgmname, argv, spawn_cb, spawn_cb_arg);
	}

	process = xtrycalloc (1, sizeof (struct gnupg_process));
	if (process == NULL)
	{
	xfree (argv);
	return gpg_err_code_from_syserror ();
	}

	process->pgmname = pgmname;
	process->flags = flags;

	if ((flags & GNUPG_PROCESS_STDINOUT_SOCKETPAIR))
	{
	ec = do_create_socketpair (fd_in);
	if (ec)
	{
	xfree (process);
	xfree (argv);
	return ec;
	}
	fd_out[0] = dup (fd_in[0]);
	fd_out[1] = dup (fd_in[1]);
	}
	else
	{
	if ((flags & GNUPG_PROCESS_STDIN_PIPE))
	{
	ec = do_create_pipe (fd_in);
	if (ec)
	{
	xfree (process);
	xfree (argv);
	return ec;
	}
	}
	else if ((flags & GNUPG_PROCESS_STDIN_KEEP))
	{
	fd_in[0] = 0;
	fd_in[1] = -1;
	}
	else
	{
	fd_in[0] = -1;
	fd_in[1] = -1;
	}

	if ((flags & GNUPG_PROCESS_STDOUT_PIPE))
	{
	ec = do_create_pipe (fd_out);
	if (ec)
	{
	if (fd_in[0] >= 0 && fd_in[0] != 0)
	close (fd_in[0]);
	if (fd_in[1] >= 0)
	close (fd_in[1]);
	xfree (process);
	xfree (argv);
	return ec;
	}
	}
	else if ((flags & GNUPG_PROCESS_STDOUT_KEEP))
	{
	fd_out[0] = -1;
	fd_out[1] = 1;
	}
	else
	{
	fd_out[0] = -1;
	fd_out[1] = -1;
	}
	}

	if ((flags & GNUPG_PROCESS_STDERR_PIPE))
	{
	ec = do_create_pipe (fd_err);
	if (ec)
	{
	if (fd_in[0] >= 0 && fd_in[0] != 0)
	close (fd_in[0]);
	if (fd_in[1] >= 0)
	close (fd_in[1]);
	if (fd_out[0] >= 0)
	close (fd_out[0]);
	if (fd_out[1] >= 0 && fd_out[1] != 1)
	close (fd_out[1]);
	xfree (process);
	xfree (argv);
	return ec;
	}
	}
	else if ((flags & GNUPG_PROCESS_STDERR_KEEP))
	{
	fd_err[0] = -1;
	fd_err[1] = 2;
	}
	else
	{
	fd_err[0] = -1;
	fd_err[1] = -1;
	}

	pre_syscall ();
	pid = fork ();
	post_syscall ();
	if (pid == (pid_t)(-1))
	{
	ec = gpg_err_code_from_syserror ();
	log_error (_("error forking process: %s\n"), gpg_strerror (ec));
	if (fd_in[0] >= 0 && fd_in[0] != 0)
	close (fd_in[0]);
	if (fd_in[1] >= 0)
	close (fd_in[1]);
	if (fd_out[0] >= 0)
	close (fd_out[0]);
	if (fd_out[1] >= 0 && fd_out[1] != 1)
	close (fd_out[1]);
	if (fd_err[0] >= 0)
	close (fd_err[0]);
	if (fd_err[1] >= 0 && fd_err[1] != 2)
	close (fd_err[1]);
	xfree (process);
	xfree (argv);
	return ec;
	}

	if (!pid)
	{
	struct spawn_cb_arg sca;

	if (fd_in[1] >= 0)
	close (fd_in[1]);
	if (fd_out[0] >= 0)
	close (fd_out[0]);
	if (fd_err[0] >= 0)
	close (fd_err[0]);

	call_spawn_cb (&sca, fd_in[0], fd_out[1], fd_err[1],
	spawn_cb, spawn_cb_arg);

	/* Run child. */
	my_exec (pgmname, argv, &sca);
	/NOTREACHED/
	}

	xfree (argv);
	process->pid = pid;

	if (fd_in[0] >= 0 && fd_in[0] != 0)
	close (fd_in[0]);
	if (fd_out[1] >= 0 && fd_out[1] != 1)
	close (fd_out[1]);
	if (fd_err[1] >= 0 && fd_err[1] != 2)
	close (fd_err[1]);
	process->fd_in = fd_in[1];
	process->fd_out = fd_out[0];
	process->fd_err = fd_err[0];
	process->wstatus = -1;
	process->terminated = 0;

	if (r_process == NULL)
	{
	ec = gnupg_process_wait (process, 1);
	gnupg_process_release (process);
	return ec;
	}

	*r_process = process;
	return 0;
	}

	static gpg_err_code_t
	process_kill (gnupg_process_t process, int sig)
	{
	gpg_err_code_t ec = 0;
	pid_t pid = process->pid;

	pre_syscall ();
	if (kill (pid, sig) < 0)
	ec = gpg_err_code_from_syserror ();
	post_syscall ();
	return ec;
	}

	gpg_err_code_t
	gnupg_process_terminate (gnupg_process_t process)
	{
	return process_kill (process, SIGTERM);
	}

	gpg_err_code_t
	gnupg_process_get_fds (gnupg_process_t process, unsigned int flags,
	int r_fd_in, int r_fd_out, int *r_fd_err)
	{
	(void)flags;
	if (r_fd_in)
	{
	*r_fd_in = process->fd_in;
	process->fd_in = -1;
	}
	if (r_fd_out)
	{
	*r_fd_out = process->fd_out;
	process->fd_out = -1;
	}
	if (r_fd_err)
	{
	*r_fd_err = process->fd_err;
	process->fd_err = -1;
	}

	return 0;
	}

	gpg_err_code_t
	gnupg_process_get_streams (gnupg_process_t process, unsigned int flags,
	gpgrt_stream_t r_fp_in, gpgrt_stream_t r_fp_out,
	gpgrt_stream_t *r_fp_err)
	{
	int nonblock = (flags & GNUPG_PROCESS_STREAM_NONBLOCK)? 1: 0;

	if (r_fp_in)
	{
	*r_fp_in = es_fdopen (process->fd_in, nonblock? "w,nonblock" : "w");
	process->fd_in = -1;
	}
	if (r_fp_out)
	{
	*r_fp_out = es_fdopen (process->fd_out, nonblock? "r,nonblock" : "r");
	process->fd_out = -1;
	}
	if (r_fp_err)
	{
	*r_fp_err = es_fdopen (process->fd_err, nonblock? "r,nonblock" : "r");
	process->fd_err = -1;
	}
	return 0;
	}

	static gpg_err_code_t
	process_vctl (gnupg_process_t process, unsigned int request, va_list arg_ptr)
	{
	switch (request)
	{
	case GNUPG_PROCESS_NOP:
	return 0;

	case GNUPG_PROCESS_GET_PROC_ID:
	{
	int r_id = va_arg (arg_ptr, int );

	if (r_id == NULL)
	return GPG_ERR_INV_VALUE;

	*r_id = (int)process->pid;
	return 0;
	}

	case GNUPG_PROCESS_GET_EXIT_ID:
	{
	int status = process->wstatus;
	int r_exit_status = va_arg (arg_ptr, int );

	if (!process->terminated)
	return GPG_ERR_UNFINISHED;

	if (WIFEXITED (status))
	{
	if (r_exit_status)
	*r_exit_status = WEXITSTATUS (status);
	}
	else
	*r_exit_status = -1;

	return 0;
	}

	case GNUPG_PROCESS_GET_PID:
	{
	pid_t r_pid = va_arg (arg_ptr, pid_t );

	if (r_pid == NULL)
	return GPG_ERR_INV_VALUE;

	*r_pid = process->pid;
	return 0;
	}

	case GNUPG_PROCESS_GET_WSTATUS:
	{
	int status = process->wstatus;
	int r_if_exited = va_arg (arg_ptr, int );
	int r_if_signaled = va_arg (arg_ptr, int );
	int r_exit_status = va_arg (arg_ptr, int );
	int r_termsig = va_arg (arg_ptr, int );

	if (!process->terminated)
	return GPG_ERR_UNFINISHED;

	if (WIFEXITED (status))
	{
	if (r_if_exited)
	*r_if_exited = 1;
	if (r_if_signaled)
	*r_if_signaled = 0;
	if (r_exit_status)
	*r_exit_status = WEXITSTATUS (status);
	if (r_termsig)
	*r_termsig = 0;
	}
	else if (WIFSIGNALED (status))
	{
	if (r_if_exited)
	*r_if_exited = 0;
	if (r_if_signaled)
	*r_if_signaled = 1;
	if (r_exit_status)
	*r_exit_status = 0;
	if (r_termsig)
	*r_termsig = WTERMSIG (status);
	}

	return 0;
	}

	case GNUPG_PROCESS_KILL:
	{
	int sig = va_arg (arg_ptr, int);

	return process_kill (process, sig);
	}

	default:
	break;
	}

	return GPG_ERR_UNKNOWN_COMMAND;
	}

	gpg_err_code_t
	gnupg_process_ctl (gnupg_process_t process, unsigned int request, ...)
	{
	va_list arg_ptr;
	gpg_err_code_t ec;

	va_start (arg_ptr, request);
	ec = process_vctl (process, request, arg_ptr);
	va_end (arg_ptr);
	return ec;
	}

	gpg_err_code_t
	gnupg_process_wait (gnupg_process_t process, int hang)
	{
	gpg_err_code_t ec;
	int status;
	pid_t pid;

	if (process->terminated)
	/* Already terminated. */
	return 0;

	pre_syscall ();
	while ((pid = waitpid (process->pid, &status, hang? 0: WNOHANG))
	== (pid_t)(-1) && errno == EINTR);
	post_syscall ();

	if (pid == (pid_t)(-1))
	{
	ec = gpg_err_code_from_syserror ();
	log_error (_("waiting for process %d to terminate failed: %s\n"),
	(int)pid, gpg_strerror (ec));
	}
	else if (!pid)
	{
	ec = GPG_ERR_TIMEOUT; /* Still running. */
	}
	else
	{
	process->terminated = 1;
	process->wstatus = status;
	ec = 0;
	}

	return ec;
	}

	void
	gnupg_process_release (gnupg_process_t process)
	{
	if (!process)
	return;

	if (process->terminated)
	{
	gnupg_process_terminate (process);
	gnupg_process_wait (process, 1);
	}

	xfree (process);
	}

	gpg_err_code_t
	gnupg_process_wait_list (gnupg_process_t *process_list, int count, int hang)
	{
	gpg_err_code_t ec = 0;
	int i;

	for (i = 0; i < count; i++)
	{
	if (process_list[i]->terminated)
	continue;

	ec = gnupg_process_wait (process_list[i], hang);
	if (ec)
	break;
	}

	return ec;
	}

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