259c65d94f
* io.h: Rename to ... * priv-io.h: ... this. * Makefile.am (libgpgme_real_la_SOURCES): Change io.h to priv-io.h. * data.c, engine-gpgsm.c, posix-io.c, rungpg.c, version.c, w32-io.c, wait-private.c, wait-global.c, wait-user.c, wait.c: Change all includes of "io.h" to "priv-io.h"
412 lines
8.8 KiB
C
412 lines
8.8 KiB
C
/* posix-io.c - Posix I/O functions
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Copyright (C) 2000 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2004, 2005 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "util.h"
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#include "priv-io.h"
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#include "sema.h"
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#include "ath.h"
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#include "debug.h"
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void
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_gpgme_io_subsystem_init (void)
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{
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struct sigaction act;
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sigaction (SIGPIPE, NULL, &act);
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if (act.sa_handler == SIG_DFL)
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{
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act.sa_handler = SIG_IGN;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction (SIGPIPE, &act, NULL);
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}
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}
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static struct
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{
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void (*handler) (int,void*);
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void *value;
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} notify_table[256];
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int
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_gpgme_io_read (int fd, void *buffer, size_t count)
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{
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int nread;
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int saved_errno;
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DEBUG2 ("fd %d: about to read %d bytes\n", fd, (int) count);
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do
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{
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nread = _gpgme_ath_read (fd, buffer, count);
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}
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while (nread == -1 && errno == EINTR);
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saved_errno = errno;
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DEBUG2 ("fd %d: got %d bytes\n", fd, nread);
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if (nread > 0)
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_gpgme_debug (2, "fd %d: got `%.*s'\n", fd, nread, buffer);
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errno = saved_errno;
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return nread;
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}
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int
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_gpgme_io_write (int fd, const void *buffer, size_t count)
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{
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int saved_errno;
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int nwritten;
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DEBUG2 ("fd %d: about to write %d bytes\n", fd, (int) count);
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_gpgme_debug (2, "fd %d: write `%.*s'\n", fd, (int) count, buffer);
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do
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{
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nwritten = _gpgme_ath_write (fd, buffer, count);
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}
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while (nwritten == -1 && errno == EINTR);
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saved_errno = errno;
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DEBUG2 ("fd %d: wrote %d bytes\n", fd, (int) nwritten);
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errno = saved_errno;
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return nwritten;
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}
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int
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_gpgme_io_pipe (int filedes[2], int inherit_idx)
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{
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int saved_errno;
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int err;
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err = pipe (filedes);
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if (err < 0)
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return err;
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/* FIXME: Should get the old flags first. */
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err = fcntl (filedes[1 - inherit_idx], F_SETFD, FD_CLOEXEC);
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saved_errno = errno;
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if (err < 0)
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{
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close (filedes[0]);
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close (filedes[1]);
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}
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errno = saved_errno;
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return err;
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}
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int
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_gpgme_io_close (int fd)
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{
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if (fd == -1)
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return -1;
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/* First call the notify handler. */
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DEBUG1 ("closing fd %d", fd);
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if (fd >= 0 && fd < (int) DIM (notify_table))
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{
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if (notify_table[fd].handler)
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{
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notify_table[fd].handler (fd, notify_table[fd].value);
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notify_table[fd].handler = NULL;
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notify_table[fd].value = NULL;
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}
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}
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/* Then do the close. */
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return close (fd);
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}
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int
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_gpgme_io_set_close_notify (int fd, void (*handler)(int, void*), void *value)
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{
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assert (fd != -1);
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if (fd < 0 || fd >= (int) DIM (notify_table))
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return -1;
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DEBUG1 ("set notification for fd %d", fd);
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notify_table[fd].handler = handler;
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notify_table[fd].value = value;
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return 0;
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}
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int
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_gpgme_io_set_nonblocking (int fd)
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{
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int flags;
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flags = fcntl (fd, F_GETFL, 0);
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if (flags == -1)
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return -1;
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flags |= O_NONBLOCK;
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return fcntl (fd, F_SETFL, flags);
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}
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/* Returns 0 on success, -1 on error. */
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int
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_gpgme_io_spawn (const char *path, char **argv,
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struct spawn_fd_item_s *fd_child_list,
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struct spawn_fd_item_s *fd_parent_list)
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{
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pid_t pid;
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int i;
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int status, signo;
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pid = fork ();
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if (pid == -1)
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return -1;
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if (!pid)
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{
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/* Intermediate child to prevent zombie processes. */
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if ((pid = fork ()) == 0)
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{
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/* Child. */
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int duped_stdin = 0;
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int duped_stderr = 0;
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/* First close all fds which will not be duped. */
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for (i=0; fd_child_list[i].fd != -1; i++)
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if (fd_child_list[i].dup_to == -1)
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close (fd_child_list[i].fd);
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/* And now dup and close the rest. */
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for (i=0; fd_child_list[i].fd != -1; i++)
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{
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if (fd_child_list[i].dup_to != -1)
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{
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if (dup2 (fd_child_list[i].fd,
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fd_child_list[i].dup_to) == -1)
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{
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DEBUG1 ("dup2 failed in child: %s\n", strerror (errno));
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_exit (8);
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}
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if (fd_child_list[i].dup_to == 0)
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duped_stdin=1;
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if (fd_child_list[i].dup_to == 2)
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duped_stderr=1;
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close (fd_child_list[i].fd);
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}
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}
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if (!duped_stdin || !duped_stderr)
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{
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int fd = open ("/dev/null", O_RDWR);
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if (fd == -1)
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{
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DEBUG1 ("can't open `/dev/null': %s\n", strerror (errno));
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_exit (8);
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}
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/* Make sure that the process has a connected stdin. */
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if (!duped_stdin)
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{
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if (dup2 (fd, 0) == -1)
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{
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DEBUG1("dup2(/dev/null, 0) failed: %s\n",
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strerror (errno));
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_exit (8);
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}
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}
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if (!duped_stderr)
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if (dup2 (fd, 2) == -1)
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{
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DEBUG1 ("dup2(dev/null, 2) failed: %s\n",
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strerror (errno));
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_exit (8);
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}
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close (fd);
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}
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execv ( path, argv );
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/* Hmm: in that case we could write a special status code to the
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status-pipe. */
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DEBUG1 ("exec of `%s' failed\n", path);
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_exit (8);
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} /* End child. */
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if (pid == -1)
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_exit (1);
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else
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_exit (0);
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}
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_gpgme_io_waitpid (pid, 1, &status, &signo);
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if (status)
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return -1;
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/* .dup_to is not used in the parent list. */
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for (i = 0; fd_parent_list[i].fd != -1; i++)
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_gpgme_io_close (fd_parent_list[i].fd);
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return 0;
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}
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int
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_gpgme_io_waitpid (int pid, int hang, int *r_status, int *r_signal)
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{
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int status;
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*r_status = 0;
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*r_signal = 0;
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if (_gpgme_ath_waitpid (pid, &status, hang? 0 : WNOHANG) == pid)
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{
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if (WIFSIGNALED (status))
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{
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*r_status = 4; /* Need some value here. */
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*r_signal = WTERMSIG (status);
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}
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else if (WIFEXITED (status))
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*r_status = WEXITSTATUS (status);
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else
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*r_status = 4; /* Oops. */
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return 1;
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}
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return 0;
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}
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int
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_gpgme_io_kill (int pid, int hard)
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{
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return kill (pid, hard ? SIGKILL : SIGTERM);
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}
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/*
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* Select on the list of fds.
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* Returns: -1 = error
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* 0 = timeout or nothing to select
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* >0 = number of signaled fds
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*/
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int
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_gpgme_io_select (struct io_select_fd_s *fds, size_t nfds, int nonblock)
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{
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fd_set readfds;
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fd_set writefds;
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unsigned int i;
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int any, max_fd, n, count;
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struct timeval timeout = { 1, 0 }; /* Use a 1s timeout. */
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void *dbg_help = NULL;
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FD_ZERO (&readfds);
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FD_ZERO (&writefds);
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max_fd = 0;
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if (nonblock)
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timeout.tv_sec = 0;
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DEBUG_BEGIN (dbg_help, 3, "gpgme:select on [ ");
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any = 0;
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for (i = 0; i < nfds; i++)
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{
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if (fds[i].fd == -1)
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continue;
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if (fds[i].frozen)
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DEBUG_ADD1 (dbg_help, "f%d ", fds[i].fd);
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else if (fds[i].for_read)
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{
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assert (!FD_ISSET (fds[i].fd, &readfds));
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FD_SET (fds[i].fd, &readfds);
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if (fds[i].fd > max_fd)
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max_fd = fds[i].fd;
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DEBUG_ADD1 (dbg_help, "r%d ", fds[i].fd);
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any = 1;
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}
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else if (fds[i].for_write)
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{
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assert (!FD_ISSET (fds[i].fd, &writefds));
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FD_SET (fds[i].fd, &writefds);
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if (fds[i].fd > max_fd)
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max_fd = fds[i].fd;
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DEBUG_ADD1 (dbg_help, "w%d ", fds[i].fd);
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any = 1;
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}
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fds[i].signaled = 0;
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}
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DEBUG_END (dbg_help, "]");
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if (!any)
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return 0;
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do
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{
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count = _gpgme_ath_select (max_fd + 1, &readfds, &writefds, NULL,
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&timeout);
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}
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while (count < 0 && errno == EINTR);
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if (count < 0)
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{
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int saved_errno = errno;
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DEBUG1 ("_gpgme_io_select failed: %s\n", strerror (errno));
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errno = saved_errno;
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return -1; /* error */
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}
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DEBUG_BEGIN (dbg_help, 3, "select OK [ ");
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if (DEBUG_ENABLED (dbg_help))
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{
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for (i = 0; i <= max_fd; i++)
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{
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if (FD_ISSET (i, &readfds))
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DEBUG_ADD1 (dbg_help, "r%d ", i);
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if (FD_ISSET (i, &writefds))
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DEBUG_ADD1 (dbg_help, "w%d ", i);
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}
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DEBUG_END (dbg_help, "]");
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}
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/* n is used to optimize it a little bit. */
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for (n = count, i = 0; i < nfds && n; i++)
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{
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if (fds[i].fd == -1)
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;
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else if (fds[i].for_read)
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{
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if (FD_ISSET (fds[i].fd, &readfds))
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{
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fds[i].signaled = 1;
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n--;
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}
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}
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else if (fds[i].for_write)
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{
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if (FD_ISSET (fds[i].fd, &writefds))
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{
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fds[i].signaled = 1;
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n--;
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}
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}
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}
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return count;
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}
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