309 lines
8.0 KiB
C
309 lines
8.0 KiB
C
/* posix-io.c - Posix I/O functions
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* Copyright (C) 2000 Werner Koch (dd9jn)
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*
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* This file is part of GPGME.
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*
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* GPGME is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GPGME is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#ifndef HAVE_DOSISH_SYSTEM
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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 <sys/time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <fcntl.h>
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#include "syshdr.h"
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#include "io.h"
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#define DEBUG_SELECT_ENABLED 0
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#if DEBUG_SELECT_ENABLED
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# define DEBUG_SELECT(a) fprintf a
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#else
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# define DEBUG_SELECT(a) do { } while(0)
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#endif
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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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do {
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nread = read (fd, buffer, count);
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} while (nread == -1 && errno == EINTR );
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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 nwritten;
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do {
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nwritten = write (fd, buffer, count);
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} while (nwritten == -1 && errno == EINTR );
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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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/* we don't need inherit_idx in this implementation */
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return pipe ( filedes );
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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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return close (fd);
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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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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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static volatile int fixed_signals;
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pid_t pid;
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int i;
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if ( !fixed_signals ) {
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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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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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fixed_signals = 1;
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/* fixme: This is not really MT safe */
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}
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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 ) { /* 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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}
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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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if (fd_child_list[i].dup_to != -1 ) {
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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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fprintf (stderr, "dup2 failed in child: %s\n",
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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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int fd = open ( "/dev/null", O_RDWR );
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if ( fd == -1 ) {
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fprintf (stderr,"can't open `/dev/null': %s\n",
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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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if ( dup2 ( fd, 0 ) == -1 ) {
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fprintf (stderr,"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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/* We normally don't want all the normal output */
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if ( !duped_stderr ) {
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if (!getenv ("GPGME_DEBUG") ) {
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if ( dup2 ( fd, 2 ) == -1 ) {
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fprintf (stderr,"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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}
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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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fprintf (stderr,"exec of `%s' failed\n", path );
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_exit (8);
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} /* end child */
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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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close (fd_parent_list[i].fd);
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}
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return (int)pid;
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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 ( waitpid ( pid, &status, hang? 0 : WNOHANG ) == pid ) {
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if ( WIFSIGNALED (status) ) {
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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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}
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else {
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*r_status = 4; /* oops */
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}
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return 1;
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}
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return 0;
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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 )
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{
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static fd_set readfds;
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static fd_set writefds;
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int any, i, max_fd, n, count;
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struct timeval timeout = { 0, 50 }; /* Use a 50ms timeout */
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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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DEBUG_SELECT ((stderr, "gpgme:select on [ "));
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any = 0;
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for ( i=0; i < nfds; i++ ) {
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if ( fds[i].fd == -1 )
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continue;
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if ( fds[i].for_read ) {
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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_SELECT ((stderr, "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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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_SELECT ((stderr, "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_SELECT ((stderr, "]\n" ));
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if ( !any )
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return 0;
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do {
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count = select ( max_fd+1, &readfds, &writefds, NULL, &timeout );
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} while ( count < 0 && errno == EINTR);
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if ( count < 0 ) {
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fprintf (stderr, "_gpgme_io_select failed: %s\n", strerror (errno) );
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return -1; /* error */
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}
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#if DEBUG_SELECT_ENABLED
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fprintf (stderr, "gpgme:select OK [ " );
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for (i=0; i <= max_fd; i++ ) {
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if (FD_ISSET (i, &readfds) )
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fprintf (stderr, "r%d ", i );
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if (FD_ISSET (i, &writefds) )
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fprintf (stderr, "w%d ", i );
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}
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fprintf (stderr, "]\n" );
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#endif
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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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if ( fds[i].fd == -1 )
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;
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else if ( fds[i].for_read ) {
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if ( FD_ISSET ( fds[i].fd, &readfds ) ) {
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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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if ( FD_ISSET ( fds[i].fd, &writefds ) ) {
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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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#endif /*!HAVE_DOSISH_SYSTEM*/
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