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/* -*- c-file-style: "linux" -*-
*
* Copyright (C) 1996-2000 by Andrew Tridgell
* Copyright (C) Paul Mackerras 1996
* Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "rsync.h"
/**
* Create a child connected to use on stdin/stdout.
*
* This is derived from CVS code
*
* Note that in the child STDIN is set to blocking and STDOUT
* is set to non-blocking. This is necessary as rsh relies on stdin being blocking
* and ssh relies on stdout being non-blocking
*
* If blocking_io is set then use blocking io on both fds. That can be
* used to cope with badly broken rsh implementations like the one on
* Solaris.
**/
pid_t piped_child(char **command, int *f_in, int *f_out)
{
pid_t pid;
int to_child_pipe[2];
int from_child_pipe[2];
extern int blocking_io;
if (verbose >= 2) {
print_child_argv(command);
}
if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) {
rprintf(FERROR, "pipe: %s\n", strerror(errno));
exit_cleanup(RERR_IPC);
}
pid = do_fork();
if (pid == -1) {
rprintf(FERROR, "fork: %s\n", strerror(errno));
exit_cleanup(RERR_IPC);
}
if (pid == 0) {
extern int orig_umask;
if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
close(to_child_pipe[1]) < 0 ||
close(from_child_pipe[0]) < 0 ||
dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
rprintf(FERROR, "Failed to dup/close : %s\n",
strerror(errno));
exit_cleanup(RERR_IPC);
}
if (to_child_pipe[0] != STDIN_FILENO)
close(to_child_pipe[0]);
if (from_child_pipe[1] != STDOUT_FILENO)
close(from_child_pipe[1]);
umask(orig_umask);
set_blocking(STDIN_FILENO);
if (blocking_io) {
set_blocking(STDOUT_FILENO);
}
execvp(command[0], command);
rprintf(FERROR, "Failed to exec %s : %s\n",
command[0], strerror(errno));
exit_cleanup(RERR_IPC);
}
if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) {
rprintf(FERROR, "Failed to close : %s\n", strerror(errno));
exit_cleanup(RERR_IPC);
}
*f_in = from_child_pipe[0];
*f_out = to_child_pipe[1];
return pid;
}
pid_t local_child(int argc, char **argv,int *f_in,int *f_out,
int (*child_main)(int, char*[]))
{
pid_t pid;
int to_child_pipe[2];
int from_child_pipe[2];
extern int read_batch;
extern int am_sender;
extern int am_server;
extern int filesfrom_fd;
if (fd_pair(to_child_pipe) < 0 ||
fd_pair(from_child_pipe) < 0) {
rprintf(FERROR,"pipe: %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
pid = do_fork();
if (pid == -1) {
rprintf(FERROR,"fork: %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
if (pid == 0) {
am_sender = read_batch ? 0 : !am_sender;
am_server = 1;
if (!am_sender)
filesfrom_fd = -1;
if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
close(to_child_pipe[1]) < 0 ||
close(from_child_pipe[0]) < 0 ||
dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]);
if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]);
child_main(argc, argv);
}
if (!am_sender)
filesfrom_fd = -1;
if (close(from_child_pipe[1]) < 0 ||
close(to_child_pipe[0]) < 0) {
rprintf(FERROR,"Failed to close : %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
*f_in = from_child_pipe[0];
*f_out = to_child_pipe[1];
return pid;
}
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