+/* -*- 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"
+extern int am_sender;
+extern int am_server;
+extern int blocking_io;
+extern int orig_umask;
+extern int filesfrom_fd;
+
/**
- * Create a child connected to use on stdin/stdout.
+ * Create a child connected to us via its stdin/stdout.
+ *
+ * This is derived from CVS code
*
- * 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
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));
+ rsyserr(FERROR, errno, "pipe");
exit_cleanup(RERR_IPC);
}
-
pid = do_fork();
if (pid == -1) {
- rprintf(FERROR, "fork: %s\n", strerror(errno));
+ rsyserr(FERROR, errno, "fork");
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));
+ rsyserr(FERROR, errno, "Failed to dup/close");
exit_cleanup(RERR_IPC);
}
if (to_child_pipe[0] != STDIN_FILENO)
close(from_child_pipe[1]);
umask(orig_umask);
set_blocking(STDIN_FILENO);
- if (blocking_io) {
+ if (blocking_io > 0)
set_blocking(STDOUT_FILENO);
- }
execvp(command[0], command);
- rprintf(FERROR, "Failed to exec %s : %s\n",
- command[0], strerror(errno));
+ rsyserr(FERROR, errno, "Failed to exec %s",
+ safe_fname(command[0]));
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));
+ rsyserr(FERROR, errno, "Failed to close");
exit_cleanup(RERR_IPC);
}
return pid;
}
-pid_t local_child(int argc, char **argv,int *f_in,int *f_out,
- int (*child_main)(int, char **))
+/* This function forks a child which calls child_main(). First,
+ * however, it has to establish communication paths to and from the
+ * newborn child. It creates two socket pairs -- one for writing to
+ * the child (from the parent) and one for reading from the child
+ * (writing to the parent). Since that's four socket ends, each
+ * process has to close the two ends it doesn't need. The remaining
+ * two socket ends are retained for reading and writing. In the
+ * child, the STDIN and STDOUT file descriptors refer to these
+ * sockets. In the parent, the function arguments f_in and f_out are
+ * set to refer to these sockets. */
+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; /* dw */
if (fd_pair(to_child_pipe) < 0 ||
fd_pair(from_child_pipe) < 0) {
- rprintf(FERROR,"pipe: %s\n",strerror(errno));
+ rsyserr(FERROR, errno, "pipe");
exit_cleanup(RERR_IPC);
}
-
pid = do_fork();
if (pid == -1) {
- rprintf(FERROR,"fork: %s\n",strerror(errno));
+ rsyserr(FERROR, errno, "fork");
exit_cleanup(RERR_IPC);
}
if (pid == 0) {
- extern int am_sender;
- extern int am_server;
+ am_sender = !am_sender;
+ am_server = 1;
- 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));
+ rsyserr(FERROR, errno, "Failed to dup/close");
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]);
+ 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));
+ rsyserr(FERROR, errno, "Failed to close");
exit_cleanup(RERR_IPC);
}
*f_in = from_child_pipe[0];
*f_out = to_child_pipe[1];
-
+
return pid;
}
-
-