-/* -*- 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>
- *
+/*
+ * Routines used to setup various kinds of inter-process pipes.
+ *
+ * Copyright (C) 1996-2000 Andrew Tridgell
+ * Copyright (C) 1996 Paul Mackerras
+ * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
+ * Copyright (C) 2004-2007 Wayne Davison
+ *
* 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.
- *
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
* 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, visit the http://fsf.org website.
*/
#include "rsync.h"
+extern int am_sender;
+extern int am_server;
+extern int blocking_io;
+extern int filesfrom_fd;
+extern mode_t orig_umask;
+extern char *logfile_name;
+extern struct chmod_mode_struct *chmod_modes;
+
/**
- * 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) {
+
+ 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)
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", 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,
+/* 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;
- extern int am_sender;
- extern int am_server;
- extern int filesfrom_fd;
+
+ /* The parent process is always the sender for a local rsync. */
+ assert(am_sender);
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) {
- am_sender = read_batch ? 0 : !am_sender;
- am_server = 1;
-
- if (!am_sender)
- filesfrom_fd = -1;
+ am_sender = 0;
+ am_server = 1;
+ filesfrom_fd = -1;
+ chmod_modes = NULL; /* Let the sending side handle this. */
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;
+ /* Let the client side handle this. */
+ if (logfile_name) {
+ logfile_name = NULL;
+ logfile_close();
+ }
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;
}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff