X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/7c2a9e766c0e162773b291b916521297f24d57c4..b3bf9b9df95137a3a43248be9599d919b04877af:/pipe.c

diff --git a/pipe.c b/pipe.c
index 59a0d762..a33117c4 100644
--- a/pipe.c
+++ b/pipe.c
@@ -1,31 +1,43 @@
-/*  -*- 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) 2004-2009 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
+ * the Free Software Foundation; either version 3 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.
+ *
+ * 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 int munge_symlinks;
+extern mode_t orig_umask;
+extern char *logfile_name;
+extern int remote_option_cnt;
+extern const char **remote_options;
+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
@@ -39,32 +51,27 @@ 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 (DEBUG_GTE(CMD, 1))
+		print_child_argv("opening connection using:", 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)
@@ -73,17 +80,15 @@ pid_t piped_child(char **command, int *f_in, int *f_out)
 			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", 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);
 	}
 
@@ -93,60 +98,85 @@ pid_t piped_child(char **command, int *f_in, int *f_out)
 	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;		
+		am_sender = 0;
+		am_server = 1;
+		filesfrom_fd = -1;
+		munge_symlinks = 0; /* Each side needs its own option. */
+		chmod_modes = NULL; /* Let the sending side handle this. */
+
+		/* Let the client side handle this. */
+		if (logfile_name) {
+			logfile_name = NULL;
+			logfile_close();
+		}
 
-		if (!am_sender)
-			filesfrom_fd = -1;
+		if (remote_option_cnt) {
+			int rc = remote_option_cnt + 1;
+			const char **rv = remote_options;
+			if (!parse_arguments(&rc, &rv)) {
+				option_error();
+				exit_cleanup(RERR_SYNTAX);
+			}
+		}
 
 		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]);
+#ifdef ICONV_CONST
+		setup_iconv();
+#endif
 		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;
 }