-/* -*- c-file-style: "linux" -*-
+/*
+ * Socket and pipe I/O utilities used in rsync.
*
- * Copyright (C) 1996-2001 by Andrew Tridgell
- * Copyright (C) Paul Mackerras 1996
- * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
+ * Copyright (C) 1996-2001 Andrew Tridgell
+ * Copyright (C) 1996 Paul Mackerras
+ * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
+ * Copyright (C) 2003, 2004, 2005, 2006 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
* 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
-/**
- * @file io.c
- *
- * Socket and pipe I/O utilities used in rsync.
- *
- * rsync provides its own multiplexing system, which is used to send
- * stderr and stdout over a single socket. We need this because
- * stdout normally carries the binary data stream, and stderr all our
- * error messages.
+/* Rsync provides its own multiplexing system, which is used to send
+ * stderr and stdout over a single socket.
*
* For historical reasons this is off during the start of the
* connection, but it's switched on quite early using
- * io_start_multiplex_out() and io_start_multiplex_in().
- **/
+ * io_start_multiplex_out() and io_start_multiplex_in(). */
#include "rsync.h"
extern int csum_length;
extern int checksum_seed;
extern int protocol_version;
-extern int remove_sent_files;
+extern int remove_source_files;
extern int preserve_hard_links;
extern char *filesfrom_host;
extern struct stats stats;
int batch_fd = -1;
int batch_gen_fd = -1;
-/**
- * The connection might be dropped at some point; perhaps because the
- * remote instance crashed. Just giving the offset on the stream is
- * not very helpful. So instead we try to make io_phase_name point to
- * something useful.
- *
- * For buffered/multiplexed I/O these names will be somewhat
- * approximate; perhaps for ease of support we would rather make the
- * buffer always flush when a single application-level I/O finishes.
- *
- * @todo Perhaps we want some simple stack functionality, but there's
- * no need to overdo it.
- **/
-const char *io_write_phase = phase_unknown;
-const char *io_read_phase = phase_unknown;
-
/* Ignore an EOF error if non-zero. See whine_about_eof(). */
int kluge_around_eof = 0;
static char *io_filesfrom_bp;
static char io_filesfrom_lastchar;
static int io_filesfrom_buflen;
-static size_t contiguous_write_len = 0;
+static int defer_forwarding_messages = 0;
static int select_timeout = SELECT_TIMEOUT;
static int active_filecnt = 0;
static OFF_T active_bytecnt = 0;
struct msg_list_item {
struct msg_list_item *next;
- char *buf;
int len;
+ char buf[1];
};
struct msg_list {
struct msg_list_item *head, *tail;
};
-static struct msg_list msg_list;
+static struct msg_list msg2genr, msg2sndr;
static void flist_ndx_push(struct flist_ndx_list *lp, int ndx)
{
}
/* Add a message to the pending MSG_* list. */
-static void msg_list_add(int code, char *buf, int len)
+static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len)
{
- struct msg_list_item *ml;
+ struct msg_list_item *m;
+ int sz = len + 4 + sizeof m[0] - 1;
- if (!(ml = new(struct msg_list_item)))
- out_of_memory("msg_list_add");
- ml->next = NULL;
- if (!(ml->buf = new_array(char, len+4)))
+ if (!(m = (struct msg_list_item *)new_array(char, sz)))
out_of_memory("msg_list_add");
- SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len);
- memcpy(ml->buf+4, buf, len);
- ml->len = len+4;
- if (msg_list.tail)
- msg_list.tail->next = ml;
+ m->next = NULL;
+ m->len = len + 4;
+ SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len);
+ memcpy(m->buf + 4, buf, len);
+ if (lst->tail)
+ lst->tail->next = m;
else
- msg_list.head = ml;
- msg_list.tail = ml;
+ lst->head = m;
+ lst->tail = m;
}
/* Read a message from the MSG_* fd and handle it. This is called either
exit_cleanup(RERR_STREAMIO);
}
read_loop(fd, buf, 4);
- if (remove_sent_files)
+ if (remove_source_files)
decrement_active_files(IVAL(buf,0));
flist_ndx_push(&redo_list, IVAL(buf,0));
break;
exit_cleanup(RERR_STREAMIO);
}
read_loop(fd, buf, len);
- io_multiplex_write(MSG_DELETED, buf, len);
+ send_msg(MSG_DELETED, buf, len);
break;
case MSG_SUCCESS:
if (len != 4 || !am_generator) {
exit_cleanup(RERR_STREAMIO);
}
read_loop(fd, buf, len);
- if (remove_sent_files) {
+ if (remove_source_files) {
decrement_active_files(IVAL(buf,0));
- io_multiplex_write(MSG_SUCCESS, buf, len);
+ send_msg(MSG_SUCCESS, buf, len);
}
if (preserve_hard_links)
flist_ndx_push(&hlink_list, IVAL(buf,0));
if (n >= sizeof buf)
n = sizeof buf - 1;
read_loop(fd, buf, n);
- rwrite((enum logcode)tag, buf, n);
+ rwrite(tag, buf, n);
len -= n;
}
break;
default:
- rprintf(FERROR, "unknown message %d:%d\n", tag, len);
+ rprintf(FERROR, "unknown message %d:%d [%s]\n",
+ tag, len, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
}
/* This is used by the generator to limit how many file transfers can
- * be active at once when --remove-sent-files is specified. Without
+ * be active at once when --remove-source-files is specified. Without
* this, sender-side deletions were mostly happening at the end. */
void increment_active_files(int ndx, int itemizing, enum logcode code)
{
/* Try to push messages off the list onto the wire. If we leave with more
* to do, return 0. On error, return -1. If everything flushed, return 1.
* This is only active in the receiver. */
-static int msg_list_flush(int flush_it_all)
+static int msg2genr_flush(int flush_it_all)
{
static int written = 0;
struct timeval tv;
if (msg_fd_out < 0)
return -1;
- while (msg_list.head) {
- struct msg_list_item *ml = msg_list.head;
- int n = write(msg_fd_out, ml->buf + written, ml->len - written);
+ while (msg2genr.head) {
+ struct msg_list_item *m = msg2genr.head;
+ int n = write(msg_fd_out, m->buf + written, m->len - written);
if (n < 0) {
if (errno == EINTR)
continue;
tv.tv_usec = 0;
if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv))
check_timeout();
- } else if ((written += n) == ml->len) {
- free(ml->buf);
- msg_list.head = ml->next;
- if (!msg_list.head)
- msg_list.tail = NULL;
- free(ml);
+ } else if ((written += n) == m->len) {
+ msg2genr.head = m->next;
+ if (!msg2genr.head)
+ msg2genr.tail = NULL;
+ free(m);
written = 0;
}
}
return 1;
}
-void send_msg(enum msgcode code, char *buf, int len)
+int send_msg(enum msgcode code, const char *buf, int len)
{
if (msg_fd_out < 0) {
- io_multiplex_write(code, buf, len);
- return;
+ if (!defer_forwarding_messages)
+ return io_multiplex_write(code, buf, len);
+ if (!io_multiplexing_out)
+ return 0;
+ msg_list_add(&msg2sndr, code, buf, len);
+ return 1;
}
- msg_list_add(code, buf, len);
- msg_list_flush(NORMAL_FLUSH);
+ msg_list_add(&msg2genr, code, buf, len);
+ msg2genr_flush(NORMAL_FLUSH);
+ return 1;
}
int get_redo_num(int itemizing, enum logcode code)
FD_ZERO(&r_fds);
FD_ZERO(&w_fds);
FD_SET(fd, &r_fds);
- if (msg_list.head) {
+ if (msg2genr.head) {
FD_SET(msg_fd_out, &w_fds);
if (msg_fd_out > maxfd)
maxfd = msg_fd_out;
continue;
}
- if (msg_list.head && FD_ISSET(msg_fd_out, &w_fds))
- msg_list_flush(NORMAL_FLUSH);
+ if (msg2genr.head && FD_ISSET(msg_fd_out, &w_fds))
+ msg2genr_flush(NORMAL_FLUSH);
if (io_filesfrom_f_out >= 0) {
if (io_filesfrom_buflen) {
if (cnt < 0 && (errno == EWOULDBLOCK
|| errno == EINTR || errno == EAGAIN)) {
struct timeval tv;
- fd_set fds;
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
+ fd_set r_fds, e_fds;
+ FD_ZERO(&r_fds);
+ FD_SET(fd, &r_fds);
+ FD_ZERO(&e_fds);
+ FD_SET(fd, &e_fds);
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
- if (!select(fd+1, &fds, NULL, NULL, &tv))
+ if (!select(fd+1, &r_fds, NULL, &e_fds, &tv))
check_timeout();
+ if (FD_ISSET(fd, &e_fds)) {
+ rsyserr(FINFO, errno,
+ "select exception on fd %d", fd);
+ }
continue;
}
if (cnt != 1)
return num;
}
-void read_buf(int f,char *buf,size_t len)
+void read_buf(int f, char *buf, size_t len)
{
readfd(f,buf,len);
}
-void read_sbuf(int f,char *buf,size_t len)
+void read_sbuf(int f, char *buf, size_t len)
{
readfd(f, buf, len);
buf[len] = '\0';
static void sleep_for_bwlimit(int bytes_written)
{
static struct timeval prior_tv;
- static long total_written = 0;
+ static long total_written = 0;
struct timeval tv, start_tv;
long elapsed_usec, sleep_usec;
if (!bwlimit_writemax)
return;
- total_written += bytes_written;
+ total_written += bytes_written;
gettimeofday(&start_tv, NULL);
if (prior_tv.tv_sec) {
*
* This function underlies the multiplexing system. The body of the
* application never calls this function directly. */
-static void writefd_unbuffered(int fd,char *buf,size_t len)
+static void writefd_unbuffered(int fd, const char *buf, size_t len)
{
size_t n, total = 0;
- fd_set w_fds, r_fds;
+ fd_set w_fds, r_fds, e_fds;
int maxfd, count, cnt, using_r_fds;
+ int defer_save = defer_forwarding_messages;
struct timeval tv;
no_flush++;
while (total < len) {
FD_ZERO(&w_fds);
- FD_SET(fd,&w_fds);
+ FD_SET(fd, &w_fds);
+ FD_ZERO(&e_fds);
+ FD_SET(fd, &e_fds);
maxfd = fd;
- if (msg_fd_in >= 0 && len-total >= contiguous_write_len) {
+ if (msg_fd_in >= 0) {
FD_ZERO(&r_fds);
- FD_SET(msg_fd_in,&r_fds);
+ FD_SET(msg_fd_in, &r_fds);
if (msg_fd_in > maxfd)
maxfd = msg_fd_in;
using_r_fds = 1;
errno = 0;
count = select(maxfd + 1, using_r_fds ? &r_fds : NULL,
- &w_fds, NULL, &tv);
+ &w_fds, &e_fds, &tv);
if (count <= 0) {
if (count < 0 && errno == EBADF)
continue;
}
+ if (FD_ISSET(fd, &e_fds)) {
+ rsyserr(FINFO, errno,
+ "select exception on fd %d", fd);
+ }
+
if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds))
read_msg_fd();
if (fd == sock_f_out)
close_multiplexing_out();
rsyserr(FERROR, errno,
- "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]",
- (long)len, io_write_phase, who_am_i());
+ "writefd_unbuffered failed to write %ld bytes [%s]",
+ (long)len, who_am_i());
/* If the other side is sending us error messages, try
* to grab any messages they sent before they died. */
while (fd == sock_f_out && io_multiplexing_in) {
}
total += cnt;
+ defer_forwarding_messages = 1;
if (fd == sock_f_out) {
if (io_timeout || am_generator)
}
}
+ defer_forwarding_messages = defer_save;
no_flush--;
}
+static void msg2sndr_flush(void)
+{
+ if (defer_forwarding_messages)
+ return;
+
+ while (msg2sndr.head && io_multiplexing_out) {
+ struct msg_list_item *m = msg2sndr.head;
+ if (!(msg2sndr.head = m->next))
+ msg2sndr.tail = NULL;
+ stats.total_written += m->len;
+ defer_forwarding_messages = 1;
+ writefd_unbuffered(sock_f_out, m->buf, m->len);
+ defer_forwarding_messages = 0;
+ free(m);
+ }
+}
+
/**
* Write an message to a multiplexed stream. If this fails then rsync
* exits.
**/
-static void mplex_write(enum msgcode code, char *buf, size_t len)
+static void mplex_write(enum msgcode code, const char *buf, size_t len)
{
char buffer[1024];
size_t n = len;
SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
- /* When the generator reads messages from the msg_fd_in pipe, it can
- * cause output to occur down the socket. Setting contiguous_write_len
- * prevents the reading of msg_fd_in once we actually start to write
- * this sequence of data (though we might read it before the start). */
- if (am_generator && msg_fd_in >= 0)
- contiguous_write_len = len + 4;
-
if (n > sizeof buffer - 4)
n = 0;
else
len -= n;
buf += n;
- if (len)
+ if (len) {
+ defer_forwarding_messages = 1;
writefd_unbuffered(sock_f_out, buf, len);
-
- if (am_generator && msg_fd_in >= 0)
- contiguous_write_len = 0;
+ defer_forwarding_messages = 0;
+ msg2sndr_flush();
+ }
}
void io_flush(int flush_it_all)
{
- msg_list_flush(flush_it_all);
+ msg2genr_flush(flush_it_all);
+ msg2sndr_flush();
if (!iobuf_out_cnt || no_flush)
return;
iobuf_out_cnt = 0;
}
-static void writefd(int fd,char *buf,size_t len)
+static void writefd(int fd, const char *buf, size_t len)
{
if (fd == msg_fd_out) {
rprintf(FERROR, "Internal error: wrong write used in receiver.\n");
writefd(f,b,4);
}
-void write_int_named(int f, int32 x, const char *phase)
-{
- io_write_phase = phase;
- write_int(f, x);
- io_write_phase = phase_unknown;
-}
-
/*
* Note: int64 may actually be a 32-bit type if ./configure couldn't find any
* 64-bit types on this platform.
#endif
}
-void write_buf(int f,char *buf,size_t len)
+void write_buf(int f, const char *buf, size_t len)
{
writefd(f,buf,len);
}
/** Write a string to the connection */
-void write_sbuf(int f, char *buf)
+void write_sbuf(int f, const char *buf)
{
writefd(f, buf, strlen(buf));
}
writefd(f, (char *)&c, 1);
}
-void write_vstring(int f, char *str, int len)
+void write_vstring(int f, const char *str, int len)
{
uchar lenbuf[3], *lb = lenbuf;
}
/** Write an message to the multiplexed data stream. */
-int io_multiplex_write(enum msgcode code, char *buf, size_t len)
+int io_multiplex_write(enum msgcode code, const char *buf, size_t len)
{
if (!io_multiplexing_out)
return 0;
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff