Copyright (C) 1996-2001 by Andrew Tridgell
Copyright (C) Paul Mackerras 1996
+ Copyright (C) 2001 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
/* if no timeout is specified then use a 60 second select timeout */
#define SELECT_TIMEOUT 60
-extern int bwlimit;
-
static int io_multiplexing_out;
static int io_multiplexing_in;
static int multiplex_in_fd;
static int multiplex_out_fd;
static time_t last_io;
-static int eof_error=1;
+static int no_flush;
+
+extern int bwlimit;
extern int verbose;
extern int io_timeout;
extern struct stats stats;
+
+/** Ignore EOF errors while reading a module listing if the remote
+ version is 24 or less. */
+int kludge_around_eof = False;
+
+
static int io_error_fd = -1;
static void read_loop(int fd, char *buf, int len);
}
-static int no_flush;
+static void whine_about_eof (void)
+{
+ /**
+ It's almost always an error to get an EOF when we're trying
+ to read from the network, because the protocol is
+ self-terminating.
+
+ However, there is one unfortunate cases where it is not,
+ which is rsync <2.4.6 sending a list of modules on a
+ server, since the list is terminated by closing the socket.
+ So, for the section of the program where that is a problem
+ (start_socket_client), kludge_around_eof is True and we
+ just exit.
+ */
+
+ if (kludge_around_eof)
+ exit_cleanup (0);
+ else {
+ rprintf (FERROR,
+ "%s: connection unexpectedly closed "
+ "(%.0f bytes read so far)\n",
+ RSYNC_NAME, (double)stats.total_read);
+
+ exit_cleanup (RERR_STREAMIO);
+ }
+}
-/*
+
+static void die_from_readerr (int err)
+{
+ /* this prevents us trying to write errors on a dead socket */
+ io_multiplexing_close();
+
+ rprintf(FERROR, "%s: read error: %s\n",
+ RSYNC_NAME, strerror (err));
+ exit_cleanup(RERR_STREAMIO);
+}
+
+
+/*!
* Read from a socket with IO timeout. return the number of bytes
* read. If no bytes can be read then exit, never return a number <= 0.
*
* give a better explanation. We can tell whether the connection has
* started by looking e.g. at whether the remote version is known yet.
*/
-static int read_timeout(int fd, char *buf, int len)
+static int read_timeout (int fd, char *buf, int len)
{
int n, ret=0;
io_flush();
while (ret == 0) {
+ /* until we manage to read *something* */
fd_set fds;
struct timeval tv;
int fd_count = fd+1;
if (io_timeout)
last_io = time(NULL);
continue;
+ } else if (n == 0) {
+ whine_about_eof ();
+ return -1; /* doesn't return */
+ } else if (n == -1) {
+ if (errno == EINTR || errno == EWOULDBLOCK ||
+ errno == EAGAIN)
+ continue;
+ else
+ die_from_readerr (errno);
}
-
- if (n == -1 && errno == EINTR) {
- continue;
- }
-
- if (n == -1 &&
- (errno == EWOULDBLOCK || errno == EAGAIN)) {
- continue;
- }
-
-
- if (n == 0) {
- if (eof_error) {
- rprintf(FERROR,
- "%s: connection to server unexpectedly closed"
- " (%.0f bytes read so far)\n",
- RSYNC_NAME, (double)stats.total_read);
- }
- exit_cleanup(RERR_STREAMIO);
- }
-
- /* this prevents us trying to write errors on a dead socket */
- io_multiplexing_close();
-
- rprintf(FERROR,"read error: %s\n", strerror(errno));
- exit_cleanup(RERR_STREAMIO);
}
return ret;
}
-/* continue trying to read len bytes - don't return until len
- has been read */
-static void read_loop(int fd, char *buf, int len)
+
+
+
+/*! Continue trying to read len bytes - don't return until len has
+ been read. */
+static void read_loop (int fd, char *buf, int len)
{
while (len) {
int n = read_timeout(fd, buf, len);
}
}
-/* read from the file descriptor handling multiplexing -
- return number of bytes read
- never return <= 0 */
+
+/**
+ * Read from the file descriptor handling multiplexing - return number
+ * of bytes read.
+ *
+ * Never returns <= 0.
+ */
static int read_unbuffered(int fd, char *buf, int len)
{
static int remaining;
int tag, ret=0;
char line[1024];
- if (!io_multiplexing_in || fd != multiplex_in_fd)
+ if (!io_multiplexing_in || fd != multiplex_in_fd)
return read_timeout(fd, buf, len);
while (ret == 0) {
continue;
}
- read_loop(fd, line, 4);
+ read_loop (fd, line, 4);
tag = IVAL(line, 0);
remaining = tag & 0xFFFFFF;
/* do a buffered read from fd. don't return until all N bytes
have been read. If all N can't be read then exit with an error */
-static void readfd(int fd,char *buffer,int N)
+static void readfd (int fd, char *buffer, int N)
{
int ret;
int total=0;
while (total < N) {
io_flush();
- ret = read_unbuffered(fd,buffer + total,N-total);
+ ret = read_unbuffered (fd, buffer + total, N-total);
total += ret;
}
void read_sbuf(int f,char *buf,int len)
{
- read_buf(f,buf,len);
+ read_buf (f,buf,len);
buf[len] = 0;
}
unsigned char read_byte(int f)
{
unsigned char c;
- read_buf(f,(char *)&c,1);
+ read_buf (f, (char *)&c, 1);
return c;
}
write_buf(f,(char *)&c,1);
}
+
+
int read_line(int f, char *buf, int maxlen)
{
- eof_error = 0;
-
while (maxlen) {
buf[0] = 0;
read_buf(f, buf, 1);
return 0;
}
- eof_error = 1;
-
return 1;
}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff