2 Copyright (C) Andrew Tridgell 1996
3 Copyright (C) Paul Mackerras 1996
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 Utilities used in rsync
27 static int io_multiplexing_out;
28 static int io_multiplexing_in;
29 static int multiplex_in_fd;
30 static int multiplex_out_fd;
31 static time_t last_io;
32 static int eof_error=1;
34 extern int io_timeout;
35 extern struct stats stats;
37 static int buffer_f_in = -1;
39 void setup_readbuffer(int f_in)
44 static void check_timeout(void)
48 if (!io_timeout) return;
57 if (last_io && io_timeout && (t-last_io)>io_timeout) {
58 rprintf(FERROR,"read timeout after %d second - exiting\n",
65 static char *read_buffer;
66 static char *read_buffer_p;
67 static int read_buffer_len;
68 static int read_buffer_size;
71 /* read from a socket with IO timeout. return the number of
72 bytes read. If no bytes can be read then exit, never return
74 static int read_timeout(int fd, char *buf, int len)
86 tv.tv_sec = io_timeout;
89 if (select(fd+1, &fds, NULL, NULL,
90 io_timeout?&tv:NULL) != 1) {
95 n = read(fd, buf, len);
98 stats.total_read += n;
103 last_io = time(NULL);
107 if (n == -1 && errno == EINTR) {
113 rprintf(FERROR,"EOF in read_timeout\n");
118 rprintf(FERROR,"read error: %s\n", strerror(errno));
125 /* continue trying to read len bytes - don't return until len
127 static void read_loop(int fd, char *buf, int len)
130 int n = read_timeout(fd, buf, len);
137 /* read from the file descriptor handling multiplexing -
138 return number of bytes read
140 static int read_unbuffered(int fd, char *buf, int len)
142 static int remaining;
147 if (!io_multiplexing_in || fd != multiplex_in_fd)
148 return read_timeout(fd, buf, len);
152 len = MIN(len, remaining);
153 read_loop(fd, buf, len);
159 read_loop(fd, ibuf, 4);
162 remaining = tag & 0xFFFFFF;
165 if (tag == MPLEX_BASE) continue;
169 if (tag != FERROR && tag != FINFO) {
170 rprintf(FERROR,"unexpected tag %d\n", tag);
174 if (remaining > sizeof(line)-1) {
175 rprintf(FERROR,"multiplexing overflow %d\n\n",
180 read_loop(fd, line, remaining);
183 rprintf(tag,"%s", line);
192 /* This function was added to overcome a deadlock problem when using
193 * ssh. It looks like we can't allow our receive queue to get full or
194 * ssh will clag up. Uggh. */
195 static void read_check(int f)
201 if (read_buffer_len == 0) {
202 read_buffer_p = read_buffer;
205 if (n > MAX_READ_BUFFER/4)
206 n = MAX_READ_BUFFER/4;
208 if (read_buffer_p != read_buffer) {
209 memmove(read_buffer,read_buffer_p,read_buffer_len);
210 read_buffer_p = read_buffer;
213 if (n > (read_buffer_size - read_buffer_len)) {
214 read_buffer_size += n;
215 read_buffer = (char *)Realloc(read_buffer,read_buffer_size);
216 if (!read_buffer) out_of_memory("read check");
217 read_buffer_p = read_buffer;
220 n = read_unbuffered(f,read_buffer+read_buffer_len,n);
221 read_buffer_len += n;
225 /* do a buffered read from fd. don't return until all N bytes
226 have been read. If all N can't be read then exit with an error */
227 static void readfd(int fd,char *buffer,int N)
232 if (read_buffer_len < N && N < 1024) {
233 read_check(buffer_f_in);
237 if (read_buffer_len > 0 && buffer_f_in == fd) {
238 ret = MIN(read_buffer_len,N-total);
239 memcpy(buffer+total,read_buffer_p,ret);
240 read_buffer_p += ret;
241 read_buffer_len -= ret;
248 ret = read_unbuffered(fd,buffer + total,N-total);
254 int32 read_int(int f)
261 int64 read_longint(int f)
263 extern int remote_version;
268 if ((int32)ret != (int32)0xffffffff) return ret;
271 rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
274 if (remote_version >= 16) {
276 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
283 void read_buf(int f,char *buf,int len)
288 void read_sbuf(int f,char *buf,int len)
294 unsigned char read_byte(int f)
297 read_buf(f,(char *)&c,1);
303 /* write len bytes to fd, possibly reading from buffer_f_in if set
304 in order to unclog the pipe. don't return until all len
305 bytes have been written */
306 static void writefd_unbuffered(int fd,char *buf,int len)
316 reading = (buffer_f_in != -1 && read_buffer_len < MAX_READ_BUFFER);
318 while (total < len) {
325 FD_SET(buffer_f_in,&r_fds);
326 if (buffer_f_in > fd)
327 fd_count = buffer_f_in+1;
330 tv.tv_sec = io_timeout;
333 count = select(fd_count,
336 io_timeout?&tv:NULL);
343 if (FD_ISSET(fd, &w_fds)) {
344 int ret = write(fd,buf+total,len-total);
346 if (ret == -1 && errno == EINTR) {
351 rprintf(FERROR,"erroring writing %d bytes - exiting\n", len);
356 stats.total_written += ret;
359 last_io = time(NULL);
363 if (reading && FD_ISSET(buffer_f_in, &r_fds)) {
364 read_check(buffer_f_in);
372 static char *io_buffer;
373 static int io_buffer_count;
375 void io_start_buffering(int fd)
377 if (io_buffer) return;
378 multiplex_out_fd = fd;
379 io_buffer = (char *)malloc(IO_BUFFER_SIZE+4);
380 if (!io_buffer) out_of_memory("writefd");
383 /* leave room for the multiplex header in case it's needed */
389 int fd = multiplex_out_fd;
390 if (!io_buffer_count || no_flush) return;
392 if (io_multiplexing_out) {
393 SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count);
394 writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4);
396 writefd_unbuffered(fd, io_buffer, io_buffer_count);
401 void io_end_buffering(int fd)
404 if (!io_multiplexing_out) {
410 static void writefd(int fd,char *buf,int len)
413 writefd_unbuffered(fd, buf, len);
418 int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count);
420 memcpy(io_buffer+io_buffer_count, buf, n);
423 io_buffer_count += n;
426 if (io_buffer_count == IO_BUFFER_SIZE) io_flush();
431 void write_int(int f,int32 x)
438 void write_longint(int f, int64 x)
440 extern int remote_version;
443 if (remote_version < 16 || x <= 0x7FFFFFFF) {
444 write_int(f, (int)x);
449 SIVAL(b,0,(x&0xFFFFFFFF));
450 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
455 void write_buf(int f,char *buf,int len)
460 /* write a string to the connection */
461 void write_sbuf(int f,char *buf)
463 write_buf(f, buf, strlen(buf));
467 void write_byte(int f,unsigned char c)
469 write_buf(f,(char *)&c,1);
472 int read_line(int f, char *buf, int maxlen)
479 if (buf[0] == 0) return 0;
480 if (buf[0] == '\n') {
484 if (buf[0] != '\r') {
500 void io_printf(int fd, const char *format, ...)
506 va_start(ap, format);
507 len = vslprintf(buf, sizeof(buf)-1, format, ap);
510 if (len < 0) exit_cleanup(1);
516 /* setup for multiplexing an error stream with the data stream */
517 void io_start_multiplex_out(int fd)
519 multiplex_out_fd = fd;
521 io_start_buffering(fd);
522 io_multiplexing_out = 1;
525 /* setup for multiplexing an error stream with the data stream */
526 void io_start_multiplex_in(int fd)
528 multiplex_in_fd = fd;
530 if (read_buffer_len) {
531 fprintf(stderr,"ERROR: data in read buffer at mplx start\n");
535 io_multiplexing_in = 1;
538 /* write an message to the error stream */
539 int io_multiplex_write(int f, char *buf, int len)
541 if (!io_multiplexing_out) return 0;
545 SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len);
546 memcpy(io_buffer, buf, len);
548 writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4);
552 void io_close_input(int fd)