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 /* if no timeout is specified then use a 60 second select timeout */
28 #define SELECT_TIMEOUT 60
30 static int io_multiplexing_out;
31 static int io_multiplexing_in;
32 static int multiplex_in_fd;
33 static int multiplex_out_fd;
34 static time_t last_io;
35 static int eof_error=1;
37 extern int io_timeout;
38 extern struct stats stats;
40 static int buffer_f_in = -1;
42 void setup_readbuffer(int f_in)
47 static void check_timeout(void)
51 if (!io_timeout) return;
60 if (last_io && io_timeout && (t-last_io) >= io_timeout) {
61 rprintf(FERROR,"io timeout after %d second - exiting\n",
68 static char *read_buffer;
69 static char *read_buffer_p;
70 static int read_buffer_len;
71 static int read_buffer_size;
73 static int no_flush_read;
75 /* read from a socket with IO timeout. return the number of
76 bytes read. If no bytes can be read then exit, never return
78 static int read_timeout(int fd, char *buf, int len)
92 tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
95 if (select(fd+1, &fds, NULL, NULL, &tv) != 1) {
100 n = read(fd, buf, len);
103 stats.total_read += n;
108 last_io = time(NULL);
112 if (n == -1 && errno == EINTR) {
117 (errno == EAGAIN || errno == EWOULDBLOCK)) {
118 /* this shouldn't happen, if it does then
119 sleep for a short time to prevent us
120 chewing too much CPU */
127 rprintf(FERROR,"unexpected EOF in read_timeout\n");
132 rprintf(FERROR,"read error: %s\n", strerror(errno));
139 /* continue trying to read len bytes - don't return until len
141 static void read_loop(int fd, char *buf, int len)
144 int n = read_timeout(fd, buf, len);
151 /* read from the file descriptor handling multiplexing -
152 return number of bytes read
154 static int read_unbuffered(int fd, char *buf, int len)
156 static int remaining;
161 if (!io_multiplexing_in || fd != multiplex_in_fd)
162 return read_timeout(fd, buf, len);
166 len = MIN(len, remaining);
167 read_loop(fd, buf, len);
173 read_loop(fd, ibuf, 4);
176 remaining = tag & 0xFFFFFF;
179 if (tag == MPLEX_BASE) continue;
183 if (tag != FERROR && tag != FINFO) {
184 rprintf(FERROR,"unexpected tag %d\n", tag);
188 if (remaining > sizeof(line)-1) {
189 rprintf(FERROR,"multiplexing overflow %d\n\n",
194 read_loop(fd, line, remaining);
197 rprintf(tag,"%s", line);
206 /* This function was added to overcome a deadlock problem when using
207 * ssh. It looks like we can't allow our receive queue to get full or
208 * ssh will clag up. Uggh. */
209 static void read_check(int f)
215 if (read_buffer_len == 0) {
216 read_buffer_p = read_buffer;
219 if (n > MAX_READ_BUFFER/4)
220 n = MAX_READ_BUFFER/4;
222 if (read_buffer_p != read_buffer) {
223 memmove(read_buffer,read_buffer_p,read_buffer_len);
224 read_buffer_p = read_buffer;
227 if (n > (read_buffer_size - read_buffer_len)) {
228 read_buffer_size += n;
229 read_buffer = (char *)Realloc(read_buffer,read_buffer_size);
230 if (!read_buffer) out_of_memory("read check");
231 read_buffer_p = read_buffer;
234 n = read_unbuffered(f,read_buffer+read_buffer_len,n);
235 read_buffer_len += n;
239 /* do a buffered read from fd. don't return until all N bytes
240 have been read. If all N can't be read then exit with an error */
241 static void readfd(int fd,char *buffer,int N)
246 if ((read_buffer_len < N) && (N < 1024)) {
247 read_check(buffer_f_in);
251 if (read_buffer_len > 0 && buffer_f_in == fd) {
252 ret = MIN(read_buffer_len,N-total);
253 memcpy(buffer+total,read_buffer_p,ret);
254 read_buffer_p += ret;
255 read_buffer_len -= ret;
264 ret = read_unbuffered(fd,buffer + total,N-total);
270 int32 read_int(int f)
277 int64 read_longint(int f)
279 extern int remote_version;
284 if ((int32)ret != (int32)0xffffffff) return ret;
287 rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
290 if (remote_version >= 16) {
292 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
299 void read_buf(int f,char *buf,int len)
304 void read_sbuf(int f,char *buf,int len)
310 unsigned char read_byte(int f)
313 read_buf(f,(char *)&c,1);
319 /* write len bytes to fd, possibly reading from buffer_f_in if set
320 in order to unclog the pipe. don't return until all len
321 bytes have been written */
322 static void writefd_unbuffered(int fd,char *buf,int len)
333 while (total < len) {
339 if (!no_flush_read) {
340 reading = (buffer_f_in != -1);
344 FD_SET(buffer_f_in,&r_fds);
345 if (buffer_f_in > fd)
346 fd_count = buffer_f_in+1;
349 tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
352 count = select(fd_count,
362 if (reading && FD_ISSET(buffer_f_in, &r_fds)) {
363 read_check(buffer_f_in);
366 if (FD_ISSET(fd, &w_fds)) {
367 int n = (len-total)>>blocked;
368 int ret = write(fd,buf+total,n?n:1);
370 if (ret == -1 && errno == EINTR) {
375 (errno == EAGAIN || errno == EWOULDBLOCK)) {
381 rprintf(FERROR,"erroring writing %d bytes - exiting\n", len);
387 stats.total_written += ret;
390 last_io = time(NULL);
398 static char *io_buffer;
399 static int io_buffer_count;
401 void io_start_buffering(int fd)
403 if (io_buffer) return;
404 multiplex_out_fd = fd;
405 io_buffer = (char *)malloc(IO_BUFFER_SIZE+4);
406 if (!io_buffer) out_of_memory("writefd");
409 /* leave room for the multiplex header in case it's needed */
415 int fd = multiplex_out_fd;
416 if (!io_buffer_count || no_flush) return;
418 if (io_multiplexing_out) {
419 SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count);
420 writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4);
422 writefd_unbuffered(fd, io_buffer, io_buffer_count);
427 void io_end_buffering(int fd)
430 if (!io_multiplexing_out) {
436 static void writefd(int fd,char *buf,int len)
439 writefd_unbuffered(fd, buf, len);
444 int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count);
446 memcpy(io_buffer+io_buffer_count, buf, n);
449 io_buffer_count += n;
452 if (io_buffer_count == IO_BUFFER_SIZE) io_flush();
457 void write_int(int f,int32 x)
464 void write_longint(int f, int64 x)
466 extern int remote_version;
469 if (remote_version < 16 || x <= 0x7FFFFFFF) {
470 write_int(f, (int)x);
475 SIVAL(b,0,(x&0xFFFFFFFF));
476 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
481 void write_buf(int f,char *buf,int len)
486 /* write a string to the connection */
487 static void write_sbuf(int f,char *buf)
489 write_buf(f, buf, strlen(buf));
493 void write_byte(int f,unsigned char c)
495 write_buf(f,(char *)&c,1);
498 int read_line(int f, char *buf, int maxlen)
505 if (buf[0] == 0) return 0;
506 if (buf[0] == '\n') {
510 if (buf[0] != '\r') {
526 void io_printf(int fd, const char *format, ...)
532 va_start(ap, format);
533 len = vslprintf(buf, sizeof(buf)-1, format, ap);
536 if (len < 0) exit_cleanup(1);
542 /* setup for multiplexing an error stream with the data stream */
543 void io_start_multiplex_out(int fd)
545 multiplex_out_fd = fd;
547 io_start_buffering(fd);
548 io_multiplexing_out = 1;
551 /* setup for multiplexing an error stream with the data stream */
552 void io_start_multiplex_in(int fd)
554 multiplex_in_fd = fd;
556 if (read_buffer_len) {
557 fprintf(stderr,"ERROR: data in read buffer at mplx start\n");
561 io_multiplexing_in = 1;
564 /* write an message to the error stream */
565 int io_multiplex_write(int f, char *buf, int len)
567 if (!io_multiplexing_out) return 0;
571 SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len);
572 memcpy(io_buffer, buf, len);
574 writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4);
578 void io_close_input(int fd)