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,"io 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) {
112 (errno == EAGAIN || errno == EWOULDBLOCK)) {
113 /* this shouldn't happen, if it does then
114 sleep for a short time to prevent us
115 chewing too much CPU */
122 rprintf(FERROR,"unexpected EOF in read_timeout\n");
127 rprintf(FERROR,"read error: %s\n", strerror(errno));
134 /* continue trying to read len bytes - don't return until len
136 static void read_loop(int fd, char *buf, int len)
139 int n = read_timeout(fd, buf, len);
146 /* read from the file descriptor handling multiplexing -
147 return number of bytes read
149 static int read_unbuffered(int fd, char *buf, int len)
151 static int remaining;
156 if (!io_multiplexing_in || fd != multiplex_in_fd)
157 return read_timeout(fd, buf, len);
161 len = MIN(len, remaining);
162 read_loop(fd, buf, len);
168 read_loop(fd, ibuf, 4);
171 remaining = tag & 0xFFFFFF;
174 if (tag == MPLEX_BASE) continue;
178 if (tag != FERROR && tag != FINFO) {
179 rprintf(FERROR,"unexpected tag %d\n", tag);
183 if (remaining > sizeof(line)-1) {
184 rprintf(FERROR,"multiplexing overflow %d\n\n",
189 read_loop(fd, line, remaining);
192 rprintf(tag,"%s", line);
201 /* This function was added to overcome a deadlock problem when using
202 * ssh. It looks like we can't allow our receive queue to get full or
203 * ssh will clag up. Uggh. */
204 static void read_check(int f)
210 if (read_buffer_len == 0) {
211 read_buffer_p = read_buffer;
214 if (n > MAX_READ_BUFFER/4)
215 n = MAX_READ_BUFFER/4;
217 if (read_buffer_p != read_buffer) {
218 memmove(read_buffer,read_buffer_p,read_buffer_len);
219 read_buffer_p = read_buffer;
222 if (n > (read_buffer_size - read_buffer_len)) {
223 read_buffer_size += n;
224 read_buffer = (char *)Realloc(read_buffer,read_buffer_size);
225 if (!read_buffer) out_of_memory("read check");
226 read_buffer_p = read_buffer;
229 n = read_unbuffered(f,read_buffer+read_buffer_len,n);
230 read_buffer_len += n;
234 /* do a buffered read from fd. don't return until all N bytes
235 have been read. If all N can't be read then exit with an error */
236 static void readfd(int fd,char *buffer,int N)
241 if ((read_buffer_len < N) && (N < 1024)) {
242 read_check(buffer_f_in);
246 if (read_buffer_len > 0 && buffer_f_in == fd) {
247 ret = MIN(read_buffer_len,N-total);
248 memcpy(buffer+total,read_buffer_p,ret);
249 read_buffer_p += ret;
250 read_buffer_len -= ret;
257 ret = read_unbuffered(fd,buffer + total,N-total);
263 int32 read_int(int f)
270 int64 read_longint(int f)
272 extern int remote_version;
277 if ((int32)ret != (int32)0xffffffff) return ret;
280 rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
283 if (remote_version >= 16) {
285 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
292 void read_buf(int f,char *buf,int len)
297 void read_sbuf(int f,char *buf,int len)
303 unsigned char read_byte(int f)
306 read_buf(f,(char *)&c,1);
312 /* write len bytes to fd, possibly reading from buffer_f_in if set
313 in order to unclog the pipe. don't return until all len
314 bytes have been written */
315 static void writefd_unbuffered(int fd,char *buf,int len)
326 while (total < len) {
332 reading = (buffer_f_in != -1 &&
333 read_buffer_len < MAX_READ_BUFFER);
336 FD_SET(buffer_f_in,&r_fds);
337 if (buffer_f_in > fd)
338 fd_count = buffer_f_in+1;
341 tv.tv_sec = io_timeout;
344 count = select(fd_count,
347 io_timeout?&tv:NULL);
354 if (reading && FD_ISSET(buffer_f_in, &r_fds)) {
355 read_check(buffer_f_in);
358 if (FD_ISSET(fd, &w_fds)) {
359 int n = (len-total)>>blocked;
360 int ret = write(fd,buf+total,n?n:1);
362 if (ret == -1 && errno == EINTR) {
367 (errno == EAGAIN || errno == EWOULDBLOCK)) {
373 rprintf(FERROR,"erroring writing %d bytes - exiting\n", len);
379 stats.total_written += ret;
382 last_io = time(NULL);
390 static char *io_buffer;
391 static int io_buffer_count;
393 void io_start_buffering(int fd)
395 if (io_buffer) return;
396 multiplex_out_fd = fd;
397 io_buffer = (char *)malloc(IO_BUFFER_SIZE+4);
398 if (!io_buffer) out_of_memory("writefd");
401 /* leave room for the multiplex header in case it's needed */
407 int fd = multiplex_out_fd;
408 if (!io_buffer_count || no_flush) return;
410 if (io_multiplexing_out) {
411 SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count);
412 writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4);
414 writefd_unbuffered(fd, io_buffer, io_buffer_count);
419 void io_end_buffering(int fd)
422 if (!io_multiplexing_out) {
428 static void writefd(int fd,char *buf,int len)
431 writefd_unbuffered(fd, buf, len);
436 int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count);
438 memcpy(io_buffer+io_buffer_count, buf, n);
441 io_buffer_count += n;
444 if (io_buffer_count == IO_BUFFER_SIZE) io_flush();
449 void write_int(int f,int32 x)
456 void write_longint(int f, int64 x)
458 extern int remote_version;
461 if (remote_version < 16 || x <= 0x7FFFFFFF) {
462 write_int(f, (int)x);
467 SIVAL(b,0,(x&0xFFFFFFFF));
468 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
473 void write_buf(int f,char *buf,int len)
478 /* write a string to the connection */
479 void write_sbuf(int f,char *buf)
481 write_buf(f, buf, strlen(buf));
485 void write_byte(int f,unsigned char c)
487 write_buf(f,(char *)&c,1);
490 int read_line(int f, char *buf, int maxlen)
497 if (buf[0] == 0) return 0;
498 if (buf[0] == '\n') {
502 if (buf[0] != '\r') {
518 void io_printf(int fd, const char *format, ...)
524 va_start(ap, format);
525 len = vslprintf(buf, sizeof(buf)-1, format, ap);
528 if (len < 0) exit_cleanup(1);
534 /* setup for multiplexing an error stream with the data stream */
535 void io_start_multiplex_out(int fd)
537 multiplex_out_fd = fd;
539 io_start_buffering(fd);
540 io_multiplexing_out = 1;
543 /* setup for multiplexing an error stream with the data stream */
544 void io_start_multiplex_in(int fd)
546 multiplex_in_fd = fd;
548 if (read_buffer_len) {
549 fprintf(stderr,"ERROR: data in read buffer at mplx start\n");
553 io_multiplexing_in = 1;
556 /* write an message to the error stream */
557 int io_multiplex_write(int f, char *buf, int len)
559 if (!io_multiplexing_out) return 0;
563 SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len);
564 memcpy(io_buffer, buf, len);
566 writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4);
570 void io_close_input(int fd)