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 int64 total_written;
28 static int64 total_read;
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;
40 int64 write_total(void)
45 int64 read_total(void)
50 static int buffer_f_in = -1;
52 void setup_readbuffer(int f_in)
57 static void check_timeout(void)
61 if (!io_timeout) return;
70 if (last_io && io_timeout && (t-last_io)>io_timeout) {
71 rprintf(FERROR,"read timeout after %d second - exiting\n",
78 static char *read_buffer;
79 static char *read_buffer_p;
80 static int read_buffer_len;
81 static int read_buffer_size;
84 /* read from a socket with IO timeout. return the number of
85 bytes read. If no bytes can be read then exit, never return
87 static int read_timeout(int fd, char *buf, int len)
99 tv.tv_sec = io_timeout;
102 if (select(fd+1, &fds, NULL, NULL,
103 io_timeout?&tv:NULL) != 1) {
108 n = read(fd, buf, len);
115 last_io = time(NULL);
119 if (n == -1 && errno == EINTR) {
125 rprintf(FERROR,"EOF in read_timeout\n");
130 rprintf(FERROR,"read error: %s\n", strerror(errno));
137 /* continue trying to read len bytes - don't return until len
139 static void read_loop(int fd, char *buf, int len)
142 int n = read_timeout(fd, buf, len);
149 /* read from the file descriptor handling multiplexing -
150 return number of bytes read
152 static int read_unbuffered(int fd, char *buf, int len)
154 static int remaining;
159 if (!io_multiplexing_in || fd != multiplex_in_fd)
160 return read_timeout(fd, buf, len);
164 len = MIN(len, remaining);
165 read_loop(fd, buf, len);
171 read_loop(fd, ibuf, 4);
174 remaining = tag & 0xFFFFFF;
177 if (tag == MPLEX_BASE) continue;
181 if (tag != FERROR && tag != FINFO) {
182 rprintf(FERROR,"unexpected tag %d\n", tag);
186 if (remaining > sizeof(line)-1) {
187 rprintf(FERROR,"multiplexing overflow %d\n\n",
192 read_loop(fd, line, remaining);
195 rprintf(tag,"%s", line);
204 /* This function was added to overcome a deadlock problem when using
205 * ssh. It looks like we can't allow our receive queue to get full or
206 * ssh will clag up. Uggh. */
207 static void read_check(int f)
213 if (read_buffer_len == 0) {
214 read_buffer_p = read_buffer;
217 if (n > MAX_READ_BUFFER/4)
218 n = MAX_READ_BUFFER/4;
220 if (read_buffer_p != read_buffer) {
221 memmove(read_buffer,read_buffer_p,read_buffer_len);
222 read_buffer_p = read_buffer;
225 if (n > (read_buffer_size - read_buffer_len)) {
226 read_buffer_size += n;
227 read_buffer = (char *)Realloc(read_buffer,read_buffer_size);
228 if (!read_buffer) out_of_memory("read check");
229 read_buffer_p = read_buffer;
232 n = read_unbuffered(f,read_buffer+read_buffer_len,n);
233 read_buffer_len += n;
237 /* do a buffered read from fd. don't return until all N bytes
238 have been read. If all N can't be read then exit with an error */
239 static void readfd(int fd,char *buffer,int N)
244 if (read_buffer_len < N && N < 1024) {
245 read_check(buffer_f_in);
249 if (read_buffer_len > 0 && buffer_f_in == fd) {
250 ret = MIN(read_buffer_len,N-total);
251 memcpy(buffer+total,read_buffer_p,ret);
252 read_buffer_p += ret;
253 read_buffer_len -= ret;
260 ret = read_unbuffered(fd,buffer + total,N-total);
266 int32 read_int(int f)
274 int64 read_longint(int f)
276 extern int remote_version;
281 if ((int32)ret != (int32)0xffffffff) return ret;
284 rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
287 if (remote_version >= 16) {
290 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
297 void read_buf(int f,char *buf,int len)
303 void read_sbuf(int f,char *buf,int len)
309 unsigned char read_byte(int f)
312 read_buf(f,(char *)&c,1);
318 /* write len bytes to fd, possibly reading from buffer_f_in if set
319 in order to unclog the pipe. don't return until all len
320 bytes have been written */
321 static void writefd_unbuffered(int fd,char *buf,int len)
331 reading = (buffer_f_in != -1 && read_buffer_len < MAX_READ_BUFFER);
333 while (total < len) {
340 FD_SET(buffer_f_in,&r_fds);
341 if (buffer_f_in > fd)
342 fd_count = buffer_f_in+1;
345 tv.tv_sec = io_timeout;
348 count = select(fd_count,
351 io_timeout?&tv:NULL);
358 if (FD_ISSET(fd, &w_fds)) {
359 int ret = write(fd,buf+total,len-total);
361 if (ret == -1 && errno == EINTR) {
366 rprintf(FERROR,"erroring writing %d bytes - exiting\n", len);
372 last_io = time(NULL);
376 if (reading && FD_ISSET(buffer_f_in, &r_fds)) {
377 read_check(buffer_f_in);
385 static char *io_buffer;
386 static int io_buffer_count;
388 void io_start_buffering(int fd)
390 if (io_buffer) return;
391 multiplex_out_fd = fd;
392 io_buffer = (char *)malloc(IO_BUFFER_SIZE+4);
393 if (!io_buffer) out_of_memory("writefd");
396 /* leave room for the multiplex header in case it's needed */
402 int fd = multiplex_out_fd;
403 if (!io_buffer_count || no_flush) return;
405 if (io_multiplexing_out) {
406 SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count);
407 writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4);
409 writefd_unbuffered(fd, io_buffer, io_buffer_count);
414 void io_end_buffering(int fd)
417 if (!io_multiplexing_out) {
423 static void writefd(int fd,char *buf,int len)
426 writefd_unbuffered(fd, buf, len);
431 int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count);
433 memcpy(io_buffer+io_buffer_count, buf, n);
436 io_buffer_count += n;
439 if (io_buffer_count == IO_BUFFER_SIZE) io_flush();
444 void write_int(int f,int32 x)
452 void write_longint(int f, int64 x)
454 extern int remote_version;
457 if (remote_version < 16 || x <= 0x7FFFFFFF) {
458 write_int(f, (int)x);
463 SIVAL(b,0,(x&0xFFFFFFFF));
464 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
470 void write_buf(int f,char *buf,int len)
473 total_written += len;
476 /* write a string to the connection */
477 void write_sbuf(int f,char *buf)
479 write_buf(f, buf, strlen(buf));
483 void write_byte(int f,unsigned char c)
485 write_buf(f,(char *)&c,1);
488 int read_line(int f, char *buf, int maxlen)
495 if (buf[0] == 0) return 0;
496 if (buf[0] == '\n') {
500 if (buf[0] != '\r') {
516 void io_printf(int fd, const char *format, ...)
522 va_start(ap, format);
523 len = vslprintf(buf, sizeof(buf)-1, format, ap);
526 if (len < 0) exit_cleanup(1);
532 /* setup for multiplexing an error stream with the data stream */
533 void io_start_multiplex_out(int fd)
535 multiplex_out_fd = fd;
537 io_start_buffering(fd);
538 io_multiplexing_out = 1;
541 /* setup for multiplexing an error stream with the data stream */
542 void io_start_multiplex_in(int fd)
544 multiplex_in_fd = fd;
546 if (read_buffer_len) {
547 fprintf(stderr,"ERROR: data in read buffer at mplx start\n");
551 io_multiplexing_in = 1;
554 /* write an message to the error stream */
555 int io_multiplex_write(int f, char *buf, int len)
557 if (!io_multiplexing_out) return 0;
561 SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len);
562 memcpy(io_buffer, buf, len);
564 writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4);
568 void io_close_input(int fd)