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;
31 extern int sparse_files;
32 extern int io_timeout;
34 int64 write_total(void)
39 int64 read_total(void)
44 static int buffer_f_in = -1;
46 void setup_nonblocking(int f_in,int f_out)
48 set_blocking(f_out,0);
53 static char *read_buffer;
54 static char *read_buffer_p;
55 static int read_buffer_len;
56 static int read_buffer_size;
59 /* This function was added to overcome a deadlock problem when using
60 * ssh. It looks like we can't allow our receive queue to get full or
61 * ssh will clag up. Uggh. */
62 static void read_check(int f)
68 if (read_buffer_len == 0) {
69 read_buffer_p = read_buffer;
72 if ((n=num_waiting(f)) <= 0)
75 /* things could deteriorate if we read in really small chunks */
78 if (read_buffer_p != read_buffer) {
79 memmove(read_buffer,read_buffer_p,read_buffer_len);
80 read_buffer_p = read_buffer;
83 if (n > (read_buffer_size - read_buffer_len)) {
84 read_buffer_size += n;
86 read_buffer = (char *)malloc(read_buffer_size);
88 read_buffer = (char *)realloc(read_buffer,read_buffer_size);
89 if (!read_buffer) out_of_memory("read check");
90 read_buffer_p = read_buffer;
93 n = read(f,read_buffer+read_buffer_len,n);
99 static time_t last_io;
102 static void check_timeout(void)
106 if (!io_timeout) return;
109 last_io = time(NULL);
115 if (last_io && io_timeout && (t-last_io)>io_timeout) {
116 rprintf(FERROR,"read timeout after %d second - exiting\n",
122 static int readfd(int fd,char *buffer,int N)
128 if (read_buffer_len < N)
129 read_check(buffer_f_in);
132 if (read_buffer_len > 0 && buffer_f_in == fd) {
133 ret = MIN(read_buffer_len,N-total);
134 memcpy(buffer+total,read_buffer_p,ret);
135 read_buffer_p += ret;
136 read_buffer_len -= ret;
141 while ((ret = read(fd,buffer + total,N-total)) == -1) {
144 if (errno != EAGAIN && errno != EWOULDBLOCK)
148 tv.tv_sec = io_timeout;
151 if (select(fd+1, &fds, NULL, NULL,
152 io_timeout?&tv:NULL) != 1) {
163 last_io = time(NULL);
168 int32 read_int(int f)
172 if ((ret=readfd(f,b,4)) != 4) {
174 rprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
175 getpid(),4,ret==-1?strerror(errno):"EOF");
182 int64 read_longint(int f)
184 extern int remote_version;
189 if ((int32)ret != (int32)0xffffffff) return ret;
192 rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
195 if (remote_version >= 16) {
196 if ((ret=readfd(f,b,8)) != 8) {
198 rprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
199 getpid(),8,ret==-1?strerror(errno):"EOF");
203 ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
210 void read_buf(int f,char *buf,int len)
213 if ((ret=readfd(f,buf,len)) != len) {
215 rprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
216 getpid(),len,ret==-1?strerror(errno):"EOF");
222 void read_sbuf(int f,char *buf,int len)
228 unsigned char read_byte(int f)
231 read_buf(f,(char *)&c,1);
236 static char last_byte;
237 static int last_sparse;
239 int sparse_end(int f)
242 do_lseek(f,-1,SEEK_CUR);
243 return (write(f,&last_byte,1) == 1 ? 0 : -1);
250 static int write_sparse(int f,char *buf,int len)
255 for (l1=0;l1<len && buf[l1]==0;l1++) ;
256 for (l2=0;l2<(len-l1) && buf[len-(l2+1)]==0;l2++) ;
258 last_byte = buf[len-1];
260 if (l1 == len || l2 > 0)
264 do_lseek(f,l1,SEEK_CUR);
269 if ((ret=write(f,buf+l1,len-(l1+l2))) != len-(l1+l2)) {
270 if (ret == -1 || ret == 0) return ret;
275 do_lseek(f,l2,SEEK_CUR);
282 int write_file(int f,char *buf,int len)
287 return write(f,buf,len);
290 int len1 = MIN(len, SPARSE_WRITE_SIZE);
291 int r1 = write_sparse(f, buf, len1);
293 if (ret > 0) return ret;
304 static int writefd(int fd,char *buf,int len)
308 int fd_count, count, got_select=0;
311 if (buffer_f_in == -1)
312 return write(fd,buf,len);
314 while (total < len) {
315 int ret = write(fd,buf+total,len-total);
317 if (ret == 0) return total;
319 if (ret == -1 && !(errno == EWOULDBLOCK || errno == EAGAIN))
322 if (ret == -1 && got_select) {
323 /* hmmm, we got a write select on the fd and then failed to write.
324 Why doesn't that mean that the fd is dead? It doesn't on some
325 systems it seems (eg. IRIX) */
328 rprintf(FERROR,"write exception\n");
337 read_check(buffer_f_in);
343 if (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 = BLOCKING_TIMEOUT;
351 count = select(fd_count,buffer_f_in == -1? NULL: &r_fds,
353 if (count == -1 && errno != EINTR) {
355 rprintf(FERROR,"select error: %s\n", strerror(errno));
364 if (FD_ISSET(fd, &w_fds)) {
373 last_io = time(NULL);
380 void write_int(int f,int32 x)
385 if ((ret=writefd(f,b,4)) != 4) {
386 rprintf(FERROR,"write_int failed : %s\n",
387 ret==-1?strerror(errno):"EOF");
393 void write_longint(int f, int64 x)
395 extern int remote_version;
399 if (remote_version < 16 || x <= 0x7FFFFFFF) {
400 write_int(f, (int)x);
405 SIVAL(b,0,(x&0xFFFFFFFF));
406 SIVAL(b,4,((x>>32)&0xFFFFFFFF));
408 if ((ret=writefd(f,b,8)) != 8) {
409 rprintf(FERROR,"write_longint failed : %s\n",
410 ret==-1?strerror(errno):"EOF");
416 void write_buf(int f,char *buf,int len)
419 if ((ret=writefd(f,buf,len)) != len) {
420 rprintf(FERROR,"write_buf failed : %s\n",
421 ret==-1?strerror(errno):"EOF");
424 total_written += len;
427 /* write a string to the connection */
428 void write_sbuf(int f,char *buf)
430 write_buf(f, buf, strlen(buf));
434 void write_byte(int f,unsigned char c)
436 write_buf(f,(char *)&c,1);
439 void write_flush(int f)
444 int read_line(int f, char *buf, int maxlen)
448 if (buf[0] == '\n') {
452 if (buf[0] != '\r') {
465 void io_printf(int fd, const char *format, ...)
471 va_start(ap, format);
474 len = vsnprintf(buf, sizeof(buf)-1, format, ap);
476 vsprintf(buf, format, ap);
481 if (len < 0) exit_cleanup(1);