| 1 | /* |
| 2 | Copyright (C) Andrew Tridgell 1996 |
| 3 | Copyright (C) Paul Mackerras 1996 |
| 4 | |
| 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. |
| 9 | |
| 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. |
| 14 | |
| 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. |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | Utilities used in rsync |
| 22 | |
| 23 | tridge, June 1996 |
| 24 | */ |
| 25 | #include "rsync.h" |
| 26 | |
| 27 | static int64 total_written; |
| 28 | static int64 total_read; |
| 29 | |
| 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 | |
| 36 | extern int verbose; |
| 37 | extern int sparse_files; |
| 38 | extern int io_timeout; |
| 39 | |
| 40 | int64 write_total(void) |
| 41 | { |
| 42 | return total_written; |
| 43 | } |
| 44 | |
| 45 | int64 read_total(void) |
| 46 | { |
| 47 | return total_read; |
| 48 | } |
| 49 | |
| 50 | static int buffer_f_in = -1; |
| 51 | |
| 52 | void setup_nonblocking(int f_in,int f_out) |
| 53 | { |
| 54 | set_blocking(f_out,0); |
| 55 | buffer_f_in = f_in; |
| 56 | } |
| 57 | |
| 58 | static void check_timeout(void) |
| 59 | { |
| 60 | time_t t; |
| 61 | |
| 62 | if (!io_timeout) return; |
| 63 | |
| 64 | if (!last_io) { |
| 65 | last_io = time(NULL); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | t = time(NULL); |
| 70 | |
| 71 | if (last_io && io_timeout && (t-last_io)>io_timeout) { |
| 72 | rprintf(FERROR,"read timeout after %d second - exiting\n", |
| 73 | (int)(t-last_io)); |
| 74 | exit_cleanup(1); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | |
| 79 | static char *read_buffer; |
| 80 | static char *read_buffer_p; |
| 81 | static int read_buffer_len; |
| 82 | static int read_buffer_size; |
| 83 | |
| 84 | |
| 85 | /* continue trying to read len bytes - don't return until len |
| 86 | has been read */ |
| 87 | static void read_loop(int fd, char *buf, int len) |
| 88 | { |
| 89 | while (len) { |
| 90 | int n = read(fd, buf, len); |
| 91 | if (n > 0) { |
| 92 | buf += n; |
| 93 | len -= n; |
| 94 | } |
| 95 | if (n == 0) { |
| 96 | rprintf(FERROR,"EOF in read_loop\n"); |
| 97 | exit_cleanup(1); |
| 98 | } |
| 99 | if (n == -1) { |
| 100 | fd_set fds; |
| 101 | struct timeval tv; |
| 102 | |
| 103 | if (errno != EAGAIN && errno != EWOULDBLOCK) { |
| 104 | rprintf(FERROR,"io error: %s\n", |
| 105 | strerror(errno)); |
| 106 | exit_cleanup(1); |
| 107 | } |
| 108 | |
| 109 | FD_ZERO(&fds); |
| 110 | FD_SET(fd, &fds); |
| 111 | tv.tv_sec = io_timeout; |
| 112 | tv.tv_usec = 0; |
| 113 | |
| 114 | if (select(fd+1, &fds, NULL, NULL, |
| 115 | io_timeout?&tv:NULL) != 1) { |
| 116 | check_timeout(); |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static int read_unbuffered(int fd, char *buf, int len) |
| 123 | { |
| 124 | static int remaining; |
| 125 | char ibuf[4]; |
| 126 | int tag, ret=0; |
| 127 | char line[1024]; |
| 128 | |
| 129 | if (!io_multiplexing_in || fd != multiplex_in_fd) |
| 130 | return read(fd, buf, len); |
| 131 | |
| 132 | while (ret == 0) { |
| 133 | if (remaining) { |
| 134 | len = MIN(len, remaining); |
| 135 | read_loop(fd, buf, len); |
| 136 | remaining -= len; |
| 137 | ret = len; |
| 138 | continue; |
| 139 | } |
| 140 | |
| 141 | read_loop(fd, ibuf, 4); |
| 142 | tag = IVAL(ibuf, 0); |
| 143 | |
| 144 | remaining = tag & 0xFFFFFF; |
| 145 | tag = tag >> 24; |
| 146 | |
| 147 | if (tag == MPLEX_BASE) continue; |
| 148 | |
| 149 | tag -= MPLEX_BASE; |
| 150 | |
| 151 | if (tag != FERROR && tag != FINFO) { |
| 152 | rprintf(FERROR,"unexpected tag %d\n", tag); |
| 153 | exit_cleanup(1); |
| 154 | } |
| 155 | |
| 156 | if (remaining > sizeof(line)-1) { |
| 157 | rprintf(FERROR,"multiplexing overflow %d\n\n", |
| 158 | remaining); |
| 159 | exit_cleanup(1); |
| 160 | } |
| 161 | |
| 162 | read_loop(fd, line, remaining); |
| 163 | line[remaining] = 0; |
| 164 | |
| 165 | rprintf(tag,"%s", line); |
| 166 | remaining = 0; |
| 167 | } |
| 168 | |
| 169 | return ret; |
| 170 | } |
| 171 | |
| 172 | |
| 173 | /* This function was added to overcome a deadlock problem when using |
| 174 | * ssh. It looks like we can't allow our receive queue to get full or |
| 175 | * ssh will clag up. Uggh. */ |
| 176 | static void read_check(int f) |
| 177 | { |
| 178 | int n; |
| 179 | |
| 180 | if (f == -1) return; |
| 181 | |
| 182 | if (read_buffer_len == 0) { |
| 183 | read_buffer_p = read_buffer; |
| 184 | } |
| 185 | |
| 186 | if ((n=num_waiting(f)) <= 0) |
| 187 | return; |
| 188 | |
| 189 | /* things could deteriorate if we read in really small chunks */ |
| 190 | if (n < 10) n = 1024; |
| 191 | |
| 192 | if (n > MAX_READ_BUFFER/4) |
| 193 | n = MAX_READ_BUFFER/4; |
| 194 | |
| 195 | if (read_buffer_p != read_buffer) { |
| 196 | memmove(read_buffer,read_buffer_p,read_buffer_len); |
| 197 | read_buffer_p = read_buffer; |
| 198 | } |
| 199 | |
| 200 | if (n > (read_buffer_size - read_buffer_len)) { |
| 201 | read_buffer_size += n; |
| 202 | if (!read_buffer) |
| 203 | read_buffer = (char *)malloc(read_buffer_size); |
| 204 | else |
| 205 | read_buffer = (char *)realloc(read_buffer,read_buffer_size); |
| 206 | if (!read_buffer) out_of_memory("read check"); |
| 207 | read_buffer_p = read_buffer; |
| 208 | } |
| 209 | |
| 210 | n = read_unbuffered(f,read_buffer+read_buffer_len,n); |
| 211 | if (n > 0) { |
| 212 | read_buffer_len += n; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | static int readfd(int fd,char *buffer,int N) |
| 217 | { |
| 218 | int ret; |
| 219 | int total=0; |
| 220 | struct timeval tv; |
| 221 | |
| 222 | if (read_buffer_len < N) |
| 223 | read_check(buffer_f_in); |
| 224 | |
| 225 | while (total < N) { |
| 226 | if (read_buffer_len > 0 && buffer_f_in == fd) { |
| 227 | ret = MIN(read_buffer_len,N-total); |
| 228 | memcpy(buffer+total,read_buffer_p,ret); |
| 229 | read_buffer_p += ret; |
| 230 | read_buffer_len -= ret; |
| 231 | total += ret; |
| 232 | continue; |
| 233 | } |
| 234 | |
| 235 | io_flush(); |
| 236 | |
| 237 | while ((ret = read_unbuffered(fd,buffer + total,N-total)) == -1) { |
| 238 | fd_set fds; |
| 239 | |
| 240 | if (errno != EAGAIN && errno != EWOULDBLOCK) |
| 241 | return -1; |
| 242 | FD_ZERO(&fds); |
| 243 | FD_SET(fd, &fds); |
| 244 | tv.tv_sec = io_timeout; |
| 245 | tv.tv_usec = 0; |
| 246 | |
| 247 | if (select(fd+1, &fds, NULL, NULL, |
| 248 | io_timeout?&tv:NULL) != 1) { |
| 249 | check_timeout(); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | if (ret <= 0) |
| 254 | return total; |
| 255 | total += ret; |
| 256 | } |
| 257 | |
| 258 | if (io_timeout) |
| 259 | last_io = time(NULL); |
| 260 | return total; |
| 261 | } |
| 262 | |
| 263 | |
| 264 | int32 read_int(int f) |
| 265 | { |
| 266 | int ret; |
| 267 | char b[4]; |
| 268 | if ((ret=readfd(f,b,4)) != 4) { |
| 269 | if (verbose > 1) |
| 270 | rprintf(FERROR,"(%d) read_int: Error reading %d bytes : %s\n", |
| 271 | getpid(),4,ret==-1?strerror(errno):"EOF"); |
| 272 | exit_cleanup(1); |
| 273 | } |
| 274 | total_read += 4; |
| 275 | return IVAL(b,0); |
| 276 | } |
| 277 | |
| 278 | int64 read_longint(int f) |
| 279 | { |
| 280 | extern int remote_version; |
| 281 | int64 ret; |
| 282 | char b[8]; |
| 283 | ret = read_int(f); |
| 284 | |
| 285 | if ((int32)ret != (int32)0xffffffff) return ret; |
| 286 | |
| 287 | #ifdef NO_INT64 |
| 288 | rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n"); |
| 289 | exit_cleanup(1); |
| 290 | #else |
| 291 | if (remote_version >= 16) { |
| 292 | if ((ret=readfd(f,b,8)) != 8) { |
| 293 | if (verbose > 1) |
| 294 | rprintf(FERROR,"(%d) read_longint: Error reading %d bytes : %s\n", |
| 295 | getpid(),8,ret==-1?strerror(errno):"EOF"); |
| 296 | exit_cleanup(1); |
| 297 | } |
| 298 | total_read += 8; |
| 299 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); |
| 300 | } |
| 301 | #endif |
| 302 | |
| 303 | return ret; |
| 304 | } |
| 305 | |
| 306 | void read_buf(int f,char *buf,int len) |
| 307 | { |
| 308 | int ret; |
| 309 | if ((ret=readfd(f,buf,len)) != len) { |
| 310 | if (verbose > 1) |
| 311 | rprintf(FERROR,"(%d) read_buf: Error reading %d bytes : %s\n", |
| 312 | getpid(),len,ret==-1?strerror(errno):"EOF"); |
| 313 | exit_cleanup(1); |
| 314 | } |
| 315 | total_read += len; |
| 316 | } |
| 317 | |
| 318 | void read_sbuf(int f,char *buf,int len) |
| 319 | { |
| 320 | read_buf(f,buf,len); |
| 321 | buf[len] = 0; |
| 322 | } |
| 323 | |
| 324 | unsigned char read_byte(int f) |
| 325 | { |
| 326 | unsigned char c; |
| 327 | read_buf(f,(char *)&c,1); |
| 328 | return c; |
| 329 | } |
| 330 | |
| 331 | |
| 332 | static char last_byte; |
| 333 | static int last_sparse; |
| 334 | |
| 335 | int sparse_end(int f) |
| 336 | { |
| 337 | if (last_sparse) { |
| 338 | do_lseek(f,-1,SEEK_CUR); |
| 339 | return (write(f,&last_byte,1) == 1 ? 0 : -1); |
| 340 | } |
| 341 | last_sparse = 0; |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | |
| 346 | static int write_sparse(int f,char *buf,int len) |
| 347 | { |
| 348 | int l1=0,l2=0; |
| 349 | int ret; |
| 350 | |
| 351 | for (l1=0;l1<len && buf[l1]==0;l1++) ; |
| 352 | for (l2=0;l2<(len-l1) && buf[len-(l2+1)]==0;l2++) ; |
| 353 | |
| 354 | last_byte = buf[len-1]; |
| 355 | |
| 356 | if (l1 == len || l2 > 0) |
| 357 | last_sparse=1; |
| 358 | |
| 359 | if (l1 > 0) |
| 360 | do_lseek(f,l1,SEEK_CUR); |
| 361 | |
| 362 | if (l1 == len) |
| 363 | return len; |
| 364 | |
| 365 | if ((ret=write(f,buf+l1,len-(l1+l2))) != len-(l1+l2)) { |
| 366 | if (ret == -1 || ret == 0) return ret; |
| 367 | return (l1+ret); |
| 368 | } |
| 369 | |
| 370 | if (l2 > 0) |
| 371 | do_lseek(f,l2,SEEK_CUR); |
| 372 | |
| 373 | return len; |
| 374 | } |
| 375 | |
| 376 | |
| 377 | |
| 378 | int write_file(int f,char *buf,int len) |
| 379 | { |
| 380 | int ret = 0; |
| 381 | |
| 382 | if (!sparse_files) |
| 383 | return write(f,buf,len); |
| 384 | |
| 385 | while (len>0) { |
| 386 | int len1 = MIN(len, SPARSE_WRITE_SIZE); |
| 387 | int r1 = write_sparse(f, buf, len1); |
| 388 | if (r1 <= 0) { |
| 389 | if (ret > 0) return ret; |
| 390 | return r1; |
| 391 | } |
| 392 | len -= r1; |
| 393 | buf += r1; |
| 394 | ret += r1; |
| 395 | } |
| 396 | return ret; |
| 397 | } |
| 398 | |
| 399 | |
| 400 | static int writefd_unbuffered(int fd,char *buf,int len) |
| 401 | { |
| 402 | int total = 0; |
| 403 | fd_set w_fds, r_fds; |
| 404 | int fd_count, count, got_select=0; |
| 405 | struct timeval tv; |
| 406 | |
| 407 | while (total < len) { |
| 408 | int ret = write(fd,buf+total,len-total); |
| 409 | |
| 410 | if (ret == 0) return total; |
| 411 | |
| 412 | if (ret == -1 && !(errno == EWOULDBLOCK || errno == EAGAIN)) |
| 413 | return -1; |
| 414 | |
| 415 | if (ret == -1 && got_select) { |
| 416 | /* hmmm, we got a write select on the fd and |
| 417 | then failed to write. Why doesn't that |
| 418 | mean that the fd is dead? It doesn't on |
| 419 | some systems it seems (eg. IRIX) */ |
| 420 | u_sleep(1000); |
| 421 | } |
| 422 | |
| 423 | got_select = 0; |
| 424 | |
| 425 | |
| 426 | if (ret != -1) { |
| 427 | total += ret; |
| 428 | continue; |
| 429 | } |
| 430 | |
| 431 | if (read_buffer_len < MAX_READ_BUFFER && buffer_f_in != -1) |
| 432 | read_check(buffer_f_in); |
| 433 | |
| 434 | fd_count = fd+1; |
| 435 | FD_ZERO(&w_fds); |
| 436 | FD_ZERO(&r_fds); |
| 437 | FD_SET(fd,&w_fds); |
| 438 | if (buffer_f_in != -1) { |
| 439 | FD_SET(buffer_f_in,&r_fds); |
| 440 | if (buffer_f_in > fd) |
| 441 | fd_count = buffer_f_in+1; |
| 442 | } |
| 443 | |
| 444 | tv.tv_sec = BLOCKING_TIMEOUT; |
| 445 | tv.tv_usec = 0; |
| 446 | count = select(fd_count,buffer_f_in == -1? NULL: &r_fds, |
| 447 | &w_fds,NULL,&tv); |
| 448 | |
| 449 | if (count == -1 && errno != EINTR) { |
| 450 | if (verbose > 1) |
| 451 | rprintf(FERROR,"select error: %s\n", strerror(errno)); |
| 452 | exit_cleanup(1); |
| 453 | } |
| 454 | |
| 455 | if (count == 0) { |
| 456 | check_timeout(); |
| 457 | continue; |
| 458 | } |
| 459 | |
| 460 | if (FD_ISSET(fd, &w_fds)) { |
| 461 | got_select = 1; |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | if (io_timeout) |
| 466 | last_io = time(NULL); |
| 467 | |
| 468 | return total; |
| 469 | } |
| 470 | |
| 471 | |
| 472 | static char *io_buffer; |
| 473 | static int io_buffer_count; |
| 474 | |
| 475 | void io_start_buffering(int fd) |
| 476 | { |
| 477 | if (io_buffer) return; |
| 478 | multiplex_out_fd = fd; |
| 479 | io_buffer = (char *)malloc(IO_BUFFER_SIZE+4); |
| 480 | if (!io_buffer) out_of_memory("writefd"); |
| 481 | io_buffer_count = 0; |
| 482 | |
| 483 | /* leave room for the multiplex header in case it's needed */ |
| 484 | io_buffer += 4; |
| 485 | } |
| 486 | |
| 487 | void io_flush(void) |
| 488 | { |
| 489 | int fd = multiplex_out_fd; |
| 490 | if (!io_buffer_count) return; |
| 491 | |
| 492 | if (io_multiplexing_out) { |
| 493 | SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count); |
| 494 | if (writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4) != |
| 495 | io_buffer_count+4) { |
| 496 | rprintf(FERROR,"write failed\n"); |
| 497 | exit_cleanup(1); |
| 498 | } |
| 499 | } else { |
| 500 | if (writefd_unbuffered(fd, io_buffer, io_buffer_count) != |
| 501 | io_buffer_count) { |
| 502 | rprintf(FERROR,"write failed\n"); |
| 503 | exit_cleanup(1); |
| 504 | } |
| 505 | } |
| 506 | io_buffer_count = 0; |
| 507 | } |
| 508 | |
| 509 | void io_end_buffering(int fd) |
| 510 | { |
| 511 | io_flush(); |
| 512 | if (!io_multiplexing_out) { |
| 513 | free(io_buffer-4); |
| 514 | io_buffer = NULL; |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | static int writefd(int fd,char *buf,int len1) |
| 519 | { |
| 520 | int len = len1; |
| 521 | |
| 522 | if (!io_buffer) return writefd_unbuffered(fd, buf, len); |
| 523 | |
| 524 | while (len) { |
| 525 | int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count); |
| 526 | if (n > 0) { |
| 527 | memcpy(io_buffer+io_buffer_count, buf, n); |
| 528 | buf += n; |
| 529 | len -= n; |
| 530 | io_buffer_count += n; |
| 531 | } |
| 532 | |
| 533 | if (io_buffer_count == IO_BUFFER_SIZE) io_flush(); |
| 534 | } |
| 535 | |
| 536 | return len1; |
| 537 | } |
| 538 | |
| 539 | |
| 540 | void write_int(int f,int32 x) |
| 541 | { |
| 542 | int ret; |
| 543 | char b[4]; |
| 544 | SIVAL(b,0,x); |
| 545 | if ((ret=writefd(f,b,4)) != 4) { |
| 546 | rprintf(FERROR,"write_int failed : %s\n", |
| 547 | ret==-1?strerror(errno):"EOF"); |
| 548 | exit_cleanup(1); |
| 549 | } |
| 550 | total_written += 4; |
| 551 | } |
| 552 | |
| 553 | void write_longint(int f, int64 x) |
| 554 | { |
| 555 | extern int remote_version; |
| 556 | char b[8]; |
| 557 | int ret; |
| 558 | |
| 559 | if (remote_version < 16 || x <= 0x7FFFFFFF) { |
| 560 | write_int(f, (int)x); |
| 561 | return; |
| 562 | } |
| 563 | |
| 564 | write_int(f, -1); |
| 565 | SIVAL(b,0,(x&0xFFFFFFFF)); |
| 566 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); |
| 567 | |
| 568 | if ((ret=writefd(f,b,8)) != 8) { |
| 569 | rprintf(FERROR,"write_longint failed : %s\n", |
| 570 | ret==-1?strerror(errno):"EOF"); |
| 571 | exit_cleanup(1); |
| 572 | } |
| 573 | total_written += 8; |
| 574 | } |
| 575 | |
| 576 | void write_buf(int f,char *buf,int len) |
| 577 | { |
| 578 | int ret; |
| 579 | if ((ret=writefd(f,buf,len)) != len) { |
| 580 | rprintf(FERROR,"write_buf failed : %s\n", |
| 581 | ret==-1?strerror(errno):"EOF"); |
| 582 | exit_cleanup(1); |
| 583 | } |
| 584 | total_written += len; |
| 585 | } |
| 586 | |
| 587 | /* write a string to the connection */ |
| 588 | void write_sbuf(int f,char *buf) |
| 589 | { |
| 590 | write_buf(f, buf, strlen(buf)); |
| 591 | } |
| 592 | |
| 593 | |
| 594 | void write_byte(int f,unsigned char c) |
| 595 | { |
| 596 | write_buf(f,(char *)&c,1); |
| 597 | } |
| 598 | |
| 599 | void write_flush(int f) |
| 600 | { |
| 601 | } |
| 602 | |
| 603 | |
| 604 | int read_line(int f, char *buf, int maxlen) |
| 605 | { |
| 606 | while (maxlen) { |
| 607 | read_buf(f, buf, 1); |
| 608 | if (buf[0] == '\n') { |
| 609 | buf[0] = 0; |
| 610 | break; |
| 611 | } |
| 612 | if (buf[0] != '\r') { |
| 613 | buf++; |
| 614 | maxlen--; |
| 615 | } |
| 616 | } |
| 617 | if (maxlen == 0) { |
| 618 | *buf = 0; |
| 619 | return 0; |
| 620 | } |
| 621 | return 1; |
| 622 | } |
| 623 | |
| 624 | |
| 625 | void io_printf(int fd, const char *format, ...) |
| 626 | { |
| 627 | va_list ap; |
| 628 | char buf[1024]; |
| 629 | int len; |
| 630 | |
| 631 | va_start(ap, format); |
| 632 | len = vslprintf(buf, sizeof(buf)-1, format, ap); |
| 633 | va_end(ap); |
| 634 | |
| 635 | if (len < 0) exit_cleanup(1); |
| 636 | |
| 637 | write_sbuf(fd, buf); |
| 638 | } |
| 639 | |
| 640 | |
| 641 | /* setup for multiplexing an error stream with the data stream */ |
| 642 | void io_start_multiplex_out(int fd) |
| 643 | { |
| 644 | multiplex_out_fd = fd; |
| 645 | io_flush(); |
| 646 | io_start_buffering(fd); |
| 647 | io_multiplexing_out = 1; |
| 648 | } |
| 649 | |
| 650 | /* setup for multiplexing an error stream with the data stream */ |
| 651 | void io_start_multiplex_in(int fd) |
| 652 | { |
| 653 | multiplex_in_fd = fd; |
| 654 | io_flush(); |
| 655 | if (read_buffer_len) { |
| 656 | fprintf(stderr,"ERROR: data in read buffer at mplx start\n"); |
| 657 | exit_cleanup(1); |
| 658 | } |
| 659 | |
| 660 | io_multiplexing_in = 1; |
| 661 | } |
| 662 | |
| 663 | /* write an message to the error stream */ |
| 664 | int io_multiplex_write(int f, char *buf, int len) |
| 665 | { |
| 666 | if (!io_multiplexing_out) return 0; |
| 667 | |
| 668 | io_flush(); |
| 669 | |
| 670 | SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len); |
| 671 | memcpy(io_buffer, buf, len); |
| 672 | |
| 673 | writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4); |
| 674 | return 1; |
| 675 | } |
| 676 | |
| 677 | void io_close_input(int fd) |
| 678 | { |
| 679 | buffer_f_in = -1; |
| 680 | } |