1 #include "first.h" 2 3 #include "network_write.h" 4 5 #include "base.h" 6 #include "ck.h" 7 #include "log.h" 8 9 #include <sys/types.h> 10 #include "sys-socket.h" 11 12 #include <errno.h> 13 #include <string.h> 14 #include <unistd.h> 15 16 17 /* on linux 2.4.x you get either sendfile or LFS */ 18 #if defined HAVE_SYS_SENDFILE_H && defined HAVE_SENDFILE \ 19 && (!defined _LARGEFILE_SOURCE || defined HAVE_SENDFILE64) \ 20 && defined(__linux__) && !defined HAVE_SENDFILE_BROKEN 21 # ifdef NETWORK_WRITE_USE_SENDFILE 22 # error "can't have more than one sendfile implementation" 23 # endif 24 # define NETWORK_WRITE_USE_SENDFILE "linux-sendfile" 25 # define NETWORK_WRITE_USE_LINUX_SENDFILE 26 #endif 27 28 #if defined HAVE_SENDFILE && (defined(__FreeBSD__) || defined(__DragonFly__)) 29 # ifdef NETWORK_WRITE_USE_SENDFILE 30 # error "can't have more than one sendfile implementation" 31 # endif 32 # define NETWORK_WRITE_USE_SENDFILE "freebsd-sendfile" 33 # define NETWORK_WRITE_USE_FREEBSD_SENDFILE 34 #endif 35 36 #if defined HAVE_SENDFILE && defined(__APPLE__) 37 # ifdef NETWORK_WRITE_USE_SENDFILE 38 # error "can't have more than one sendfile implementation" 39 # endif 40 # define NETWORK_WRITE_USE_SENDFILE "darwin-sendfile" 41 # define NETWORK_WRITE_USE_DARWIN_SENDFILE 42 #endif 43 44 #if defined HAVE_SYS_SENDFILE_H && defined HAVE_SENDFILEV && defined(__sun) 45 # ifdef NETWORK_WRITE_USE_SENDFILE 46 # error "can't have more than one sendfile implementation" 47 # endif 48 # define NETWORK_WRITE_USE_SENDFILE "solaris-sendfilev" 49 # define NETWORK_WRITE_USE_SOLARIS_SENDFILEV 50 #endif 51 52 /* not supported so far 53 #if defined HAVE_SEND_FILE && defined(__aix) 54 # ifdef NETWORK_WRITE_USE_SENDFILE 55 # error "can't have more than one sendfile implementation" 56 # endif 57 # define NETWORK_WRITE_USE_SENDFILE "aix-sendfile" 58 # define NETWORK_WRITE_USE_AIX_SENDFILE 59 #endif 60 */ 61 62 #if defined HAVE_SYS_UIO_H && defined HAVE_WRITEV 63 # define NETWORK_WRITE_USE_WRITEV 64 #endif 65 66 #if defined HAVE_SYS_MMAN_H && defined HAVE_MMAP && defined ENABLE_MMAP 67 # define NETWORK_WRITE_USE_MMAP 68 #endif 69 70 71 __attribute_cold__ 72 static int network_write_error(int fd, log_error_st *errh) { 73 #if defined(__WIN32) 74 int lastError = WSAGetLastError(); 75 switch (lastError) { 76 case WSAEINTR: 77 case WSAEWOULDBLOCK: 78 return -3; 79 case WSAECONNRESET: 80 case WSAETIMEDOUT: 81 case WSAECONNABORTED: 82 return -2; 83 default: 84 log_error(errh,__FILE__,__LINE__,"send failed: %d %d",lastError,fd); 85 return -1; 86 } 87 #else /* __WIN32 */ 88 switch (errno) { 89 case EAGAIN: 90 case EINTR: 91 return -3; 92 case EPIPE: 93 case ECONNRESET: 94 return -2; 95 default: 96 log_perror(errh,__FILE__,__LINE__,"write failed: %d",fd); 97 return -1; 98 } 99 #endif /* __WIN32 */ 100 } 101 102 __attribute_cold__ 103 static int network_remove_finished_chunks(chunkqueue * const cq, const off_t len) { 104 force_assert(len >= 0); 105 chunkqueue_remove_finished_chunks(cq); 106 return 0; 107 } 108 109 inline 110 static ssize_t network_write_data_len(int fd, const char *data, off_t len) { 111 #if defined(__WIN32) 112 return send(fd, data, len, 0); 113 #else /* __WIN32 */ 114 return write(fd, data, len); 115 #endif /* __WIN32 */ 116 } 117 118 static int network_write_accounting(const int fd, chunkqueue * const cq, off_t * const p_max_bytes, log_error_st * const errh, const ssize_t wr, const off_t toSend) { 119 if (wr >= 0) { 120 *p_max_bytes -= wr;/*(toSend > 0 if we reach this func)*/ 121 const int rc = (wr == toSend && *p_max_bytes > 0) ? 0 : -3; 122 chunkqueue_mark_written(cq, wr); 123 return rc; 124 } 125 else 126 return network_write_error(fd, errh); 127 } 128 129 130 131 132 /* write next chunk(s); finished chunks are removed afterwards after successful writes. 133 * return values: similar as backends (0 success, -1 error, -2 remote close, -3 try again later (EINTR/EAGAIN)) */ 134 /* next chunk must be MEM_CHUNK. use write()/send() */ 135 #if !defined(NETWORK_WRITE_USE_WRITEV) 136 static int network_write_mem_chunk(const int fd, chunkqueue * const cq, off_t * const p_max_bytes, log_error_st * const errh) { 137 chunk* const c = cq->first; 138 off_t c_len = (off_t)buffer_clen(c->mem) - c->offset; 139 if (c_len > *p_max_bytes) c_len = *p_max_bytes; 140 if (c_len <= 0) return network_remove_finished_chunks(cq, c_len); 141 142 ssize_t wr = network_write_data_len(fd, c->mem->ptr + c->offset, c_len); 143 return network_write_accounting(fd, cq, p_max_bytes, errh, wr, c_len); 144 } 145 #endif 146 147 148 149 150 #if !defined(NETWORK_WRITE_USE_MMAP) 151 152 static int network_write_file_chunk_no_mmap(const int fd, chunkqueue * const cq, off_t * const p_max_bytes, log_error_st * const errh) { 153 chunk* const c = cq->first; 154 off_t offset, toSend; 155 char buf[16384]; /* max read 16kb in one step */ 156 157 offset = c->offset; 158 toSend = c->file.length - c->offset; 159 if (toSend > *p_max_bytes) toSend = *p_max_bytes; 160 if (toSend <= 0) return network_remove_finished_chunks(cq, toSend); 161 162 if (c->file.fd < 0 && 0 != chunkqueue_open_file_chunk(cq, errh)) return -1; 163 164 if (toSend > (off_t)sizeof(buf)) toSend = (off_t)sizeof(buf); 165 166 if (-1 == lseek(c->file.fd, offset, SEEK_SET)) { 167 log_perror(errh, __FILE__, __LINE__, "lseek"); 168 return -1; 169 } 170 if ((toSend = read(c->file.fd, buf, toSend)) <= 0) { 171 log_perror(errh, __FILE__, __LINE__, "read");/* err or unexpected EOF */ 172 return -1; 173 } 174 175 ssize_t wr = network_write_data_len(fd, buf, toSend); 176 return network_write_accounting(fd, cq, p_max_bytes, errh, wr, toSend); 177 } 178 179 #endif 180 181 182 183 184 #if defined(NETWORK_WRITE_USE_MMAP) 185 186 #include "sys-mmap.h" 187 188 #include <setjmp.h> 189 #include <signal.h> 190 191 #define MMAP_CHUNK_SIZE (512*1024) 192 193 static off_t mmap_align_offset(off_t start) { 194 static long pagesize = 0; 195 if (0 == pagesize) { 196 pagesize = sysconf(_SC_PAGESIZE); 197 force_assert(pagesize < MMAP_CHUNK_SIZE); 198 } 199 force_assert(start >= (start % pagesize)); 200 return start - (start % pagesize); 201 } 202 203 static volatile int sigbus_jmp_valid; 204 static sigjmp_buf sigbus_jmp; 205 206 static void sigbus_handler(int sig) { 207 UNUSED(sig); 208 if (sigbus_jmp_valid) siglongjmp(sigbus_jmp, 1); 209 ck_bt_abort(__FILE__, __LINE__, "SIGBUS"); 210 } 211 212 /* next chunk must be FILE_CHUNK. send mmap()ed file with write() */ 213 static int network_write_file_chunk_mmap(const int fd, chunkqueue * const cq, off_t * const p_max_bytes, log_error_st * const errh) { 214 chunk* const c = cq->first; 215 off_t offset, toSend, file_end; 216 size_t mmap_offset, mmap_avail; 217 const char *data; 218 219 file_end = c->file.length; /*file end offset in this chunk*/ 220 offset = c->offset; 221 toSend = c->file.length - c->offset; 222 if (toSend > *p_max_bytes) toSend = *p_max_bytes; 223 if (toSend <= 0) return network_remove_finished_chunks(cq, toSend); 224 225 if (c->file.fd < 0 && 0 != chunkqueue_open_file_chunk(cq, errh)) return -1; 226 227 /* mmap buffer if offset is outside old mmap area or not mapped at all */ 228 if (MAP_FAILED == c->file.mmap.start 229 || offset < c->file.mmap.offset 230 || offset >= (off_t)(c->file.mmap.offset + c->file.mmap.length)) { 231 232 if (MAP_FAILED != c->file.mmap.start) { 233 munmap(c->file.mmap.start, c->file.mmap.length); 234 c->file.mmap.start = MAP_FAILED; 235 } 236 237 /* Optimizations for the future: 238 * 239 * adaptive mem-mapping 240 * the problem: 241 * we mmap() the whole file. If someone has a lot of large files and 242 * 32-bit machine the virtual address area will be exhausted and we 243 * will have a failing mmap() call. 244 * solution: 245 * only mmap 16M in one chunk and move the window as soon as we have 246 * finished the first 8M 247 * 248 * read-ahead buffering 249 * the problem: 250 * sending out several large files in parallel trashes read-ahead 251 * of the kernel leading to long wait-for-seek times. 252 * solutions: (increasing complexity) 253 * 1. use madvise 254 * 2. use a internal read-ahead buffer in the chunk-structure 255 * 3. use non-blocking IO for file-transfers 256 * */ 257 258 c->file.mmap.offset = mmap_align_offset(offset); 259 260 /* all mmap()ed areas are MMAP_CHUNK_SIZE 261 * except the last which might be smaller */ 262 c->file.mmap.length = MMAP_CHUNK_SIZE; 263 if (c->file.mmap.offset > file_end - (off_t)c->file.mmap.length) { 264 c->file.mmap.length = file_end - c->file.mmap.offset; 265 } 266 267 c->file.mmap.start = mmap(NULL, c->file.mmap.length, PROT_READ, 268 MAP_SHARED, c->file.fd, c->file.mmap.offset); 269 if (MAP_FAILED == c->file.mmap.start) { 270 log_perror(errh, __FILE__, __LINE__, 271 "mmap failed: %s %d %lld %zu", c->mem->ptr, c->file.fd, 272 (long long)c->file.mmap.offset, c->file.mmap.length); 273 return -1; 274 } 275 276 #if defined(HAVE_MADVISE) 277 /* don't advise files < 64Kb */ 278 if (c->file.mmap.length > (64*1024)) { 279 /* darwin 7 is returning EINVAL all the time and I don't know how to 280 * detect this at runtime. 281 * 282 * ignore the return value for now */ 283 madvise(c->file.mmap.start, c->file.mmap.length, MADV_WILLNEED); 284 } 285 #endif 286 } 287 288 force_assert(offset >= c->file.mmap.offset); 289 mmap_offset = offset - c->file.mmap.offset; 290 force_assert(c->file.mmap.length > mmap_offset); 291 mmap_avail = c->file.mmap.length - mmap_offset; 292 if (toSend > (off_t) mmap_avail) toSend = mmap_avail; 293 294 data = c->file.mmap.start + mmap_offset; 295 296 /* setup SIGBUS handler, but don't activate sigbus_jmp_valid yet */ 297 if (0 == sigsetjmp(sigbus_jmp, 1)) { 298 signal(SIGBUS, sigbus_handler); 299 300 sigbus_jmp_valid = 1; 301 ssize_t wr = network_write_data_len(fd, data, toSend); 302 sigbus_jmp_valid = 0; 303 return network_write_accounting(fd, cq, p_max_bytes, errh, wr, toSend); 304 } else { 305 sigbus_jmp_valid = 0; 306 307 log_error(errh, __FILE__, __LINE__, 308 "SIGBUS in mmap: %s %d", c->mem->ptr, c->file.fd); 309 310 munmap(c->file.mmap.start, c->file.mmap.length); 311 c->file.mmap.start = MAP_FAILED; 312 return -1; 313 } 314 315 } 316 317 #endif /* NETWORK_WRITE_USE_MMAP */ 318 319 320 321 322 #if defined(NETWORK_WRITE_USE_WRITEV) 323 324 #if defined(HAVE_SYS_UIO_H) 325 # include <sys/uio.h> 326 #endif 327 328 #if defined(UIO_MAXIOV) 329 # define SYS_MAX_CHUNKS UIO_MAXIOV 330 #elif defined(IOV_MAX) 331 /* new name for UIO_MAXIOV since IEEE Std 1003.1-2001 */ 332 # define SYS_MAX_CHUNKS IOV_MAX 333 #elif defined(_XOPEN_IOV_MAX) 334 /* minimum value for sysconf(_SC_IOV_MAX); posix requires this to be at least 16, which is good enough - no need to call sysconf() */ 335 # define SYS_MAX_CHUNKS _XOPEN_IOV_MAX 336 #else 337 # error neither UIO_MAXIOV nor IOV_MAX nor _XOPEN_IOV_MAX are defined 338 #endif 339 340 /* allocate iovec[MAX_CHUNKS] on stack, so pick a sane limit: 341 * - each entry will use 1 pointer + 1 size_t 342 * - 32 chunks -> 256 / 512 bytes (32-bit/64-bit pointers) 343 */ 344 #define STACK_MAX_ALLOC_CHUNKS 32 345 #if SYS_MAX_CHUNKS > STACK_MAX_ALLOC_CHUNKS 346 # define MAX_CHUNKS STACK_MAX_ALLOC_CHUNKS 347 #else 348 # define MAX_CHUNKS SYS_MAX_CHUNKS 349 #endif 350 351 /* next chunk must be MEM_CHUNK. send multiple mem chunks using writev() */ 352 static int network_writev_mem_chunks(const int fd, chunkqueue * const cq, off_t * const p_max_bytes, log_error_st * const errh) { 353 size_t num_chunks = 0; 354 off_t toSend = 0; 355 struct iovec chunks[MAX_CHUNKS]; 356 357 for (const chunk *c = cq->first; c && MEM_CHUNK == c->type; c = c->next) { 358 const off_t c_len = (off_t)buffer_clen(c->mem) - c->offset; 359 if (c_len > 0) { 360 toSend += c_len; 361 362 chunks[num_chunks].iov_base = c->mem->ptr + c->offset; 363 chunks[num_chunks].iov_len = (size_t)c_len; 364 365 if (++num_chunks == MAX_CHUNKS || toSend >= *p_max_bytes) break; 366 } 367 else if (c_len < 0) /*(should not happen; trigger assert)*/ 368 return network_remove_finished_chunks(cq, c_len); 369 } 370 if (0 == num_chunks) return network_remove_finished_chunks(cq, 0); 371 372 ssize_t wr = writev(fd, chunks, num_chunks); 373 return network_write_accounting(fd, cq, p_max_bytes, errh, wr, toSend); 374 } 375 376 #endif /* NETWORK_WRITE_USE_WRITEV */ 377 378 379 380 381 #if defined(NETWORK_WRITE_USE_SENDFILE) 382 383 #if defined(NETWORK_WRITE_USE_LINUX_SENDFILE) \ 384 || defined(NETWORK_WRITE_USE_SOLARIS_SENDFILEV) 385 #include <sys/sendfile.h> 386 #endif 387 388 #if defined(NETWORK_WRITE_USE_FREEBSD_SENDFILE) \ 389 || defined(NETWORK_WRITE_USE_DARWIN_SENDFILE) 390 #include <sys/uio.h> 391 #endif 392 393 static int network_write_file_chunk_sendfile(const int fd, chunkqueue * const cq, off_t * const p_max_bytes, log_error_st * const errh) { 394 chunk * const c = cq->first; 395 ssize_t wr; 396 off_t offset; 397 off_t toSend; 398 off_t written = 0; 399 400 offset = c->offset; 401 toSend = c->file.length - c->offset; 402 if (toSend > *p_max_bytes) toSend = *p_max_bytes; 403 if (toSend <= 0) return network_remove_finished_chunks(cq, toSend); 404 405 if (c->file.fd < 0 && 0 != chunkqueue_open_file_chunk(cq, errh)) return -1; 406 407 /* Darwin, FreeBSD, and Solaris variants support iovecs and could 408 * be optimized to send more than just file in single syscall */ 409 410 #if defined(NETWORK_WRITE_USE_LINUX_SENDFILE) 411 412 wr = sendfile(fd, c->file.fd, &offset, toSend); 413 if (wr > 0) written = (off_t)wr; 414 415 #elif defined(NETWORK_WRITE_USE_DARWIN_SENDFILE) 416 417 written = toSend; 418 wr = sendfile(c->file.fd, fd, offset, &written, NULL, 0); 419 /* (for EAGAIN/EINTR written still contains the sent bytes) */ 420 421 #elif defined(NETWORK_WRITE_USE_FREEBSD_SENDFILE) 422 423 wr = sendfile(c->file.fd, fd, offset, toSend, NULL, &written, 0); 424 /* (for EAGAIN/EINTR written still contains the sent bytes) */ 425 426 #elif defined(NETWORK_WRITE_USE_SOLARIS_SENDFILEV) 427 { 428 sendfilevec_t fvec; 429 fvec.sfv_fd = c->file.fd; 430 fvec.sfv_flag = 0; 431 fvec.sfv_off = offset; 432 fvec.sfv_len = toSend; 433 434 /* Solaris sendfilev() */ 435 wr = sendfilev(fd, &fvec, 1, (size_t *)&written); 436 /* (for EAGAIN/EINTR written still contains the sent bytes) */ 437 } 438 #else 439 440 wr = -1; 441 errno = ENOSYS; 442 443 #endif 444 445 if (-1 == wr) { 446 switch(errno) { 447 case EAGAIN: 448 case EINTR: 449 break; /* try again later */ 450 case EPIPE: 451 case ECONNRESET: 452 case ENOTCONN: 453 return -2; 454 case EINVAL: 455 case ENOSYS: 456 #if defined(ENOTSUP) && (!defined(EOPNOTSUPP) || EOPNOTSUPP != ENOTSUP) 457 case ENOTSUP: 458 #endif 459 #ifdef EOPNOTSUPP 460 case EOPNOTSUPP: 461 #endif 462 #ifdef ESOCKTNOSUPPORT 463 case ESOCKTNOSUPPORT: 464 #endif 465 #ifdef EAFNOSUPPORT 466 case EAFNOSUPPORT: 467 #endif 468 #ifdef NETWORK_WRITE_USE_MMAP 469 return network_write_file_chunk_mmap(fd, cq, p_max_bytes, errh); 470 #else 471 return network_write_file_chunk_no_mmap(fd, cq, p_max_bytes, errh); 472 #endif 473 default: 474 log_perror(errh, __FILE__, __LINE__, "sendfile(): fd: %d", fd); 475 return -1; 476 } 477 } 478 479 if (written > 0) { 480 chunkqueue_mark_written(cq, written); 481 *p_max_bytes -= written; 482 if (__builtin_expect( (*p_max_bytes <= 0), 0)) return -3; 483 } 484 else if (0 == wr) { /*(-1 != wr && 0 == written)*/ 485 log_error(errh, __FILE__, __LINE__, 486 "sendfile(): fd: %d file truncated", fd); 487 return -1; 488 } 489 490 return (wr >= 0 && written == toSend) ? 0 : -3; 491 } 492 493 #endif 494 495 496 497 498 /* return values: 499 * >= 0 : no error 500 * -1 : error (on our side) 501 * -2 : remote close 502 */ 503 504 static int network_write_chunkqueue_writev(const int fd, chunkqueue * const cq, off_t max_bytes, log_error_st * const errh) { 505 while (NULL != cq->first) { 506 int rc = -1; 507 508 switch (cq->first->type) { 509 case MEM_CHUNK: 510 #if defined(NETWORK_WRITE_USE_WRITEV) 511 rc = network_writev_mem_chunks(fd, cq, &max_bytes, errh); 512 #else 513 rc = network_write_mem_chunk(fd, cq, &max_bytes, errh); 514 #endif 515 break; 516 case FILE_CHUNK: 517 #ifdef NETWORK_WRITE_USE_MMAP 518 rc = network_write_file_chunk_mmap(fd, cq, &max_bytes, errh); 519 #else 520 rc = network_write_file_chunk_no_mmap(fd, cq, &max_bytes, errh); 521 #endif 522 break; 523 } 524 525 if (__builtin_expect( (0 != rc), 0)) return (-3 == rc) ? 0 : rc; 526 } 527 528 return 0; 529 } 530 531 #if defined(NETWORK_WRITE_USE_SENDFILE) 532 static int network_write_chunkqueue_sendfile(const int fd, chunkqueue * const cq, off_t max_bytes, log_error_st * const errh) { 533 while (NULL != cq->first) { 534 int rc = -1; 535 536 switch (cq->first->type) { 537 case MEM_CHUNK: 538 #if defined(NETWORK_WRITE_USE_WRITEV) 539 rc = network_writev_mem_chunks(fd, cq, &max_bytes, errh); 540 #else 541 rc = network_write_mem_chunk(fd, cq, &max_bytes, errh); 542 #endif 543 break; 544 case FILE_CHUNK: 545 #if defined(NETWORK_WRITE_USE_SENDFILE) 546 rc = network_write_file_chunk_sendfile(fd, cq, &max_bytes, errh); 547 #elif defined(NETWORK_WRITE_USE_MMAP) 548 rc = network_write_file_chunk_mmap(fd, cq, &max_bytes, errh); 549 #else 550 rc = network_write_file_chunk_no_mmap(fd, cq, &max_bytes, errh); 551 #endif 552 break; 553 } 554 555 if (__builtin_expect( (0 != rc), 0)) return (-3 == rc) ? 0 : rc; 556 } 557 558 return 0; 559 } 560 #endif 561 562 int network_write_init(server *srv) { 563 typedef enum { 564 NETWORK_BACKEND_UNSET, 565 NETWORK_BACKEND_WRITE, 566 NETWORK_BACKEND_WRITEV, 567 NETWORK_BACKEND_SENDFILE, 568 } network_backend_t; 569 570 network_backend_t backend; 571 572 struct nb_map { 573 network_backend_t nb; 574 const char *name; 575 } network_backends[] = { 576 /* lowest id wins */ 577 { NETWORK_BACKEND_SENDFILE, "sendfile" }, 578 { NETWORK_BACKEND_SENDFILE, "linux-sendfile" }, 579 { NETWORK_BACKEND_SENDFILE, "freebsd-sendfile" }, 580 { NETWORK_BACKEND_SENDFILE, "solaris-sendfilev" }, 581 { NETWORK_BACKEND_WRITEV, "writev" }, 582 { NETWORK_BACKEND_WRITE, "write" }, 583 { NETWORK_BACKEND_UNSET, NULL } 584 }; 585 586 /* get a useful default */ 587 backend = network_backends[0].nb; 588 589 /* match name against known types */ 590 if (srv->srvconf.network_backend) { 591 const char *name, *confname = srv->srvconf.network_backend->ptr; 592 for (size_t i = 0; NULL != (name = network_backends[i].name); ++i) { 593 if (0 == strcmp(confname, name)) { 594 backend = network_backends[i].nb; 595 break; 596 } 597 } 598 if (NULL == name) { 599 log_error(srv->errh, __FILE__, __LINE__, 600 "server.network-backend has an unknown value: %s", confname); 601 return -1; 602 } 603 } 604 605 switch(backend) { 606 case NETWORK_BACKEND_SENDFILE: 607 #if defined(NETWORK_WRITE_USE_SENDFILE) 608 srv->network_backend_write = network_write_chunkqueue_sendfile; 609 break; 610 #endif 611 case NETWORK_BACKEND_WRITEV: 612 case NETWORK_BACKEND_WRITE: 613 srv->network_backend_write = network_write_chunkqueue_writev; 614 break; 615 default: 616 return -1; 617 } 618 619 return 0; 620 } 621 622 const char * network_write_show_handlers(void) { 623 return 624 "\nNetwork handler:\n\n" 625 #if defined NETWORK_WRITE_USE_LINUX_SENDFILE 626 "\t+ linux-sendfile\n" 627 #else 628 "\t- linux-sendfile\n" 629 #endif 630 #if defined NETWORK_WRITE_USE_FREEBSD_SENDFILE 631 "\t+ freebsd-sendfile\n" 632 #else 633 "\t- freebsd-sendfile\n" 634 #endif 635 #if defined NETWORK_WRITE_USE_DARWIN_SENDFILE 636 "\t+ darwin-sendfile\n" 637 #else 638 "\t- darwin-sendfile\n" 639 #endif 640 #if defined NETWORK_WRITE_USE_SOLARIS_SENDFILEV 641 "\t+ solaris-sendfilev\n" 642 #else 643 "\t- solaris-sendfilev\n" 644 #endif 645 #if defined NETWORK_WRITE_USE_WRITEV 646 "\t+ writev\n" 647 #else 648 "\t- writev\n" 649 #endif 650 "\t+ write\n" 651 #ifdef NETWORK_WRITE_USE_MMAP 652 "\t+ mmap support\n" 653 #else 654 "\t- mmap support\n" 655 #endif 656 ; 657 } 658