It is important to understand the difference between

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Unformatted text preview: d. */ optval = 1; Setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (const void *)&optval , sizeof(int)); 686 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 APPENDIX A. ERROR HANDLING /* listenfd will be an endpoint for all requests to port on any IP address for this host */ bzero((char *) &serveraddr, sizeof(serveraddr)); serveraddr.sin_family = AF_INET; serveraddr.sin_addr.s_addr = htonl(INADDR_ANY); serveraddr.sin_port = htons((unsigned short)port); Bind(listenfd, (SA *)&serveraddr, sizeof(serveraddr)); /* make it a listening socket ready to accept connection requests */ Listen(listenfd, LISTENQ); return listenfd; } /****************************************** * I/O helper functions (from Stevens UNP) ******************************************/ ssize_t readn(int fd, void *buf, size_t count) { size_t nleft = count; ssize_t nread; char *ptr = buf; while (nleft > 0) { if ((nread = read(fd, ptr, nleft)) < 0) { if (errno == EINTR) nread = 0; /* and call read() again */ else return -1; /* errno s...
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