gcc/testsuite/c-c++-common/analyzer/fd-manpage-getaddrinfo-client.c

   1 /* Example from getaddrinfo.3 manpage, which has this license:
   2
   3 Copyright (c) 2007, 2008 Michael Kerrisk <mtk.manpages@gmail.com>
   4 and Copyright (c) 2006 Ulrich Drepper <drepper@redhat.com>
   5 A few pieces of an earlier version remain:
   6 Copyright 2000, Sam Varshavchik <mrsam@courier-mta.com>
   7
   8 Permission is granted to make and distribute verbatim copies of this
   9 manual provided the copyright notice and this permission notice are
  10 preserved on all copies.
  11
  12 Permission is granted to copy and distribute modified versions of this
  13 manual under the conditions for verbatim copying, provided that the
  14 entire resulting derived work is distributed under the terms of a
  15 permission notice identical to this one.
  16
  17 Since the Linux kernel and libraries are constantly changing, this
  18 manual page may be incorrect or out-of-date.  The author(s) assume no
  19 responsibility for errors or omissions, or for damages resulting from
  20 the use of the information contained herein.  The author(s) may not
  21 have taken the same level of care in the production of this manual,
  22 which is licensed free of charge, as they might when working
  23 professionally.
  24
  25 Formatted or processed versions of this manual, if unaccompanied by
  26 the source, must acknowledge the copyright and authors of this work.
  27 */
  28
  29 /* { dg-require-effective-target sockets } */
  30 /* { dg-additional-options "-Wno-analyzer-too-complex" } */
  31 /* { dg-skip-if "" { powerpc*-*-aix* } } */
  32
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35 #include <netdb.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <string.h>
  40
  41 #define BUF_SIZE 500
  42
  43 int
  44 main(int argc, char *argv[])
  45 {
  46   struct addrinfo hints;
  47   struct addrinfo *result, *rp;
  48   int sfd, s;
  49   size_t len;
  50   ssize_t nread;
  51   char buf[BUF_SIZE];
  52
  53   if (argc < 3) {
  54     fprintf(stderr, "Usage: %s host port msg...\n", argv[0]);
  55     exit(EXIT_FAILURE);
  56   }
  57
  58   /* Obtain address(es) matching host/port. */
  59
  60   memset(&hints, 0, sizeof(hints));
  61   hints.ai_family = AF_UNSPEC;    /* Allow IPv4 or IPv6 */
  62   hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
  63   hints.ai_flags = 0;
  64   hints.ai_protocol = 0;          /* Any protocol */
  65
  66   s = getaddrinfo(argv[1], argv[2], &hints, &result);
  67   if (s != 0) {
  68     fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
  69     exit(EXIT_FAILURE);
  70   }
  71
  72   /* getaddrinfo() returns a list of address structures.
  73      Try each address until we successfully connect(2).
  74      If socket(2) (or connect(2)) fails, we (close the socket
  75      and) try the next address. */
  76
  77   for (rp = result; rp != NULL; rp = rp->ai_next) {
  78     sfd = socket(rp->ai_family, rp->ai_socktype,
  79                  rp->ai_protocol);
  80     if (sfd == -1)
  81       continue;
  82
  83     if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
  84       break;                  /* Success */
  85
  86     close(sfd);
  87   }
  88
  89   freeaddrinfo(result);           /* No longer needed */
  90
  91   if (rp == NULL) {               /* No address succeeded */
  92     fprintf(stderr, "Could not connect\n");
  93     exit(EXIT_FAILURE);
  94   }
  95
  96   /* Send remaining command-line arguments as separate
  97      datagrams, and read responses from server. */
  98
  99   for (int j = 3; j < argc; j++) {
 100     len = strlen(argv[j]) + 1;
 101     /* +1 for terminating null byte */
 102
 103     if (len > BUF_SIZE) {
 104       fprintf(stderr,
 105               "Ignoring long message in argument %d\n", j);
 106       continue;
 107     }
 108
 109     if (write(sfd, argv[j], len) != len) {
 110       fprintf(stderr, "partial/failed write\n");
 111       exit(EXIT_FAILURE);
 112     }
 113
 114     nread = read(sfd, buf, BUF_SIZE);
 115     if (nread == -1) {
 116       perror("read");
 117       exit(EXIT_FAILURE);
 118     }
 119
 120     printf("Received %zd bytes: %s\n", nread, buf);
 121   }
 122
 123   exit(EXIT_SUCCESS);
 124 }