gcc/testsuite/c-c++-common/analyzer/fd-glibc-byte-stream-socket.c

/* Example from glibc manual (16.9.6).  */
/* { dg-require-effective-target sockets } */

/* Needed on some targets until we have exception-handling working (PR 111475).  */
/* { dg-additional-options "-fno-exceptions" } */

/* { dg-skip-if "" { hppa*-*-hpux* powerpc*-*-aix* } } */
/* On vxworks, netinet/in.h indirectly includes atomic, that requires C++11.  */
/* { dg-skip-if "" { *-*-vxworks* && { c++ && { ! c++11 } } } } */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#define PORT            5555
#define MESSAGE         "Yow!!! Are we having fun yet?!?"
#define SERVERHOST      "www.gnu.org"

void
write_to_server (int filedes)
{
  int nbytes;

  nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1);
  if (nbytes < 0)
    {
      perror ("write");
      exit (EXIT_FAILURE);
    }
}


int
main (void)
{
  extern void init_sockaddr (struct sockaddr_in *name,
                             const char *hostname,
                             uint16_t port);
  int sock;
  struct sockaddr_in servername;

  /* Create the socket. */
  sock = socket (PF_INET, SOCK_STREAM, 0);
  if (sock < 0)
    {
      perror ("socket (client)");
      exit (EXIT_FAILURE);
    }

  /* Connect to the server. */
  init_sockaddr (&servername, SERVERHOST, PORT);
  if (0 > connect (sock,
                   (struct sockaddr *) &servername,
                   sizeof (servername)))
    {
      perror ("connect (client)");
      exit (EXIT_FAILURE);
    }

  /* Send data to the server. */
  write_to_server (sock);
  close (sock);
  exit (EXIT_SUCCESS);
}