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stcpopts.cc

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// This is neccessary to avoid muliple definitions of fd_set, etc when both
// RPC via PCNFS and Windows Sockets are to be available
#ifdef USE_PCNFS
#undef USE_PCNFS
#endif

#include "rcs_defs.hh"          /* _Windows, EXTERN_C_STD_HEADERS */
#include "stcpopts.hh"
#include "rcs_prnt.hh"          /* rcs_print_error()  */
#include "sokintrf.h"           // all the socket defs

#ifdef EXTERN_C_STD_HEADERS
extern "C"
{
#endif

#include <string.h>             /* strerror() */
#ifdef CenterLine
  char *strerror (int errnum);
#endif
#include <errno.h>              /* errno */

#ifndef VXWORKS
#include <fcntl.h>              /* fcntl(), O_NDELAY, F_SETFL */
#endif


#ifdef UNIX_LIKE_PLAT
#include <netinet/tcp.h>        // TCP_NODELAY
#endif

#ifdef VXWORKS
#include <netinet/tcp.h>        // TCP_NODELAY
#endif

#ifdef EXTERN_C_STD_HEADERS
}
#endif

int stcp_nonblocking = 1;

int RCS_EXPORT
set_stcp_socket_options (int socket_fd)
{
  if (socket_fd <= 0)
    {
      return -1;
    }
  int optval = 1;
#if defined(_Windows) || !defined(MSDOS)
  if (dl_setsockopt (socket_fd, IPPROTO_TCP, TCP_NODELAY,
                     (char *) &optval, sizeof (optval)) < 0)
    {
      rcs_print_error (" Can`t set a socket option.\n");
      rcs_print_error ("errno = %d = %s\n", errno, strerror (errno));
      return -1;
    }
#endif
  optval = 1;

#if !defined(MSDOS) || defined(_Windows)
  if (dl_setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR,
                     (char *) &optval, sizeof (optval)) < 0)
    {
      rcs_print_error (" Can`t set a socket option.\n");
      rcs_print_error ("errno = %d = %s\n", errno, strerror (errno));
      return -1;
    }
  struct linger linger_opt;
  linger_opt.l_onoff = 0;
  linger_opt.l_linger = 0;
  if (dl_setsockopt (socket_fd, SOL_SOCKET, SO_LINGER,
                     (char *) &linger_opt, sizeof (linger_opt)) < 0)
    {
      rcs_print_error (" Can`t set a socket option.\n");
      rcs_print_error ("errno = %d = %s\n", errno, strerror (errno));
      return -1;
    }
#endif

  if (stcp_nonblocking)
    {
#ifdef _Windows
      unsigned long arg = 1;
      if (dl_ioctlsocket (socket_fd, FIONBIO, &arg) < 0)
        {
          rcs_print_error ("Can't set  socket to non-blocking.");
        }
#else
#ifndef VXWORKS
#if defined(O_NDELAY) && !defined(O_NONBLOCK)
      if (-1 == fcntl (socket_fd, F_SETFL, O_NDELAY))
        {
          rcs_print_error ("Couldn's set flag for no delay on socket.\n");
        }
#endif
#ifdef O_NONBLOCK
      if (-1 == fcntl (socket_fd, F_SETFL, O_NONBLOCK))
        {
          rcs_print_error ("Couldn's set flag for non-blocking on socket.\n");
        }
#endif
#endif
#endif
    }
  return (0);
}

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