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peek.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1989-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Eduardo Krell <ekrell@adexus.cl>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <sys/types.h>

#if _stream_peek
#include <ast_tty.h>
#include <stropts.h>
#endif

#if _socket_peek
#include <sys/socket.h>
#endif

int
main()
{
      int         fds[2];
      static char msg[] = "test";
#if _stream_peek
      struct strpeek    pk;
#endif

      if (pipe(fds) || write(fds[1], msg, sizeof(msg)) != sizeof(msg))
            return(0);
#if _stream_peek
      pk.flags = 0;
      pk.ctlbuf.maxlen = -1;
      pk.ctlbuf.len = 0;
      pk.ctlbuf.buf = 0;
      pk.databuf.maxlen = sizeof(msg);
      pk.databuf.buf = msg;
      pk.databuf.len = 0;
      if (ioctl(fds[0], I_PEEK, &pk) > 0 && pk.databuf.len == sizeof(msg))
      {
            printf("#undef    _socket_peek\n");
            return(0);
      }
#endif
#if _socket_peek
      if (recv(fds[0], msg, sizeof(msg), MSG_PEEK) == sizeof(msg))
      {
            printf("#undef    _stream_peek\n");
            return(0);
      }
#endif
      return(0);
}

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