c_cpp/etc/calc/have_uid_t.c

   1 /*
   2  * have_uid_t - Determine if we want or can support uid_t
   3  *
   4  * Copyright (C) 1999  Landon Curt Noll
   5  *
   6  * Calc is open software; you can redistribute it and/or modify it under
   7  * the terms of the version 2.1 of the GNU Lesser General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  * Calc is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
  13  * Public License for more details.
  14  *
  15  * A copy of version 2.1 of the GNU Lesser General Public License is
  16  * distributed with calc under the filename COPYING-LGPL.  You should have
  17  * received a copy with calc; if not, write to Free Software Foundation, Inc.
  18  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  * @(#) $Revision: 30.1 $
  21  * @(#) $Id: have_uid_t.c,v 30.1 2007/03/16 11:09:46 chongo Exp $
  22  * @(#) $Source: /usr/local/src/bin/calc/RCS/have_uid_t.c,v $
  23  *
  24  * Under source code control:   1995/05/02 03:03:24
  25  * File existed as early as:    1995
  26  *
  27  * chongo <was here> /\oo/\     http://www.isthe.com/chongo/
  28  * Share and enjoy!  :-)        http://www.isthe.com/chongo/tech/comp/calc/
  29  */
  30
  31 /*
  32  * usage:
  33  *      have_uid_t
  34  *
  35  * Not all compilers support uid_t, so this may not compile on your system.
  36  *
  37  * This prog outputs several defines:
  38  *
  39  *      HAVE_UID_T
  40  *              defined ==> ok to use uid_t
  41  *              undefined ==> do not use uid_t
  42  */
  43
  44
  45 #include <stdio.h>
  46
  47 #if !defined(HAVE_NO_UID_T)
  48 #include "have_unistd.h"
  49 #if defined(HAVE_UNISTD_H)
  50 #include <unistd.h>
  51 #endif
  52 #include <pwd.h>
  53 #include <sys/types.h>
  54 #endif /* ! HAVE_NO_UID_T */
  55
  56 int
  57 main(void)
  58 {
  59 #if defined(HAVE_NO_UID_T)
  60
  61         printf("#undef HAVE_UID_T /* no */\n");
  62
  63 #else /* HAVE_NO_UID_T */
  64
  65         uid_t curds;
  66         extern uid_t geteuid();
  67
  68         curds = geteuid();
  69
  70         printf("#define HAVE_UID_T /* yes */\n");
  71
  72 #endif /* HAVE_NO_UID_T */
  73
  74         /* exit(0); */
  75         return 0;
  76 }