usr/src/lib/libast/common/comp/fcntl.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 /*
  25  * -last fcntl
  26  */
  27
  28 #include <ast.h>
  29
  30 #ifndef fcntl
  31
  32 NoN(fcntl)
  33
  34 #else
  35
  36 #include <ls.h>
  37 #include <ast_tty.h>
  38 #include <error.h>
  39
  40 #if F_SETFD >= _ast_F_LOCAL
  41 #if _sys_filio
  42 #include <sys/filio.h>
  43 #endif
  44 #endif
  45
  46 #if _lib_fcntl
  47 #undef  fcntl
  48 extern int      fcntl(int, int, ...);
  49 #endif
  50
  51 int
  52 _ast_fcntl(int fd, int op, ...)
  53 {
  54         int             n;
  55         int             save_errno;
  56         struct stat     st;
  57         va_list         ap;
  58
  59         save_errno = errno;
  60         va_start(ap, op);
  61         if (op >= _ast_F_LOCAL) switch (op)
  62         {
  63 #if F_DUPFD >= _ast_F_LOCAL
  64         case F_DUPFD:
  65                 n = va_arg(ap, int);
  66                 op = dup2(fd, n);
  67                 break;
  68 #endif
  69 #if F_GETFL >= _ast_F_LOCAL
  70         case F_GETFL:
  71                 op = fstat(fd, &st);
  72                 break;
  73 #endif
  74 #if F_SETFD >= _ast_F_LOCAL && defined(FIOCLEX)
  75         case F_SETFD:
  76                 n = va_arg(ap, int);
  77                 op = ioctl(fd, n == FD_CLOEXEC ? FIOCLEX : FIONCLEX, 0);
  78                 break;
  79 #endif
  80         default:
  81                 errno = EINVAL;
  82                 op = -1;
  83                 break;
  84         }
  85         else
  86 #if _lib_fcntl
  87         op = fcntl(fd, op, va_arg(ap, int));
  88 #else
  89         {
  90                 errno = EINVAL;
  91                 op = -1;
  92         }
  93 #endif
  94         va_end(ap);
  95         return(op);
  96 }
  97
  98 #endif