Back to index

glibc  2.9
dup3.c
Go to the documentation of this file.
00001 /* Copyright (C) 2008 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <fcntl.h>
00021 #include <unistd.h>
00022 
00023 
00024 /* Duplicate FD to FD2, closing the old FD2 and making FD2 be
00025    open the same file as FD is which setting flags according to
00026    FLAGS.  Return FD2 or -1.  */
00027 int
00028 dup3 (fd, fd2, flags)
00029      int fd;
00030      int fd2;
00031      int flags;
00032 {
00033   if (fd < 0 || fd2 < 0)
00034     {
00035       __set_errno (EBADF);
00036       return -1;
00037     }
00038 
00039   if (fd == fd2)
00040     /* No way to check that they are valid.  */
00041     return fd2;
00042 
00043   __set_errno (ENOSYS);
00044   return -1;
00045 }
00046 stub_warning (dup3)
00047 
00048 #include <stub-tag.h>