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47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
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open the same file as FD is. Return FD2 or -1. */
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int
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__dup2 (fd, fd2)
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int fd;
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int fd2;
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{
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if (fd < 0 || fd2 < 0)
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{
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__set_errno (EBADF);
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return -1;
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}
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if (fd == fd2)
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/* No way to check that they are valid. */
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return fd2;
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__set_errno (ENOSYS);
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return -1;
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}
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libc_hidden_def (__dup2)
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stub_warning (dup2)
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weak_alias (__dup2, dup2)
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