94b7cc3711
fopen should set the FD_CLOEXEC flag if requested evenif the kernel does not support an aotmic operation. freopen should reuse the file descriptor for the stream. This is especially important for calls to change the standard streams (stin, stdout, stderr).
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* Copyright (C) 2008, 2011 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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 which setting flags according to
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FLAGS. Return FD2 or -1. */
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int
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dup3 (fd, fd2, flags)
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int fd;
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int fd2;
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int flags;
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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 (dup3)
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stub_warning (dup3)
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#include <stub-tag.h>
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