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https://github.com/adtools/clib2.git
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f2d1a3238d
buffer tables so that all the memory allocations are in one place and it's possible to specify exactly how many table entries are required at a time. - Creation and initialization of semaphores now uses the AmigaOS4 specific functions for this purpose, if available. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14857 87f5fb63-7c3d-0410-a384-fd976d0f7a62
130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/*
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* $Id: unistd_dup2.c,v 1.8 2005-03-04 09:07:09 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _UNISTD_HEADERS_H
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#include "unistd_headers.h"
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#endif /* _UNISTD_HEADERS_H */
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/****************************************************************************/
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/* The following is not part of the ISO 'C' (1994) standard. */
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/****************************************************************************/
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int
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dup2(int file_descriptor1, int file_descriptor2)
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{
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struct fd * fd1;
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int result = -1;
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ENTER();
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SHOWVALUE(file_descriptor1);
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SHOWVALUE(file_descriptor2);
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if(__check_abort_enabled)
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__check_abort();
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__stdio_lock();
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assert( file_descriptor1 >= 0 && file_descriptor1 < __num_fd );
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assert( __fd[file_descriptor1] != NULL );
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assert( FLAG_IS_SET(__fd[file_descriptor1]->fd_Flags,FDF_IN_USE) );
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fd1 = __get_file_descriptor(file_descriptor1);
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if(fd1 == NULL)
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{
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__set_errno(EBADF);
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goto out;
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}
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if(file_descriptor2 < 0)
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{
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/* Try to find a place to put the duplicate into. */
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file_descriptor2 = __find_vacant_fd_entry();
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if(file_descriptor2 < 0)
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{
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/* No free space, so let's grow the table. */
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if(__grow_fd_table(0) < 0)
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{
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SHOWMSG("not enough memory for new file descriptor");
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goto out;
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}
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file_descriptor2 = __find_vacant_fd_entry();
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assert( file_descriptor2 >= 0 );
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}
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}
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else if (file_descriptor1 != file_descriptor2)
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{
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/* Make sure the requested duplicate exists. */
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if(__grow_fd_table(file_descriptor2 + 1) < 0)
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goto out;
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assert( file_descriptor2 >= 0 && file_descriptor2 < __num_fd );
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assert( __fd[file_descriptor2] != NULL );
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}
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if(file_descriptor1 != file_descriptor2)
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{
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struct fd * fd2;
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/* Have a look at the requested file descriptor. */
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assert( 0 <= file_descriptor2 && file_descriptor2 < __num_fd );
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fd2 = __fd[file_descriptor2];
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assert( fd2 != NULL );
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/* Make sure that the entry is cleaned up before we used it. */
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if(FLAG_IS_SET(fd2->fd_Flags,FDF_IN_USE))
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{
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SHOWMSG("closing file descriptor #2");
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if(close(file_descriptor2) < 0)
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goto out;
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}
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__duplicate_fd(fd2,fd1);
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}
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result = file_descriptor2;
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out:
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__stdio_unlock();
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RETURN(result);
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return(result);
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}
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