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att
GitHub Repository: att/ast
 Path: blob/master/src/cmd/3d/dup3d.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1989-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Eduardo Krell <[email protected]>                   *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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#include "3d.h"

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#if FS

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int

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fs3d_dup(int ofd, int nfd)

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{

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	register Mount_t*	mp;

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	if (nfd >= 0 && ofd >= 0 && ofd < elementsof(state.file))

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	{

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		if (state.cache)

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		{

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			if (!(state.file[ofd].flags & FILE_OPEN))

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				fileinit(ofd, NiL, NiL, 0);

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			state.file[nfd] = state.file[ofd];

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			state.file[nfd].flags &= ~FILE_CLOEXEC;

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			state.file[nfd].reserved = 0;

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			if (nfd > state.cache)

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				state.cache = nfd;

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			if (nfd > state.open)

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				state.open = nfd;

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			if (mp = state.file[nfd].mount)

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				fscall(mp, MSG_dup, nfd, ofd);

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			for (mp = state.global; mp; mp = mp->global)

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				if (fssys(mp, MSG_dup))

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					fscall(mp, MSG_dup, nfd, ofd);

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		}

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#if defined(fchdir3d)

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		if (state.file[nfd].dir)

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		{

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			free(state.file[nfd].dir);

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			state.file[nfd].dir = 0;

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		}

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		if (state.file[ofd].dir && (state.file[nfd].dir = newof(0, Dir_t, 1, strlen(state.file[ofd].dir->path))))

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		{

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			strcpy(state.file[nfd].dir->path, state.file[ofd].dir->path);

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			state.file[nfd].dir->dev = state.file[ofd].dir->dev;

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			state.file[nfd].dir->ino = state.file[ofd].dir->ino;

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		}

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#endif

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	}

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	return 0;

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}

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#endif

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#ifdef dup3d

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int

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dup3d(int fd)

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{

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	register int	r;

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	initialize();

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	r = DUP(fd);

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#if FS

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	if (r >= 0 && r < elementsof(state.file))

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		fs3d_dup(fd, r);

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#endif

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	return r;

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}

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#else

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NoN(dup)

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#endif

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