71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/* Copyright (C) 1991, 1992 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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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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#include <hurd.h>
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/* Duplicate FD, returning a new file descriptor open on the same file. */
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int
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DEFUN(__dup, (fd), int fd)
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{
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int new;
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int dealloc, dealloc_ctty;
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io_t port, ctty;
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int flags;
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int dealloc_dt;
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struct _hurd_fd_user d;
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/* Extract the ports and flags from FD. */
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d = _hurd_fd (fd, &dealloc_dt);
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if (d.d == NULL)
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{
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badf:
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errno = EBADF;
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return -1;
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}
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flags = d.d->flags;
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ctty = _hurd_port_get (&d.d->ctty, &dealloc_ctty);
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port = _hurd_port_locked_get (&d.d->port, &dealloc); /* Unlocks D.d. */
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if (port == MACH_PORT_NULL)
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goto badf;
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/* Get a new descriptor. */
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new = _hurd_dalloc (port, ctty, flags);
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if (new >= 0)
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{
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/* Give the ports each a user ref for the new descriptor. */
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__mach_port_mod_refs (__mach_task_self (), port,
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MACH_PORT_RIGHT_SEND, 1);
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if (ctty != MACH_PORT_NULL)
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__mach_port_mod_refs (__mach_task_self (), ctty,
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MACH_PORT_RIGHT_SEND, 1);
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}
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_hurd_port_free (&d->port, port, &dealloc);
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if (ctty != MACH_PORT_NULL)
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_hurd_port_free (&d->ctty, ctty, &dealloc_ctty);
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_hurd_fd_done (d, &dealloc_dt);
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return new;
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}
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