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Hurd: dup3

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This commit is contained in:
Thomas Schwinge
2012-05-10 13:15:40 -07:00
committed by Roland McGrath
parent cd9fa98583
commit 5aa3a74a59
5 changed files with 163 additions and 117 deletions
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114
sysdeps/mach/hurd/dup2.c
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@@ -1,4 +1,5 @@
/* Copyright (C) 1991, 92, 93, 94, 95, 97, 2002 Free Software Foundation, Inc.
/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -15,119 +16,20 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/fd.h>
/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
open on the same file as FD is. Return FD2 or -1. */
int
__dup2 (fd, fd2)
int fd;
int fd2;
__dup2 (int fd, int fd2)
{
struct hurd_fd *d;
int flags = 0;
/* Extract the ports and flags from FD. */
d = _hurd_fd_get (fd);
if (d == NULL)
{
errno = EBADF;
return -1;
}
if (fd2 == fd)
/* See the comment in dup3. */
flags = -1;
HURD_CRITICAL_BEGIN;
__spin_lock (&d->port.lock);
if (d->port.port == MACH_PORT_NULL)
{
__spin_unlock (&d->port.lock);
errno = EBADF;
fd2 = -1;
}
else if (fd2 == fd)
/* FD is valid and FD2 is already the same; just return it. */
__spin_unlock (&d->port.lock);
else
{
struct hurd_userlink ulink, ctty_ulink;
int flags = d->flags;
io_t ctty = _hurd_port_get (&d->ctty, &ctty_ulink);
io_t port = _hurd_port_locked_get (&d->port, &ulink); /* Unlocks D. */
if (fd2 < 0)
{
errno = EBADF;
fd2 = -1;
}
else
{
/* Get a hold of the destination descriptor. */
struct hurd_fd *d2;
if (fd2 >= _hurd_dtablesize)
{
/* The table is not large enough to hold the destination
descriptor. Enlarge it as necessary to allocate this
descriptor. */
__mutex_unlock (&_hurd_dtable_lock);
/* We still hold FD1's lock, but this is safe because
_hurd_alloc_fd will only examine the cells starting
at FD2. */
d2 = _hurd_alloc_fd (NULL, fd2);
if (d2)
__spin_unlock (&d2->port.lock);
__mutex_lock (&_hurd_dtable_lock);
}
else
{
d2 = _hurd_dtable[fd2];
if (d2 == NULL)
{
/* Must allocate a new one. We don't initialize the port
cells with this call so that if it fails (out of
memory), we will not have already added user
references for the ports, which we would then have to
deallocate. */
d2 = _hurd_dtable[fd2] = _hurd_new_fd (MACH_PORT_NULL,
MACH_PORT_NULL);
}
}
if (d2 == NULL)
{
fd2 = -1;
if (errno == EINVAL)
errno = EBADF; /* POSIX.1-1990 6.2.1.2 ll 54-55. */
}
else
{
/* Give the ports each a user ref for the new descriptor. */
__mach_port_mod_refs (__mach_task_self (), port,
MACH_PORT_RIGHT_SEND, 1);
if (ctty != MACH_PORT_NULL)
__mach_port_mod_refs (__mach_task_self (), ctty,
MACH_PORT_RIGHT_SEND, 1);
/* Install the ports and flags in the new descriptor slot. */
__spin_lock (&d2->port.lock);
d2->flags = flags & ~FD_CLOEXEC; /* Dup clears FD_CLOEXEC. */
_hurd_port_set (&d2->ctty, ctty);
_hurd_port_locked_set (&d2->port, port); /* Unlocks D2. */
}
}
__mutex_unlock (&_hurd_dtable_lock);
_hurd_port_free (&d->port, &ulink, port);
if (ctty != MACH_PORT_NULL)
_hurd_port_free (&d->ctty, &ctty_ulink, port);
}
HURD_CRITICAL_END;
return fd2;
return __dup3 (fd, fd2, flags);
}
libc_hidden_def (__dup2)
weak_alias (__dup2, dup2)