diff options
Diffstat (limited to 'sysdeps/mach/hurd/dup3.c')
| -rw-r--r-- | sysdeps/mach/hurd/dup3.c | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/sysdeps/mach/hurd/dup3.c b/sysdeps/mach/hurd/dup3.c deleted file mode 100644 index 3ad325e49f..0000000000 --- a/sysdeps/mach/hurd/dup3.c +++ /dev/null @@ -1,139 +0,0 @@ -/* Duplicate a file descriptor to a given number, with flags. Hurd version. - Copyright (C) 1991-2017 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 - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; see the file COPYING.LIB. 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, and setting FD2's flags according to FLAGS. - Return FD2 or -1. */ -int -__dup3 (int fd, int fd2, int flags) -{ - struct hurd_fd *d; - - /* Both passing flags different from O_CLOEXEC and FD2 being the same as FD - are invalid. */ - if ((flags & ~O_CLOEXEC - || fd2 == fd) - /* ... with the exception in case that dup2 behavior is requested: if FD - is valid and FD2 is already the same then just return it. */ - && ! (flags == -1 - && fd2 == fd)) - return __hurd_fail (EINVAL); - - /* Extract the ports and flags from FD. */ - d = _hurd_fd_get (fd); - if (d == NULL) - return __hurd_fail (EBADF); - - HURD_CRITICAL_BEGIN; - - __spin_lock (&d->port.lock); - if (d->port.port == MACH_PORT_NULL) - { - __spin_unlock (&d->port.lock); - fd2 = __hurd_fail (EBADF); - } - else if (fd2 == fd) - __spin_unlock (&d->port.lock); - else - { - struct hurd_userlink ulink, ctty_ulink; - int d_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) - fd2 = __hurd_fail (EBADF); - else - { - /* Get a hold of the destination descriptor. */ - struct hurd_fd *d2; - - __mutex_lock (&_hurd_dtable_lock); - - 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); - 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); - } - } - __mutex_unlock (&_hurd_dtable_lock); - - 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); - if (flags & O_CLOEXEC) - d2->flags = d_flags | FD_CLOEXEC; - else - /* dup clears FD_CLOEXEC. */ - d2->flags = d_flags & ~FD_CLOEXEC; - _hurd_port_set (&d2->ctty, ctty); - _hurd_port_locked_set (&d2->port, port); /* Unlocks D2. */ - } - } - - _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; -} -libc_hidden_def (__dup3) -weak_alias (__dup3, dup3) |