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/* Lookup helper function for Hurd implementation of *at functions.
Copyright (C) 2006-2025 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; if not, see
<https://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/lookup.h>
#include <hurd/fd.h>
#include <string.h>
#include <fcntl.h>
file_t
__file_name_lookup_at (int fd, int at_flags,
const char *file_name, int flags, mode_t mode)
{
error_t err;
file_t result;
int empty = at_flags & AT_EMPTY_PATH;
int orig_flags;
at_flags &= ~AT_EMPTY_PATH;
err = __hurd_at_flags (&at_flags, &flags);
if (err)
return (__hurd_fail (err), MACH_PORT_NULL);
if (empty != 0 && file_name[0] == '\0')
{
enum retry_type doretry;
char retryname[1024]; /* XXX string_t LOSES! */
err = HURD_DPORT_USE (fd, __dir_lookup (port, "", flags, mode,
&doretry, retryname,
&result));
if (! err)
err = __hurd_file_name_lookup_retry (&_hurd_ports_use, &__getdport,
NULL, doretry, retryname,
flags, mode, &result);
return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
}
orig_flags = flags;
if (flags & O_TMPFILE)
flags = O_DIRECTORY;
if (fd == AT_FDCWD || file_name[0] == '/')
{
err = __hurd_file_name_lookup (&_hurd_ports_use, &__getdport, 0,
file_name, flags, mode & ~_hurd_umask,
&result);
if (err)
{
__hurd_fail (err);
return MACH_PORT_NULL;
}
}
else
{
file_t startdir;
/* We need to look the file up relative to the given directory (and
not our cwd). For this to work, we supply our own wrapper for
_hurd_ports_use, which replaces cwd with our startdir. */
error_t use_init_port (int which, error_t (*operate) (mach_port_t))
{
return (which == INIT_PORT_CWDIR ? (*operate) (startdir)
: _hurd_ports_use (which, operate));
}
err = HURD_DPORT_USE (fd, (startdir = port,
__hurd_file_name_lookup (&use_init_port,
&__getdport, NULL,
file_name,
flags,
mode & ~_hurd_umask,
&result)));
if (err)
{
__hurd_dfail (fd, err);
return MACH_PORT_NULL;
}
}
if (orig_flags & O_TMPFILE)
{
/* What we have looked up is not the file itself, but actually
the directory to create the file in. Do that now. */
file_t dir = result;
err = __dir_mkfile (dir, orig_flags & ~(O_TMPFILE | O_DIRECTORY),
mode, &result);
__mach_port_deallocate (__mach_task_self (), dir);
if (err)
{
__hurd_fail (err);
return MACH_PORT_NULL;
}
}
return result;
}
file_t
__file_name_split_at (int fd, const char *file_name, char **name)
{
error_t err;
file_t result;
if (fd == AT_FDCWD || file_name[0] == '/')
return __file_name_split (file_name, name);
err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
file_name, &result, name);
file_t startdir;
error_t use_init_port (int which, error_t (*operate) (mach_port_t))
{
return (which == INIT_PORT_CWDIR ? (*operate) (startdir)
: _hurd_ports_use (which, operate));
}
err = HURD_DPORT_USE (fd, (startdir = port,
__hurd_file_name_split (&use_init_port,
&__getdport, 0,
file_name,
&result, name)));
return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
}
file_t
__directory_name_split_at (int fd, const char *directory_name, char **name)
{
error_t err;
file_t result;
if (fd == AT_FDCWD || directory_name[0] == '/')
return __directory_name_split (directory_name, name);
file_t startdir;
error_t use_init_port (int which, error_t (*operate) (mach_port_t))
{
return (which == INIT_PORT_CWDIR ? (*operate) (startdir)
: _hurd_ports_use (which, operate));
}
err = HURD_DPORT_USE (fd, (startdir = port,
__hurd_directory_name_split (&use_init_port,
&__getdport, 0,
directory_name,
&result, name)));
return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
}
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