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68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/* Make a link between file names relative to open directories. Hurd version.
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Copyright (C) 2006,2010 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <hurd.h>
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#include <hurd/fd.h>
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/* Make a link to FROM relative to FROMFD called TO relative to TOFD. */
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int
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linkat (fromfd, from, tofd, to, flags)
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int fromfd;
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const char *from;
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int tofd;
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const char *to;
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int flags;
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{
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error_t err;
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file_t oldfile, linknode, todir;
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char *toname;
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/* POSIX says linkat doesn't follow symlinks by default, so pass
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O_NOLINK. That can be overridden by AT_SYMLINK_FOLLOW in FLAGS. */
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oldfile = __file_name_lookup_at (fromfd, flags, from, O_NOLINK, 0);
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if (oldfile == MACH_PORT_NULL)
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return -1;
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/* The file_getlinknode RPC returns the port that should be passed to
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the receiving filesystem (the one containing TODIR) in dir_link. */
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err = __file_getlinknode (oldfile, &linknode);
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__mach_port_deallocate (__mach_task_self (), oldfile);
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if (err)
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return __hurd_fail (err);
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todir = __file_name_split_at (tofd, to, &toname);
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if (todir != MACH_PORT_NULL)
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{
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err = __dir_link (todir, linknode, toname, 1);
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__mach_port_deallocate (__mach_task_self (), todir);
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}
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__mach_port_deallocate (__mach_task_self (), linknode);
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if (todir == MACH_PORT_NULL)
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return -1;
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if (err)
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return __hurd_fail (err);
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return 0;
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}
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