Annotation of src/lib/libc/gen/ftok.c, Revision 1.10
1.10 ! hubertf 1: /* $NetBSD: ftok.c,v 1.9 2000/01/22 22:19:10 mycroft Exp $ */
1.3 cgd 2:
1.1 jtc 3: /*
4: * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
1.2 jtc 27:
1.4 christos 28: #include <sys/cdefs.h>
1.2 jtc 29: #if defined(LIBC_SCCS) && !defined(lint)
1.10 ! hubertf 30: __RCSID("$NetBSD: ftok.c,v 1.9 2000/01/22 22:19:10 mycroft Exp $");
1.2 jtc 31: #endif /* LIBC_SCCS and not lint */
1.1 jtc 32:
1.5 jtc 33: #include "namespace.h"
1.1 jtc 34: #include <sys/types.h>
35: #include <sys/stat.h>
36: #include <sys/ipc.h>
1.5 jtc 37:
1.7 lukem 38: #include <assert.h>
39: #include <errno.h>
40:
1.5 jtc 41: #ifdef __weak_alias
1.9 mycroft 42: __weak_alias(ftok,_ftok)
1.5 jtc 43: #endif
1.1 jtc 44:
45: key_t
46: ftok(path, id)
47: const char *path;
1.6 christos 48: int id;
1.1 jtc 49: {
50: struct stat st;
1.7 lukem 51:
52: _DIAGASSERT(path != NULL);
1.1 jtc 53:
54: if (stat(path, &st) < 0)
55: return (key_t)-1;
56:
1.3 cgd 57: return (key_t)
58: (id << 24 | (st.st_dev & 0xff) << 16 | (st.st_ino & 0xffff));
1.1 jtc 59: }
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