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Annotation of src/lib/libc/gen/ftok.c, Revision 1.7

1.7     ! lukem       1: /*     $NetBSD: ftok.c,v 1.6 1998/11/12 16:15:17 christos 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:  * 3. The name of the author may not be used to endorse or promote products
                     16:  *    derived from this software without specific prior written permission.
                     17:  *
                     18:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     19:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     20:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     21:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
                     22:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
                     23:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
                     24:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
                     25:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
                     26:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
                     27:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     28:  */
1.2       jtc        29:
1.4       christos   30: #include <sys/cdefs.h>
1.2       jtc        31: #if defined(LIBC_SCCS) && !defined(lint)
1.7     ! lukem      32: __RCSID("$NetBSD: ftok.c,v 1.6 1998/11/12 16:15:17 christos Exp $");
1.2       jtc        33: #endif /* LIBC_SCCS and not lint */
1.1       jtc        34:
1.5       jtc        35: #include "namespace.h"
1.1       jtc        36: #include <sys/types.h>
                     37: #include <sys/stat.h>
                     38: #include <sys/ipc.h>
1.5       jtc        39:
1.7     ! lukem      40: #include <assert.h>
        !            41: #include <errno.h>
        !            42:
1.5       jtc        43: #ifdef __weak_alias
                     44: __weak_alias(ftok,_ftok);
                     45: #endif
1.1       jtc        46:
                     47: key_t
                     48: ftok(path, id)
                     49:        const char *path;
1.6       christos   50:        int id;
1.1       jtc        51: {
                     52:        struct stat st;
1.7     ! lukem      53:
        !            54:        _DIAGASSERT(path != NULL);
        !            55: #ifdef _DIAGNOSTIC
        !            56:        if (path == NULL || *path == '\0') {
        !            57:                errno = ENOENT;
        !            58:                return (key_t)-1;
        !            59:        }
        !            60: #endif
1.1       jtc        61:
                     62:        if (stat(path, &st) < 0)
                     63:                return (key_t)-1;
                     64:
1.3       cgd        65:        return (key_t)
                     66:            (id << 24 | (st.st_dev & 0xff) << 16 | (st.st_ino & 0xffff));
1.1       jtc        67: }