111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/* $NetBSD: getdevmajor.c,v 1.6 2012/03/13 21:13:35 christos Exp $ */
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/*-
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* Copyright (c) 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Brown.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: getdevmajor.c,v 1.6 2012/03/13 21:13:35 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef __weak_alias
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__weak_alias(getdevmajor,_getdevmajor)
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#endif
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/*
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* XXX temporary alias because getdevmajor() was renamed
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* in -current for some time
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*/
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dev_t __getdevmajor50(const char *, mode_t);
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dev_t
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__getdevmajor50(const char *name, mode_t type)
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{
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return (dev_t)getdevmajor(name, type);
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}
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devmajor_t
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getdevmajor(const char *name, mode_t type)
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{
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struct kinfo_drivers kd[200], *kdp = &kd[0];
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size_t i, sz = sizeof(kd);
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int rc;
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devmajor_t n = NODEVMAJOR;
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if (type != S_IFCHR && type != S_IFBLK) {
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errno = EINVAL;
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return n;
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}
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do {
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rc = sysctlbyname("kern.drivers", kdp, &sz, NULL, 0);
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if (rc == -1) {
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if (errno != ENOMEM)
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goto out;
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if (kdp != &kd[0])
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free(kdp);
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if ((kdp = malloc(sz)) == NULL)
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return n;
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}
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} while (rc == -1);
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sz /= sizeof(*kdp);
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for (i = 0; i < sz; i++) {
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if (strcmp(name, kdp[i].d_name) == 0) {
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if (type == S_IFCHR)
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n = kdp[i].d_cmajor;
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else
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n = kdp[i].d_bmajor;
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break;
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}
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}
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if (i >= sz)
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errno = ENOENT;
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out:
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if (kdp != &kd[0])
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free(kdp);
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return n;
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}
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