lib/libc/gen/getbootfile.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)gethostname.c    8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/gen/getbootfile.c,v 1.5 1999/08/27 23:58:37 peter Exp $
  31  * $DragonFly: src/lib/libc/gen/getbootfile.c,v 1.4 2008/09/02 11:50:46 matthias Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/sysctl.h>
  36 #include <paths.h>
  37
  38 const char *
  39 getbootfile(void)
  40 {
  41         static char name[MAXPATHLEN];
  42         size_t size = sizeof name;
  43         int mib[2];
  44
  45         mib[0] = CTL_KERN;
  46         mib[1] = KERN_BOOTFILE;
  47         if (sysctl(mib, 2, name, &size, NULL, 0) == -1)
  48                 return ("/boot/kernel");
  49         return (name);
  50 }