The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/exec_conf.c

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    1 /*      $OpenBSD: exec_conf.c,v 1.38 2021/12/07 22:17:02 guenther Exp $ */
    2 /*      $NetBSD: exec_conf.c,v 1.16 1995/12/09 05:34:47 cgd Exp $       */
    3 
    4 /*
    5  * Copyright (c) 1993, 1994 Christopher G. Demetriou
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Christopher G. Demetriou.
   19  * 4. The name of the author may not be used to endorse or promote products
   20  *    derived from this software without specific prior written permission
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/exec.h>
   36 #include <sys/exec_script.h>
   37 #include <sys/exec_elf.h>
   38 
   39 const struct execsw execsw[] = {
   40         {       /* shell scripts */
   41                 .es_hdrsz = EXEC_SCRIPT_HDRSZ,
   42                 .es_check = exec_script_makecmds,
   43         },
   44         {       /* elf binaries */
   45                 .es_hdrsz = sizeof(Elf_Ehdr),
   46                 .es_check = exec_elf_makecmds,
   47         },
   48 };
   49 int nexecs = (sizeof execsw / sizeof(*execsw));
   50 int exec_maxhdrsz;
   51 
   52 void    init_exec(void);
   53 
   54 void
   55 init_exec(void)
   56 {
   57         int i;
   58 
   59         /*
   60          * figure out the maximum size of an exec header.
   61          */
   62         for (i = 0; i < nexecs; i++)
   63                 if (execsw[i].es_check != NULL &&
   64                     execsw[i].es_hdrsz > exec_maxhdrsz)
   65                         exec_maxhdrsz = execsw[i].es_hdrsz;
   66 }

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