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/sys/exec.h

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    1 /*-
    2  * Copyright (c) 1992, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)exec.h      8.3 (Berkeley) 1/21/94
   35  * $FreeBSD$
   36  */
   37 
   38 #ifndef _SYS_EXEC_H_
   39 #define _SYS_EXEC_H_
   40 
   41 /*
   42  * The following structure is found at the top of the user stack of each
   43  * user process. The ps program uses it to locate argv and environment
   44  * strings. Programs that wish ps to display other information may modify
   45  * it; normally ps_argvstr points to the argv vector, and ps_nargvstr
   46  * is the same as the program's argc. The fields ps_envstr and ps_nenvstr
   47  * are the equivalent for the environment.
   48  */
   49 struct ps_strings {
   50         char    **ps_argvstr;   /* first of 0 or more argument strings */
   51         unsigned int ps_nargvstr; /* the number of argument strings */
   52         char    **ps_envstr;    /* first of 0 or more environment strings */
   53         unsigned int ps_nenvstr; /* the number of environment strings */
   54 };
   55 
   56 /*
   57  * Address of ps_strings structure (in user space).
   58  */
   59 #define PS_STRINGS      (USRSTACK - sizeof(struct ps_strings))
   60 #define SPARE_USRSPACE  4096
   61 
   62 struct image_params;
   63 
   64 struct execsw {
   65         int (*ex_imgact)(struct image_params *);
   66         const char *ex_name;
   67 };
   68 
   69 #include <machine/exec.h>
   70 
   71 #ifdef _KERNEL
   72 #include <sys/cdefs.h>
   73 
   74 int exec_map_first_page(struct image_params *);        
   75 void exec_unmap_first_page(struct image_params *);       
   76 
   77 int exec_register(const struct execsw *);
   78 int exec_unregister(const struct execsw *);
   79 
   80 /*
   81  * note: name##_mod cannot be const storage because the
   82  * linker_file_sysinit() function modifies _file in the
   83  * moduledata_t.
   84  */
   85 
   86 #include <sys/module.h>
   87 
   88 #define EXEC_SET(name, execsw_arg) \
   89         static int __CONCAT(name,_modevent)(module_t mod, int type, \
   90             void *data) \
   91         { \
   92                 struct execsw *exec = (struct execsw *)data; \
   93                 int error = 0; \
   94                 switch (type) { \
   95                 case MOD_LOAD: \
   96                         /* printf(#name " module loaded\n"); */ \
   97                         error = exec_register(exec); \
   98                         if (error) \
   99                                 printf(__XSTRING(name) "register failed\n"); \
  100                         break; \
  101                 case MOD_UNLOAD: \
  102                         /* printf(#name " module unloaded\n"); */ \
  103                         error = exec_unregister(exec); \
  104                         if (error) \
  105                                 printf(__XSTRING(name) " unregister failed\n");\
  106                         break; \
  107                 default: \
  108                         error = EOPNOTSUPP; \
  109                         break; \
  110                 } \
  111                 return error; \
  112         } \
  113         static moduledata_t __CONCAT(name,_mod) = { \
  114                 __XSTRING(name), \
  115                 __CONCAT(name,_modevent), \
  116                 (void *)& execsw_arg \
  117         }; \
  118         DECLARE_MODULE(name, __CONCAT(name,_mod), SI_SUB_EXEC, SI_ORDER_ANY)
  119 #endif
  120 
  121 #endif

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