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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1992, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)exec.h      8.3 (Berkeley) 1/21/94
   37  * $FreeBSD: stable/12/sys/sys/exec.h 326023 2017-11-20 19:43:44Z pfg $
   38  */
   39 
   40 #ifndef _SYS_EXEC_H_
   41 #define _SYS_EXEC_H_
   42 
   43 /*
   44  * Before ps_args existed, the following structure, found at the top of
   45  * the user stack of each user process, was used by ps(1) to locate
   46  * environment and argv strings.  Normally ps_argvstr points to the
   47  * argv vector, and ps_nargvstr is the same as the program's argc. The
   48  * fields ps_envstr and ps_nenvstr are the equivalent for the environment.
   49  *
   50  * Programs should now use setproctitle(3) to change ps output.
   51  * setproctitle() always informs the kernel with sysctl and sets the
   52  * pointers in ps_strings.  The kern.proc.args sysctl first tries p_args.
   53  * If p_args is NULL, it then falls back to reading ps_strings and following
   54  * the pointers.
   55  */
   56 struct ps_strings {
   57         char    **ps_argvstr;   /* first of 0 or more argument strings */
   58         unsigned int ps_nargvstr; /* the number of argument strings */
   59         char    **ps_envstr;    /* first of 0 or more environment strings */
   60         unsigned int ps_nenvstr; /* the number of environment strings */
   61 };
   62 
   63 struct image_params;
   64 
   65 struct execsw {
   66         int (*ex_imgact)(struct image_params *);
   67         const char *ex_name;
   68 };
   69 
   70 #include <machine/exec.h>
   71 
   72 #ifdef _KERNEL
   73 #include <sys/cdefs.h>
   74 
   75 /*
   76  * Address of ps_strings structure (in user space).
   77  * Prefer the kern.ps_strings or kern.proc.ps_strings sysctls to this constant.
   78  */
   79 #define PS_STRINGS      (USRSTACK - sizeof(struct ps_strings))
   80 #define SPARE_USRSPACE  4096
   81 
   82 int exec_map_first_page(struct image_params *);        
   83 void exec_unmap_first_page(struct image_params *);       
   84 
   85 int exec_register(const struct execsw *);
   86 int exec_unregister(const struct execsw *);
   87 
   88 extern int coredump_pack_fileinfo;
   89 extern int coredump_pack_vmmapinfo;
   90 
   91 /*
   92  * note: name##_mod cannot be const storage because the
   93  * linker_file_sysinit() function modifies _file in the
   94  * moduledata_t.
   95  */
   96 
   97 #include <sys/module.h>
   98 
   99 #define EXEC_SET(name, execsw_arg) \
  100         static int __CONCAT(name,_modevent)(module_t mod, int type, \
  101             void *data) \
  102         { \
  103                 struct execsw *exec = (struct execsw *)data; \
  104                 int error = 0; \
  105                 switch (type) { \
  106                 case MOD_LOAD: \
  107                         /* printf(#name " module loaded\n"); */ \
  108                         error = exec_register(exec); \
  109                         if (error) \
  110                                 printf(__XSTRING(name) "register failed\n"); \
  111                         break; \
  112                 case MOD_UNLOAD: \
  113                         /* printf(#name " module unloaded\n"); */ \
  114                         error = exec_unregister(exec); \
  115                         if (error) \
  116                                 printf(__XSTRING(name) " unregister failed\n");\
  117                         break; \
  118                 default: \
  119                         error = EOPNOTSUPP; \
  120                         break; \
  121                 } \
  122                 return error; \
  123         } \
  124         static moduledata_t __CONCAT(name,_mod) = { \
  125                 __XSTRING(name), \
  126                 __CONCAT(name,_modevent), \
  127                 (void *)& execsw_arg \
  128         }; \
  129         DECLARE_MODULE_TIED(name, __CONCAT(name,_mod), SI_SUB_EXEC, \
  130             SI_ORDER_ANY)
  131 #endif
  132 
  133 #endif

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