FreeBSD/Linux Kernel Cross Reference
sys/sys/exec.h

     /*-
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)exec.h      8.3 (Berkeley) 1/21/94
     * $FreeBSD: src/sys/sys/exec.h,v 1.26 1999/12/29 04:24:40 peter Exp $
     * $DragonFly: src/sys/sys/exec.h,v 1.5 2006/12/23 00:27:03 swildner Exp $
     */
    
    #ifndef _SYS_EXEC_H_
    #define _SYS_EXEC_H_
    
    /*
     * The following structure is found at the top of the user stack of each
     * user process. The ps program uses it to locate argv and environment
     * strings. Programs that wish ps to display other information may modify
     * it; normally ps_argvstr points to the argv vector, and ps_nargvstr
     * is the same as the program's argc. The fields ps_envstr and ps_nenvstr
     * are the equivalent for the environment.
     */
    struct ps_strings {
            char    **ps_argvstr;   /* first of 0 or more argument strings */
            int     ps_nargvstr;    /* the number of argument strings */
            char    **ps_envstr;    /* first of 0 or more environment strings */
            int     ps_nenvstr;     /* the number of environment strings */
    };
    
    /*
     * Address of ps_strings structure (in user space).
     */
    #define PS_STRINGS      (USRSTACK - sizeof(struct ps_strings))
    #define SPARE_USRSPACE  256
    
    struct image_params;
    
    struct execsw {
            int (*ex_imgact) (struct image_params *);
            const char *ex_name;
    };
    
    #include <machine/exec.h>
    
    #ifdef _KERNEL
    #include <sys/cdefs.h>
    
    struct lwbuf;
    int exec_map_page(struct image_params *, vm_pindex_t, struct lwbuf **,
                      const char **);
    void exec_unmap_page(struct lwbuf *);
    int exec_map_first_page (struct image_params *);        
    void exec_unmap_first_page (struct image_params *);       
    
    int exec_register (const struct execsw *);
    int exec_unregister (const struct execsw *);
    
    /*
     * note: name##_mod cannot be const storage because the
     * linker_file_sysinit() function modifies _file in the
     * moduledata_t.
     */
    
    #include <sys/module.h>
    
    #define DEFINE_EXEC_MODULE(name, execsw_arg) \
            static int name ## _modevent(module_t mod, int type, void *data) \
            { \
                   struct execsw *exec = (struct execsw *)data; \
                   int error = 0; \
                   switch (type) { \
                   case MOD_LOAD: \
                           /* kprintf(#name " module loaded\n"); */ \
                           error = exec_register(exec); \
                           if (error) \
                                   kprintf(#name "register failed\n"); \
                           break; \
                   case MOD_UNLOAD: \
                           /* kprintf(#name " module unloaded\n"); */ \
                           error = exec_unregister(exec); \
                           if (error) \
                                   kprintf(#name " unregister failed\n"); \
                           break; \
                   default: \
                           break; \
                   } \
                   return error; \
           } \
           static moduledata_t name ## _mod = { \
                   #name, \
                   name ## _modevent, \
                   (void *)& execsw_arg \
           };
   
   #define EXEC_SET_ORDERED(name, execsw_arg, order)                       \
           DEFINE_EXEC_MODULE(name, execsw_arg)                            \
           DECLARE_MODULE(name, name ## _mod, SI_SUB_EXEC, order)
   
   #define EXEC_SET(name, execsw_arg)                                      \
           EXEC_SET_ORDERED(name, execsw_arg, SI_ORDER_ANY)
   
   #endif
   
   #endif

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