FreeBSD/Linux Kernel Cross Reference
sys/sys/exec.h
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: releng/10.2/sys/sys/exec.h 270670 2014-08-26 19:58:48Z wblock $
36 */
37
38 #ifndef _SYS_EXEC_H_
39 #define _SYS_EXEC_H_
40
41 /*
42 * Before ps_args existed, the following structure, found at the top of
43 * the user stack of each user process, was used by ps(1) to locate
44 * environment and argv strings. Normally ps_argvstr points to the
45 * argv vector, and ps_nargvstr is the same as the program's argc. The
46 * fields ps_envstr and ps_nenvstr are the equivalent for the environment.
47 *
48 * Programs should now use setproctitle(3) to change ps output.
49 * setproctitle() always informs the kernel with sysctl and sets the
50 * pointers in ps_strings. The kern.proc.args sysctl first tries p_args.
51 * If p_args is NULL, it then falls back to reading ps_strings and following
52 * the pointers.
53 */
54 struct ps_strings {
55 char **ps_argvstr; /* first of 0 or more argument strings */
56 unsigned int ps_nargvstr; /* the number of argument strings */
57 char **ps_envstr; /* first of 0 or more environment strings */
58 unsigned int ps_nenvstr; /* the number of environment strings */
59 };
60
61 /*
62 * Address of ps_strings structure (in user space).
63 * Prefer the kern.ps_strings or kern.proc.ps_strings sysctls to this constant.
64 */
65 #define PS_STRINGS (USRSTACK - sizeof(struct ps_strings))
66 #define SPARE_USRSPACE 4096
67
68 struct image_params;
69
70 struct execsw {
71 int (*ex_imgact)(struct image_params *);
72 const char *ex_name;
73 };
74
75 #include <machine/exec.h>
76
77 #ifdef _KERNEL
78 #include <sys/cdefs.h>
79
80 int exec_map_first_page(struct image_params *);
81 void exec_unmap_first_page(struct image_params *);
82
83 int exec_register(const struct execsw *);
84 int exec_unregister(const struct execsw *);
85
86 /*
87 * note: name##_mod cannot be const storage because the
88 * linker_file_sysinit() function modifies _file in the
89 * moduledata_t.
90 */
91
92 #include <sys/module.h>
93
94 #define EXEC_SET(name, execsw_arg) \
95 static int __CONCAT(name,_modevent)(module_t mod, int type, \
96 void *data) \
97 { \
98 struct execsw *exec = (struct execsw *)data; \
99 int error = 0; \
100 switch (type) { \
101 case MOD_LOAD: \
102 /* printf(#name " module loaded\n"); */ \
103 error = exec_register(exec); \
104 if (error) \
105 printf(__XSTRING(name) "register failed\n"); \
106 break; \
107 case MOD_UNLOAD: \
108 /* printf(#name " module unloaded\n"); */ \
109 error = exec_unregister(exec); \
110 if (error) \
111 printf(__XSTRING(name) " unregister failed\n");\
112 break; \
113 default: \
114 error = EOPNOTSUPP; \
115 break; \
116 } \
117 return error; \
118 } \
119 static moduledata_t __CONCAT(name,_mod) = { \
120 __XSTRING(name), \
121 __CONCAT(name,_modevent), \
122 (void *)& execsw_arg \
123 }; \
124 DECLARE_MODULE_TIED(name, __CONCAT(name,_mod), SI_SUB_EXEC, \
125 SI_ORDER_ANY)
126 #endif
127
128 #endif
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