1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/****************************************************************************
* binfmt/binfmt_exec.c
*
* Copyright (C) 2009, 2013-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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. Neither the name NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <string.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
#include <nuttx/binfmt/binfmt.h>
#include "binfmt_internal.h"
#ifndef CONFIG_BINFMT_DISABLE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: exec
*
* Description:
* This is a convenience function that wraps load_ and exec_module into
* one call. If CONFIG_SCHED_ONEXIT and CONFIG_SCHED_HAVE_PARENT are
* also defined, this function will automatically call schedule_unload()
* to unload the module when task exits.
*
* NOTE: This function is flawed and useless without CONFIG_SCHED_ONEXIT
* and CONFIG_SCHED_HAVE_PARENT because there is then no mechanism to
* unload the module once it exits.
*
* Input Parameter:
* filename - Full path to the binary to be loaded
* argv - Argument list
* exports - Table of exported symbols
* nexports - The number of symbols in exports
*
* Returned Value:
* This is an end-user function, so it follows the normal convention:
* It returns the PID of the exec'ed module. On failure, it returns
* -1 (ERROR) and sets errno appropriately.
*
****************************************************************************/
int exec(FAR const char *filename, FAR char * const *argv,
FAR const struct symtab_s *exports, int nexports)
{
#if defined(CONFIG_SCHED_ONEXIT) && defined(CONFIG_SCHED_HAVE_PARENT)
FAR struct binary_s *bin;
int pid;
int ret;
/* Allocate the load information */
bin = (FAR struct binary_s *)kmm_zalloc(sizeof(struct binary_s));
if (!bin)
{
set_errno(ENOMEM);
return ERROR;
}
/* Load the module into memory */
bin->filename = filename;
bin->argv = argv;
bin->exports = exports;
bin->nexports = nexports;
ret = load_module(bin);
if (ret < 0)
{
bdbg("ERROR: Failed to load program '%s'\n", filename);
kmm_free(bin);
return ERROR;
}
/* Disable pre-emption so that the executed module does
* not return until we get a chance to connect the on_exit
* handler.
*/
sched_lock();
/* Then start the module */
pid = exec_module(bin);
if (pid < 0)
{
bdbg("ERROR: Failed to execute program '%s'\n", filename);
sched_unlock();
unload_module(bin);
kmm_free(bin);
return ERROR;
}
/* Set up to unload the module (and free the binary_s structure)
* when the task exists.
*/
ret = schedule_unload(pid, bin);
if (ret < 0)
{
bdbg("ERROR: Failed to schedul unload '%s'\n", filename);
}
sched_unlock();
return pid;
#else
struct binary_s bin;
int ret;
/* Load the module into memory */
memset(&bin, 0, sizeof(struct binary_s));
bin.filename = filename;
bin.exports = exports;
bin.nexports = nexports;
ret = load_module(&bin);
if (ret < 0)
{
bdbg("ERROR: Failed to load program '%s'\n", filename);
return ERROR;
}
/* Then start the module */
ret = exec_module(&bin);
if (ret < 0)
{
bdbg("ERROR: Failed to execute program '%s'\n", filename);
unload_module(&bin);
return ERROR;
}
/* TODO: How does the module get unloaded in this case? */
return ret;
#endif
}
#endif /* !CONFIG_BINFMT_DISABLE */
|
