1 #ifndef __LINUX_KMOD_H__
2 #define __LINUX_KMOD_H__
3
4 /*
5 * include/linux/kmod.h
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/stddef.h>
23 #include <linux/errno.h>
24 #include <linux/compiler.h>
25
26 #define KMOD_PATH_LEN 256
27
28 #ifdef CONFIG_KMOD
29 /* modprobe exit status on success, -ve on error. Return value
30 * usually useless though. */
31 extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
32 #else
33 static inline int request_module(const char * name, ...) { return -ENOSYS; }
34 #endif
35
36 #define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))
37
38 struct key;
39 struct file;
40 struct subprocess_info;
41
42 /* Allocate a subprocess_info structure */
43 struct subprocess_info *call_usermodehelper_setup(char *path,
44 char **argv, char **envp);
45
46 /* Set various pieces of state into the subprocess_info structure */
47 void call_usermodehelper_setkeys(struct subprocess_info *info,
48 struct key *session_keyring);
49 int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
50 struct file **filp);
51 void call_usermodehelper_setcleanup(struct subprocess_info *info,
52 void (*cleanup)(char **argv, char **envp));
53
54 enum umh_wait {
55 UMH_NO_WAIT = -1, /* don't wait at all */
56 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
57 UMH_WAIT_PROC = 1, /* wait for the process to complete */
58 };
59
60 /* Actually execute the sub-process */
61 int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
62
63 /* Free the subprocess_info. This is only needed if you're not going
64 to call call_usermodehelper_exec */
65 void call_usermodehelper_freeinfo(struct subprocess_info *info);
66
67 static inline int
68 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
69 {
70 struct subprocess_info *info;
71
72 info = call_usermodehelper_setup(path, argv, envp);
73 if (info == NULL)
74 return -ENOMEM;
75 return call_usermodehelper_exec(info, wait);
76 }
77
78 static inline int
79 call_usermodehelper_keys(char *path, char **argv, char **envp,
80 struct key *session_keyring, enum umh_wait wait)
81 {
82 struct subprocess_info *info;
83
84 info = call_usermodehelper_setup(path, argv, envp);
85 if (info == NULL)
86 return -ENOMEM;
87
88 call_usermodehelper_setkeys(info, session_keyring);
89 return call_usermodehelper_exec(info, wait);
90 }
91
92 extern void usermodehelper_init(void);
93
94 struct file;
95 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
96 struct file **filp);
97
98 #endif /* __LINUX_KMOD_H__ */
99
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