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/gfp.h>
23 #include <linux/stddef.h>
24 #include <linux/errno.h>
25 #include <linux/compiler.h>
26
27 #define KMOD_PATH_LEN 256
28
29 #ifdef CONFIG_MODULES
30 /* modprobe exit status on success, -ve on error. Return value
31 * usually useless though. */
32 extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
33 #define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))
34 #else
request_module(const char * name,...)35 static inline int request_module(const char * name, ...) { return -ENOSYS; }
36 #define try_then_request_module(x, mod...) (x)
37 #endif
38
39
40 struct key;
41 struct file;
42 struct subprocess_info;
43
44 /* Allocate a subprocess_info structure */
45 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
46 char **envp, gfp_t gfp_mask);
47
48 /* Set various pieces of state into the subprocess_info structure */
49 void call_usermodehelper_setkeys(struct subprocess_info *info,
50 struct key *session_keyring);
51 int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
52 struct file **filp);
53 void call_usermodehelper_setcleanup(struct subprocess_info *info,
54 void (*cleanup)(char **argv, char **envp));
55
56 enum umh_wait {
57 UMH_NO_WAIT = -1, /* don't wait at all */
58 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
59 UMH_WAIT_PROC = 1, /* wait for the process to complete */
60 };
61
62 /* Actually execute the sub-process */
63 int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
64
65 /* Free the subprocess_info. This is only needed if you're not going
66 to call call_usermodehelper_exec */
67 void call_usermodehelper_freeinfo(struct subprocess_info *info);
68
69 static inline int
call_usermodehelper(char * path,char ** argv,char ** envp,enum umh_wait wait)70 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
71 {
72 struct subprocess_info *info;
73 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
74
75 info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
76 if (info == NULL)
77 return -ENOMEM;
78 return call_usermodehelper_exec(info, wait);
79 }
80
81 static inline int
call_usermodehelper_keys(char * path,char ** argv,char ** envp,struct key * session_keyring,enum umh_wait wait)82 call_usermodehelper_keys(char *path, char **argv, char **envp,
83 struct key *session_keyring, enum umh_wait wait)
84 {
85 struct subprocess_info *info;
86 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
87
88 info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
89 if (info == NULL)
90 return -ENOMEM;
91
92 call_usermodehelper_setkeys(info, session_keyring);
93 return call_usermodehelper_exec(info, wait);
94 }
95
96 extern void usermodehelper_init(void);
97
98 struct file;
99 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
100 struct file **filp);
101
102 extern int usermodehelper_disable(void);
103 extern void usermodehelper_enable(void);
104
105 #endif /* __LINUX_KMOD_H__ */
106