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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(bool wait, const char *name, ...) \
33 : __attribute__((format(printf, 2, 3)));
34 : #define request_module(mod...) __request_module(true, mod)
35 : #define request_module_nowait(mod...) __request_module(false, mod)
36 : #define try_then_request_module(x, mod...) \
37 : ((x) ?: (__request_module(true, mod), (x)))
38 : #else
39 6 : static inline int request_module(const char *name, ...) { return -ENOSYS; }
40 : static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; }
41 : #define try_then_request_module(x, mod...) (x)
42 : #endif
43 :
44 :
45 : struct key;
46 : struct file;
47 : struct subprocess_info;
48 :
49 : /* Allocate a subprocess_info structure */
50 : struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
51 : char **envp, gfp_t gfp_mask);
52 :
53 : /* Set various pieces of state into the subprocess_info structure */
54 : void call_usermodehelper_setkeys(struct subprocess_info *info,
55 : struct key *session_keyring);
56 : int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
57 : struct file **filp);
58 : void call_usermodehelper_setcleanup(struct subprocess_info *info,
59 : void (*cleanup)(char **argv, char **envp));
60 :
61 : enum umh_wait {
62 : UMH_NO_WAIT = -1, /* don't wait at all */
63 : UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
64 : UMH_WAIT_PROC = 1, /* wait for the process to complete */
65 : };
66 :
67 : /* Actually execute the sub-process */
68 : int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
69 :
70 : /* Free the subprocess_info. This is only needed if you're not going
71 : to call call_usermodehelper_exec */
72 : void call_usermodehelper_freeinfo(struct subprocess_info *info);
73 :
74 : static inline int
75 : call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
76 : {
77 : struct subprocess_info *info;
78 : gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
79 :
80 : info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
81 : if (info == NULL)
82 : return -ENOMEM;
83 : return call_usermodehelper_exec(info, wait);
84 : }
85 :
86 : static inline int
87 : call_usermodehelper_keys(char *path, char **argv, char **envp,
88 : struct key *session_keyring, enum umh_wait wait)
89 : {
90 : struct subprocess_info *info;
91 : gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
92 :
93 : info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
94 : if (info == NULL)
95 : return -ENOMEM;
96 :
97 : call_usermodehelper_setkeys(info, session_keyring);
98 : return call_usermodehelper_exec(info, wait);
99 : }
100 :
101 : extern void usermodehelper_init(void);
102 :
103 : struct file;
104 : extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
105 : struct file **filp);
106 :
107 : extern int usermodehelper_disable(void);
108 : extern void usermodehelper_enable(void);
109 :
110 : #endif /* __LINUX_KMOD_H__ */
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