Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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. */
32extern 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
39static inline int request_module(const char *name, ...) { return -ENOSYS; }
40static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; }
41#define try_then_request_module(x, mod...) (x)
42#endif
43
44
45struct key;
46struct file;
47struct subprocess_info;
48
49/* Allocate a subprocess_info structure */
50struct 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 */
54void call_usermodehelper_setkeys(struct subprocess_info *info,
55 struct key *session_keyring);
56int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
57 struct file **filp);
58void call_usermodehelper_setcleanup(struct subprocess_info *info,
59 void (*cleanup)(char **argv, char **envp));
60
61enum 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 */
68int 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 */
72void call_usermodehelper_freeinfo(struct subprocess_info *info);
73
74static inline int
75call_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
86static inline int
87call_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
101extern void usermodehelper_init(void);
102
103struct file;
104extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
105 struct file **filp);
106
107extern int usermodehelper_disable(void);
108extern void usermodehelper_enable(void);
109
110#endif /* __LINUX_KMOD_H__ */