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#include <linux/workqueue.h>
27#include <linux/sysctl.h>
28
29#define KMOD_PATH_LEN 256
30
31#ifdef CONFIG_MODULES
32extern char modprobe_path[]; /* for sysctl */
33/* modprobe exit status on success, -ve on error. Return value
34 * usually useless though. */
35extern __printf(2, 3)
36int __request_module(bool wait, const char *name, ...);
37#define request_module(mod...) __request_module(true, mod)
38#define request_module_nowait(mod...) __request_module(false, mod)
39#define try_then_request_module(x, mod...) \
40 ((x) ?: (__request_module(true, mod), (x)))
41#else
42static inline int request_module(const char *name, ...) { return -ENOSYS; }
43static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; }
44#define try_then_request_module(x, mod...) (x)
45#endif
46
47
48struct cred;
49struct file;
50
51enum umh_wait {
52 UMH_NO_WAIT = -1, /* don't wait at all */
53 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
54 UMH_WAIT_PROC = 1, /* wait for the process to complete */
55};
56
57struct subprocess_info {
58 struct work_struct work;
59 struct completion *complete;
60 char *path;
61 char **argv;
62 char **envp;
63 enum umh_wait wait;
64 int retval;
65 int (*init)(struct subprocess_info *info, struct cred *new);
66 void (*cleanup)(struct subprocess_info *info);
67 void *data;
68};
69
70/* Allocate a subprocess_info structure */
71struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
72 char **envp, gfp_t gfp_mask);
73
74/* Set various pieces of state into the subprocess_info structure */
75void call_usermodehelper_setfns(struct subprocess_info *info,
76 int (*init)(struct subprocess_info *info, struct cred *new),
77 void (*cleanup)(struct subprocess_info *info),
78 void *data);
79
80/* Actually execute the sub-process */
81int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
82
83/* Free the subprocess_info. This is only needed if you're not going
84 to call call_usermodehelper_exec */
85void call_usermodehelper_freeinfo(struct subprocess_info *info);
86
87static inline int
88call_usermodehelper_fns(char *path, char **argv, char **envp,
89 enum umh_wait wait,
90 int (*init)(struct subprocess_info *info, struct cred *new),
91 void (*cleanup)(struct subprocess_info *), void *data)
92{
93 struct subprocess_info *info;
94 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
95
96 info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
97
98 if (info == NULL)
99 return -ENOMEM;
100
101 call_usermodehelper_setfns(info, init, cleanup, data);
102
103 return call_usermodehelper_exec(info, wait);
104}
105
106static inline int
107call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
108{
109 return call_usermodehelper_fns(path, argv, envp, wait,
110 NULL, NULL, NULL);
111}
112
113extern struct ctl_table usermodehelper_table[];
114
115extern void usermodehelper_init(void);
116
117extern int usermodehelper_disable(void);
118extern void usermodehelper_enable(void);
119extern bool usermodehelper_is_disabled(void);
120
121#endif /* __LINUX_KMOD_H__ */