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