#ifndef __LINUX_KMOD_H__ #define __LINUX_KMOD_H__ /* * include/linux/kmod.h * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/gfp.h> #include <linux/stddef.h> #include <linux/errno.h> #include <linux/compiler.h> #include <linux/workqueue.h> #include <linux/sysctl.h> #define KMOD_PATH_LEN 256 #ifdef CONFIG_MODULES extern char modprobe_path[]; /* for sysctl */ /* modprobe exit status on success, -ve on error. Return value * usually useless though. */ extern int __request_module(bool wait, const char *name, ...) \ __attribute__((format(printf, 2, 3))); #define request_module(mod...) __request_module(true, mod) #define request_module_nowait(mod...) __request_module(false, mod) #define try_then_request_module(x, mod...) \ ((x) ?: (__request_module(true, mod), (x))) #else static inline int request_module(const char *name, ...) { return -ENOSYS; } static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; } #define try_then_request_module(x, mod...) (x) #endif struct cred; struct file; enum umh_wait { UMH_NO_WAIT = -1, /* don't wait at all */ UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */ UMH_WAIT_PROC = 1, /* wait for the process to complete */ }; struct subprocess_info { struct work_struct work; struct completion *complete; char *path; char **argv; char **envp; enum umh_wait wait; int retval; int (*init)(struct subprocess_info *info, struct cred *new); void (*cleanup)(struct subprocess_info *info); void *data; }; /* Allocate a subprocess_info structure */ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, char **envp, gfp_t gfp_mask); /* Set various pieces of state into the subprocess_info structure */ void call_usermodehelper_setfns(struct subprocess_info *info, int (*init)(struct subprocess_info *info, struct cred *new), void (*cleanup)(struct subprocess_info *info), void *data); /* Actually execute the sub-process */ int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait); /* Free the subprocess_info. This is only needed if you're not going to call call_usermodehelper_exec */ void call_usermodehelper_freeinfo(struct subprocess_info *info); static inline int call_usermodehelper_fns(char *path, char **argv, char **envp, enum umh_wait wait, int (*init)(struct subprocess_info *info, struct cred *new), void (*cleanup)(struct subprocess_info *), void *data) { struct subprocess_info *info; gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; info = call_usermodehelper_setup(path, argv, envp, gfp_mask); if (info == NULL) return -ENOMEM; call_usermodehelper_setfns(info, init, cleanup, data); return call_usermodehelper_exec(info, wait); } static inline int call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait) { return call_usermodehelper_fns(path, argv, envp, wait, NULL, NULL, NULL); } extern struct ctl_table usermodehelper_table[]; extern void usermodehelper_init(void); extern int usermodehelper_disable(void); extern void usermodehelper_enable(void); extern bool usermodehelper_is_disabled(void); #endif /* __LINUX_KMOD_H__ */