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usermodehelper: split setup from execution

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Rather than having hundreds of variations of call_usermodehelper for
various pieces of usermode state which could be set up, split the
info allocation and initialization from the actual process execution.

This means the general pattern becomes:
 info = call_usermodehelper_setup(path, argv, envp); /* basic state */
 call_usermodehelper_<SET EXTRA STATE>(info, stuff...);	/* extra state */
 call_usermodehelper_exec(info, wait);	/* run process and free info */

This patch introduces wrappers for all the existing calling styles for
call_usermodehelper_*, but folds their implementations into one.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: David Howells <dhowells@redhat.com>
Cc: Bj?rn Steinbrink <B.Steinbrink@gmx.de>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
This commit is contained in:
Jeremy Fitzhardinge 2007-07-17 18:37:02 -07:00 • committed by Jeremy Fitzhardinge
parent d84d1cc764
commit 0ab4dc9227
2 changed files with 180 additions and 63 deletions
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44
include/linux/kmod.h
View file

@ -36,13 +36,51 @@ static inline int request_module(const char * name, ...) { return -ENOSYS; }
#define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))
struct key;
extern int call_usermodehelper_keys(char *path, char *argv[], char *envp[],
struct key *session_keyring, int wait);
struct file;
struct subprocess_info;
/* Allocate a subprocess_info structure */
struct subprocess_info *call_usermodehelper_setup(char *path,
char **argv, char **envp);
/* Set various pieces of state into the subprocess_info structure */
void call_usermodehelper_setkeys(struct subprocess_info *info,
struct key *session_keyring);
int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
struct file **filp);
void call_usermodehelper_setcleanup(struct subprocess_info *info,
void (*cleanup)(char **argv, char **envp));
/* Actually execute the sub-process */
int call_usermodehelper_exec(struct subprocess_info *info, int 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(char *path, char **argv, char **envp, int wait)
{
return call_usermodehelper_keys(path, argv, envp, NULL, wait);
struct subprocess_info *info;
info = call_usermodehelper_setup(path, argv, envp);
if (info == NULL)
return -ENOMEM;
return call_usermodehelper_exec(info, wait);
}
static inline int
call_usermodehelper_keys(char *path, char **argv, char **envp,
struct key *session_keyring, int wait)
{
struct subprocess_info *info;
info = call_usermodehelper_setup(path, argv, envp);
if (info == NULL)
return -ENOMEM;
call_usermodehelper_setkeys(info, session_keyring);
return call_usermodehelper_exec(info, wait);
}
extern void usermodehelper_init(void);