__usermodehelper

Name:__usermodehelper_disable - Prevent new helpers from being started.*@depth: New value to assign to usermodehelper_disabled.* Set usermodehelper_disabled to @depth and wait for running helpers to exit.

Proto:int __usermodehelper_disable(enum umh_disable_depth depth)

Type:int

Parameter:

Type	Parameter	Name
enum umh_disable_depth	depth

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If Not depth Then Return -EINVAL

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lock for writing

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If set, call_usermodehelper_exec() will exit immediately returning -EBUSY* (used for preventing user land processes from being created after the user* land has been frozen during a system-wide hibernation or suspend operation). = depth

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lease a write lock

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retval = wait_event_timeout - sleep until a condition gets true or a timeout elapses*@wq_head: the waitqueue to wait on*@condition: a C expression for the event to wait for*@timeout: timeout, in jiffies* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the(Wait queue head used by usermodehelper_disable() to wait for all running* helpers to finish., atomic_read( & Number of helpers running ) == 0, Time to wait for running_helpers to become zero before the setting of* usermodehelper_disabled in usermodehelper_disable() fails)

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If retval Then Return 0

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__usermodehelper_set_disable_depth - Modify usermodehelper_disabled.*@depth: New value to assign to usermodehelper_disabled.* Change the value of usermodehelper_disabled (under umhelper_sem locked for* writing) and wakeup tasks waiting for it to change.

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Return -EAGAIN

**Caller**
Name	Describe
freeze_processes	ze_processes - Signal user space processes to enter the refrigerator.* The current thread will not be frozen. The same process that calls* freeze_processes must later call thaw_processes.* On success, returns 0
usermodehelper_disable

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