sleepctl(1) [debian man page]
SLEEPCTL(1) General Commands Manual SLEEPCTL(1) NAME
sleepctl - enable/disable sleepd SYNOPSIS
sleeptcl [on|off|status] DESCRIPTION
sleepctl allows temporarily disabling of the sleepd(8) daemon, by a regular user. This can be useful when you're in the middle of a long download or compile, and don't want the system going to sleep in the middle. "sleepctl off" makes sleepd not put the system to sleep even if it thinks it is idle. If this command is run more than once, the requests stack up, and a like number of "sleepctl on" commands must be run to re-enable sleeping. This may be useful if multiple automated processes or users use the command. Note that the system may still be put to sleep for other reasons, such as a failing battery. "sleepctl on" re-enables sleeping. If sleeping is re-enabled and sleepd has seen no system activity for some time, and has been prevented from putting the system to sleep, it may put the system to sleep immediatly. "sleepctl status" outputs the current status of sleepd. Note that if the system is forced to sleep by other means, sleepd will not remember what mode it was in when it wakes back up, and will return to the default mode of putting the system to sleep after some amount of inactivity. This is by design, so you may easily and natu- rally undo the effects of a "sleepctl off" without remembering to turn it back on. This program communicates with sleepd by writing to the file /var/run/sleepd.ctl. As such, it needs read/write access to that file. It also needs to run as whatever user sleepd runs as, so it can hup the daemon. EXAMPLES
sleepctl off ; wget http://foo/huge.tgz ; sleepctl on SEE ALSO
sleepd(8) http://kitenet.net/~joey/code/sleepd/ AUTHOR
Joey Hess <joey@kitenet.net> SLEEPCTL(1)
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wakeup(9r) wakeup(9r) NAME
wakeup - General: Wakes up all processes sleeping on a specified address SYNOPSIS
void wakeup( caddr_t channel ); ARGUMENTS
Specifies the address on which the wakeup is to be issued. DESCRIPTION
The wakeup routine wakes up all processes sleeping on the address specified by the channel argument. All processes sleeping on this address are awakened and made ready to be scheduled according to the priorities they specified when they went to sleep. It is possible that there are no processes sleeping on the channel at the time the wakeup is issued. This situation can occur for a variety of reasons and does not represent an error condition. The sleep and wakeup routines block and unblock a process. Generally, a device driver issues these routines on behalf of a process request- ing I/O while a transfer is in progress. That is, a process requesting I/O is put to sleep on an address associated with the request by the appropriate device driver routine. When the transfer has asynchronously completed, the device driver interrupt service routine issues a wakeup on the address associated with the completed request. This action makes the relevant process to be scheduled. The process resumes execution within the relevant device driver routine at the point immediately following the request to sleep. The driver, on behalf of the process, can then determine whether the condition for which it was sleeping (in this example, completion of an I/O request) has been removed. If so, it can continue on to complete the I/O request. Otherwise, the appropriate driver routine can decide to put the process back to sleep to await removal of the indicated condition. RETURN VALUES
None SEE ALSO
Routines: mpsleep(9r), sleep(9r) wakeup(9r)