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Shell Programming and Scripting
Wrapping 'sleep' with my 'resleep' function (Resettable sleep)
Post 302357043 by deckard on Monday 28th of September 2009 01:58:20 PM
09-28-2009
cfajohnson:
Thanks very much for the feedback. UUoC! I didn't know what that was until a little Google help... I'll demoggify the original script in a few minutes.
The reason I didn't use a variable is that the problem I'm trying to solve is when sleep is used by a process that doesn't have a terminal (scheduled from crontab or backgrounded and the parent shell terminated). Unless there's a way to set up variables that can be accessed from any shell on the system... Sometimes when I schedule a job with cron with the execution length controlled by sleep, I want to be able to reset the execution length. I'm sure there is a much cleaner way to do this than a temp file though.
---------- Post updated at 01:58 PM ---------- Previous update was at 01:41 PM ----------
Corona688:
Man that's pretty cool! (I only looked at the code, haven't tried it yet) You're right that it would probably be done better in C, but I'm still working on learning C. But thank you very much for taking the time to actually code something in C as an example for a better approach. That's what makes the people of unix.com so great!
Thanks very much for the feedback. UUoC! I didn't know what that was until a little Google help... I'll demoggify the original script in a few minutes.
The reason I didn't use a variable is that the problem I'm trying to solve is when sleep is used by a process that doesn't have a terminal (scheduled from crontab or backgrounded and the parent shell terminated). Unless there's a way to set up variables that can be accessed from any shell on the system... Sometimes when I schedule a job with cron with the execution length controlled by sleep, I want to be able to reset the execution length. I'm sure there is a much cleaner way to do this than a temp file though.
---------- Post updated at 01:58 PM ---------- Previous update was at 01:41 PM ----------
Corona688:
Man that's pretty cool! (I only looked at the code, haven't tried it yet) You're right that it would probably be done better in C, but I'm still working on learning C. But thank you very much for taking the time to actually code something in C as an example for a better approach. That's what makes the people of unix.com so great!
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LEARN ABOUT OPENSOLARIS
sleep
sleep(3UCB) SunOS/BSD Compatibility Library Functions sleep(3UCB) NAME
sleep - suspend execution for interval SYNOPSIS
/usr/ucb/cc [ flag ... ] file ... int sleep(seconds) unsigned seconds; DESCRIPTION
sleep() suspends the current process from execution for the number of seconds specified by the argument. The actual suspension time may be up to 1 second less than that requested, because scheduled wakeups occur at fixed 1-second intervals, and may be an arbitrary amount longer because of other activity in the system. sleep() is implemented by setting an interval timer and pausing until it expires. The previous state of this timer is saved and restored. If the sleep time exceeds the time to the expiration of the previous value of the timer, the process sleeps only until the timer would have expired, and the signal which occurs with the expiration of the timer is sent one second later. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
cc(1B), alarm(2), getitimer(2), longjmp(3C), siglongjmp(3C), sleep(3C), usleep(3C), attributes(5) NOTES
Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system libraries or in multi-thread applications is unsupported. SIGALRM should not be blocked or ignored during a call to sleep(). Only a prior call to alarm(2) should generate SIGALRM for the calling process during a call to sleep(). A signal-catching function should not interrupt a call to sleep() to call siglongjmp(3C) or longjmp(3C) to restore an environment saved prior to the sleep() call. WARNINGS
sleep() is slightly incompatible with alarm(2). Programs that do not execute for at least one second of clock time between successive calls to sleep() indefinitely delay the alarm signal. Use sleep(3C). Each sleep(3C) call postpones the alarm signal that would have been sent during the requested sleep period to occur one second later. SunOS 5.11 30 Oct 2007 sleep(3UCB)