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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(1) User Commands sleep(1) NAME
sleep - suspend execution for an interval SYNOPSIS
/usr/bin/sleep /usr/bin/sleep time ksh93 sleep time DESCRIPTION
/usr/bin/sleep sleep suspends execution for at least the integral number of seconds specified by time. ksh93 sleep suspends execution for at least the time in seconds specified by time or until a SIGALRM signal is received. OPERANDS
/usr/bin/sleep The following operands are supported for /usr/bin/sleep: time time in seconds can be specified as a non-negative decimal integer number. ksh93 The following operands are supported: time Specify time in seconds as a floating point number. The actual granularity depends on the underlying system, normally around 1 mil- lisecond. EXAMPLES
Example 1 Suspending Command Execution The following example executes a command after a certain amount of time: example% (sleep 105; command)& Example 2 Executing a Command Every So Often The following example executes a command every so often: example% while true do command sleep 37 done ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received (see NOTES). >0 An error has occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin/sleep +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+ ksh93 +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Uncommitted | +-----------------------------+-----------------------------+ SEE ALSO
ksh93(1), wait(1), alarm(2), sleep(3C), wait(3UCB), attributes(5), environ(5), standards(5) NOTES
If the sleep utility receives a SIGALRM signal, one of the following actions is taken: o Terminate normally with a zero exit status. o Effectively ignore the signal. The sleep utility takes the standard action for all other signals. SunOS 5.11 20 Nov 2007 sleep(1)