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Full Discussion: How can a file be locked for a certain time?
Top Forums UNIX for Dummies Questions & Answers How can a file be locked for a certain time? Post 44581 by natter on Monday 8th of December 2003 03:55:39 PM
Old 12-08-2003
Same problem, kinda
I have this same problem except when I create the semaphore file using a shell script, what happens if the shell script fails and the semaphore file is sitting out there forever?

So, the next time the script runs, it sees the semaphore file and doesn't run.

I need something like a 'finally' block in Java where if the shell script bails out, it needs to remove the semaphore file.

Any idea how to do this using shell scripting?
 

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LEARN ABOUT SUNOS

semaphore

semaphore.h(3HEAD)						      Headers							semaphore.h(3HEAD)

NAME

       semaphore.h, semaphore - semaphores

SYNOPSIS

       #include <semaphore.h>

DESCRIPTION

       The  <semaphore.h>  header  defines  the sem_t type, used in performing semaphore operations. The semaphore can be implemented using a file
       descriptor, in which case applications are able to open up at least a total of {OPEN_MAX} files and semaphores. The  symbol  SEM_FAILED	is
       defined (see sem_open(3RT)).

       Inclusion  of  the <semaphore.h> header can make visible symbols defined in the headers <fcntl.h> and <sys/types.h>. See fcntl.h(3HEAD) and
       types.h(3HEAD).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fcntl.h(3HEAD), types.h(3HEAD),	sem_destroy(3RT),  sem_getvalue(3RT),  sem_init(3RT),  sem_open(3RT),  sem_post(3RT),  sem_timedwait(3RT),
       sem_unlink(3RT), sem_wait(3RT), attributes(5), standards(5)

SunOS 5.10							    10 Sep 2004 						semaphore.h(3HEAD)
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