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Full Discussion: semaphore removal
Top Forums UNIX for Dummies Questions & Answers semaphore removal Post 302471245 by joker40 on Friday 12th of November 2010 10:19:52 AM
Old 11-12-2010
semaphore removal
I have one process which creates semaphore with permission 600. Then at some part of the code I have line where this semaphore will be removed. Problem I have is that other processes in my program also try to execute this line of code. Of course since they dont have permission they wont be able to remove it but I would like only creator of this semaphore to be able to execute this line. Is there way to check if process have permission and if so remove semaphore if not just to move on and not execute this line.
 

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LEARN ABOUT CENTOS

sem_unlink

SEM_UNLINK(3)						     Linux Programmer's Manual						     SEM_UNLINK(3)

NAME

       sem_unlink - remove a named semaphore

SYNOPSIS

       #include <semaphore.h>

       int sem_unlink(const char *name);

       Link with -pthread.

DESCRIPTION

       sem_unlink()  removes the named semaphore referred to by name.  The semaphore name is removed immediately.  The semaphore is destroyed once
       all other processes that have the semaphore open close it.

RETURN VALUE

       On success sem_unlink() returns 0; on error, -1 is returned, with errno set to indicate the error.

ERRORS

       EACCES The caller does not have permission to unlink this semaphore.

       ENAMETOOLONG
	      name was too long.

       ENOENT There is no semaphore with the given name.

CONFORMING TO

       POSIX.1-2001.

SEE ALSO

       sem_getvalue(3), sem_open(3), sem_post(3), sem_wait(3), sem_overview(7)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2012-05-13							     SEM_UNLINK(3)
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