SEM_CLOSE

Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
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NAME

sem_close - close a named semaphore  

SYNOPSIS

#include <semaphore.h>

int sem_close(sem_t *sem);

Link with -pthread.  

DESCRIPTION

sem_close() closes the named semaphore referred to by sem, allowing any resources that the system has allocated to the calling process for this semaphore to be freed.  

RETURN VALUE

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

ERRORS

EINVAL

sem is not a valid semaphore.

 

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
sem_close()	Thread safety	MT-Safe

 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.  

NOTES

All open named semaphores are automatically closed on process termination, or upon execve(2).  

SEE ALSO

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

COLOPHON

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

ATTRIBUTES

CONFORMING TO

NOTES

SEE ALSO

COLOPHON