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sem_close(3)

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



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).

       allbox;  lb  lb  lb  l  l  l.  Interface Attribute Value T{ sem_close()
       T}   Thread safety  MT-Safe


CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       All open named semaphores are automatically closed on process  termina‐
       tion, 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
       This page is part of release 5.02 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.



Linux                             2017-09-15                      SEM_CLOSE(3)
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