sem_close - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMEsem_close − close a named semaphore

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LIBRARYPOSIX threads library (libpthread, −lpthread)

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SYNOPSIS#include <semaphore.h>int sem_close(sem_t *sem);

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DESCRIPTIONsem_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.

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

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ERRORSEINVAL  sem is not a valid semaphore.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue sem_close() Thread safetyMT-Safe

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STANDARDSPOSIX.1-2001, POSIX.1-2008.

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

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SEE ALSOsem_getvalue(3), sem_open(3), sem_post(3), sem_unlink(3), sem_wait(3), sem_overview(7) 0

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