1sem_close(3)               Library Functions Manual               sem_close(3)
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NAME

6       sem_close - close a named semaphore
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LIBRARY

9       POSIX threads library (libpthread, -lpthread)
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SYNOPSIS

12       #include <semaphore.h>
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14       int sem_close(sem_t *sem);
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DESCRIPTION

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

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

26       EINVAL sem is not a valid semaphore.
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ATTRIBUTES

29       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
30       tributes(7).
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32       ┌────────────────────────────────────────────┬───────────────┬─────────┐
33       │Interface                                   │ Attribute     │ Value   │
34       ├────────────────────────────────────────────┼───────────────┼─────────┤
35       │sem_close()                                 │ Thread safety │ MT-Safe │
36       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

39       POSIX.1-2008.
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HISTORY

42       POSIX.1-2001.
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NOTES

45       All  open named semaphores are automatically closed on process termina‐
46       tion, or upon execve(2).
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SEE ALSO

49       sem_getvalue(3), sem_open(3), sem_post(3), sem_unlink(3),  sem_wait(3),
50       sem_overview(7)
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54Linux man-pages 6.04              2023-03-30                      sem_close(3)