sem_close(3)

1SEM_CLOSE(3)               Linux Programmer's Manual              SEM_CLOSE(3)
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NAME

6       sem_close - close a named semaphore
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SYNOPSIS

9       #include <semaphore.h>
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11       int sem_close(sem_t *sem);
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13       Link with -pthread.
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DESCRIPTION

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

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

25       EINVAL sem is not a valid semaphore.
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ATTRIBUTES

28       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
29       tributes(7).
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31       ┌────────────────────────────────────────────┬───────────────┬─────────┐
32       │Interface                                   │ Attribute     │ Value   │
33       ├────────────────────────────────────────────┼───────────────┼─────────┤
34       │sem_close()                                 │ Thread safety │ MT-Safe │
35       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

38       POSIX.1-2001, POSIX.1-2008.
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NOTES

41       All  open named semaphores are automatically closed on process termina‐
42       tion, or upon execve(2).
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COLOPHON

49       This  page  is  part of release 5.12 of the Linux man-pages project.  A
50       description of the project, information about reporting bugs,  and  the
51       latest     version     of     this    page,    can    be    found    at
52       https://www.kernel.org/doc/man-pages/.
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56Linux                             2021-03-22                      SEM_CLOSE(3)