Originální popis anglicky:
sem_unlink - remove a named semaphore (
REALTIME)
Návod, kniha: POSIX Programmer's Manual
#include <semaphore.h>
int sem_unlink(const char *
name);
The
sem_unlink() function shall remove the semaphore named by the string
name. If the semaphore named by
name is currently referenced by
other processes, then
sem_unlink() shall have no effect on the state of
the semaphore. If one or more processes have the semaphore open when
sem_unlink() is called, destruction of the semaphore is postponed until
all references to the semaphore have been destroyed by calls to
sem_close(),
_exit(), or
exec. Calls to
sem_open()
to recreate or reconnect to the semaphore refer to a new semaphore after
sem_unlink() is called. The
sem_unlink() call shall not block
until all references have been destroyed; it shall return immediately.
Upon successful completion, the
sem_unlink() function shall return a
value of 0. Otherwise, the semaphore shall not be changed and the function
shall return a value of -1 and set
errno to indicate the error.
The
sem_unlink() function shall fail if:
- EACCES
- Permission is denied to unlink the named semaphore.
- ENAMETOOLONG
- The length of the name argument exceeds {PATH_MAX}
or a pathname component is longer than {NAME_MAX}.
- ENOENT
- The named semaphore does not exist.
The following sections are informative.
None.
The
sem_unlink() function is part of the Semaphores option and need not
be available on all implementations.
None.
None.
semctl() ,
semget() ,
semop() ,
sem_close() ,
sem_open() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<semaphore.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
