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OpenSolaris 2009.06 - man page for sem_unlink (opensolaris section 3c)

sem_unlink(3C)						   Standard C Library Functions 					    sem_unlink(3C)

NAME
sem_unlink - remove a named semaphore
SYNOPSIS
#include <semaphore.h> int sem_unlink(const char *name);
DESCRIPTION
The sem_unlink() function removes the semaphore named by the string name. If the semaphore named by name is currently referenced by other processes, then sem_unlink() has 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(3C), _Exit(2), or one of the exec functions (see exec(2)) . Calls to sem_open(3C) to re-create or re-connect to the semaphore refer to a new semaphore after sem_unlink() is called. The sem_unlink() call does not block until all references have been destroyed; it returns immediately.
RETURN VALUES
Upon successful completion, sem_unlink() returns 0. Otherwise, the semaphore is not changed and the function returns a value of -1 and sets errno to indicate the error.
ERRORS
The sem_unlink() function will fail if: EACCES Permission is denied to unlink the named semaphore. ENAMETOOLONG The length of name string exceeds PATH_MAX, or a pathname component is longer than NAME_MAX while _POSIX_NO_TRUNC is in effect. ENOENT The named semaphore does not exist. ENOSYS The sem_unlink() function is not supported by the system.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ |ATTRIBUTE TYPE |ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+
SEE ALSO
exec(2), exit(2), sem_close(3C), sem_open(3C), attributes(5), standards(5)
NOTES
Solaris 2.6 was the first release to support the Asynchronous Input and Output option. Prior to this release, this function always returned -1 and set errno to ENOSYS. SunOS 5.11 5 Feb 2008 sem_unlink(3C)

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