NAME | SYNOPSIS | API RESTRICTIONS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO
cc [ flag... ] file... -lrt [ library... ] $(OS_DIR)/lib/libc.a #include <semaphore.h>int sem_unlink(const char *name);
The function or functions documented here may not be used safely in all application contexts with all APIs provided in the ChorusOS 5.0 product.
See API(5FEA) for details.
The sem_unlink() function removes the semaphore named by the string name. If the semaphore named by name is currently referenced by other processes, 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(3POSIX), _exit(2K), or one of the exec functions (see exec(3POSIX)). Calls to sem_open(3POSIX) 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.
On 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.
The sem_unlink() function will fail if:
Permission is denied to unlink the named semaphore.
The length of the name string exceeds PATH_MAX, or a pathname component is longer than NAME_MAX while _POSIX_NO_TRUNC is in effect.
The named semaphore does not exist.
The sem_unlink() function is not supported by the system.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
MT-Level | MT-Safe |
NAME | SYNOPSIS | API RESTRICTIONS | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO