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Full Discussion: Semaphore Segmentation Fault
Top Forums Programming Semaphore Segmentation Fault Post 302091072 by tejbuch on Thursday 28th of September 2006 10:29:54 PM
Old 09-28-2006
sem_open() should ideally return the address of the semaphore whereas in this case it is returning 0 ..What can be the probable reasons for the open() call not working?
 

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SEM_UNLINK(2)						      BSD System Calls Manual						     SEM_UNLINK(2)

NAME
sem_unlink -- remove a named semaphore SYNOPSIS
#include <semaphore.h> int sem_unlink(const char *name); DESCRIPTION
The named semaphore named name is removed. If the semaphore is in use by other processes, then name is immediately disassociated with the semaphore, but the semaphore itself will not be removed until all references to it have been closed. Subsequent calls to sem_open() using name will refer to or create a new semaphore named name. If successful, sem_unlink() will return 0. Otherwise, -1 is returned and errno is set, and the state of the semaphore is unchanged. ERRORS
sem_unlink() succeeds unless: [EACCES] Permission is denied to be remove the semaphore. [ENAMETOOLONG] name exceeded PSEMNAMLEN characters. [ENOENT] The named semaphore does not exist. SEE ALSO
sem_close(2), sem_open(2), semctl(2), semget(2), semop(2) HISTORY
sem_unlink() is specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995). Darwin June 8, 2000 Darwin
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