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semctl ID,SEMNUM,CMD,ARG

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semctl ID,SEMNUM,CMD,ARG

Calls the System V IPC function semctl. If CMD is &IPC_STAT or &GETALL, then ARG must be a variable which will hold the returned semid_ds structure or semaphore value array. Returns like ioctl: the undefined value for error, ``0 but true'' for zero, or the actual return value otherwise.

Source: Perl builtin functions
Copyright: Larry Wall, et al.

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