semctl - SysV semaphore control operations |
semctl - SysV semaphore control operations
semctl ID,SEMNUM,CMD,ARG
Calls the System V IPC function semctl
. You'll probably have to say
use IPC::SysV;
first to get the correct constant definitions. If CMD is IPC_STAT or
GETALL, then ARG must be a variable that 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. The ARG must consist of a vector of native
short integers, which may be created with pack("s!",(0)x$nsem)
.
See also SysV IPC in the perlipc manpage, IPC::SysV
, IPC::Semaphore
documentation.
semctl - SysV semaphore control operations |