February 2012
Intermediate to advanced
1184 pages
37h 17m
English
Content preview from Programming Perl, 4th Editionmsgctl
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msgctl 
msgctlID,CMD,ARG
This function calls the System V IPC
msgctl(2) syscall; see
msgctl(2) for more details. You may have to
use IPC::SysV first to get the correct constant definitions. If
CMD is IPC_STAT, then ARG
must be a variable that will hold the returned msqid_ds C structure. Return values are like
ioctl and fcntl: undef for error, “0
but true” for zero, or the actual return value
otherwise.
This function is available only on machines supporting System V IPC, which turns out to be far fewer than those supporting sockets.
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