February 2012
Intermediate to advanced
1184 pages
37h 17m
English
Content preview from Programming Perl, 4th Editionshmctl
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shmctl 
shmctlID,CMD,ARG
This function calls the System V IPC syscall,
shmctl(2). Before calling, you should use IPC::SysV to get the correct constant definitions.
If CMD is IPC_STAT, then ARG
must be a variable that will hold the returned shmid_ds structure. Like ioctl and fcntl, the function returns undef for error, “0
but true” for zero, and the actual return value
otherwise.
This function is available only on machines supporting System V IPC.
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