W3cubDocs

/Perl 5.20

shmctl

shmctl ID,CMD,ARG

Calls the System V IPC function shmctl. You'll probably have to say

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 shmid_ds structure. Returns like ioctl: undef for error; "0 but true" for zero; and the actual return value otherwise. See also SysV IPC in perlipc and IPC::SysV documentation.

Portability issues: shmctl in perlport.

© 1993–2016 Larry Wall and others
Licensed under the GNU General Public License version 1 or later, or the Artistic License.
The Perl logo is a trademark of the Perl Foundation.
http://perldoc.perl.org/5.20.2/functions/shmctl.html