NAME

msgctl - SysV IPC message control operations


SYNOPSIS

msgctl ID,CMD,ARG


DESCRIPTION

Calls the System V IPC function msgctl(2). If CMD is &IPC_STAT, then ARG must be a variable which will hold the returned msqid_ds structure. Returns like ioctl: the undefined value for error, ``0 but true'' for zero, or the actual return value otherwise.