mptctl_syscall_down(9) centos man page | unix.com

MPTCTL_SYSCALL_DOWN(9)					       Message-based devices					    MPTCTL_SYSCALL_DOWN(9)

NAME
       mptctl_syscall_down - Down the MPT adapter syscall semaphore.

SYNOPSIS
       int mptctl_syscall_down(MPT_ADAPTER * ioc, int nonblock);

ARGUMENTS
       ioc
	   Pointer to MPT adapter

       nonblock
	   boolean, non-zero if O_NONBLOCK is set

DESCRIPTION
       All of the ioctl commands can potentially sleep, which is illegal with a spinlock held, thus we perform mutual exclusion here.

       Returns negative errno on error, or zero for success.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    MPTCTL_SYSCALL_DOWN(9)