---
name: "mptctl_syscall_down"
section: "9"
platform: "linux"
package: "linux-manual-3.16"
version: "3.16.56-1+deb8u1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/mptctl_syscall_down"
---

# mptctl\_syscall\_down(9)

Down the MPT adapter syscall semaphore.

## 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