IOPERM

Section: Linux Programmer's Manual (2)
Updated: January 21, 1993
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NAME

ioperm - set port input/output permissions  

SYNOPSIS

#include <unistd.h>

int ioperm(unsigned long from, unsigned long num, int turn_on);  

DESCRIPTION

Ioperm sets the port access permission bits for the process for num bytes starting from port address from to the value turn_on. The use of ioperm require root privileges.

Only the first 0x3ff I/O ports can be specified in this manner. For more ports, the iopl function must be used.  

RETURN VALUE

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.  

CONFORMING TO

ioperm is Linux specific.  

SEE ALSO

iopl(2)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
SEE ALSO

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