ioperm

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  pro-
       cess  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)