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.TH rtapi_region "3rtapi" "2006-10-12" "LinuxCNC Documentation" "RTAPI"
.SH NAME
rtapi_region \- functions to manage I/O memory regions
.SH SYNTAX
.HP
void *rtapi_request_region(unsigned long \fIbase\fR, unsigned long int \fIsize\fR, const char *\fIname\fR)
.HP
void rtapi_release_region(unsigned long \fIbase\fR, unsigned long int \fIsize\fR)
.SH ARGUMENTS
.IP \fIbase\fR
The base address of the I/O region
.IP \fIsize\fR
The size of the I/O region
.IP \fIname\fR
The name to be shown in /proc/ioports
.SH DESCRIPTION
\fBrtapi_request_region\fR reserves I/O memory starting at \fIbase\fR
and going for \fIsize\fR bytes.
.SH REALTIME CONSIDERATIONS
May be called from realtime init/cleanup code only.
.SH BUGS
On kernels before 2.4.0, \fBrtapi_request_region\fR always suceeds.
.SH RETURN VALUE
\fBrtapi_request_region\fR returns NULL if the allocation fails, and a non-NULL
value otherwise.
\fBrtapi_release_region\fR has no return value.
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