rtf_create.3

rtlinux-3.1源代码

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.TH "rtf_create" "3" 
.SH "NAME" 
rtf_create \(em create a realtime fifo 
.SH "SYNOPSIS" 
.PP 
.nf 
.ta 8n 16n 24n 32n 40n 48n 56n 64n 72n 
#include <rtl_fifo.h> 
 
int \fBrtf_create\fP(unsigned int \fBfifo\fR, int \fBsize\fR); 
.fi 
.SH "DESCRIPTION" 
.PP 
\fBrtf_create\fP creates a realtime fifo (RT-FIFO) of size \fBsize\fR and assigns it the identifier \fBfifo\fR.  \fBfifo\fR is a value unique within the system, and must be less than RTF_NO. 
.PP 
The RT-FIFO is a mechanism, implemented as a character device, to communicate between realtime tasks and ordinary Linux processes.  The rtf_* functions are used by the realtime tasks;  Linux processes use standard character device access functions such as \fBread(3)\fP, \fBwrite(3)\fP, and \fBselect(3)\fP. 
.SH "RETURN VALUE" 
.PP 
On success, 0 is returned.  On failure, a negative value is returned as described below. 
.SH "ERRORS" 
.IP "-ENODEV" 10 
\fBfifo\fR is greater than or equal to RTF_NO. 
.IP "-EBUSY" 10 
\fBfifo\fR is already in use.  Choose a different ID. 
.IP "-ENOMEM" 10 
\fBsize\fR bytes could not be allocated for the RT-FIFO. 
.SH "NOTES" 
.PP 
This function should only be used in the Linux \fBinit_module()\fP context or in user space via PSC library (please see below). 
RT-FIFOs created in \fBinit_module()\fP should be destroyed with \fBrtf_destroy()\fP in \fBcleanup_module\fP. 
.PP 
\fBrtf_create\fP is a system call made available by PSC,  
the user-level real-time signal library.  It can be called from user space, 
but not from PSC handlers. 
.SH "SEE ALSO" 
\fIrtf_create_handler(3) (link to URL rtf_create_handler.3.html) \fR, \fIrtf_destroy(3) (link to URL rtf_destroy.3.html) \fR, \fIrtf_get(3) (link to URL rtf_get.3.html) \fR, \fIrtf_put(3) (link to URL rtf_put.3.html) \fR 
.PP 
\(co1997 Jerry Epplin. 
.PP 
Modifications for RTLinux 2.x and 3.x by Michael Barabanov. \(co2001 FSMLabs Inc. 
.PP 
All rights reserved. 
...\" created by instant / docbook-to-man, Thu 26 Jul 2001, 11:19