waitfor() should be used so that when / if it's
changed to not poll in a loop, everyone will
benefit.

-seanb

On Wed, Apr 18, 2012 at 10:23:49AM -0400, Chris Travis wrote:
> Sure, but according to our documentation and the "actual?" lib/c/qnx/waitfor.c  it uses stat()  :-)
> http://www.qnx.com/developers/docs/6.5.0/index.jsp?topic=/com.qnx.doc.neutrino_utilities/w/waitfor.html
> plus aside from the definition in libgen.c, waitfor() is not documented. :-(
> 
> -----Original Message-----
> From: Colin Burgess [mailto:community-noreply@qnx.com] 
> Sent: April-18-12 10:11 AM
> To: general-filesystems
> Subject: Re: C API similar to waitfor
> 
> Actually it uses waitfor() - it's in libgen.h
> 
> :-)
> 
> On 12-04-18 10:05 AM, Chris Travis wrote:
> > waitfor uses stat()
> >
> > Here is an example:
> >
> > int waitfor( char *path, unsigned wait_msec, unsigned wait_period_msec 
> > ) {
> > 	struct stat		sbuf;
> > 	unsigned		total = 0, ret;
> >
> > 	do {
> > 		delay( wait_period_msec );
> > 		total += wait_period_msec;
> > 	} while ( (ret = stat( path,&sbuf )) == -1&&  total<  wait_msec );
> > 	if ( total>= wait_msec )
> > 		errno = ETIMEDOUT;
> > 	return ret;
> > }
> >
> > Chris
> >
> >
> > -----Original Message-----
> > From: Chun He [mailto:community-noreply@qnx.com]
> > Sent: April-18-12 2:39 AM
> > To: general-filesystems
> > Subject: C API similar to waitfor
> >
> > need to wait till a path (or a device node) to exists or appear in C program.
> > Is there a C API equal to waitfor command?
> >
> > best regards,
> > Chun
> >
> >
> >
> > _______________________________________________
> >
> > General
> > http://community.qnx.com/sf/go/post92596
> >
> >
> >
> >
> > _______________________________________________
> >
> > General
> > http://community.qnx.com/sf/go/post92605
> >
> 
> --
> cburgess@qnx.com
> 
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post92606
> 
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post92607
> 

PR 77631 is a laundry list of undocumented functions. You'll be happy to learn that waitfor() is on the list.

Steve Reid (stever@qnx.com)
Technical Editor
QNX Software Systems


-----Original Message-----
From: Chris Travis [mailto:community-noreply@qnx.com] 
Sent: Wednesday, April 18, 2012 10:24 AM
To: general-filesystems
Subject: RE: C API similar to waitfor

Sure, but according to our documentation and the "actual?" lib/c/qnx/waitfor.c  it uses stat()  :-) http://www.qnx.com/
developers/docs/6.5.0/index.jsp?topic=/com.qnx.doc.neutrino_utilities/w/waitfor.html
plus aside from the definition in libgen.c, waitfor() is not documented. :-(