Comments on: using select on a fifo http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/ code is freedom -- patching my itch Tue, 24 Jan 2012 19:58:01 +0000 hourly 1 http://wordpress.org/?v=3.0.5 By: TOMi http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/comment-page-1/#comment-1027 TOMi Mon, 20 Sep 2010 21:21:34 +0000 http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/#comment-1027 Again, this look like the answer I needed - thanks! Again, this look like the answer I needed – thanks!

]]> By: cfchris6 http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/comment-page-1/#comment-663 cfchris6 Wed, 15 Oct 2008 10:38:59 +0000 http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/#comment-663 Thanks for the hint, this helped me out of misery :) Thanks for the hint, this helped me out of misery :)

]]> By: Schnouki http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/comment-page-1/#comment-656 Schnouki Sun, 14 Sep 2008 15:57:58 +0000 http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/#comment-656 Thanks for the tip, it's just what I was looking for! Thanks for the tip, it’s just what I was looking for!

]]> By: Aron Rubin http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/comment-page-1/#comment-607 Aron Rubin Wed, 12 Mar 2008 01:11:51 +0000 http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/#comment-607 You would need to use clearerr. Actually that is a major problem with GIOChannel is that there is no way to clear the EOF (that I can find). Standard IO has clearerr which clears both errors and EOF status. This is an idle reading function from one of my programs (sanitized a little): <pre> static gboolean parser_read_icb( SimExec *sim ) { SimExec *sim; char buf[64] = "", *str; gsize bytes_read = 0, curpos, endpos; ScenarioStream *ss = NULL; g_return_val_if_fail( IS_SIM_EXEC(sim), FALSE ); ss = sim->priv->parser; g_return_val_if_fail( sim->priv->output_fp, FALSE ); clearerr( sim->priv->output_fp ); if( sim->priv->status == SIM_EXEC_RUNNING ) { curpos = ftell( sim->priv->output_fp ); fseek( sim->priv->output_fp, 0, SEEK_END ); endpos = ftell( sim->priv->output_fp ); fseek( sim->priv->output_fp, curpos, SEEK_SET ); if( endpos - curpos priv->output_fp ); bytes_read = fread( buf, 1, sizeof(buf), sim->priv->output_fp ); if( bytes_read priv->output_fp ) || ferror( sim->priv->output_fp )) ) { if( sim->priv->status != SIM_EXEC_RUNNING ) { fclose( sim->priv->output_fp ); sim->priv->output_fp = NULL; return( FALSE ); } } else if( bytes_read > 0 ) { for( str = buf; *str; str++ ) if( *str == '\\n' ) ss->lineno++; ss->pspool = sxml_parse( ss->pspool, &ss->pslen, buf, bytes_read, (SXMLStartTagFunc)stream_start, (SXMLEndTagFunc)stream_end, (SXMLCharsFunc)scenario_chars, ss ); } return( TRUE ); } </pre> You would need to use clearerr. Actually that is a major problem with GIOChannel is that there is no way to clear the EOF (that I can find). Standard IO has clearerr which clears both errors and EOF status. This is an idle reading function from one of my programs (sanitized a little):

static gboolean parser_read_icb( SimExec *sim ) {
SimExec *sim;
char buf[64] = “”, *str;
gsize bytes_read = 0, curpos, endpos;
ScenarioStream *ss = NULL;

g_return_val_if_fail( IS_SIM_EXEC(sim), FALSE );

ss = sim->priv->parser;

g_return_val_if_fail( sim->priv->output_fp, FALSE );

clearerr( sim->priv->output_fp );
if( sim->priv->status == SIM_EXEC_RUNNING ) {
curpos = ftell( sim->priv->output_fp );
fseek( sim->priv->output_fp, 0, SEEK_END );
endpos = ftell( sim->priv->output_fp );
fseek( sim->priv->output_fp, curpos, SEEK_SET );
if( endpos – curpos priv->output_fp );
bytes_read = fread( buf, 1, sizeof(buf), sim->priv->output_fp );
if( bytes_read priv->output_fp ) ||
ferror( sim->priv->output_fp )) ) {
if( sim->priv->status != SIM_EXEC_RUNNING ) {
fclose( sim->priv->output_fp );
sim->priv->output_fp = NULL;
return( FALSE );
}
} else if( bytes_read > 0 ) {
for( str = buf; *str; str++ )
if( *str == ‘\\n’ )
ss->lineno++;
ss->pspool =
sxml_parse( ss->pspool, &ss->pslen, buf, bytes_read,
(SXMLStartTagFunc)stream_start,
(SXMLEndTagFunc)stream_end,
(SXMLCharsFunc)scenario_chars, ss );
}
return( TRUE );
}

]]> By: Jeff Schroeder http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/comment-page-1/#comment-606 Jeff Schroeder Mon, 10 Mar 2008 13:36:30 +0000 http://www.outflux.net/blog/archives/2008/03/09/using-select-on-a-fifo/#comment-606 Very informative post Kees, keep it up. Very informative post Kees, keep it up.

]]>