note 77137 added to function.posix-mkfifo

A way to have a non-blocking pipe reader is to check first if the pipe exists. If so, then read from the pipe, otherwise do other stuff. This will work assuming that the writer creates the pipe, writes on it, and after that deletes the pipe. This is a blocking writer: <?php $pipe="/tmp/pipe"; $mode=0600; if(!file_exists($pipe)) { // create the pipe umask(0); posix_mkfifo($pipe,$mode); } $f = fopen($pipe,"w"); fwrite($f,"hello"); //block until there is a reader unlink($pipe); //delete pipe ?> And this is the non-blocking reader: <?php $pipe="/tmp/pipe"; if(!file_exists($pipe)) { echo "I am not blocked!"; } else { //block and read from the pipe $f = fopen($pipe,"r"); echo fread($f,10); } ?> ---- Server IP: 80.64.47.13 Probable Submitter: 213.73.41.37 ---- Manual Page -- http://www.php.net/manual/en/function.posix-mkfifo.php Edit -- https://master.php.net/note/edit/77137 Del: integrated -- https://master.php.net/note/delete/77137/integrated Del: useless -- https://master.php.net/note/delete/77137/useless Del: bad code -- https://master.php.net/note/delete/77137/bad+code Del: spam -- https://master.php.net/note/delete/77137/spam Del: non-english -- https://master.php.net/note/delete/77137/non-english Del: in docs -- https://master.php.net/note/delete/77137/in+docs Del: other reasons-- https://master.php.net/note/delete/77137 Reject -- https://master.php.net/note/reject/77137 Search -- https://master.php.net/manage/user-notes.php