fread from /dev/ttyS0 without EOF

Hi, I have a GSM modem connected to /dev/ttyS0 and would like to use php to communicate with the modem. Writing works perfectly like this: $fp=fopen("/dev/ttyS0","r+"); fwrite($fp,"AT+CMGL\r"); but reading is a little problem because if the modem for example answers to the "AT+CMGL" message I sent to it with the command above it does NOT put an EOF at the end of the stream. For example the following code while (!feof($fp)) { print=fgetc($fp); } blocks after it read the last char and waits for the next char that will never come. I tried to use filesize() and fseek ($fp,0,SEEK_END); print ftell($fp); to find out the length of the answer of the modem but it didn't work. Anybody knows a solution? For example a timeout parameter of fread, fgetc? Or whatever ... Thanks Tobias -- Sign the Petition for a Software Patent Free Europe: http://petition.eurolinux.org/ Tobias Fritz tobias.fritz@gmx.net http://tobias.fritz.net/