FCALL(3)						     Library Functions Manual							  FCALL(3)

NAME

       fcall - recreate packet delimiters

SYNOPSIS

       Fctlfd = open(".../ctl", ORDWR);
       Fwrite(ctlfd, "push fcall", 10);

DESCRIPTION

       Fcall  is a stream module (see stream(3)) that can be pushed onto a connection to a 9P file server. The function of the module is to recre-
       ate packet delimiters lost in transmission.  The 9P protocol demands that network connections preserve delimiters between messages  written
       to  the file server.  Stream based protocols, like TCP, are unable to preserve delimiters. The delimiters must be recreated by the receiver
       before a packet is read by a file system.

       Fcall examines a data stream and identifies 9P messages from their type. The length of the message is computed from the	header.   Data	is
       collected  and  buffered  by  the  stream module until an entire 9P message has been assembled. A single message is then delimited and sent
       upstream to be read by a file server.

SEE ALSO

       stream(3), ip(3), exportfs(4), srv(4)

SOURCE

       /sys/src/9/port/stfcall.c

																	  FCALL(3)