host prints the string msg
to all its users.
It returns 0 if successful.
NOTE:
All routines in librpc and libyp
have been incorporated into libsocket.
libyp and libsocket have been retained
so that existing Makefiles will continue to work.
New code should be linked with libsocket.
rpc info
program number:
WALLPROG
procs:
WALLPROC_WALL
takes string as argument (wrapstring), returns no arguments;
executes wall on remote host with string