June 2002
Beginner
759 pages
80h 42m
English
pipe
pipe readhandle, writehandle
Opens a pair of connected pipes. This call is almost
always used right before a fork, after which the pipes reader
should close writehandle, and the
writer should close readhandle.
(Otherwise, the pipe won’t indicate end-of-file to the reader when
the writer closes it.) Note that if you set up a loop of piped
processes, deadlock can occur unless you are very careful. In
addition, note that Perl’s pipes use standard I/O buffering, so
you may need to set $| on your
writehandle to flush after each output
command, depending on the application. See select
filehandle.