From: Randal L. Schwartz Date: Mon, 15 May 2000 18:52:42 +0000 (-0700) Subject: Delete chat2 as requested by Randal. X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=50f338d87df77eb836fe2a83fce72fbd3e40e1df;p=p5sagit%2Fp5-mst-13.2.git Delete chat2 as requested by Randal. Subject: Re: perlfaq8 coyness Message-ID: p4raw-id: //depot/perl@6555 --- diff --git a/MANIFEST b/MANIFEST index add7787..5dbb1b2 100644 --- a/MANIFEST +++ b/MANIFEST @@ -700,7 +700,6 @@ lib/bytes.pm Pragma to enable byte operations lib/bytes_heavy.pl Support routines for byte pragma lib/cacheout.pl Manages output filehandles when you need too many lib/charnames.pm Character names -lib/chat2.pl Obsolete ipc library (use Comm.pm etc instead) lib/complete.pl A command completion subroutine lib/constant.pm For "use constant" lib/ctime.pl A ctime workalike diff --git a/lib/chat2.pl b/lib/chat2.pl deleted file mode 100644 index 504fa7e..0000000 --- a/lib/chat2.pl +++ /dev/null @@ -1,379 +0,0 @@ -# chat.pl: chat with a server -# -# This library is no longer being maintained, and is included for backward -# compatibility with Perl 4 programs which may require it. -# -# In particular, this should not be used as an example of modern Perl -# programming techniques. -# -# Suggested alternative: Socket -# -# Based on: V2.01.alpha.7 91/06/16 -# Randal L. Schwartz (was ) -# multihome additions by A.Macpherson@bnr.co.uk -# allow for /dev/pts based systems by Joe Doupnik - -package chat; - -require 'sys/socket.ph'; - -if( defined( &main'PF_INET ) ){ - $pf_inet = &main'PF_INET; - $sock_stream = &main'SOCK_STREAM; - local($name, $aliases, $proto) = getprotobyname( 'tcp' ); - $tcp_proto = $proto; -} -else { - # XXX hardwired $PF_INET, $SOCK_STREAM, 'tcp' - # but who the heck would change these anyway? (:-) - $pf_inet = 2; - $sock_stream = 1; - $tcp_proto = 6; -} - - -$sockaddr = 'S n a4 x8'; -chop($thishost = `hostname`); - -# *S = symbol for current I/O, gets assigned *chatsymbol.... -$next = "chatsymbol000000"; # next one -$nextpat = "^chatsymbol"; # patterns that match next++, ++, ++, ++ - - -## $handle = &chat'open_port("server.address",$port_number); -## opens a named or numbered TCP server - -sub open_port { ## public - local($server, $port) = @_; - - local($serveraddr,$serverproc); - - # We may be multi-homed, start with 0, fixup once connexion is made - $thisaddr = "\0\0\0\0" ; - $thisproc = pack($sockaddr, 2, 0, $thisaddr); - - *S = ++$next; - if ($server =~ /^(\d+)+\.(\d+)\.(\d+)\.(\d+)$/) { - $serveraddr = pack('C4', $1, $2, $3, $4); - } else { - local(@x) = gethostbyname($server); - return undef unless @x; - $serveraddr = $x[4]; - } - $serverproc = pack($sockaddr, 2, $port, $serveraddr); - unless (socket(S, $pf_inet, $sock_stream, $tcp_proto)) { - ($!) = ($!, close(S)); # close S while saving $! - return undef; - } - unless (bind(S, $thisproc)) { - ($!) = ($!, close(S)); # close S while saving $! - return undef; - } - unless (connect(S, $serverproc)) { - ($!) = ($!, close(S)); # close S while saving $! - return undef; - } -# We opened with the local address set to ANY, at this stage we know -# which interface we are using. This is critical if our machine is -# multi-homed, with IP forwarding off, so fix-up. - local($fam,$lport); - ($fam,$lport,$thisaddr) = unpack($sockaddr, getsockname(S)); - $thisproc = pack($sockaddr, 2, 0, $thisaddr); -# end of post-connect fixup - select((select(S), $| = 1)[0]); - $next; # return symbol for switcharound -} - -## ($host, $port, $handle) = &chat'open_listen([$port_number]); -## opens a TCP port on the current machine, ready to be listened to -## if $port_number is absent or zero, pick a default port number -## process must be uid 0 to listen to a low port number - -sub open_listen { ## public - - *S = ++$next; - local($thisport) = shift || 0; - local($thisproc_local) = pack($sockaddr, 2, $thisport, $thisaddr); - local(*NS) = "__" . time; - unless (socket(NS, $pf_inet, $sock_stream, $tcp_proto)) { - ($!) = ($!, close(NS)); - return undef; - } - unless (bind(NS, $thisproc_local)) { - ($!) = ($!, close(NS)); - return undef; - } - unless (listen(NS, 1)) { - ($!) = ($!, close(NS)); - return undef; - } - select((select(NS), $| = 1)[0]); - local($family, $port, @myaddr) = - unpack("S n C C C C x8", getsockname(NS)); - $S{"needs_accept"} = *NS; # so expect will open it - (@myaddr, $port, $next); # returning this -} - -## $handle = &chat'open_proc("command","arg1","arg2",...); -## opens a /bin/sh on a pseudo-tty - -sub open_proc { ## public - local(@cmd) = @_; - - *S = ++$next; - local(*TTY) = "__TTY" . time; - local($pty,$tty) = &_getpty(S,TTY); - die "Cannot find a new pty" unless defined $pty; - $pid = fork; - die "Cannot fork: $!" unless defined $pid; - unless ($pid) { - close STDIN; close STDOUT; close STDERR; - setpgrp(0,$$); - if (open(DEVTTY, "/dev/tty")) { - ioctl(DEVTTY,0x20007471,0); # XXX s/b &TIOCNOTTY - close DEVTTY; - } - open(STDIN,"<&TTY"); - open(STDOUT,">&TTY"); - open(STDERR,">&STDOUT"); - die "Oops" unless fileno(STDERR) == 2; # sanity - close(S); - exec @cmd; - die "Cannot exec @cmd: $!"; - } - close(TTY); - $next; # return symbol for switcharound -} - -# $S is the read-ahead buffer - -## $return = &chat'expect([$handle,] $timeout_time, -## $pat1, $body1, $pat2, $body2, ... ) -## $handle is from previous &chat'open_*(). -## $timeout_time is the time (either relative to the current time, or -## absolute, ala time(2)) at which a timeout event occurs. -## $pat1, $pat2, and so on are regexs which are matched against the input -## stream. If a match is found, the entire matched string is consumed, -## and the corresponding body eval string is evaled. -## -## Each pat is a regular-expression (probably enclosed in single-quotes -## in the invocation). ^ and $ will work, respecting the current value of $*. -## If pat is 'TIMEOUT', the body is executed if the timeout is exceeded. -## If pat is 'EOF', the body is executed if the process exits before -## the other patterns are seen. -## -## Pats are scanned in the order given, so later pats can contain -## general defaults that won't be examined unless the earlier pats -## have failed. -## -## The result of eval'ing body is returned as the result of -## the invocation. Recursive invocations are not thought -## through, and may work only accidentally. :-) -## -## undef is returned if either a timeout or an eof occurs and no -## corresponding body has been defined. -## I/O errors of any sort are treated as eof. - -$nextsubname = "expectloop000000"; # used for subroutines - -sub expect { ## public - if ($_[0] =~ /$nextpat/) { - *S = shift; - } - local($endtime) = shift; - - local($timeout,$eof) = (1,1); - local($caller) = caller; - local($rmask, $nfound, $timeleft, $thisbuf); - local($cases, $pattern, $action, $subname); - $endtime += time if $endtime < 600_000_000; - - if (defined $S{"needs_accept"}) { # is it a listen socket? - local(*NS) = $S{"needs_accept"}; - delete $S{"needs_accept"}; - $S{"needs_close"} = *NS; - unless(accept(S,NS)) { - ($!) = ($!, close(S), close(NS)); - return undef; - } - select((select(S), $| = 1)[0]); - } - - # now see whether we need to create a new sub: - - unless ($subname = $expect_subname{$caller,@_}) { - # nope. make a new one: - $expect_subname{$caller,@_} = $subname = $nextsubname++; - - $cases .= <<"EDQ"; # header is funny to make everything elsif's -sub $subname { - LOOP: { - if (0) { ; } -EDQ - while (@_) { - ($pattern,$action) = splice(@_,0,2); - if ($pattern =~ /^eof$/i) { - $cases .= <<"EDQ"; - elsif (\$eof) { - package $caller; - $action; - } -EDQ - $eof = 0; - } elsif ($pattern =~ /^timeout$/i) { - $cases .= <<"EDQ"; - elsif (\$timeout) { - package $caller; - $action; - } -EDQ - $timeout = 0; - } else { - $pattern =~ s#/#\\/#g; - $cases .= <<"EDQ"; - elsif (\$S =~ /$pattern/) { - \$S = \$'; - package $caller; - $action; - } -EDQ - } - } - $cases .= <<"EDQ" if $eof; - elsif (\$eof) { - undef; - } -EDQ - $cases .= <<"EDQ" if $timeout; - elsif (\$timeout) { - undef; - } -EDQ - $cases .= <<'ESQ'; - else { - $rmask = ""; - vec($rmask,fileno(S),1) = 1; - ($nfound, $rmask) = - select($rmask, undef, undef, $endtime - time); - if ($nfound) { - $nread = sysread(S, $thisbuf, 1024); - if ($nread > 0) { - $S .= $thisbuf; - } else { - $eof++, redo LOOP; # any error is also eof - } - } else { - $timeout++, redo LOOP; # timeout - } - redo LOOP; - } - } -} -ESQ - eval $cases; die "$cases:\n$@" if $@; - } - $eof = $timeout = 0; - do $subname(); -} - -## &chat'print([$handle,] @data) -## $handle is from previous &chat'open(). -## like print $handle @data - -sub print { ## public - if ($_[0] =~ /$nextpat/) { - *S = shift; - } - - local $out = join $, , @_; - syswrite(S, $out, length $out); - if( $chat'debug ){ - print STDERR "printed:"; - print STDERR @_; - } -} - -## &chat'close([$handle,]) -## $handle is from previous &chat'open(). -## like close $handle - -sub close { ## public - if ($_[0] =~ /$nextpat/) { - *S = shift; - } - close(S); - if (defined $S{"needs_close"}) { # is it a listen socket? - local(*NS) = $S{"needs_close"}; - delete $S{"needs_close"}; - close(NS); - } -} - -## @ready_handles = &chat'select($timeout, @handles) -## select()'s the handles with a timeout value of $timeout seconds. -## Returns an array of handles that are ready for I/O. -## Both user handles and chat handles are supported (but beware of -## stdio's buffering for user handles). - -sub select { ## public - local($timeout) = shift; - local(@handles) = @_; - local(%handlename) = (); - local(%ready) = (); - local($caller) = caller; - local($rmask) = ""; - for (@handles) { - if (/$nextpat/o) { # one of ours... see if ready - local(*SYM) = $_; - if (length($SYM)) { - $timeout = 0; # we have a winner - $ready{$_}++; - } - $handlename{fileno($_)} = $_; - } else { - $handlename{fileno(/'/ ? $_ : "$caller\'$_")} = $_; - } - } - for (sort keys %handlename) { - vec($rmask, $_, 1) = 1; - } - select($rmask, undef, undef, $timeout); - for (sort keys %handlename) { - $ready{$handlename{$_}}++ if vec($rmask,$_,1); - } - sort keys %ready; -} - -# ($pty,$tty) = $chat'_getpty(PTY,TTY): -# internal procedure to get the next available pty. -# opens pty on handle PTY, and matching tty on handle TTY. -# returns undef if can't find a pty. -# Modify "/dev/pty" to "/dev/pts" for Dell Unix v2.2 (aka SVR4.04). Joe Doupnik. - -sub _getpty { ## private - local($_PTY,$_TTY) = @_; - $_PTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e; - $_TTY =~ s/^([^']+)$/(caller)[$[]."'".$1/e; - local($pty, $tty, $kind); - if( -e "/dev/pts000" ){ ## mods by Joe Doupnik Dec 1992 - $kind = "pts"; ## SVR4 Streams - } else { - $kind = "pty"; ## BSD Clist stuff - } - for $bank (112..127) { - next unless -e sprintf("/dev/$kind%c0", $bank); - for $unit (48..57) { - $pty = sprintf("/dev/$kind%c%c", $bank, $unit); - open($_PTY,"+>$pty") || next; - select((select($_PTY), $| = 1)[0]); - ($tty = $pty) =~ s/pty/tty/; - open($_TTY,"+>$tty") || next; - select((select($_TTY), $| = 1)[0]); - system "stty nl>$tty"; - return ($pty,$tty); - } - } - undef; -} - -1;