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package Term::Emulator; |
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use strict; |
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|
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use IO::Pty; |
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use IO::Tty qw/ TIOCSWINSZ TCGETA TCSETA ICANON ISIG IEXTEN ECHO ECHOE ECHOKE ECHOCTL PENDIN ICRNL IXON IXANY IMAXBEL BRKINT OPOST ONLCR TIOCGETP TIOCSETN /; |
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use Term::Emulator::Parser; |
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|
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use IO::Handle; |
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use Carp; |
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use Time::HiRes qw/ time sleep /; |
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|
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our $STDIN, $STDOUT, $STDERR; |
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open $STDIN, "<&=", \*STDIN or die; |
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open $STDOUT, ">&=", \*STDOUT or die; |
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open $STDERR, ">&=", \*STDERR or die; |
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|
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sub new { |
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my ($class, %args) = @_; |
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my $self = bless {}, $class; |
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|
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my $width = exists $args{'width'} ? delete $args{'width'} : 80; |
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my $height = exists $args{'height'} ? delete $args{'height'} : 24; |
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|
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$self->{'term'} = Term::Emulator::Parser->new(width => $width, height => $height); |
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$self->{'pty'} = IO::Pty->new; |
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$self->{'pid'} = undef; |
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|
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$self->{'buffers'} = { |
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ptysend => '', |
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}; |
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|
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$self->set_size($width, $height); |
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|
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return $self; |
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} |
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|
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sub set_size { |
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my ($self, $width, $height) = @_; |
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|
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# TODO - kill WINCH the subproccess |
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# TODO - update the Term::Emulator::Parser size |
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|
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ioctl $self->pty->slave, TIOCSWINSZ, pack "S!S!S!S!", $height, $width, $height, $width; |
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|
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return $self; |
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} |
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|
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sub spawn { |
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# based on IO::Pty::Easy v0.03 |
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my ($self, @program) = @_; |
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my $slave = $self->pty->slave; |
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|
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croak "Can't spawn a process when one is already running!" |
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if $self->is_active; |
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|
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# for returning errors from the child process |
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my ($readp, $writep); |
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unless ( pipe($readp, $writep) ) { |
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croak "Failed to create a pipe"; |
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} |
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$writep->autoflush(1); |
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|
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# fork the child |
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my $pid = fork; |
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croak "Couldn't fork" unless defined $pid; |
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|
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unless ( $pid ) { |
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# child process |
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close $readp; |
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|
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$self->pty->make_slave_controlling_terminal; |
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close $self->pty; |
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$slave->set_raw; |
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|
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# reopen STD{IN,OUT,ERR} to use the pty |
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eval { |
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open($STDIN, "<&", $slave->fileno) or croak "Couldn't reopen STDIN for reading: $!"; |
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open($STDOUT, ">&", $slave->fileno) or croak "Couldn't reopen STDOUT for writing: $!"; |
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open($STDERR, ">&", $slave->fileno) or croak "Couldn't reopen STDERR for writing: $!"; |
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}; |
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warn "t: $@" if $@; |
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die "t: $@" if $@; |
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|
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close $slave; |
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|
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system("stty","sane"); |
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|
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exec(@program); |
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|
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# exec failed, tell our parent what happened |
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print $writep $! + 0; |
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carp "Cannot exec(@program): $!"; |
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|
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exit 1; |
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} |
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|
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# parent process continues |
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close $writep; |
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$self->{'pid'} = $pid; |
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|
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$self->pty->close_slave; |
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$self->pty->set_raw; |
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|
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# this will block until EOF (exec killed the filehandle) or we get the error (exec failed) |
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my $errno; |
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my $read_bytes = sysread($readp, $errno, 256); |
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|
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unless ( defined $read_bytes ) { |
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# something went bad wrong with the sysread |
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my $err = $!; |
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kill TERM => $pid; |
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close $readp; |
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# wait up to 2 seconds for the process to die |
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my $starttime = time; |
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sleep 0.01 while time() - $starttime < 2 and $self->is_active; |
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if ( time() - $starttime >= 2 ) { # harmless race condition |
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# beat the living crap out of the process |
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kill KILL => $pid; |
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} |
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croak "Cannot sync with child: $err"; |
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} |
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|
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close $readp; |
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|
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if ( $read_bytes > 0 ) { |
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# child couldn't exec |
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$errno = $errno + 0; |
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$self->_wait_for_inactive; |
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croak "Cannot exec(@program): $errno"; |
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} |
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|
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return $self; |
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} |
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|
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sub userinput { |
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my ($self, $input) = @_; |
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$self->term->userinput($input); |
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$self->_move_term_sendbuf; |
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$self->work_for(0); |
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return $self; |
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} |
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|
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sub key { |
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my ($self, $key) = @_; |
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$self->term->key($key); |
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$self->_move_term_sendbuf; |
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$self->work_for(0); |
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return $self; |
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} |
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|
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sub work_for { |
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my ($self, $time) = @_; |
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my $start = time; |
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my $ptyfn = fileno($self->pty); |
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my $loops = 0; |
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while ( 1 ) { |
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my $readvec = ''; |
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vec($readvec, $ptyfn, 1) = 1; |
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|
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my $writevec = ''; |
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if ( length $self->{'buffers'}->{'ptysend'} ) { |
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vec($writevec, $ptyfn, 1) = 1; |
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} |
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|
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my $len = ($start + $time) - time; |
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if ( $len < 0 ) { |
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last if $loops; |
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$len = 0; |
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} |
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my $nfound = select($readvec, $writevec, undef, $len); |
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last unless $nfound; # if no handles have been written to, we've finished our time chunk |
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|
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# check for reads |
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if ( vec($readvec, $ptyfn, 1) ) { |
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# pty can read |
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|
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my $buf = ''; |
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my $n = sysread $self->pty, $buf, 16384; |
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if ( $n == 0 ) { |
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# EOF |
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$self->kill if $self->is_active; |
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last; |
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} |
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$self->term->parse($buf); # pass data sent from the pty slave to the terminal |
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$self->_move_term_sendbuf; |
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} |
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|
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# check for writes if we have outstanding buffers |
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if ( vec($writevec, $ptyfn, 1) ) { |
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my $nchars = syswrite $self->pty, $self->{'buffers'}->{'ptysend'}; |
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if ( $nchars ) { |
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$self->{'buffers'}->{'ptysend'} = substr $self->{'buffers'}->{'ptysend'}, $nchars; |
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} |
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} |
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|
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# TODO: check for error conditions |
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$loops++; |
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} |
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|
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return $self; |
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} |
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|
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sub _move_term_sendbuf { |
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my ($self) = @_; |
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my $buf = $self->term->output; |
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if ( length $buf ) { |
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$self->{'buffers'}->{'ptysend'} .= $buf; |
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$self->term->output = ''; |
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} |
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} |
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|
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sub is_active { |
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my ($self) = @_; |
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|
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return 0 unless defined $self->{'pid'}; |
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if ( kill 0, $self->{'pid'} ) { |
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return 1; |
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} else { |
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undef $self->{'pid'}; |
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} |
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} |
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|
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sub kill { |
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my ($self, $signal) = @_; |
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$signal = "KILL" unless defined $signal; |
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|
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return 0 unless $self->is_active; |
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return kill $signal, $self->{'pid'}; |
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} |
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|
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sub stop_it_in { |
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my ($self, $maxtime) = @_; |
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$maxtime = 5 unless defined $maxtime; |
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return 0 unless $self->is_active; |
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|
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kill KILL => $self->{'pid'}; |
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my $killtime = time; |
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while ( time() - $killtime < $maxtime ) { |
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return 1 if not $self->is_active; |
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sleep 0.05; |
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} |
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|
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kill TERM => $self->{'pid'}; |
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|
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sleep 0.01; |
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return $self->is_active; |
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} |
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|
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sub _wait_for_inactive { |
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my ($self) = @_; |
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sleep 0.01 while $self->is_active; |
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} |
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|
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sub pty { $_[0]->{'pty'} } |
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sub term { $_[0]->{'term'} } |
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|
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1; |
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