* [PATCH] input_pipe: error handling + TTY support
@ 2023-10-16 11:09 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2023-10-16 11:09 UTC (permalink / raw)
To: spew
---
lib/PublicInbox/InputPipe.pm | 69 +++++++++++++++++++++++++++---------
1 file changed, 53 insertions(+), 16 deletions(-)
diff --git a/lib/PublicInbox/InputPipe.pm b/lib/PublicInbox/InputPipe.pm
index 60a9f01f..5f109886 100644
--- a/lib/PublicInbox/InputPipe.pm
+++ b/lib/PublicInbox/InputPipe.pm
@@ -5,31 +5,68 @@
package PublicInbox::InputPipe;
use v5.12;
use parent qw(PublicInbox::DS);
-use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
+use PublicInbox::Syscall qw(EPOLLIN);
+use POSIX ();
+
+sub unblock_tty ($) {
+ my ($self) = @_;
+ my $t = POSIX::Termios->new;
+ my $fd = fileno(my $in = $self->{sock});
+ $t->getattr($fd) or croak("tcgetattr($in/$fd): $!");
+ my $vmin = $t->getcc(POSIX::VMIN);
+ my $vtime = $t->getcc(POSIX::VTIME);
+ return if $vmin == 1 && $vtime == 0;
+ $t->setcc(POSIX::VMIN, 1);
+ $t->setcc(POSIX::VTIME, 0);
+ $t->setattr($fd, POSIX::TCSANOW) or croak("tcsetattr($in/$fd): $!");
+ $t->setcc(POSIX::VMIN, $vmin);
+ $t->setcc(POSIX::VTIME, $vtime);
+ $self->{termios} = $t;
+}
sub consume {
my ($in, $cb, @args) = @_;
my $self = bless { cb => $cb, args => \@args }, __PACKAGE__;
- eval { $self->SUPER::new($in, EPOLLIN|EPOLLET) };
- return $self->requeue if $@; # regular file
- $in->blocking(0); # pipe or socket
+ eval { $self->SUPER::new($in, EPOLLIN) };
+ if ($@) {
+ $self->{-need_rq} = 1;
+ $self->requeue;
+ } elsif (-p $in || -s _) {
+ $in->blocking(0);
+ } elsif (-t _) { # not sure I know what I'm doing w/ terminals
+ unblock_tty($self);
+ }
+}
+
+sub close {
+ my ($self) = @_;
+ if (my $t = delete($self->{termios})) {
+ my $fd = fileno(my $in = $self->{sock} // return);
+ $t->setattr($fd, POSIX::TCSANOW) or
+ croak("tcsetattr($in/$fd): $!");
+ }
+ $self->{-need_rq} ? delete($self->{sock}) : $self->SUPER::close
}
sub event_step {
my ($self) = @_;
my $r = sysread($self->{sock} // return, my $rbuf, 65536);
- if ($r) {
- $self->{cb}->(@{$self->{args}}, $rbuf);
- return $self->requeue; # may be regular file or pipe
- }
- if (defined($r)) { # EOF
- $self->{cb}->(@{$self->{args}}, '');
- } elsif ($!{EAGAIN}) {
- return;
- } else { # another error
- $self->{cb}->(@{$self->{args}}, undef)
- }
- $self->{sock}->blocking ? delete($self->{sock}) : $self->close
+ eval {
+ if ($r) {
+ $self->{cb}->(@{$self->{args}}, $rbuf);
+ $self->requeue if $self->{-need_rq};
+ } elsif (defined($r)) { # EOF
+ $self->{cb}->(@{$self->{args}}, '');
+ $self->close
+ } elsif ($!{EAGAIN}) { # rely on EPOLLIN
+ } elsif ($!{EINTR}) { # rely on EPOLLIN for sockets/pipes/tty
+ $self->requeue if $self->{-need_rq};
+ } else { # another error
+ $self->{cb}->(@{$self->{args}}, undef);
+ $self->close;
+ }
+ };
+ $self->close if $@;
}
1;
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