From: Michal Nazarewicz <mina86@xxxxxxxxxx>
The command_close_bidi_pipe() function will insist on closing both
input and output pipes returned by command_bidi_pipe(). With this
change it is possible to close one of the pipes in advance and
pass undef as an argument.
Signed-off-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
---
perl/Git.pm | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/perl/Git.pm b/perl/Git.pm
index 6bc9a3c..d6e6c9e 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -426,12 +426,25 @@ Note that you should not rely on whatever actually is in C<CTX>;
currently it is simply the command name but in future the context might
have more complicated structure.
+C<PIPE_IN> and C<PIPE_OUT> may be C<undef> if they have been closed prior to
+calling this function. This may be useful in a query-response type of
+commands where caller first writes a query and later reads response, eg:
+
+ my ($pid, $in, $out, $ctx) = $r->command_bidi_pipe('cat-file --batch-check');
+ print $out "000000000\n";
+ close $out;
+ while (<$in>) { ... }
+ $r->command_close_bidi_pipe($pid, $in, undef, $ctx);
+
+This idiom may prevent potential dead locks caused by data sent to the output
+pipe not being flushed and thus not reaching the executed command.
+
=cut
sub command_close_bidi_pipe {
local $?;
my ($self, $pid, $in, $out, $ctx) = _maybe_self(@_);
- _cmd_close($ctx, $in, $out);
+ _cmd_close($ctx, grep defined, $in, $out);
waitpid $pid, 0;
if ($? >> 8) {
throw Git::Error::Command($ctx, $? >>8);
--
1.8.1.3.572.g32bae1f
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