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From 35608a1658fe75c79ca53d96aea6cf7cb2a98615 Mon Sep 17 00:00:00 2001
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From: Tony Cook <tony@develop-help.com>
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Date: Thu, 9 May 2019 09:52:30 +1000
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Subject: [PATCH] (perl #122112) a simpler fix for pclose() aborted by a signal
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This change results in a zombie child process for the lifetime of
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the process, but I think that's the responsibility of the signal
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handler that aborted pclose().
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We could add some magic to retry (and retry and retry) waiting on
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child process as we rewind (since there's no other way to remove
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the zombie), but the program has chosen implicitly to abort the
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wait() done by pclose() and it's best to honor that.
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If we do choose to retry the wait() we might be blocking an attempt
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by the process to terminate, whether by exit() or die().
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If a program does need more flexible handling there's always
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pipe()/fork()/exec() and/or the various event-driven frameworks on
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CPAN.
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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doio.c | 12 +++++++++++-
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t/io/pipe.t | 2 --
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2 files changed, 11 insertions(+), 3 deletions(-)
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diff --git a/doio.c b/doio.c
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index 0cc4e55404..05a06968dc 100644
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--- a/doio.c
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+++ b/doio.c
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@@ -1779,7 +1779,17 @@ Perl_io_close(pTHX_ IO *io, GV *gv, bool not_implicit, bool warn_on_fail)
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if (IoIFP(io)) {
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if (IoTYPE(io) == IoTYPE_PIPE) {
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- const int status = PerlProc_pclose(IoIFP(io));
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+ PerlIO *fh = IoIFP(io);
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+ int status;
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+
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+ /* my_pclose() can propagate signals which might bypass any code
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+ after the call here if the signal handler throws an exception.
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+ This would leave the handle in the IO object and try to close it again
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+ when the SV is destroyed on unwind or global destruction.
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+ So NULL it early.
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+ */
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+ IoOFP(io) = IoIFP(io) = NULL;
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+ status = PerlProc_pclose(fh);
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if (not_implicit) {
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STATUS_NATIVE_CHILD_SET(status);
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retval = (STATUS_UNIX == 0);
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diff --git a/t/io/pipe.t b/t/io/pipe.t
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index 1d01db6af6..fc3071300d 100644
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--- a/t/io/pipe.t
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+++ b/t/io/pipe.t
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@@ -255,9 +255,7 @@ close \$fh;
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PROG
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print $prog;
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my $out = fresh_perl($prog, {});
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- $::TODO = "not fixed yet";
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cmp_ok($out, '!~', qr/refcnt/, "no exception from PerlIO");
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- undef $::TODO;
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# checks that that program did something rather than failing to
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# compile
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cmp_ok($out, '=~', qr/Died at/, "but we did get the exception from die");
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--
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2.20.1
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