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Diffstat (limited to 'test/iobug1.awk')
| -rw-r--r-- | test/iobug1.awk | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/test/iobug1.awk b/test/iobug1.awk new file mode 100644 index 00000000..5606d022 --- /dev/null +++ b/test/iobug1.awk @@ -0,0 +1,53 @@ +# From arnold@f7.net Fri Nov 26 11:53:12 2004 +# X-Envelope-From: james@nocrew.org +# X-Envelope-To: <arnold@skeeve.com> +# To: bug-gawk@gnu.org +# Subject: gawk 3.1.4: reproducible hang, regression from 3.1.3 +# From: James Troup <james@nocrew.org> +# Date: Fri, 26 Nov 2004 03:14:05 +0000 +# Message-ID: <877jo9qp36.fsf@shiri.gloaming.local> +# User-Agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux) +# MIME-Version: 1.0 +# Content-Type: text/plain; charset=us-ascii +# +# +# Hi, +# +# A Debian user reported[0] gawk 3.1.4 broke a (relatively) complex +# program that makes extensive use of awk, called 'apt-move'. I finally +# managed to reduced the problem down to a 3 line test case, enclosed +# below[1]. +# +# I believe the problem comes from the following code, introduced in +# 3.1.4: +# +# [io.c, line 560] +# | for (rp = red_head; rp != NULL; rp = rp->next) { +# | if ((rp->flag & RED_EOF) && tree->type == Node_redirect_pipein) { +# | if (rp->pid != -1) +# | wait_any(0); +# | } +# +# The problem is that, if we have an existing redirect which is a simple +# file redirect[b] and it's hit EOF and we try to create a new '|' +# redirect[c], this new code will try to wait(2) and if there are any +# other redirects which _did_ spawn a child (like [a]) the wait() will +# hang indefinitely waiting for it to exit. +# +# Hope that makes sense :) +# +# -- +# James +# +# [0] http://bugs.debian.org/263964 +# +# [1] +# ================================================================================ +#!/usr/bin/gawk -f + +BEGIN { + printf "" | "cat" # [a] + getline line < "/dev/null" # [b] + "true" | getline line # [c] +} +# ================================================================================ |