Package: perl
Version: 5.14.2-1
Severity: normal
Tags: patch
Hi,
while compiling perl 5.14.2 on GNU/Hurd, I ran into what it seems a
undefined POSIX behaviour in ext/POSIX/t/sysconf.t.
my $fd = POSIX::open($fifo, O_RDWR)
or skip("could not open $fifo ($!)", 3 * @path_consts_fifo);
according to the POSIX open()[1] about O_RDWR,
The result is undefined if this flag is applied to a FIFO.
.... which is actually our case.
Apparently Linux and *FreeBSD (and maybe also OSes) accept this
behaviour, but on GNU/Hurd this causes the open() call to block
undefinitely. Given there's nothing done with the FIFO if not querying
{,f}pathconf() values, the proposed solution I attached is to change
the opening mode to "O_RDONLY | O_NONBLOCK".
[1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html
Thanks,
--
Pino
--- a/ext/POSIX/t/sysconf.t
+++ b/ext/POSIX/t/sysconf.t
@@ -130,7 +130,7 @@
or skip("could not create fifo $fifo ($!)", 2 * 3 * @path_consts_fifo);
SKIP: {
- my $fd = POSIX::open($fifo, O_RDWR)
+ my $fd = POSIX::open($fifo, O_RDONLY | O_NONBLOCK)
or skip("could not open $fifo ($!)", 3 * @path_consts_fifo);
for my $constant (@path_consts_fifo) {
