Backport #5723: Backport r33567 and r33573 (Ruby fails when standard input is closed)

• Status: Closed
• Assignee: -

[rdmoore (Randal Moore)]

If the ruby process is launched with its standard input closed, it does not behave very well. The following output was logged by the ruby process under these circumstances. The attached source file can be used to produce a minimal executable that duplicates the issue. Note that this appears to be something that changed between 1.9.2 and 1.9.3.

[BUG] rb_update_max_fd: invalid fd (0) given.
ruby 1.9.3p0 (2011-10-30 revision 33570) [i686-linux]

-- Control frame information -----------------------------------------------
c:0001 p:---- s:0002 b:0002 l:000001 d:000001 TOP

-- C level backtrace information -------------------------------------------
-e [0x8173762]
-e [0x81b7de8]
-e(rb_bug+0x35) [0x81b7e85]
-e [0x8073427]
-e [0x8079be0]
-e [0x806da5a]
-e(ruby_init+0x97) [0x805b317]
-e [0x8058887]
/lib/libc.so.6(__libc_start_main+0xdc) [0x3cedec]
-e [0x8058781]

-- Other runtime information -----------------------------------------------

0: can't convert false into String (TypeError)

[kosaki (Motohiro KOSAKI)]

One question. Why don't you use /dev/null? Which behavior did you expected?

Thank you.

[nobu (Nobuyoshi Nakada)]

• Tracker changed from Bug to Backport
• Project changed from Ruby master to Backport193
• Target version deleted (1.9.3)

Backport r33567 and r33573.

[rdmoore (Randal Moore)]

Ruby is being forked as a subprocess by a service which runs on both windows and linux. With ruby 1.8, a closed STDIN worked and was portable to both platforms. As a work-around, we are in the middle of switching to using NULL on Windows and /dev/null on Linux. This will likely be a better long term solution for our service, as other programs are also unhappy with closed STDIN.

We expect our work-around will work, so this issue is low priority. Just thought someone could look into the regression.

Thanks

[ayumin (Ayumu AIZAWA)]

• Subject changed from Ruby fails when standard input is closed to Backport r33567 and r33573 (Ruby fails when standard input is closed)

[kosaki (Motohiro KOSAKI)]

• Status changed from Open to Closed

I commited this as r34452.