[pulseaudio-tickets] [Bug 73479] New: paplay incorrectly assumes stdin will be open

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73479

          Priority: medium
            Bug ID: 73479
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: paplay incorrectly assumes stdin will be open
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: simongmzlj at gmail.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: tools
           Product: PulseAudio

I ran into this issue after debuging why paplay wouldn't work in a script
called by another program. It looks like this program closes
stdin/stdout/stderr before running the script. This causes this to happen:

open("foo.wav", O_RDONLY|O_NOCTTY|O_CLOEXEC) = 0
fcntl(0, F_GETFD)                       = 0x1 (flags FD_CLOEXEC)
dup2(0, 0)                              = 0
close(0)                                = 0
fstat(0, 0x7fffaa2ce740)                = -1 EBADF (Bad file descriptor)

Open returns 0, as it should, in this case. However the assumption that stdin
is still present causes the dup2/close syscalls to close the filedescriptor
we've just opened and not stdin as intended. This causes paplay to die with a
EBADF error.

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