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xz: Don't fail if stdin doesn't support O_NONBLOCK.

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It's a problem at least on OpenBSD which doesn't support
O_NONBLOCK on e.g. /dev/null. I'm not surprised if it's
a problem on other OSes too since this behavior is allowed
in POSIX-1.2008.

The code relying on this behavior was committed in June 2013
and included in 5.1.3alpha released on 2013-10-26. Clearly
the development releases only get limited testing.
This commit is contained in:
Lasse Collin 2015-01-07 19:08:06 +02:00
parent d2d484647d
commit f0f1f6c723
1 changed files with 7 additions and 11 deletions
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18
src/xz/file_io.c
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@ -393,7 +393,10 @@ io_open_src_real(file_pair *pair)
#ifdef TUKLIB_DOSLIKE
setmode(STDIN_FILENO, O_BINARY);
#else
// Enable O_NONBLOCK for stdin.
// Try to set stdout to non-blocking mode. It won't work
// e.g. on OpenBSD if stdout is e.g. /dev/null. In such
// case we proceed as if stdout were non-blocking anyway
// (in case of /dev/null it will be in practice).
stdin_flags = fcntl(STDIN_FILENO, F_GETFL);
if (stdin_flags == -1) {
message_error(_("Error getting the file status flags "
@ -402,17 +405,10 @@ io_open_src_real(file_pair *pair)
return true;
}
if ((stdin_flags & O_NONBLOCK) == 0) {
if (fcntl(STDIN_FILENO, F_SETFL,
stdin_flags | O_NONBLOCK) == -1) {
message_error(_("Error setting O_NONBLOCK "
"on standard input: %s"),
strerror(errno));
return true;
}
if ((stdin_flags & O_NONBLOCK) == 0
&& fcntl(STDIN_FILENO, F_SETFL,
stdin_flags | O_NONBLOCK) != -1)
restore_stdin_flags = true;
}
#endif
#ifdef HAVE_POSIX_FADVISE
// It will fail if stdin is a pipe and that's fine.