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| author | Lasse Collin <lasse.collin@tukaani.org> | 2015-01-07 19:08:06 +0200 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2015-01-07 19:08:06 +0200 |
| commit | f0f1f6c7235ffa901cf76fe18e33749e200b3eea (patch) | |
| tree | 7164d82508dbebca219ea2026e034e9ee0d5b82e | |
| parent | d2d484647d9d9d679f03c75abb0404f67069271c (diff) | |
| download | xz-f0f1f6c7235ffa901cf76fe18e33749e200b3eea.tar.gz | |
xz: Don't fail if stdin doesn't support O_NONBLOCK.
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.
| -rw-r--r-- | src/xz/file_io.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/src/xz/file_io.c b/src/xz/file_io.c index f135cf7c..bf4462d9 100644 --- a/src/xz/file_io.c +++ b/src/xz/file_io.c @@ -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. |