[Patch v2] opensm/main.c: force stdout to be line-buffered

[Yevgeny Kliteynik <kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>]

When stdout is assigned to a terminal, it is line-buffered.
But when opensm's stdout is redirected to a file, stdout
becomes block-buffered, which means that '\n' won't cause
the buffer to be flushed.

Forcing stdout to always be line-buffered and to have a
more predictable behavior when used as "opensm > some_file".

Signed-off-by: Yevgeny Kliteynik <kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
---

Changes since V1:
  - replacing setlinebuf() with an ANSI C compliant setvbuf()
  - Note: similar patch for ibv_asyncwatch was accepted by Roland:

      http://www.mail-archive.com/linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org/msg04161.html

 opensm/opensm/main.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/opensm/opensm/main.c b/opensm/opensm/main.c
index 0093aa7..6e6c733 100644
--- a/opensm/opensm/main.c
+++ b/opensm/opensm/main.c
@@ -618,6 +618,9 @@ int main(int argc, char *argv[])
 		{NULL, 0, NULL, 0}	/* Required at the end of the array */
 	};

+	/* force stdout to be line-buffered */
+	setvbuf(stdout, NULL, _IOLBF, 0);
+
 	/* Make sure that the opensm and complib were compiled using
 	   same modes (debug/free) */
 	if (osm_is_debug() != cl_is_debug()) {
-- 
1.5.1.4


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