[Xen-changelog] [xen master] tools/livepatch: Set stdout and stderr unbuffered

[patchbot@xxxxxxx]

commit a81163ef0fcaeefcf15c561b37255a06ce8e661f
Author:     Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
AuthorDate: Wed Dec 14 07:51:54 2016 +0000
Commit:     Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
CommitDate: Wed Dec 14 15:27:19 2016 -0500

    tools/livepatch: Set stdout and stderr unbuffered
    
    Using both stdout and stderr interleaved without newlines can result in
    strange output when using line buffered mode (e.g. a terminal) or when
    fully buffered (e.g. redirected to a file). Set stdout to unbuffered mode
    to fix this (stderr is always unbuffered by default).
    
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
    Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
 tools/misc/xen-livepatch.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/misc/xen-livepatch.c b/tools/misc/xen-livepatch.c
index f6c7c8a..56ae5aa 100644
--- a/tools/misc/xen-livepatch.c
+++ b/tools/misc/xen-livepatch.c
@@ -330,7 +330,6 @@ int action_func(int argc, char *argv[], unsigned int idx)
         }
 
         printf(".");
-        fflush(stdout);
         usleep(DELAY);
     } while ( ++retry < RETRIES );
 
@@ -416,6 +415,12 @@ int main(int argc, char *argv[])
 {
     int i, j = 0, ret;
 
+    /*
+     * Set stdout to be unbuffered to avoid having to fflush when
+     * printing without a newline.
+     */
+    setvbuf(stdout, NULL, _IONBF, 0);
+
     if ( argc  <= 1 )
     {
         show_help();
--
generated by git-patchbot for /home/xen/git/xen.git#master

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