Fix do_read() in case a multiple read is needed

Fix a bug where we tried to read more than needed if a second read
is needed.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/trace-input.c b/trace-input.c
index 0d50bf0..9e61d20 100644
--- a/trace-input.c
+++ b/trace-input.c
@@ -62,7 +62,7 @@ static int do_read(struct tracecmd_input *handle, void *data, int size)
         int r;
 
         do {
-                r = read(handle->fd, data, size);
+                r = read(handle->fd, data, size - tot);
                 tot += r;
 
                 if (!r)