[RISU 4/9] Adjust tracefile open for write

[Richard Henderson]

Truncate the new output file.  Rely on umask to remove
group+other file permissions, if desired.

Signed-off-by: Richard Henderson <address@hidden>
---
 risu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/risu.c b/risu.c
index 1c66885..f404d8f 100644
--- a/risu.c
+++ b/risu.c
@@ -368,7 +368,7 @@ int main(int argc, char **argv)
             comm_fd = ismaster ? STDOUT_FILENO : STDIN_FILENO;
         } else {
             if (ismaster) {
-                comm_fd = open(trace_fn, O_WRONLY | O_CREAT, S_IRWXU);
+                comm_fd = open(trace_fn, O_WRONLY | O_CREAT | O_TRUNC, 0666);
             } else {
                 comm_fd = open(trace_fn, O_RDONLY);
             }
-- 
2.20.1