>From POSIX:

In the symbolic_mode strings, the op characters '+' and '-'
shall be interpreted relative to an assumed initial mode of
a=rw.
---
 mkfifo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mkfifo.c b/mkfifo.c
index a09f4f5..390381b 100644
--- a/mkfifo.c
+++ b/mkfifo.c
@@ -14,7 +14,7 @@ usage(void)
 int
 main(int argc, char *argv[])
 {
-       mode_t mode = 0, mask;
+       mode_t mode = 0666, mask;
        int mflag = 0, ret = 0;
 
        ARGBEGIN {
-- 
2.21.0


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