man 2 open
The effective mode is modified by the process's umask in
              the usual way: in the absence of a default ACL, the mode
              of the created file is (mode & ~umask).

【 在 wjie (faint) 的大作中提到: 】
: 这样写不是rw-rw-rw-？
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FROM 113.108.77.*