[cs631apue] File permission Control use oflag and mode

[Hongyi Shen]

In open() function:

int open(const char *pathname, int oflag, ... /* mode_t mode */ );


Both *oflag* and *mode could *control the file's permission. So both of
them call stat() inside?

*Question: What if they are conflict with each other? (like O_RDONLY and
mode 0777 together)*


When doing the HW, my function's option is open(dst, O_WRONLY | O_CREAT |
O_TRUNC, src_st.st_mode), it works fine when I copy a executable shell
script.

But when I chmod 777 to the source script and use program to copy, the
target file's permission remains "-rwxr-xr-x". This is where this problem
from.
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