日期: 2017 年 4 月 10 日

error: call to ‘__open_missing_mode’ declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments

使用open函数的时候，如果在第二个参数中使用了O_CREAT，就必须添加第三个参数：创建文件时赋予的初始权。

In function ‘open’,
    inlined from ‘test_detector_ffmpeg’ at ./src/ff_darknet.c:421:15:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:50:4: error: call to ‘__open_missing_mode’ declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments
    __open_missing_mode ();
    ^
compilation terminated due to -Wfatal-errors.

建议使用如下参数创建文件：

//0755
fd = open(file_path,O_CREAT | O_APPEND | O_WRONLY,S_IRWXU|S_IRUSR|S_IXUSR|S_IROTH|S_IXOTH);