/usr/include/newlib/sys/fcntl.h is in libnewlib-dev 2.4.0.20160527-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #ifndef _SYS_FCNTL_H_
#define _SYS_FCNTL_H_
#include <sys/_default_fcntl.h>
/* We want to support O_BINARY for the open syscall.
For example, the Demon debug monitor has a separate
flag value for "rb" vs "r". */
#define _FBINARY 0x10000
#define O_BINARY _FBINARY
#endif /* _SYS_FCNTL_H_ */
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