/usr/lib/bcc/include/bsd/errno.h is in elks-libc 0.16.17-3.1ubuntu2.
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 | /* make sure EWOULDBLOCK doesn't screw us up */
#ifndef _BSD_ERRNO_H
#define _BSD_ERRNO_H
#include_next <errno.h>
#undef EWOULDBLOCK
#define EWOULDBLOCK EAGAIN
#endif /* _BSD_ERRNO_H */
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