This file is indexed.

/usr/lib/bcc/include/bsd/errno.h is in elks-libc 0.16.17-3.1.

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The actual contents of the file can be viewed below.

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/* 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 */