file.h
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/* This is file FILE.H */
#ifndef _FILE_H_
#define _FILE_H_
#include <fcntl.h>
#ifndef L_SET
# define L_SET 0 /* seek from beginning. */
# define L_CURR 1 /* seek from current position. */
# define L_INCR 1 /* ditto. */
# define L_XTND 2 /* seek from end. */
#endif
#ifndef R_OK
# define R_OK 4 /* test whether readable. */
# define W_OK 2 /* test whether writable. */
# define X_OK 1 /* test whether execubale. */
# define F_OK 0 /* test whether exist. */
#endif
#endif