a C standard library for fx Casio calculators
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fxlibc/include/fcntl.h

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#ifndef __LIB_FCNTL_H__
# define __LIB_FCNTL_H__
#include <stddef.h>
#include <stdint.h>
/* also defined in <stdio.h> */
#define SEEK_SET 0 /* Seek from beginning of file. */
#define SEEK_CUR 1 /* Seek from current position. */
#define SEEK_END 2 /* Seek from end of file. */
/*
** Open FILE and return a new file descriptor for it, or -1 on error.
** OFLAG determines the type of access used. If O_CREAT or O_TMPFILE is set
** in OFLAG, the third argument is taken as a `mode_t', the mode of the
** created file.
*/
extern int open(const char *pathname, int flags, ...);
#endif /*__LIB_FCNTL_H__*/