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#ifndef _UNISTD_H
#define _UNISTD_H
#include <stddef.h>
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
long read(int fd, void* buffer, size_t length);
long write(int fd, const void* buffer, size_t length);
int close(int fd);
long lseek(int fd, long offset, int whence);
void* sbrk(long increment);
int brk(void* address);
#endif
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