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- int close(int fd);
- ssize_t read(int fd, void *buf, size_t count);
- ssize_t write(int fd, void const *buf, size_t count);
- off_t lseek(int fd, off_t offset, int whence);
- pid_t fork(void);
- pid_t vfork(void);
- uint64_t brk(uint64_t end_brk);
- void *sbrk(int64_t increment);
- int64_t chdir(char *dest_path);
- int execv(const char* path, char * const argv[]);
- extern int usleep(useconds_t usec);
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