/* * unistd.h */ #ifndef _UNISTD_H #define _UNISTD_H #include #include #include #include __extern __noreturn _exit(int); __extern int open(const char *, int, ...); __extern int close(int); __extern ssize_t read(int, void *, size_t); __extern ssize_t write(int, const void *, size_t); __extern int isatty(int); /* Standard file descriptor numbers. */ #define STDIN_FILENO 0 #define STDOUT_FILENO 1 #define STDERR_FILENO 2 #endif /* _UNISTD_H */