Header <unistd.h>

Functions provided by this header:

int close(int fd)

int execve(const char *path, char *const argv[], char *const envp[])

int fork(void)

ssize_t read(int fildes, void *buf, size_t nbyte)

ssize_t write(int fildes, const void *buf, size_t nbyte)

ssize_t lseek(int filedes, ssize_t offset, int whence)

Typedefs provided by this header:

typedef int64_t ssize_t

Named constants provided by this header:

STDIN_FILENO

STDOUT_FILENO

STDERR_FILENO

SEEK_SET

seek relative to beginning of file

SEEK_CUR

seek relative to current file position

SEEK_END

seek relative to end of file