read(fd, address, length) { return syscall(0, fd, address, length) } write(fd, address, length) { syscall(1, fd, address, length) } open(file, flags, mode) { return syscall(2, file, flags, mode) } close(fd) { return syscall(3, fd) } mmap(address, length, protection, flags) { return syscall(9, address, length, protection, flags) } munmap(address, length) { return syscall(11, address, length) } clone(flags, stack) { return syscall(56, flags, stack) } exit(code) { syscall(60, code) } getcwd(buffer, length) { return syscall(79, buffer, length) } chdir(path) { return syscall(80, path) } rename(old, new) { return syscall(82, old, new) } mkdir(path, mode) { return syscall(83, path, mode) } rmdir(path) { return syscall(84, path) } unlink(file) { return syscall(87, file) }