text: #include <unistd.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <sys/syscall.h>
  
  extern long int syscall (long int __sysno, ...) __THROW;
  
  int pipe2(int fd[2], int flag)
  {
  	if (!flag) return pipe(fd);
  	int ret = syscall(SYS_pipe2, fd, flag);
  	if (ret != -ENOSYS) return -ret;
  	ret = pipe(fd);
  	if (ret) return ret;
  	if (flag & O_CLOEXEC) {
  		syscall(SYS_fcntl, fd[0], F_SETFD, FD_CLOEXEC);
  		syscall(SYS_fcntl, fd[1], F_SETFD, FD_CLOEXEC);
  	}
  	if (flag & O_NONBLOCK) {
  		syscall(SYS_fcntl, fd[0], F_SETFL, O_NONBLOCK);
  		syscall(SYS_fcntl, fd[1], F_SETFL, O_NONBLOCK);
  	}
  	return 0;
  }
  