/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like
fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */
/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like
fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */