_PATH_DEVZERO
{ if ((fdzero = open(_PATH_DEVZERO, O_RDWR | O_CLOEXEC, 0000)) == -1) \
if ((fd = open(_PATH_DEVZERO, O_RDONLY)) == -1)
int fd = open(_PATH_DEVZERO, O_RDONLY);
srcdev = _PATH_DEVZERO;