pidrec
struct pidrec prec;
struct pidrec *p = ≺
if (read(Pfd, p, sizeof (struct pidrec)) !=
sizeof (struct pidrec)) {
struct pidrec prec;
register struct pidrec *p = ≺
if ((bytes_read = read(Pfd, p, sizeof (struct pidrec))) !=
sizeof (struct pidrec)) {
while (read(Pfd, p, sizeof (struct pidrec)) > 0)