taglinefilesource code
PROT_SOCK151net/ipv4/af_inet.cbase = PROT_SOCK+1+(start % 1024);
PROT_SOCK152net/ipv4/af_inet.cif (base <= PROT_SOCK) 
PROT_SOCK154net/ipv4/af_inet.cbase += PROT_SOCK+(start % 1024);
PROT_SOCK823net/ipv4/af_inet.cif (snum < PROT_SOCK && !suser())