hi Mats,All On Dec 10, 2:14pm in "RE: netdb.h, reentra", Wichmann, Mats D wrote: > > I don't find netinet/tcp.h in the SUS myself but Andrew > is the expert in that area. > Sorry -I was looking forward at Version 3 of the Single UNIX Specification and POSIX 1003.1-2001. The netinet/tcp.h header is not in SUSv2, but came into SUSv3 and POSIX 1003.1-2001 from the Open Group Networking Services Issue 5 v2 spec. regards Andrew