This edition reorganizes the information from the previous edition into guidance and reference sections, adds substantially to the sockets guidance material in Sockets General Programming Information and Sockets in the Internet Domain, and also adds the following function calls:
In Protocol-Independent C Sockets API:
In TCP/IP Network Utility Routines API:
dn_find() dn_skipname()
h_errno
putlong()
putshort()
Raccept()
Rbind()
Rconnect()
res_query()
res_querydomain()
res_search()
rexec()
Rgethostbyname()
Rgetsockname()
Rlisten()
In addition, the os2_connect() and os2_gethostbyname() calls have been removed; see connect() and gethostbyname() instead.