Socket creation errors (UNIX domain)

EPROTONOSUPPORT

The protocol type or the specified protocol is not supported within this domain.

EMFILE

The per-process descriptor table is full.

ENFILE

The system file table is full.

EACCESS

Permission to create a socket of the specified type and/or protocol is denied.

ENOBUFS

Insufficient buffer space is available. The socket cannot be created until sufficient resources are freed.