see their respective manual pages.
.TP
.B EACCES
-(For Unix domain sockets, which are identified by pathname)
+(For UNIX domain sockets, which are identified by pathname)
Write permission is denied on the destination socket file,
or search permission is denied for one of the directories
the path prefix.
.B MSG_CONFIRM
flag is a Linux extension.
.SH NOTES
-The prototypes given above follow the Single Unix Specification,
+The prototypes given above follow the Single UNIX Specification,
as glibc2 also does; the
.I flags
argument was \fIint\fP in 4.x BSD, but \fIunsigned int\fP in libc4 and libc5;