v7 man page for link

LINK(2) 							System Calls Manual							   LINK(2)

NAME
       link - link to a file

SYNOPSIS
       link(name1, name2)
       char *name1, *name2;

DESCRIPTION
       A link to name1 is created; the link has the name name2.  Either name may be an arbitrary path name.

SEE ALSO
       ln(1), unlink(2)

DIAGNOSTICS
       Zero  is  returned  when  a link is made; -1 is returned when name1 cannot be found; when name2 already exists; when the directory of name2
       cannot be written; when an attempt is made to link to a directory by a user other than the super-user; when an attempt is made to link to a
       file on another file system; when a file has too many links.

ASSEMBLER
       (link = 9.)
       sys link; name1; name2

																	   LINK(2)