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OpenDarwin 7.2.1 - man page for link (opendarwin section 2)

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LINK(2) 			     BSD System Calls Manual				  LINK(2)

NAME
     link -- make a hard file link

SYNOPSIS
     #include <unistd.h>

     int
     link(const char *name1, const char *name2);

DESCRIPTION
     The link() function call atomically creates the specified directory entry (hard link) name2
     with the attributes of the underlying object pointed at by name1 If the link is successful:
     the link count of the underlying object is incremented; name1 and name2 share equal access
     and rights to the underlying object.

     If name1 is removed, the file name2 is not deleted and the link count of the underlying
     object is decremented.

     Name1 must exist for the hard link to succeed and both name1 and name2 must be in the same
     file system.  As mandated by POSIX.1 name1 may not be a directory.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned
     and errno is set to indicate the error.

ERRORS
     Link() will fail and no link will be created if:

     [ENOTDIR]		A component of either path prefix is not a directory.

     [ENAMETOOLONG]	A component of a pathname exceeded {NAME_MAX} characters, or an entire
			path name exceeded {PATH_MAX} characters.

     [ENOENT]		A component of either path prefix does not exist.

     [EACCES]		A component of either path prefix denies search permission.

     [EACCES]		The requested link requires writing in a directory with a mode that
			denies write permission.

     [ELOOP]		Too many symbolic links were encountered in translating one of the path-
			names.

     [ENOENT]		The file named by name1 does not exist.

     [EEXIST]		The link named by name2 does exist.

     [EPERM]		The file named by name1 is a directory.

     [EXDEV]		The link named by name2 and the file named by name1 are on different file
			systems.

     [ENOSPC]		The directory in which the entry for the new link is being placed cannot
			be extended because there is no space left on the file system containing
			the directory.

     [EDQUOT]		The directory in which the entry for the new link is being placed cannot
			be extended because the user's quota of disk blocks on the file system
			containing the directory has been exhausted.

     [EIO]		An I/O error occurred while reading from or writing to the file system to
			make the directory entry.

     [EROFS]		The requested link requires writing in a directory on a read-only file
			system.

     [EFAULT]		One of the pathnames specified is outside the process's allocated address
			space.

SEE ALSO
     symlink(2), unlink(2)

STANDARDS
     The link() function is expected to conform to IEEE Std 1003.1-1988 (``POSIX.1'').

4th Berkeley Distribution		 January 12, 1994		4th Berkeley Distribution
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