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link.2freebsd

BSD mandoc

NAME

link - make a hard file link

LIBRARY

Lb libc

SYNOPSIS

In unistd.h Ft int Fn link const char *name1 const char *name2

DESCRIPTION

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

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

The object pointed at by the Fa name1 argument must exist for the hard link to succeed and both Fa name1 and Fa name2 must be in the same file system. The Fa name1 argument may not be a directory.

RETURN VALUES

Rv -std link

ERRORS

The Fn link system call will fail and no link will be created if:

Bq Er ENOTDIR

A component of either path prefix is not a directory.

Bq Er ENAMETOOLONG

A component of either pathname exceeded 255 characters, or entire length of either path name exceeded 1023 characters.

Bq Er ENOENT

A component of either path prefix does not exist.

Bq Er EOPNOTSUPP

The file system containing the file named by Fa name1 does not support links.

Bq Er EMLINK

The link count of the file named by Fa name1 would exceed 32767.

Bq Er EACCES

A component of either path prefix denies search permission.

Bq Er EACCES

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

Bq Er ELOOP

Too many symbolic links were encountered in translating one of the pathnames.

Bq Er ENOENT

The file named by Fa name1 does not exist.

Bq Er EEXIST

The link named by Fa name2 does exist.

Bq Er EPERM

The file named by Fa name1 is a directory.

Bq Er EPERM

The file named by Fa name1 has its immutable or append-only flag set, see the chflags(2) manual page for more information.

Bq Er EPERM

The parent directory of the file named by Fa name2 has its immutable flag set.

Bq Er EXDEV

The link named by Fa name2 and the file named by Fa name1 are on different file systems.

Bq Er 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.

Bq Er 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.

Bq Er EIO

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

Bq Er EROFS

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

Bq Er EFAULT

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

SEE ALSO

chflags(2), readlink(2), symlink(2), unlink(2)

STANDARDS

The Fn link system call is expected to conform to St -p1003.1-90 .

HISTORY

The Fn link function appeared in AT&T System v7 .

The Fn link system call traditionally allows the super-user to link directories which corrupts the file system coherency. This implementation no longer permits it.