OSF

NAME

link − Creates an additional directory entry for an existing file on current file system

SYNOPSIS

int link (
const char ∗path1,
const char ∗path2 );

PARAMETERS

path1Points to the pathname of an existing file. 

path2Points to the pathname for the directory entry to be created.  If the path2 parameter names a symbolic link, an error is returned. 

DESCRIPTION

The link() function creates an additional hard link (directory entry) for an existing file. Both the old and the new link share equal access rights to the underlying object.  The link() function atomically creates a new link for the existing file and increments the link count of the file by one. 

Both the path1 and path2 parameters must reside on the same file system. A hard link to a directory cannot be created. 

Upon successful completion, the link() function marks the st_ctime field of the file for update, and marks the st_ctime and st_mtime fields of the directory containing the new entry for update. 

NOTES

AES Support Level:
Full use

RETURN VALUES

Upon successful completion, the link() function returns a value of 0 (zero). If the link() function fails, a value of -1 is returned, no link is created, and errno is set to indicate the error. 

ERRORS

If the link() function fails, errno may be set to one of the following values:

[ENOENT]The file named by the path1 parameter does not exist or the path1 or path2 parameter is an empty string. 

[EFAULT]Either the path1 or path2 parameter is an invalid address. 

[EEXIST]The link named by the path2 parameter already exists. 

[EPERM]The file named by the path1 parameter is a directory. 

[EXDEV]The link named by the path2 parameter and the file named by the path1 parameter are on different file systems. 

[EACCES]The requested link requires writing in a directory with a mode that denies write permission, or a component of either the path1 or path2 parameter denies search permission. 

[EMLINK]The number of links to the file named by path1 would exceed LINK_MAX. 

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

[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. 

[ELOOP]Too many links were encountered in translating either path1 or path2. 

[ENAMETOOLONG]
The length of the path1 or path2 string exceeds PATH_MAX or a pathname component is longer than NAME_MAX. 

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

RELATED INFORMATION

Functions: unlink(2)

Commands: link(1)