NAME
symlink
—
make symbolic link to a file
SYNOPSIS
#include <fcntl.h>
#include <unistd.h>
int
symlink
(const
char *name1, const char
*name2);
int
symlinkat
(const
char *name1, int
fd, const char
*name2);
DESCRIPTION
A symbolic link name2 is created to name1 (name2 is the name of the file created, name1 is the string used in creating the symbolic link). Either name may be an arbitrary path name; the files need not be on the same file system, and the file specified by name1 need not exist at all.
The
symlinkat
()
function is equivalent to
symlink
()
except that where name2 specifies a relative path, the
newly created symbolic link is created relative to the directory associated
with file descriptor fd instead of the current working
directory.
If
symlinkat
()
is passed the special value AT_FDCWD
(defined in
<fcntl.h>
) in the
fd parameter, the current working directory is used
and the behavior is identical to a call to
symlink
().
RETURN VALUES
Upon successful completion, a zero value is returned. If an error occurs, the error code is stored in errno and a -1 value is returned.
ERRORS
The symbolic link succeeds unless:
- [
ENOTDIR
] - A component of the name2 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
] - The named file does not exist.
- [
EACCES
] - A component of the name2 path prefix denies search permission.
- [
ELOOP
] - Too many symbolic links were encountered in translating the pathname.
- [
EEXIST
] - name2 already exists.
- [
EIO
] - An I/O error occurred while making the directory entry for name2, or allocating the inode for name2, or writing out the link contents of name2.
- [
EROFS
] - The file name2 would reside on a read-only file system.
- [
ENOSPC
] - The directory in which the entry for the new symbolic link is being placed cannot be extended because there is no space left on the file system containing the directory.
- [
ENOSPC
] - The new symbolic link cannot be created because there is no space left on the file system that will contain the symbolic link.
- [
ENOSPC
] - There are no free inodes on the file system on which the symbolic link is being created.
- [
EDQUOT
] - The directory in which the entry for the new symbolic 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.
- [
EDQUOT
] - The new symbolic link cannot be created because the user's quota of disk blocks on the file system that will contain the symbolic link has been exhausted.
- [
EDQUOT
] - The user's quota of inodes on the file system on which the symbolic link is being created has been exhausted.
- [
EIO
] - An I/O error occurred while making the directory entry or allocating the inode.
- [
EFAULT
] - name1 or name2 points outside the process's allocated address space.
Additionally, symlinkat
() will fail
if:
- [
EBADF
] - The name2 argument does not specify an absolute path
and the fd argument is neither
AT_FDCWD
nor a valid file descriptor open for reading.
SEE ALSO
STANDARDS
The symlink
() and
symlinkat
() functions conform to
IEEE Std 1003.1-2008 (“POSIX.1”).
HISTORY
The symlink
() function call appeared in
4.2BSD. The symlinkat
()
function call appeared in OpenBSD 5.0.