SYMLINK(2) System Calls SYMLINK(2)
NAME
symlink - make a symbolic link to a file
SYNOPSIS
#include <unistd.h>
int symlink(
const char *name1,
const char *name2);
int symlinkat(
const char *name1,
int fd,
const char *name2);
DESCRIPTION
The
symlink() function creates a symbolic link
name2 to the file
name1.
Either name may be an arbitrary pathname, the files need not be on the
same file system, and
name1 may be nonexistent.
The file to which the symbolic link points is used when an
open(2) operation is performed on the link. A
stat() operation performed on a
symbolic link returns the linked-to file, while an
lstat() operation
returns information about the link itself. See
stat(2). Unexpected
results may occur when a symbolic link is made to a directory. To avoid
confusion in applications, the
readlink(2) call can be used to read the
contents of a symbolic link.
The
symlinkat() function behaves similarly to
symlink(); however, when
path2 is a relative path, then it will be looked up relative to the
directory specified by the file descriptor
fd. To look up something in
the current working directory, the special value
AT_FDCWD may be passed
into
fd.
RETURN VALUES
Upon successful completion,
0 is returned. Otherwise,
-1 is returned,
errno is set to indicate the error, and the symbolic link is not made.
ERRORS
The
symlink() and
symlinkat() functions will fail if:
EACCES Search permission is denied for a component of the path
prefix of
name2.
EDQUOT The directory where the entry for the new symbolic link
is being placed cannot be extended because the user's
quota of disk blocks on that file system has been
exhausted; the new symbolic link cannot be created
because the user's quota of disk blocks on that file
system has been exhausted; or the user's quota of inodes
on the file system where the file is being created has
been exhausted.
EEXIST The file referred to by
name2 already exists.
EFAULT The
name1 or
name2 argument points to an illegal address.
EILSEQ The path argument includes non-UTF8 characters and the
file system accepts only file names where all characters
are part of the UTF-8 character codeset.
EIO An I/O error occurs while reading from or writing to the
file system.
ELOOP Too many symbolic links are encountered in translating
name2.
ENAMETOOLONG The length of the
name2 argument exceeds
PATH_MAX, or the
length of a
name2 component exceeds
NAME_MAX while
_POSIX_NO_TRUNC is in effect.
ENOENT A component of the path prefix of
name2 does not exist.
ENOSPC The directory in which the entry for the new symbolic
link is being placed cannot be extended because no space
is left on the file system containing the directory; the
new symbolic link cannot be created because no space is
left on the file system which will contain the link; or
there are no free inodes on the file system on which the
file is being created.
ENOSYS The file system does not support symbolic links.
ENOTDIR A component of the path prefix of
name2 is not a
directory. For
symlinkat(), if
path2 refers to a relative
path and
fd is a valid file descriptor that is not a
directory.
EROFS The file
name2 would reside on a read-only file system.
The
symlinkat() function will fail if:
EBADF The
path2 argument is a relative path, and
fd is not a
valid, open file descriptor or the special value
AT_FDCWD.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
SEE ALSO
cp(1),
link(2),
open(2),
readlink(2),
stat(2),
unlink(2),
attributes(7) May 18, 2007
SYMLINK(2)