Originální popis anglicky:
symlink - make a new name for a file
Návod, kniha: Linux Programmer's Manual
#include <unistd.h>
int symlink(const char *oldpath, const char
*newpath);
symlink creates a symbolic link named
newpath which contains the
string
oldpath.
Symbolic links are interpreted at run-time as if the contents of the link had
been substituted into the path being followed to find a file or directory.
Symbolic links may contain
.. path components, which (if used at the
start of the link) refer to the parent directories of that in which the link
resides.
A symbolic link (also known as a soft link) may point to an existing file or to
a nonexistent one; the latter case is known as a dangling link.
The permissions of a symbolic link are irrelevant; the ownership is ignored when
following the link, but is checked when removal or renaming of the link is
requested and the link is in a directory with the sticky bit (
S_ISVTX)
set.
If
newpath exists it will
not be overwritten.
On success, zero is returned. On error, -1 is returned, and
errno is set
appropriately.
- EACCES
- Write access to the directory containing newpath is
denied, or one of the directories in the path prefix of newpath did
not allow search permission. (See also path_resolution(2).)
- EEXIST
- newpath already exists.
- EFAULT
- oldpath or newpath points outside your
accessible address space.
- EIO
- An I/O error occurred.
- ELOOP
- Too many symbolic links were encountered in resolving
newpath.
- ENAMETOOLONG
- oldpath or newpath was too long.
- ENOENT
- A directory component in newpath does not exist or
is a dangling symbolic link, or oldpath is the empty string.
- ENOMEM
- Insufficient kernel memory was available.
- ENOSPC
- The device containing the file has no room for the new
directory entry.
- ENOTDIR
- A component used as a directory in newpath is not,
in fact, a directory.
- EPERM
- The filesystem containing newpath does not support
the creation of symbolic links.
- EROFS
- newpath is on a read-only filesystem.
No checking of
oldpath is done.
Deleting the name referred to by a symlink will actually delete the file (unless
it also has other hard links). If this behaviour is not desired, use
link.
SVr4, SVID, POSIX, BSD 4.3. SVr4 documents additional error codes SVr4, SVID,
BSD 4.3, X/OPEN. SVr4 documents additional error codes EDQUOT and ENOSYS. See
open(2) re multiple files with the same name, and NFS.
ln(1),
link(2),
lstat(2),
open(2),
path_resolution(2),
readlink(2),
rename(2),
unlink(2)
