symlink - make a new name for a file
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 con-
tents 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 direc-
tories 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 own-
ership 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 set.
If newpath exists it will not be overwritten.
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
EPERM The filesystem containing newpath does not support
the creation of symbolic links.
EFAULT oldpath or newpath points outside your accessible
EACCES Write access to the directory containing newpath is
not allowed for the process's effective uid, or one
of the directories in newpath did not allow search
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
ENOTDIR A component used as a directory in newpath is not,
in fact, a directory.
ENOMEM Insufficient kernel memory was available.
EROFS newpath is on a read-only filesystem.
EEXIST newpath already exists.
ELOOP Too many symbolic links were encountered in resolv-
ENOSPC The device containing the file has no room for the
new directory entry.
EIO An I/O error occurred.
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 addi-
tional error codes EDQUOT and ENOSYS. See open(2) re multi-
ple files with the same name, and NFS.
readlink(2), link(2), unlink(2), rename(2), open(2),