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int link(const char *src, const char *new);
src: [in] points the the file we want to add a link to.
new: [in] points to the path for the new link.
Creates a new (hard) link to a file. There is no way to distinguish the links.
On success zero is returned. On error, -1 is returned and errno is
set to one of the following values:
EPERM: the file system does not support hard links or
oldpath is the . or .. entry of a directory.
EXDEV, EFAULT, EACCESS, ENAMETOOLONG,
ENOENT, ENOTDIR, ENOMEM, EROFS,
EEXIST, EMLINK, ELOOP and. ESPC.
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