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IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. --> <html> <head> <title>rename</title> <body bgcolor=#ffffff> <h2 align=center>rename</h2> <h4 align=center>OS/161 Reference Manual</h4> <h3>Name</h3> <p> rename - rename or move a file </p> <h3>Library</h3> <p> Standard C Library (libc, -lc) </p> <h3>Synopsis</h3> <p> <tt>#include <unistd.h></tt><br> <br> <tt>int</tt><br> <tt>rename(const char *</tt><em>oldname</em><tt>, const char *</tt><em>newname</em><tt>);</tt> </p> <h3>Description</h3> <p> The file (or other object) referenced by <em>oldname</em> is given the name <em>newname</em>, and the name <em>oldname</em> is removed. If <em>newname</em> already exists, it is removed as well. (The semantics for removing files and directories described under <A HREF=remove.html>remove</A> and <A HREF=rmdir.html>rmdir</A> must be honored.) </p> <p> If <em>newname</em> exists, it must be a directory if and only if <em>oldname</em> also is. </p> <p> If components of the path prefix of <em>newname</em> do not exist or are not directories, rename fails. Additionally, <em>oldname</em> and <em>newname</em> must refer to names on the same filesystem. </p> <p> If <em>oldname</em> and <em>newname</em> are the same file, rename succeeds and the state of the filesystem is not altered. This is true even if they are not in the same directory. (POSIX says so. This is widely considered a bug in POSIX.) </p> <p> Rename must be atomic; no other process on the system should be able to see the filesystem in a state where both (or neither) <em>oldname</em> and <em>newname</em> name the file. Additionally, if the system crashes, at least one name for the file must remain. (If you are implementing a file system with crash recovery, a crash during rename must, after recovery, produce a volume where the rename has either occurred or not occurred; no intermediate states may be exposed.) </p> <p> If <em>oldname</em> is a directory, <em>newname</em> must not refer to a subdirectory of <em>oldname</em>, as this would create a (detached) cycle in the directory tree. </p> <p> Renaming (or overwriting) the <tt>.</tt> or <tt>..</tt> entries in directories is prohibited. </p> <h3>Return Values</h3> <p> On success, <tt>rename</tt> returns 0. On error, -1 is returned, and <A HREF=errno.html>errno</A> is set according to the error encountered. </p> <h3>Errors</h3> <p> The following error codes should be returned under the conditions given. Other error codes may be returned for other errors not mentioned here. <table width=90%> <tr><td width=5% rowspan=13> </td> <td width=10% valign=top>ENODEV</td> <td>The device prefix of one of the names did not exist.</td></tr> <tr><td valign=top>ENOTDIR</td> <td>A non-final component of one of the names was not a directory.</td></tr> <tr><td valign=top>ENOENT</td> <td>A non-final component of <em>newname</em> did not exist.</td></tr> <tr><td valign=top>ENOENT</td> <td><em>oldname</em> does not exist.</td></tr> <tr><td valign=top>ENOTDIR</td> <td><em>oldname</em> is a directory, and <em>newname</em> is not.</td></tr> <tr><td valign=top>EISDIR</td> <td><em>oldname</em> is not a directory, and <em>newname</em> is.</td></tr> <tr><td valign=top>ENOTEMPTY</td><td><em>newname</em> is a directory, and it is not empty.</td> <tr><td valign=top>EXDEV</td> <td>The two names are on different filesystems.</td></tr> <tr><td valign=top>EINVAL</td> <td><em>newname</em> is a subdirectory of <em>oldname</em>.</td></tr> <tr><td valign=top>EINVAL</td> <td>An attempt was made to rename a <tt>.</tt> or <tt>..</tt> entry.</td></tr> <tr><td valign=top>ENOSPC</td> <td>The filesystem involved is full.</td></tr> <tr><td valign=top>EIO</td> <td>A hard I/O error occurred.</td></tr> <tr><td valign=top>EFAULT</td> <td>One of the arguments was an invalid pointer.</td></tr> </table> </p> <p> As with rmdir, attempts to rename with <em>newname</em> equal to <tt>..</tt> may generate either EINVAL or ENOTEMPTY. </p> </body> </html>