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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH RENAME 2 "Sep 29, 2020" .SH NAME rename, renameat \- change the name of a file .SH SYNOPSIS .nf #include \fBint\fR \fBrename\fR(\fBconst char *\fR\fIold\fR, \fBconst char *\fR\fInew\fR); .fi .LP .nf #include \fBint\fR \fBrenameat\fR(\fBint\fR \fIfromfd\fR, \fBconst char *\fR\fIold\fR, \fBint\fR \fItofd\fR, \fBconst char *\fR\fInew\fR); .fi .SS "XPG3" .nf #include \fBint\fR \fBrename\fR(\fBconst char *\fR\fIold\fR, \fBconst char *\fR\fInew\fR); .fi .SH DESCRIPTION The \fBrename()\fR function changes the name of a file. The \fIold\fR argument points to the pathname of the file to be renamed. The \fInew\fR argument points to the new path name of the file. .sp .LP The \fBrenameat()\fR function renames an entry in a directory, possibly moving the entry into a different directory. See \fBfsattr\fR(5). If the \fIold\fR argument is an absolute path, the \fIfromfd\fR is ignored. Otherwise it is resolved relative to the \fIfromfd\fR argument rather than the current working directory. Similarly, if the \fInew\fR argument is not absolute, it is resolved relative to the \fItofd\fR argument. If either \fIfromfd\fR or \fItofd\fR have the value \fBAT_FDCWD\fR, defined in <\fBfcntl.h\fR>, and their respective paths are relative, the path is resolved relative to the current working directory. .sp .LP Current implementation restrictions will cause the \fBrenameat()\fR function to return an error if an attempt is made to rename an extended attribute file to a regular (non-attribute) file, or to rename a regular file to an extended attribute file. .sp .LP If \fIold\fR and \fInew\fR both refer to the same existing file, the \fBrename()\fR and \fBrenameat()\fR functions return successfully and performs no other action. .sp .LP If \fIold\fR points to the pathname of a file that is not a directory, \fInew\fR must not point to the pathname of a directory. If the link named by \fInew\fR exists, it will be removed and \fIold\fR will be renamed to \fInew\fR. In this case, a link named \fInew\fR must remain visible to other processes throughout the renaming operation and will refer to either the file referred to by \fInew\fR or the file referred to as \fIold\fR before the operation began. .sp .LP If \fIold\fR points to the pathname of a directory, \fInew\fR must not point to the pathname of a file that is not a directory. If the directory named by \fInew\fR exists, it will be removed and \fIold\fR will be renamed to \fInew\fR. In this case, a link named \fInew\fR will exist throughout the renaming operation and will refer to either the file referred to by \fInew\fR or the file referred to as \fIold\fR before the operation began. Thus, if \fInew\fR names an existing directory, it must be an empty directory. .sp .LP The \fInew\fR pathname must not contain a path prefix that names \fIold\fR. Write access permission is required for both the directory containing \fIold\fR and the directory containing \fInew\fR. If \fIold\fR points to the pathname of a directory, write access permission is required for the directory named by \fIold\fR, and, if it exists, the directory named by \fInew\fR. .sp .LP If the directory containing \fIold\fR has the sticky bit set, at least one of the following conditions listed below must be true: .RS +4 .TP .ie t \(bu .el o the user must own \fIold\fR .RE .RS +4 .TP .ie t \(bu .el o the user must own the directory containing \fIold\fR .RE .RS +4 .TP .ie t \(bu .el o \fIold\fR must be writable by the user .RE .RS +4 .TP .ie t \(bu .el o the user must be a privileged user .RE .sp .LP If \fInew\fR exists, and the directory containing \fInew\fR is writable and has the sticky bit set, at least one of the following conditions must be true: .RS +4 .TP .ie t \(bu .el o the user must own \fInew\fR .RE .RS +4 .TP .ie t \(bu .el o the user must own the directory containing \fInew\fR .RE .RS +4 .TP .ie t \(bu .el o \fInew\fR must be writable by the user .RE .RS +4 .TP .ie t \(bu .el o the user must be a privileged user .RE .sp .LP If the link named by \fInew\fR exists, the file's link count becomes zero when it is removed, and no process has the file open, then the space occupied by the file will be freed and the file will no longer be accessible. If one or more processes have the file open when the last link is removed, the link will be removed before \fBrename()\fR or \fBrenameat()\fR returns, but the removal of the file contents will be postponed until all references to the file have been closed. .sp .LP Upon successful completion, the \fBrename()\fR and \fBrenameat()\fR functions will mark for update the \fBst_ctime\fR and \fBst_mtime\fR fields of the parent directory of each file. .SH RETURN VALUES Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is returned and \fBerrno\fR is set to indicate an error. .SH ERRORS The \fBrename()\fR and \fBrenameat()\fR functions will fail if: .sp .ne 2 .na \fB\fBEACCES\fR\fR .ad .RS 16n A component of either path prefix denies search permission; one of the directories containing \fIold\fR and \fInew\fR denies write permissions; or write permission is denied by a directory pointed to by \fIold\fR or \fInew\fR. .RE .sp .ne 2 .na \fB\fBEBUSY\fR\fR .ad .RS 16n The \fInew\fR argument is a directory and the mount point for a mounted file system. .RE .sp .ne 2 .na \fB\fBEDQUOT\fR\fR .ad .RS 16n The directory where the new name entry is being placed cannot be extended because the user's quota of disk blocks on that file system has been exhausted. .RE .sp .ne 2 .na \fB\fBEEXIST\fR\fR .ad .RS 16n The link named by \fInew\fR is a directory containing entries other than `\fB\&.\fR' (the directory itself) and `\fB\&..\fR' (the parent directory). .RE .sp .ne 2 .na \fB\fBEFAULT\fR\fR .ad .RS 16n Either \fIold\fR or \fInew\fR references an invalid address. .RE .sp .ne 2 .na \fB\fBEILSEQ\fR\fR .ad .RS 16n 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. .RE .sp .ne 2 .na \fB\fBEINVAL\fR\fR .ad .RS 16n The \fInew\fR argument directory pathname contains a path prefix that names the \fIold\fR directory, or an attempt was made to rename a regular file to an extended attribute or from an extended attribute to a regular file. .RE .sp .ne 2 .na \fB\fBEIO\fR\fR .ad .RS 16n An I/O error occurred while making or updating a directory entry. .RE .sp .ne 2 .na \fB\fBEISDIR\fR\fR .ad .RS 16n The \fInew\fR argument points to a directory but \fIold\fR points to a file that is not a directory. .RE .sp .ne 2 .na \fB\fBELOOP\fR\fR .ad .RS 16n Too many symbolic links were encountered in translating the pathname. .RE .sp .ne 2 .na \fB\fBENAMETOOLONG\fR\fR .ad .RS 16n The length of \fIold\fR or \fInew\fR exceeds \fBPATH_MAX\fR, or a pathname component is longer than \fBNAME_MAX\fR while \fB_POSIX_NO_TRUNC\fR is in effect. .RE .sp .ne 2 .na \fB\fBEMLINK\fR\fR .ad .RS 16n The file named by \fIold\fR is a directory, and the link count of the parent directory of \fInew\fR would exceed \fBLINK_MAX\fR. .RE .sp .ne 2 .na \fB\fBENOENT\fR\fR .ad .RS 16n The link named by \fIold\fR does not name an existing file, a component of the path prefix of \fInew\fR does not exist, or either \fIold\fR or \fInew\fR points to an empty string. .RE .sp .ne 2 .na \fB\fBENOSPC\fR\fR .ad .RS 16n The directory that would contain \fInew\fR cannot be extended. .RE .sp .ne 2 .na \fB\fBENOTDIR\fR\fR .ad .RS 16n A component of either path prefix is not a directory, or \fIold\fR names a directory and \fInew\fR names a file that is not a directory, or \fItofd\fR and \fIdirfd\fR in \fBrenameat()\fR do not reference a directory. .RE .sp .ne 2 .na \fB\fBEROFS\fR\fR .ad .RS 16n The requested operation requires writing in a directory on a read-only file system. .RE .sp .ne 2 .na \fB\fBEXDEV\fR\fR .ad .RS 16n The links named by \fIold\fR and \fInew\fR are on different file systems. .RE .sp .LP The \fBrenameat()\fR function will fail if: .sp .ne 2 .na \fB\fBENOTSUP\fR\fR .ad .RS 11n An attempt was made to rename a regular file as an attribute file or to rename an attribute file as a regular file. .RE .SH ATTRIBUTES See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level Async-Signal-Safe _ Standard For \fBrename()\fR, see \fBstandards\fR(5). .TE .SH SEE ALSO \fBchmod\fR(2), \fBlink\fR(2), \fBunlink\fR(2), \fBattributes\fR(5), \fBfsattr\fR(5), \fBstandards\fR(5) .SH NOTES The system can deadlock if there is a loop in the file system graph. Such a loop can occur if there is an entry in directory \fBa\fR, \fBa/name1\fR, that is a hard link to directory \fBb\fR, and an entry in directory \fBb\fR, \fBb/name2\fR, that is a hard link to directory \fBa\fR. When such a loop exists and two separate processes attempt to rename \fBa/name1\fR to \fBb/name2\fR and \fBb/name2\fR to \fBa/name1\fR, the system may deadlock attempting to lock both directories for modification. Use symbolic links instead of hard links for directories.