rmdir(3posix)
NAME
rmdir --- remove a directory
SYNOPSIS
#include <unistd.h> int rmdir(const char *path);
DESCRIPTION
The rmdir() function shall remove a directory whose name is given by path. The directory shall be removed only if it is an empty directory. If the directory is the root directory or the current working directory of any process, it is unspecified whether the function succeeds, or whether it shall fail and set errno to [EBUSY]. If path names a symbolic link, then rmdir() shall fail and set errno to [ENOTDIR]. If the path argument refers to a path whose final component is either dot or dot-dot, rmdir() shall fail. If the directory's link count becomes 0 and no process has the directory open, the space occupied by the directory shall be freed and the directory shall no longer be accessible. If one or more processes have the directory open when the last link is removed, the dot and dot- dot entries, if present, shall be removed before rmdir() returns and no new entries may be created in the directory, but the directory shall not be removed until all references to the directory are closed. If the directory is not an empty directory, rmdir() shall fail and set errno to [EEXIST] or [ENOTEMPTY]. Upon successful completion, rmdir() shall mark for update the last data modification and last file status change timestamps of the parent directory.
RETURN VALUE
Upon successful completion, the function rmdir() shall return 0. Otherwise, 1 shall be returned, and errno set to indicate the error. If 1 is returned, the named directory shall not be changed.
ERRORS
The rmdir() function shall fail if:
EACCES Search permission is denied on a component of the path prefix,
or write permission is denied on the parent directory of the
directory to be removed.
EBUSY The directory to be removed is currently in use by the system or
some process and the implementation considers this to be an
error.
[EEXIST] or [ENOTEMPTY]
The path argument names a directory that is not an empty
directory, or there are hard links to the directory other
than dot or a single entry in dot-dot.
EINVAL The path argument contains a last component that is dot.
EIO A physical I/O error has occurred.
ELOOP A loop exists in symbolic links encountered during
resolution of the path argument.
ENAMETOOLONG
The length of a component of a pathname is longer than
{NAME_MAX}.
ENOENT A component of path does not name an existing file, or the
path argument names a nonexistent directory or points to an
empty string.
ENOTDIR A component of path names an existing file that is neither
a directory nor a symbolic link to a directory.
[EPERM] or [EACCES]
The S_ISVTX flag is set on the directory containing the
file referred to by the path argument and the process does
not satisfy the criteria specified in the Base Definitions
volume of POSIX.12008, Section 4.2, Directory Protection.
EROFS The directory entry to be removed resides on a read-only
file system.
The rmdir() function may fail if:
ELOOP More than {SYMLOOP_MAX} symbolic links were encountered during
resolution of the path argument.
ENAMETOOLONG
The length of a pathname exceeds {PATH_MAX}, or pathname
resolution of a symbolic link produced an intermediate result
with a length that exceeds {PATH_MAX}.
The following sections are informative.
EXAMPLES
Removing a Directory
The following example shows how to remove a directory named
/home/cnd/mod1.
#include <unistd.h>
int status;
...
status = rmdir("/home/cnd/mod1");
APPLICATION USAGE
None.
RATIONALE
The rmdir() and rename() functions originated in 4.2 BSD, and they used
[ENOTEMPTY] for the condition when the directory to be removed does not
exist or new already exists. When the 1984 /usr/group standard was
published, it contained [EEXIST] instead. When these functions were
adopted into System V, the 1984 /usr/group standard was used as a
reference. Therefore, several existing applications and implementations
support/use both forms, and no agreement could be reached on either
value. All implementations are required to supply both [EEXIST] and
[ENOTEMPTY] in <errno.h> with distinct values, so that applications can
use both values in C-language case statements.
The meaning of deleting pathname/dot is unclear, because the name of
the file (directory) in the parent directory to be removed is not
clear, particularly in the presence of multiple links to a directory.
The POSIX.11990 standard was silent with regard to the behavior of
rmdir() when there are multiple hard links to the directory being
removed. The requirement to set errno to [EEXIST] or [ENOTEMPTY]
clarifies the behavior in this case.
If the current working directory of the process is being removed, that
should be an allowed error.
Virtually all existing implementations detect [ENOTEMPTY] or the case
of dot-dot. The text in Section 2.3, Error Numbers about returning any
one of the possible errors permits that behavior to continue. The
[ELOOP] error may be returned if more than {SYMLOOP_MAX} symbolic links
are encountered during resolution of the path argument.
FUTURE DIRECTIONS
None.
SEE ALSO
Section 2.3, Error Numbers, mkdir(), remove(), rename(), unlink() The Base Definitions volume of POSIX.12008, Section 4.2, Directory Protection, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html . Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
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