Originální popis anglicky:
rmdir - remove a directory
Návod, kniha: POSIX Programmer's Manual
#include <unistd.h>
int rmdir(const char *
path);
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, the
rmdir() function shall mark for update
the
st_ctime and
st_mtime fields of the parent directory.
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.
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 the path argument exceeds {PATH_MAX}
or a pathname component 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 is not a directory.
- EPERM or EACCES
-
The S_ISVTX flag is set on the parent directory of the directory to be
removed and the caller is not the owner of the directory to be removed,
nor is the caller the owner of the parent directory, nor does the caller
have the appropriate privileges.
- 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
- As a result of encountering a symbolic link in resolution
of the path argument, the length of the substituted pathname string
exceeded {PATH_MAX}.
The following sections are informative.
The following example shows how to remove a directory named
/home/cnd/mod1.
#include <unistd.h>
int status;
...
status = rmdir("/home/cnd/mod1");
None.
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.1-1990 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 process' current working directory is being removed, that should be an
allowed error.
Virtually all existing implementations detect [ENOTEMPTY] or the case of
dot-dot. The text in
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.
None.
Error Numbers ,
mkdir() ,
remove() ,
unlink() , the
Base Definitions volume of IEEE Std 1003.1-2001,
<unistd.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html
.
