attr_remove, attr_removef - remove a user attribute of a
filesystem object
#include <attr/attributes.h>
int attr_remove (const char *path, const char *attrname, int flags);
int attr_removef (int fd, const char *attrname, int flags);
The attr_remove and attr_removef functions provide a
way to remove previously created attributes from filesystem objects.
Path points to a path name for a filesystem object, and
fd refers to the file descriptor associated with a file. If the
attribute attrname exists, the attribute name and value will be
removed from the filesystem object. The flags argument can contain
the following symbols bitwise OR'ed together:
- ATTR_ROOT
- Look for attrname in the root address space, not in the
user address space. (limited to use by super-user only)
- ATTR_DONTFOLLOW
- Do not follow symbolic links when resolving a path on an
attr_remove function call. The default is to follow symbolic
links.
attr_remove will fail if one or more of the following are
true:
- [ENOATTR]
- The attribute name given is not associated with the indicated filesystem
object.
- [ENOENT]
- The named file does not exist.
- [EPERM]
- The effective user ID does not match the owner of the file
and the effective user ID is not super-user.
- [ENOTDIR]
- A component of the path prefix is not a directory.
- [EACCES]
- Search permission is denied on a component of the path prefix.
- [EINVAL]
- A bit was set in the flag argument that is not defined for this
system call.
- [EFAULT]
- Path points outside the allocated address space of the
process.
- [ELOOP]
- A path name lookup involved too many symbolic links.
- [ENAMETOOLONG]
- The length of path exceeds {MAXPATHLEN}, or a pathname
component is longer than {MAXNAMELEN}.
attr_removef will fail if:
- [ENOATTR]
- The attribute name given is not associated with the indicated filesystem
object.
- [EINVAL]
- A bit was set in the flag argument that is not defined for this
system call, or fd refers to a socket, not a file.
- [EFAULT]
- Attrname points outside the allocated address space of the
process.
- [EBADF]
- Fd does not refer to a valid descriptor.
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.