MAC_SET(3) BSD Library Functions Manual MAC_SET(3)NAME
mac_set_file, mac_set_fd, mac_set_proc — set the MAC label for a file or
Standard C Library (libc, -lc)
mac_set_file(const char *path, mac_t label);
mac_set_link(const char *path, mac_t label);
mac_set_fd(int fd, mac_t label);
The mac_set_file() and mac_set_fd() functions associate a MAC label spec‐
ified by label to the file referenced to by path_p, or to the file
descriptor fd, respectively. Note that when a file descriptor references
a socket, label operations on the file descriptor act on the socket, not
on the file that may have been used as a rendezvous when binding the
socket. The mac_set_link() function is the same as mac_set_file(),
except that it does not follow symlinks.
The mac_set_proc() function associates the MAC label specified by label
to the calling process.
A process is allowed to set a label for a file only if it has MAC write
access to the file, and its effective user ID is equal to the owner of
the file, or has appropriate privileges.
The mac_set_fd(), mac_set_file(), mac_set_link(), and mac_set_proc()
functions return the value 0 if successful; otherwise the value -1 is
returned and the global variable errno is set to indicate the error.
[EACCES] MAC write access to the file is denied.
[EBADF] The fd argument is not a valid file descriptor.
[EINVAL] The label argument is not a valid MAC label, or the
object referenced by fd is not appropriate for label
[EOPNOTSUPP] Setting MAC labels is not supported by the file refer‐
enced by fd.
[EPERM] The calling process had insufficient privilege to
change the MAC label.
[EROFS] File system for the object being modified is read
[ENAMETOOLONG] The length of the pathname in path_p exceeds PATH_MAX,
or a component of the pathname is longer than
[ENOENT] The file referenced by path_p does not exist.
[ENOTDIR] A component of the pathname referenced by path_p is
not a directory.
SEE ALSOmac(3), mac_free(3), mac_get(3), mac_is_present(3), mac_prepare(3),
mac_text(3), posix1e(3), mac(4), mac(9)HISTORY
Support for Mandatory Access Control was introduced in FreeBSD 5.0 as
part of the TrustedBSD Project.
BSD January 14, 2003 BSD