MAC_SET(3)             FreeBSD Library Functions Manual             MAC_SET(3)

NAME
     mac_set_file, mac_set_fd, mac_set_proc - set the MAC label for a file or
     process

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/mac.h>

     int
     mac_set_file(const char *path, mac_t label);

     int
     mac_set_link(const char *path, mac_t label);

     int
     mac_set_fd(int fd, mac_t label);

     int
     mac_set_proc(mac_t label);

DESCRIPTION
     The mac_set_file() and mac_set_fd() functions associate a MAC label
     specified 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.

RETURN VALUES
     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.

ERRORS
     [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
                        operations.

     [EOPNOTSUPP]       Setting MAC labels is not supported by the file
                        referenced by fd.

     [EPERM]            The calling process had insufficient privilege to
                        change the MAC label.

     [EROFS]            File system for the object being modified is read
                        only.

     [ENAMETOOLONG]     The length of the pathname in path_p exceeds PATH_MAX,
                        or a component of the pathname is longer than
                        NAME_MAX.

     [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 ALSO
     mac(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.

FreeBSD 13.1-RELEASE-p6        January 14, 2003        FreeBSD 13.1-RELEASE-p6