Command Section
MAC_GET(3)             FreeBSD Library Functions Manual             MAC_GET(3)

     mac_get_file, mac_get_link, mac_get_fd, mac_get_peer, mac_get_pid,
     mac_get_proc - get the label of a file, socket, socket peer or process

     Standard C Library (libc, -lc)

     #include <sys/mac.h>

     mac_get_file(const char *path, mac_t label);

     mac_get_link(const char *path, mac_t label);

     mac_get_fd(int fd, mac_t label);

     mac_get_peer(int fd, mac_t label);

     mac_get_pid(pid_t pid, mac_t label);

     mac_get_proc(mac_t label);

     The mac_get_file() system call returns the label associated with a file
     specified by pathname.  The mac_get_link() function is the same as
     mac_get_file(), except that it does not follow symlinks.

     The mac_get_fd() system call returns the label associated with an object
     referenced by the specified file descriptor.  Note that in the case of a
     file system socket, the label returned will be the socket label, which
     may be different from the label of the on-disk node acting as a
     rendezvous for the socket.  The mac_get_peer() system call returns the
     label associated with the remote endpoint of a socket; the exact
     semantics of this call will depend on the protocol domain, communications
     type, and endpoint; typically this label will be cached when a
     connection-oriented protocol instance is first set up, and is undefined
     for datagram protocols.

     The mac_get_pid() and mac_get_proc() system calls return the process
     label associated with an arbitrary process ID, or the current process.

     Label storage for use with these calls must first be allocated and
     prepared using the mac_prepare(3) functions.  When an application is done
     using a label, the memory may be returned using mac_free(3).

     [EACCES]           A component of path is not searchable, or MAC read
                        access to the file is denied.

     [EINVAL]           The requested label operation is not valid for the
                        object referenced by fd.

     [ENAMETOOLONG]     The pathname pointed to by path exceeds PATH_MAX, or a
                        component of the pathname exceeds NAME_MAX.

     [ENOENT]           A component of path does not exist.

     [ENOMEM]           Insufficient memory is available to allocate a new MAC
                        label structure.

     [ENOTDIR]          A component of path is not a directory.

     mac(3), mac_free(3), mac_prepare(3), mac_set(3), mac_text(3), posix1e(3),
     mac(4), mac(9)

     POSIX.1e is described in IEEE POSIX.1e draft 17.  Discussion of the draft
     continues on the cross-platform POSIX.1e implementation mailing list.  To
     join this list, see the FreeBSD POSIX.1e implementation page for more

     Support for Mandatory Access Control was introduced in FreeBSD 5.0 as
     part of the TrustedBSD Project.

FreeBSD 11.1-RELEASE-p4        December 21, 2001       FreeBSD 11.1-RELEASE-p4
Command Section