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FreeBSD 11.0 - man page for mac_set_link (freebsd section 3)

MAC_SET(3)						   BSD Library Functions Manual 						MAC_SET(3)

mac_set_file, mac_set_fd, mac_set_proc -- set the MAC label for a file or process
Standard C Library (libc, -lc)
#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);
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.
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 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.
mac(3), mac_free(3), mac_get(3), mac_is_present(3), mac_prepare(3), mac_text(3), posix1e(3), mac(4), mac(9)
Support for Mandatory Access Control was introduced in FreeBSD 5.0 as part of the TrustedBSD Project.
January 14, 2003 BSD

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