34{
35#if defined(SO_PEERCRED)
36
37 struct ucred peercred;
39
40 if (getsockopt(sock, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) != 0 ||
41 so_len != sizeof(peercred))
42 return -1;
43 *uid = peercred.uid;
44 *gid = peercred.gid;
45 return 0;
46#elif defined(LOCAL_PEERCRED)
47
48 struct xucred peercred;
50
51 if (getsockopt(sock, 0, LOCAL_PEERCRED, &peercred, &so_len) != 0 ||
52 so_len != sizeof(peercred) ||
53 peercred.cr_version != XUCRED_VERSION)
54 return -1;
55 *uid = peercred.cr_uid;
56 *gid = peercred.cr_gid;
57 return 0;
58#elif defined(HAVE_GETPEERUCRED)
59
60 ucred_t *ucred;
61
62 ucred = NULL;
63 if (getpeerucred(sock, &ucred) == -1)
64 return -1;
65
66 *uid = ucred_geteuid(ucred);
67 *gid = ucred_getegid(ucred);
68 ucred_free(ucred);
69
70 if (*uid == (
uid_t) (-1) || *gid == (
gid_t) (-1))
71 return -1;
72 return 0;
73#else
74
75 errno = ENOSYS;
76 return -1;
77#endif
78}