3 files changed, 23 insertions, 1 deletions
diff --git a/coreutils/id.c b/coreutils/id.c
index a4f178bda..0e1286294 100644
--- a/coreutils/id.c
+++ b/coreutils/id.c
@@ -112,6 +112,7 @@ static int print_user(uid_t id, const char *prefix)
        return print_common(id, uid2uname(id), prefix);
 }
+#if !ENABLE_PLATFORM_MINGW32
 /* On error set *n < 0 and return >= 0
 * If *n is too small, update it and return < 0
 * (ok to trash groups[] in both cases)
@@ -142,6 +143,7 @@ static int get_groups(const char *username, gid_t rgid, gid_t *groups, int *n)
        /* if *n >= 0, return -1 (got new *n), else return 0 (error): */
        return -(*n >= 0);
 }
+#endif
 int id_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int id_main(int argc UNUSED_PARAM, char **argv)
@@ -184,16 +186,26 @@ int id_main(int argc UNUSED_PARAM, char **argv)
                euid = ruid = p->pw_uid;
                egid = rgid = p->pw_gid;
        } else {
+#if ENABLE_PLATFORM_MINGW32
+                // We don't distinguish real/effective ids on Windows.
+                euid = ruid = getuid();
+                egid = rgid = getegid();
+#else
                egid = getegid();
                rgid = getgid();
                euid = geteuid();
                ruid = getuid();
+#endif
        }
        /* JUST_ALL_GROUPS ignores -r PRINT_REAL flag even if man page for */
        /* id says: print the real ID instead of the effective ID, with -ugG */
        /* in fact in this case egid is always printed if egid != rgid */
        if (!opt || (opt & JUST_ALL_GROUPS)) {
+#if ENABLE_PLATFORM_MINGW32
+                gid_t groups[1];
+#else
                gid_t *groups;
+#endif
                int n;
                if (!opt) {
@@ -210,6 +222,11 @@ int id_main(int argc UNUSED_PARAM, char **argv)
                        if (egid != rgid)
                                status |= print_group(egid, " ");
                }
+#if ENABLE_PLATFORM_MINGW32
+                // We only admit to having one group id on Windows.
+                n = 1;
+                groups[0] = rgid;
+#else
                /* We are supplying largish buffer, trying
                 * to not run get_groups() twice. That might be slow
                 * ("user database in remote SQL server" case) */
@@ -220,6 +237,7 @@ int id_main(int argc UNUSED_PARAM, char **argv)
                        groups = xrealloc(groups, n * sizeof(groups[0]));
                        get_groups(username, rgid, groups, &n);
                }
+#endif
                if (n > 0) {
                        /* Print the list */
                        prefix = " groups=";
@@ -234,7 +252,7 @@ int id_main(int argc UNUSED_PARAM, char **argv)
                                bb_simple_error_msg_and_die("can't get groups");
                        return EXIT_FAILURE;
                }
-                if (ENABLE_FEATURE_CLEAN_UP)
+                if (ENABLE_FEATURE_CLEAN_UP && !ENABLE_PLATFORM_MINGW32)
                        free(groups);
 #if ENABLE_SELINUX
                if (is_selinux_enabled()) {
diff --git a/libbb/bb_getgroups.c b/libbb/bb_getgroups.c
index c255d4e4c..757b80be8 100644
--- a/libbb/bb_getgroups.c
+++ b/libbb/bb_getgroups.c
@@ -10,6 +10,7 @@
 #include "libbb.h"
+#if !ENABLE_PLATFORM_MINGW32
 gid_t* FAST_FUNC bb_getgroups(int *ngroups, gid_t *group_array)
 {
        int n = ngroups ? *ngroups : 0;
@@ -45,6 +46,7 @@ gid_t* FAST_FUNC bb_getgroups(int *ngroups, gid_t *group_array)
                *ngroups = n;
        return group_array;
 }
+#endif
 uid_t FAST_FUNC get_cached_euid(uid_t *euid)
 {
diff --git a/win32/mingw.c b/win32/mingw.c
index c14ad1f1f..d323014b7 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -1273,6 +1273,7 @@ struct group *getgrgid(gid_t gid)
        return &g;
 }
+#if 0
 int getgrouplist(const char *user UNUSED_PARAM, gid_t group,
                                        gid_t *groups, int *ngroups)
 {
@@ -1295,6 +1296,7 @@ int getgroups(int n, gid_t *groups)
        groups[0] = getgid();
        return 1;
 }
+#endif
 int getlogin_r(char *buf, size_t len)
 {