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diff --git a/lib/getugroups.c b/lib/getugroups.c
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index 299bae6..8ece29b 100644
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--- a/lib/getugroups.c
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+++ b/lib/getugroups.c
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@@ -19,6 +19,9 @@
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#include <config.h>
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+/* We do not need this code if getgrouplist(3) is available. */
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+#ifndef HAVE_GETGROUPLIST
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+
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#include "getugroups.h"
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#include <errno.h>
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@@ -126,3 +129,4 @@ getugroups (int maxcount, gid_t *grouplist, char const *username,
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}
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#endif /* HAVE_GRP_H */
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+#endif /* have getgrouplist */
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diff --git a/lib/mgetgroups.c b/lib/mgetgroups.c
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index 76474c2..0a9d221 100644
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--- a/lib/mgetgroups.c
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+++ b/lib/mgetgroups.c
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@@ -31,6 +31,7 @@
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#endif
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#include "getugroups.h"
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+#include "xalloc.h"
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#include "xalloc-oversized.h"
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/* Work around an incompatibility of OS X 10.11: getgrouplist
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@@ -121,9 +122,17 @@ mgetgroups (char const *username, gid_t gid, gid_t **groups)
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/* else no username, so fall through and use getgroups. */
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#endif
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- max_n_groups = (username
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- ? getugroups (0, NULL, username, gid)
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- : getgroups (0, NULL));
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+ if (!username)
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+ max_n_groups = getgroups(0, NULL);
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+ else
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+ {
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+#ifdef HAVE_GETGROUPLIST
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+ max_n_groups = 0;
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+ getgrouplist (username, gid, NULL, &max_n_groups);
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+#else
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+ max_n_groups = getugroups (0, NULL, username, gid);
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+#endif
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+ }
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/* If we failed to count groups because there is no supplemental
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group support, then return an array containing just GID.
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@@ -145,10 +154,25 @@ mgetgroups (char const *username, gid_t gid, gid_t **groups)
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if (g == NULL)
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return -1;
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- ng = (username
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- ? getugroups (max_n_groups, g, username, gid)
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- : getgroups (max_n_groups - (gid != (gid_t) -1),
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- g + (gid != (gid_t) -1)));
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+ if (!username)
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+ ng = getgroups (max_n_groups - (gid != (gid_t)-1), g + (gid != (gid_t)-1));
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+ else
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+ {
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+#ifdef HAVE_GETGROUPLIST
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+ int e;
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+ ng = max_n_groups;
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+ while ((e = getgrouplist (username, gid, g, &ng)) == -1
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+ && ng > max_n_groups)
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+ {
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+ max_n_groups = ng;
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+ g = xrealloc (g, max_n_groups * sizeof (GETGROUPS_T));
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+ }
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+ if (e == -1)
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+ ng = -1;
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+#else
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+ ng = getugroups (max_n_groups, g, username, gid);
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+#endif
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+ }
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if (ng < 0)
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{
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diff --git a/m4/jm-macros.m4 b/m4/jm-macros.m4
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index 62777c7..5180243 100644
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--- a/m4/jm-macros.m4
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+++ b/m4/jm-macros.m4
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@@ -82,6 +82,7 @@ AC_DEFUN([coreutils_MACROS],
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fchown
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fchmod
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ftruncate
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+ getgrouplist
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iswspace
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mkfifo
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mbrlen
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