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-rw-r--r--libguile/posix.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/libguile/posix.c b/libguile/posix.c
index b9097d41a..383ab76fd 100644
--- a/libguile/posix.c
+++ b/libguile/posix.c
@@ -265,8 +265,10 @@ SCM_DEFINE (scm_getgroups, "getgroups", 0, 0, 0,
GETGROUPS_T *groups;
ngroups = getgroups (0, NULL);
- if (ngroups <= 0)
+ if (ngroups < 0)
SCM_SYSERROR;
+ else if (ngroups == 0)
+ return scm_c_make_vector (0, SCM_BOOL_F);
size = ngroups * sizeof (GETGROUPS_T);
groups = scm_malloc (size);