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Fix `getgroups' for when zero supplementary group IDs exist.

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* libguile/posix.c (scm_getgroups): Return the empty vector when NGROUPS
  is zero.  Reported by Mike Gran <spk121@yahoo.com>.
This commit is contained in:
Ludovic Courtès 2013-02-16 18:40:39 +01:00
parent 91c763ee3f
commit 3d2b2676e3
1 changed files with 3 additions and 1 deletions
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4
libguile/posix.c
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@ -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);