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-rw-r--r--source4/build/tests/getgroups.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/source4/build/tests/getgroups.c b/source4/build/tests/getgroups.c
new file mode 100644
index 0000000000..343fd5a184
--- /dev/null
+++ b/source4/build/tests/getgroups.c
@@ -0,0 +1,66 @@
+/* this tests whether getgroups actually returns lists of integers
+ rather than gid_t. The test only works if the user running
+ the test is in at least 1 group
+
+ The test is designed to check for those broken OSes that define
+ getgroups() as returning an array of gid_t but actually return a
+ array of ints! Ultrix is one culprit
+ */
+
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <grp.h>
+
+main()
+{
+ int i;
+ int *igroups;
+ char *cgroups;
+ int grp = 0;
+ int ngroups = getgroups(0,&grp);
+
+ if (sizeof(gid_t) == sizeof(int)) {
+ fprintf(stderr,"gid_t and int are the same size\n");
+ exit(1);
+ }
+
+ if (ngroups <= 0)
+ ngroups = 32;
+
+ igroups = (int *)malloc(sizeof(int)*ngroups);
+
+ for (i=0;i<ngroups;i++)
+ igroups[i] = 0x42424242;
+
+ ngroups = getgroups(ngroups,(gid_t *)igroups);
+
+ if (igroups[0] == 0x42424242)
+ ngroups = 0;
+
+ if (ngroups == 0) {
+ printf("WARNING: can't determine getgroups return type\n");
+ exit(1);
+ }
+
+ cgroups = (char *)igroups;
+
+ if (ngroups == 1 &&
+ cgroups[2] == 0x42 && cgroups[3] == 0x42) {
+ fprintf(stderr,"getgroups returns gid_t\n");
+ exit(1);
+ }
+
+ for (i=0;i<ngroups;i++) {
+ if (igroups[i] == 0x42424242) {
+ fprintf(stderr,"getgroups returns gid_t\n");
+ exit(1);
+ }
+ }
+
+ exit(0);
+}