1 files changed, 39 insertions, 0 deletions
diff --git a/src/sysdeps/tryegidingroups.c b/src/sysdeps/tryegidingroups.c
new file mode 100644
index 0000000..687740d
--- /dev/null
+++ b/src/sysdeps/tryegidingroups.c
@@ -0,0 +1,39 @@
+/* ISC license. */
+
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE
+#endif
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
+#ifndef _NETBSD_SOURCE
+#define _NETBSD_SOURCE
+#endif
+
+#ifndef __EXTENSIONS__
+#define __EXTENSIONS__
+#endif
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <grp.h>
+
+int main (void)
+{
+  gid_t gid = getegid() ;
+  gid_t list[NGROUPS_MAX] ;
+  int i = 0 ;
+  int r = getgroups(NGROUPS_MAX, list) ;
+  if (r < 0) return 111 ;
+  for (; i < r ; i++) if (list[i] == gid) return 0 ;
+  return 1 ;
+}