Adding setgroups function.

* configure: Test for setgroups. New HAVE_SETGROUPS
preprocessor symbol for config/config.h.

* sysif.c (setgroups_wrap): New static function.
(sysif_init): Register intrinsic setgroups function.

* txr.1: Documented setgroups. Rearranged sections
so getgroups and setgroups descriptions are consecutive.

1 files changed, 22 insertions, 0 deletions

diff --git a/configure b/configure
index 1518af29..e0759ab1 100755
--- a/configure
+++ b/configure
@@ -2193,6 +2193,28 @@ else
   printf "no\n"
 fi
 
+printf "Checking for setgroups ... "
+
+cat > conftest.c <<!
+#include <sys/types.h>
+#include <unistd.h>
+#include <grp.h>
+
+int main(int argc, char **argv)
+{
+  int res = setgroups(0, 0);
+  return 0;
+}
+!
+
+if conftest ; then
+  printf "yes\n"
+  printf "#define HAVE_SETGROUPS 1\n" >> $config_h
+  have_unistd=y
+else
+  printf "no\n"
+fi
+
 printf "Checking for old school getpwent, getpwuid and getpwnam ... "
 
 cat > conftest.c <<!