1 files changed, 38 insertions, 0 deletions
diff --git a/m4/check-decl.m4 b/m4/check-decl.m4
new file mode 100644
index 0000000..4405aa9
--- /dev/null
+++ b/m4/check-decl.m4
@@ -0,0 +1,38 @@
+#serial 27
+# Check declarations for this package.
+
+dnl Copyright (C) 1997-2022 Free Software Foundation, Inc.
+
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+
+dnl This is just a wrapper function to encapsulate this kludge.
+dnl Putting it in a separate file like this helps share it between
+dnl different packages.
+AC_DEFUN([gl_CHECK_DECLS],
+[
+  AC_CHECK_HEADERS_ONCE([grp.h pwd.h])
+  headers='
+#include <sys/types.h>
+
+#include <unistd.h>
+
+#if HAVE_GRP_H
+# include <grp.h>
+#endif
+
+#if HAVE_PWD_H
+# include <pwd.h>
+#endif
+'
+  AC_CHECK_DECLS([
+    getgrgid,
+    getpwuid,
+    ttyname], , , $headers)
+
+  AC_CHECK_DECLS_ONCE([geteuid])
+  AC_CHECK_DECLS_ONCE([getlogin])
+  AC_CHECK_DECLS_ONCE([getuid])
+])