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-rw-r--r--src/grep/gnulib-tests/test-c-stack.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/grep/gnulib-tests/test-c-stack.c b/src/grep/gnulib-tests/test-c-stack.c
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+++ b/src/grep/gnulib-tests/test-c-stack.c
@@ -0,0 +1,73 @@
+/* Test of c-stack module.
+ Copyright (C) 2002, 2004, 2006, 2008-2021 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include "c-stack.h"
+
+#include "exitfail.h"
+#include <stdio.h>
+#if HAVE_SETRLIMIT
+/* At least FreeBSD 5.0 needs extra headers before <sys/resource.h>
+ will compile. */
+# include <sys/types.h>
+# include <sys/time.h>
+# include <sys/resource.h>
+#endif
+
+#include "macros.h"
+
+static volatile int *
+recurse_1 (volatile int n, volatile int *p)
+{
+ if (n >= 0)
+ *recurse_1 (n + 1, p) += n;
+ return p;
+}
+
+static int
+recurse (volatile int n)
+{
+ int sum = 0;
+ return *recurse_1 (n, &sum);
+}
+
+int
+main (int argc, char **argv)
+{
+#if HAVE_SETRLIMIT && defined RLIMIT_STACK
+ /* Before starting the endless recursion, try to be friendly to the
+ user's machine. On some Linux 2.2.x systems, there is no stack
+ limit for user processes at all. We don't want to kill such
+ systems. */
+ struct rlimit rl;
+ rl.rlim_cur = rl.rlim_max = 0x100000; /* 1 MB */
+ setrlimit (RLIMIT_STACK, &rl);
+#endif
+
+ if (c_stack_action (NULL) == 0)
+ {
+ if (1 < argc)
+ {
+ exit_failure = 77;
+ ++*argv[argc]; /* Intentionally dereference NULL. */
+ }
+ return recurse (0);
+ }
+ fputs ("skipping test: ", stderr);
+ perror ("c_stack_action");
+ return 77;
+}