1 files changed, 153 insertions, 0 deletions
diff --git a/src/grep/gnulib-tests/test-sigsegv-catch-segv2.c b/src/grep/gnulib-tests/test-sigsegv-catch-segv2.c
new file mode 100644
index 0000000..b2a4804
--- /dev/null
+++ b/src/grep/gnulib-tests/test-sigsegv-catch-segv2.c
@@ -0,0 +1,153 @@
+/* Test that the handler can be exited multiple times.
+   Copyright (C) 2002-2021 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 2 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/>.  */
+
+/* Written by Bruno Haible.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "sigsegv.h"
+
+#include <stdint.h>
+#include <stdio.h>
+
+#if HAVE_SIGSEGV_RECOVERY
+
+# if defined _WIN32 && !defined __CYGWIN__
+  /* Windows doesn't have sigset_t.  */
+  typedef int sigset_t;
+#  define sigemptyset(set)
+#  define sigprocmask(how,set,oldset)
+# endif
+
+# include "mmap-anon-util.h"
+# include <stdlib.h> /* for abort, exit */
+# include <signal.h>
+# include <setjmp.h>
+
+# if SIGSEGV_FAULT_ADDRESS_ALIGNMENT > 1UL
+#  include <unistd.h>
+#  define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS (getpagesize () - 1)
+# else
+#  define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS 0
+# endif
+
+jmp_buf mainloop;
+sigset_t mainsigset;
+
+volatile int pass = 0;
+uintptr_t page;
+
+volatile int handler_called = 0;
+
+static void
+handler_continuation (void *arg1, void *arg2, void *arg3)
+{
+  longjmp (mainloop, pass);
+}
+
+int
+handler (void *fault_address, int serious)
+{
+  handler_called++;
+  if (handler_called > 10)
+    abort ();
+  if (fault_address
+      != (void *)((page + 0x678 + 8 * pass) & ~SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS))
+    abort ();
+  pass++;
+  printf ("Fault %d caught.\n", pass);
+  sigprocmask (SIG_SETMASK, &mainsigset, NULL);
+  return sigsegv_leave_handler (handler_continuation, NULL, NULL, NULL);
+}
+
+void
+crasher (uintptr_t p)
+{
+  *(volatile int *) (p + 0x678 + 8 * pass) = 42;
+}
+
+int
+main ()
+{
+  int prot_unwritable;
+  void *p;
+  sigset_t emptyset;
+
+  /* Preparations.  */
+# if !HAVE_MAP_ANONYMOUS
+  zero_fd = open ("/dev/zero", O_RDONLY, 0644);
+# endif
+
+# if defined __linux__ && defined __sparc__
+  /* On Linux 2.6.26/SPARC64, PROT_READ has the same effect as
+     PROT_READ | PROT_WRITE.  */
+  prot_unwritable = PROT_NONE;
+# else
+  prot_unwritable = PROT_READ;
+# endif
+
+  /* Setup some mmaped memory.  */
+  p = mmap_zeromap ((void *) 0x12340000, 0x4000);
+  if (p == (void *)(-1))
+    {
+      fprintf (stderr, "mmap_zeromap failed.\n");
+      exit (2);
+    }
+  page = (uintptr_t) p;
+
+  /* Make it read-only.  */
+  if (mprotect ((void *) page, 0x4000, prot_unwritable) < 0)
+    {
+      fprintf (stderr, "mprotect failed.\n");
+      exit (2);
+    }
+
+  /* Install the SIGSEGV handler.  */
+  if (sigsegv_install_handler (&handler) < 0)
+    exit (2);
+
+  /* Save the current signal mask.  */
+  sigemptyset (&emptyset);
+  sigprocmask (SIG_BLOCK, &emptyset, &mainsigset);
+
+  /* Provoke two SIGSEGVs in a row.  */
+  switch (setjmp (mainloop))
+    {
+    case 0: case 1:
+      printf ("Doing SIGSEGV pass %d.\n", pass + 1);
+      crasher (page);
+      printf ("no SIGSEGV?!\n"); exit (1);
+    case 2:
+      break;
+    default:
+      abort ();
+    }
+
+  /* Test passed!  */
+  printf ("Test passed.\n");
+  return 0;
+}
+
+#else
+
+int
+main ()
+{
+  return 77;
+}
+
+#endif