gdb/record: Add testcases for a few syscalls.

gdb/testsuite/ChangeLog:

	* gdb.reverse/fstatat-reverse.c: New test.
	* gdb.reverse/fstatat-reverse.exp: New file.
	* gdb.reverse/getresuid-reverse.c: New test.
	* gdb.reverse/getresuid-reverse.exp: New file.
	* gdb.reverse/pipe-reverse.c: New test.
	* gdb.reverse/pipe-reverse.exp: New file.
	* gdb.reverse/readv-reverse.c: New test.
	* gdb.reverse/readv-reverse.exp: New file.
	* gdb.reverse/recvmsg-reverse.c: New test.
	* gdb.reverse/recvmsg-reverse.exp: New file.
	* gdb.reverse/time-reverse.c: New test.
	* gdb.reverse/time-reverse.exp: New file.
	* gdb.reverse/waitpid-reverse.c: New test.
	* gdb.reverse/waitpid-reverse.exp: New file.

gdb/testsuite/ChangeLog

@@ -1,3 +1,20 @@
+2015-10-30  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* gdb.reverse/fstatat-reverse.c: New test.
+	* gdb.reverse/fstatat-reverse.exp: New file.
+	* gdb.reverse/getresuid-reverse.c: New test.
+	* gdb.reverse/getresuid-reverse.exp: New file.
+	* gdb.reverse/pipe-reverse.c: New test.
+	* gdb.reverse/pipe-reverse.exp: New file.
+	* gdb.reverse/readv-reverse.c: New test.
+	* gdb.reverse/readv-reverse.exp: New file.
+	* gdb.reverse/recvmsg-reverse.c: New test.
+	* gdb.reverse/recvmsg-reverse.exp: New file.
+	* gdb.reverse/time-reverse.c: New test.
+	* gdb.reverse/time-reverse.exp: New file.
+	* gdb.reverse/waitpid-reverse.c: New test.
+	* gdb.reverse/waitpid-reverse.exp: New file.
+
 2015-10-27  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* gdb.ada/access_to_packed_array.exp: Fix typos erroring the testfile.

gdb/testsuite/gdb.reverse/fstatat-reverse.c

@@ -0,0 +1,43 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008-2015 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 <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+void
+marker1 (void)
+{
+}
+
+void
+marker2 (void)
+{
+}
+
+struct stat buf;
+
+int
+main (void)
+{
+  marker1 ();
+  int fd = open ("/", O_PATH);
+  fstatat( fd, ".", &buf, 0);
+  marker2 ();
+  return 0;
+}

gdb/testsuite/gdb.reverse/fstatat-reverse.exp

@@ -0,0 +1,55 @@
+# Copyright 2015 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 <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+#
+# This test tests fstatat syscall for reverse execution.
+#
+
+if ![supports_reverse] {
+    return
+}
+
+standard_testfile
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
+    return -1
+}
+
+runto main
+
+if [supports_process_record] {
+    # Activate process record/replay
+    gdb_test_no_output "record" "Turn on process record"
+}
+
+gdb_test "break marker1" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker1"
+
+gdb_test "break marker2" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker2"
+
+gdb_continue_to_breakpoint "marker2" ".*$srcfile:.*"
+
+gdb_test "reverse-continue" ".*$srcfile:$decimal.*" "reverse to marker1"
+
+# If the variable was recorded properly on syscall, the old contents (0)
+# will be remembered.  If not, new contents (mode of /) will be used,
+# and the test will fail.
+
+gdb_test "print buf.st_mode" ".* = 0" "check fstatat record"

gdb/testsuite/gdb.reverse/getresuid-reverse.c

@@ -0,0 +1,42 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008-2015 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 <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <unistd.h>
+
+void
+marker1 (void)
+{
+}
+
+void
+marker2 (void)
+{
+}
+
+uid_t ruid = -1, euid = -1, suid = -1;
+gid_t rgid = -1, egid = -1, sgid = -1;
+
+int
+main (void)
+{
+  marker1 ();
+  getresuid (&ruid, &euid, &suid);
+  getresgid (&rgid, &egid, &sgid);
+  marker2 ();
+  return 0;
+}

gdb/testsuite/gdb.reverse/getresuid-reverse.exp

@@ -0,0 +1,62 @@
+# Copyright 2015 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 <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+#
+# This test tests getresuid/getresgid syscalls for reverse execution.
+#
+
+if ![supports_reverse] {
+    return
+}
+
+standard_testfile
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
+    return -1
+}
+
+runto main
+
+if [supports_process_record] {
+    # Activate process record/replay
+    gdb_test_no_output "record" "Turn on process record"
+}
+
+gdb_test "break marker1" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker1"
+
+gdb_test "break marker2" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker2"
+
+gdb_continue_to_breakpoint "marker2" ".*$srcfile:.*"
+
+gdb_test "reverse-continue" ".*$srcfile:$decimal.*" "reverse to marker1"
+
+# If the variables were recorded properly on syscall, the old contents (-1)
+# will be remembered.  If not, new contents (the actual uid/gid) will be used,
+# and the test will fail (we hope the test user doesn't actually have uid of
+# -1).  Do it this way instead of printing uid/gid directly, since uid_t/gid_t
+# is likely to be unsigned.
+
+gdb_test "print ruid == (uid_t)-1" ".* = 1" "check ruid record"
+gdb_test "print euid == (uid_t)-1" ".* = 1" "check euid record"
+gdb_test "print suid == (uid_t)-1" ".* = 1" "check suid record"
+gdb_test "print rgid == (gid_t)-1" ".* = 1" "check rgid record"
+gdb_test "print egid == (gid_t)-1" ".* = 1" "check egid record"
+gdb_test "print sgid == (gid_t)-1" ".* = 1" "check sgid record"

gdb/testsuite/gdb.reverse/pipe-reverse.c

@@ -0,0 +1,40 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008-2015 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 <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <unistd.h>
+
+void
+marker1 (void)
+{
+}
+
+void
+marker2 (void)
+{
+}
+
+int fds[2] = { -1, -1 };
+
+int
+main (void)
+{
+  marker1 ();
+  pipe (fds);
+  marker2 ();
+  return 0;
+}

gdb/testsuite/gdb.reverse/pipe-reverse.exp

@@ -0,0 +1,55 @@
+# Copyright 2015 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 <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+#
+# This test tests pipe syscall for reverse execution.
+#
+
+if ![supports_reverse] {
+    return
+}
+
+standard_testfile
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
+    return -1
+}
+
+runto main
+
+if [supports_process_record] {
+    # Activate process record/replay
+    gdb_test_no_output "record" "Turn on process record"
+}
+
+gdb_test "break marker1" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker1"
+
+gdb_test "break marker2" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker2"
+
+gdb_continue_to_breakpoint "marker2" ".*$srcfile:.*"
+
+gdb_test "reverse-continue" ".*$srcfile:$decimal.*" "reverse to marker1"
+
+# If the variables were recorded properly on syscall, the old contents (-1)
+# will be remembered.  If not, new contents (the file fds from pipe) will be
+# used, and the test will fail.
+
+gdb_test "print fds" ".* = {-1, -1}" "check pipe record"

gdb/testsuite/gdb.reverse/readv-reverse.c

@@ -0,0 +1,50 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008-2015 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 <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/uio.h>
+
+void
+marker1 (void)
+{
+}
+
+void
+marker2 (void)
+{
+}
+
+int fds[2] = { -1, -1 };
+char buf[5];
+const struct iovec v[4] = {
+  { &buf[1], 1 },
+  { &buf[0], 1 },
+  { &buf[3], 1 },
+  { &buf[2], 1 },
+};
+
+int
+main (void)
+{
+  marker1 ();
+  pipe (fds);
+  write (fds[1], "UNIX", 4);
+  readv (fds[0], v, 4);
+  marker2 ();
+  return 0;
+}

gdb/testsuite/gdb.reverse/readv-reverse.exp

@@ -0,0 +1,58 @@
+# Copyright 2015 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 <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+#
+# This test tests pipe syscall for reverse execution.
+#
+
+if ![supports_reverse] {
+    return
+}
+
+standard_testfile
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
+    return -1
+}
+
+runto main
+
+if [supports_process_record] {
+    # Activate process record/replay
+    gdb_test_no_output "record" "Turn on process record"
+}
+
+gdb_test "break marker1" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker1"
+
+gdb_test "break marker2" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker2"
+
+gdb_continue_to_breakpoint "marker2" ".*$srcfile:.*"
+
+gdb_test "reverse-continue" ".*$srcfile:$decimal.*" "reverse to marker1"
+
+# If the variables were recorded properly on syscall, the old contents ("")
+# will be remembered.  If not, new contents ("NUXI") will be
+# used, and the test will fail.
+
+gdb_test "print (int)buf\[0]" ".* = 0" "check readv record"
+gdb_test "print (int)buf\[1]" ".* = 0" "check readv record"
+gdb_test "print (int)buf\[2]" ".* = 0" "check readv record"
+gdb_test "print (int)buf\[3]" ".* = 0" "check readv record"

gdb/testsuite/gdb.reverse/recvmsg-reverse.c

@@ -0,0 +1,94 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008-2015 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 <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+void
+marker1 (void)
+{
+}
+
+void
+marker2 (void)
+{
+}
+
+char wdata[] = "abcdef";
+
+struct iovec wv[1] = {
+  { wdata, 6 },
+};
+
+char wc[CMSG_SPACE (sizeof (struct ucred)) + CMSG_SPACE (sizeof (int))];
+
+struct msghdr wmsg = {
+  0, 0,
+  wv, 1,
+  wc, sizeof wc,
+  0,
+};
+
+char rdata[5] = "xxxx";
+
+struct iovec rv[2] = {
+  {&rdata[2], 2},
+  {&rdata[0], 2},
+};
+
+char rc[CMSG_SPACE (sizeof (struct ucred)) + 7];
+
+struct msghdr rmsg = {
+  0, 0,
+  rv, 2,
+  rc, sizeof rc,
+  0,
+};
+
+int fds[2];
+
+int
+main (void)
+{
+  int itrue = 1;
+  /* prepare cmsg to send */
+  struct cmsghdr *cm1 = CMSG_FIRSTHDR (&wmsg);
+  cm1->cmsg_len = CMSG_LEN (sizeof (struct ucred));
+  cm1->cmsg_level = AF_UNIX;
+  cm1->cmsg_type = SCM_CREDENTIALS;
+  struct ucred *uc = (void *) CMSG_DATA (cm1);
+  uc->pid = getpid ();
+  uc->uid = getuid ();
+  uc->gid = getgid ();
+  struct cmsghdr *cm2 = CMSG_NXTHDR (&wmsg, cm1);
+  cm2->cmsg_len = CMSG_LEN (sizeof (int));
+  cm2->cmsg_level = AF_UNIX;
+  cm2->cmsg_type = SCM_RIGHTS;
+  int *pfd = (void *) CMSG_DATA (cm2);
+  *pfd = 2;
+  /* do the syscalls */
+  marker1 ();
+  socketpair (AF_UNIX, SOCK_DGRAM, 0, fds);
+  setsockopt (fds[0], SOL_SOCKET, SO_PASSCRED, &itrue, sizeof itrue);
+  sendmsg (fds[1], &wmsg, 0);
+  recvmsg (fds[0], &rmsg, 0);
+  marker2 ();
+  return 0;
+}

gdb/testsuite/gdb.reverse/recvmsg-reverse.exp

@@ -0,0 +1,65 @@
+# Copyright 2015 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 <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+#
+# This test tests socketpair and recvmsg syscalls for reverse execution.
+#
+
+if ![supports_reverse] {
+    return
+}
+
+standard_testfile
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
+    return -1
+}
+
+runto main
+
+if [supports_process_record] {
+    # Activate process record/replay
+    gdb_test_no_output "record" "Turn on process record"
+}
+
+gdb_test "break marker1" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker1"
+
+gdb_test "break marker2" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker2"
+
+gdb_continue_to_breakpoint "marker2" ".*$srcfile:.*"
+
+gdb_test "reverse-continue" ".*$srcfile:$decimal.*" "reverse to marker1"
+
+# If the variables were recorded properly on syscall, the old contents will
+# be remembered.  If not, new contents will be used, and the test will fail.
+
+# rdata should be "xxxx", not "cdab"
+gdb_test "print rdata" ".* = \"xxxx\"" "check recvmsg record - rdata"
+
+# rmsg.msg_flags should be zeros, not MSG_TRUNC | MSG_CTRUNC
+gdb_test "print rmsg.msg_flags" ".* = 0" "check recvmsg record - rmsg"
+
+# rmsg.msg_controllen should be sizeof rc, not actual size of control data
+# (7 bytes less)
+gdb_test "print rmsg.msg_controllen - sizeof rc" ".* = 0" "check recvmsg record - rmsg"
+
+# rc should be zeros, not received cmsg
+gdb_test "print ((struct cmsghdr *)rc)->cmsg_len" ".* = 0" "check recvmsg record - cmsg"

gdb/testsuite/gdb.reverse/time-reverse.c

@@ -0,0 +1,42 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008-2015 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 <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <time.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+void
+marker1 (void)
+{
+}
+
+void
+marker2 (void)
+{
+}
+
+time_t time_global = -1;
+
+int
+main (void)
+{
+  marker1 ();
+  syscall (SYS_time, &time_global);
+  marker2 ();
+  return 0;
+}

gdb/testsuite/gdb.reverse/time-reverse.exp

@@ -0,0 +1,55 @@
+# Copyright 2015 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 <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+#
+# This test tests time syscall for reverse execution.
+#
+
+if ![supports_reverse] {
+    return
+}
+
+standard_testfile
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
+    return -1
+}
+
+runto main
+
+if [supports_process_record] {
+    # Activate process record/replay
+    gdb_test_no_output "record" "Turn on process record"
+}
+
+gdb_test "break marker1" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker1"
+
+gdb_test "break marker2" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker2"
+
+gdb_continue_to_breakpoint "marker2" ".*$srcfile:.*"
+
+gdb_test "reverse-continue" ".*$srcfile:$decimal.*" "reverse to marker1"
+
+# If the variable was recorded properly on syscall, the old contents (-1)
+# will be remembered.  If not, new contents (current time) will be used,
+# and the test will fail.
+
+gdb_test "print time_global" ".* = -1" "check time record"

gdb/testsuite/gdb.reverse/waitpid-reverse.c

@@ -0,0 +1,44 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008-2015 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 <http://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+
+void
+marker1 (void)
+{
+}
+
+void
+marker2 (void)
+{
+}
+
+int status = -1;
+
+int
+main (void)
+{
+  marker1 ();
+  if (!fork ())
+    _exit (123);
+  else
+    waitpid (-1, &status, 0);
+  marker2 ();
+  return 0;
+}

gdb/testsuite/gdb.reverse/waitpid-reverse.exp

@@ -0,0 +1,55 @@
+# Copyright 2015 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 <http://www.gnu.org/licenses/>.
+
+# This file is part of the gdb testsuite.
+
+#
+# This test tests waitpid syscall for reverse execution.
+#
+
+if ![supports_reverse] {
+    return
+}
+
+standard_testfile
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
+    return -1
+}
+
+runto main
+
+if [supports_process_record] {
+    # Activate process record/replay
+    gdb_test_no_output "record" "Turn on process record"
+}
+
+gdb_test "break marker1" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker1"
+
+gdb_test "break marker2" \
+    "Breakpoint $decimal at $hex: file .*$srcfile, line $decimal.*" \
+    "set breakpoint at marker2"
+
+gdb_continue_to_breakpoint "marker2" ".*$srcfile:.*"
+
+gdb_test "reverse-continue" ".*$srcfile:$decimal.*" "reverse to marker1"
+
+# If the variable was recorded properly on syscall, the old contents (-1)
+# will be remembered.  If not, new contents (status) will be used, and
+# the test will fail.
+
+gdb_test "print status" ".* = -1" "check waitpid record"