[PATCH 4/4] Add a unit test for scoped_ignore_sigpipe

[Lancelot SIX]

Hi,

There is a tiny typo (see above).

Lancelot.

On Tue, Jun 15, 2021 at 12:14:29PM +0100, Pedro Alves wrote:
> gdb/ChangeLog:
> yyyy-mm-dd  Pedro Alves  <pedro@palves.net>
> 
> 	* Makefile.in (SELFTESTS_SRCS): Add
> 	unittests/scoped_ignore_signal-selftests.c.
> 	* unittests/scoped_ignore_signal-selftests.c: New.
> 
> Change-Id: Idce24aa9432a3f1eb7065bc9aa030b1d0d7dcad5
> ---
>  gdb/Makefile.in                               |   1 +
>  .../scoped_ignore_signal-selftests.c          | 125 ++++++++++++++++++
>  2 files changed, 126 insertions(+)
>  create mode 100644 gdb/unittests/scoped_ignore_signal-selftests.c
> 
> diff --git a/gdb/Makefile.in b/gdb/Makefile.in
> index 881ebde8fb0..1bc97885536 100644
> --- a/gdb/Makefile.in
> +++ b/gdb/Makefile.in
> @@ -461,6 +461,7 @@ SELFTESTS_SRCS = \
>  	unittests/mkdir-recursive-selftests.c \
>  	unittests/rsp-low-selftests.c \
>  	unittests/scoped_fd-selftests.c \
> +	unittests/scoped_ignore_signal-selftests.c \
>  	unittests/scoped_mmap-selftests.c \
>  	unittests/scoped_restore-selftests.c \
>  	unittests/search-memory-selftests.c \
> diff --git a/gdb/unittests/scoped_ignore_signal-selftests.c b/gdb/unittests/scoped_ignore_signal-selftests.c
> new file mode 100644
> index 00000000000..f727b464567
> --- /dev/null
> +++ b/gdb/unittests/scoped_ignore_signal-selftests.c
> @@ -0,0 +1,125 @@
> +/* Self tests for scoped_ignored_signal for GDB, the GNU debugger.
> +
> +   Copyright (C) 2021 Free Software Foundation, Inc.
> +
> +   This file is part of GDB.
> +
> +   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 "defs.h"
> +#include "gdbsupport/scoped_ignore_signal.h"
> +#include "gdbsupport/selftest.h"
> +#include "gdbsupport/scope-exit.h"
> +#include <unistd.h>
> +#include <signal.h>
> +
> +namespace selftests {
> +namespace scoped_ignore_sig {
> +
> +#ifdef SIGPIPE
> +
> +/* True if the SIGPIPE handler ran.  */
> +static sig_atomic_t got_sigpipe = 0;
> +
> +/* SIGPIPE handler for testing.  */
> +
> +static void
> +handle_sigpipe (int)
> +{
> +  got_sigpipe = 1;
> +}
> +
> +/* Test scoped_ignore_sigpipe.  */
> +
> +static void
> +test_sigpipe ()
> +{
> +  auto *osig = signal (SIGPIPE, handle_sigpipe);
> +  SCOPE_EXIT { signal (SIGPIPE, osig); };
> +
> +#ifdef HAVE_SIGPROCMASK
> +  /* Make sure SIGPIPE isn't blocked.  */
> +  sigset_t set, old_state;
> +  sigemptyset (&set);
> +  sigaddset (&set, SIGPIPE);
> +  sigprocmask (SIG_UNBLOCK, &set, &old_state);
> +  SCOPE_EXIT { sigprocmask (SIG_SETMASK, &old_state, nullptr); };
> +#endif
> +
> +  /* Create pipe, and close read end so that writes to the pipe fail
> +     with EPIPE.  */
> +
> +  int fd[2];
> +  char c = 0xff;
> +  int r;
> +
> +  r = pipe (fd);
> +  SELF_CHECK (r == 0);
> +
> +  close (fd[0]); SCOPE_EXIT { close (fd[1]); };
> +
> +  /* Check that writing to the pipe results in EPIPE.  EXPECT_SIG
> +     indicates whether a SIGPIPE signal is expected.  */
> +  auto check_pipe_write = [&] (bool expect_sig)
> +  {
> +    got_sigpipe = 0;
> +    errno = 0;
> +
> +    r = write (fd[1], &c, 1);
> +    SELF_CHECK (r == -1 && errno == EPIPE
> +		&& got_sigpipe == expect_sig);
> +  };
> +
> +  /* Check that without a scoped_ignore_sigpipe in scope we indeed get
> +     a SIGPIPE signal.  */
> +  check_pipe_write (true);
> +
> +  /* Now check that with a scoped_ignore_sigpipe in scope, SIGPIPE is
> +     ignored/blocked.  */
> +  {
> +    scoped_ignore_sigpipe ignore1;
> +
> +    check_pipe_write (false);
> +
> +    /* Check that scoped_ignore_sigpipe nests correctly.  */
> +    {
> +      scoped_ignore_sigpipe ignore2;
> +
> +      check_pipe_write (false);
> +    }
> +
> +    /* If nesting works correctly, this write results in no
> +       SIGPIPE.  */
> +    check_pipe_write (false);
> +  }
> +
> +  /* No scoped_ignore_sigpipe is is scope anymore, so this should

s/is is/is in/

> +     result in a SIGPIPE signal.  */
> +  check_pipe_write (true);
> +}
> +
> +#endif /* SIGPIPE */
> +
> +} /* namespace scoped_ignore_sig */
> +} /* namespace selftests */
> +
> +void _initialize_scoped_ignore_signal_selftests ();
> +void
> +_initialize_scoped_ignore_signal_selftests ()
> +{
> +#ifdef SIGPIPE
> +  selftests::register_test ("scoped_ignore_sigpipe",
> +			    selftests::scoped_ignore_sig::test_sigpipe);
> +#endif
> +}
> -- 
> 2.26.2
>