New upstream version 1.1upstream/1.1

1 files changed, 0 insertions, 204 deletions

diff --git a/tests/sigaction.c b/tests/sigaction.c
deleted file mode 100644
index 953a6cae..00000000
--- a/tests/sigaction.c
+++ /dev/null
@@ -1,204 +0,0 @@
-/* POSIX compatible signal blocking.
-   Copyright (C) 2008-2022 Free Software Foundation, Inc.
-   Written by Eric Blake <ebb9@byu.net>, 2008.
-
-   This file is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of the
-   License, or (at your option) any later version.
-
-   This file 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 Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
-
-#include <config.h>
-
-/* Specification.  */
-#include <signal.h>
-
-#include <errno.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-/* This implementation of sigaction is tailored to native Windows behavior:
-   signal() has SysV semantics (ie. the handler is uninstalled before
-   it is invoked).  This is an inherent data race if an asynchronous
-   signal is sent twice in a row before we can reinstall our handler,
-   but there's nothing we can do about it.  Meanwhile, sigprocmask()
-   is not present, and while we can use the gnulib replacement to
-   provide critical sections, it too suffers from potential data races
-   in the face of an ill-timed asynchronous signal.  And we compound
-   the situation by reading static storage in a signal handler, which
-   POSIX warns is not generically async-signal-safe.  Oh well.
-
-   Additionally:
-     - We don't implement SA_NOCLDSTOP or SA_NOCLDWAIT, because SIGCHLD
-       is not defined.
-     - We don't implement SA_ONSTACK, because sigaltstack() is not present.
-     - We ignore SA_RESTART, because blocking native Windows API calls are
-       not interrupted anyway when an asynchronous signal occurs, and the
-       MSVCRT runtime never sets errno to EINTR.
-     - We don't implement SA_SIGINFO because it is impossible to do so
-       portably.
-
-   POSIX states that an application should not mix signal() and
-   sigaction().  We support the use of signal() within the gnulib
-   sigprocmask() substitute, but all other application code linked
-   with this module should stick with only sigaction().  */
-
-/* Check some of our assumptions.  */
-#if defined SIGCHLD || defined HAVE_SIGALTSTACK || defined HAVE_SIGINTERRUPT
-# error "Revisit the assumptions made in the sigaction module"
-#endif
-
-/* Out-of-range substitutes make a good fallback for uncatchable
-   signals.  */
-#ifndef SIGKILL
-# define SIGKILL (-1)
-#endif
-#ifndef SIGSTOP
-# define SIGSTOP (-1)
-#endif
-
-/* On native Windows, as of 2008, the signal SIGABRT_COMPAT is an alias
-   for the signal SIGABRT.  Only one signal handler is stored for both
-   SIGABRT and SIGABRT_COMPAT.  SIGABRT_COMPAT is not a signal of its own.  */
-#if defined _WIN32 && ! defined __CYGWIN__
-# undef SIGABRT_COMPAT
-# define SIGABRT_COMPAT 6
-#endif
-
-/* A signal handler.  */
-typedef void (*handler_t) (int signal);
-
-/* Set of current actions.  If sa_handler for an entry is NULL, then
-   that signal is not currently handled by the sigaction handler.  */
-static struct sigaction volatile action_array[NSIG] /* = 0 */;
-
-/* Signal handler that is installed for signals.  */
-static void
-sigaction_handler (int sig)
-{
-  handler_t handler;
-  sigset_t mask;
-  sigset_t oldmask;
-  int saved_errno = errno;
-  if (sig < 0 || NSIG <= sig || !action_array[sig].sa_handler)
-    {
-      /* Unexpected situation; be careful to avoid recursive abort.  */
-      if (sig == SIGABRT)
-        signal (SIGABRT, SIG_DFL);
-      abort ();
-    }
-
-  /* Reinstall the signal handler when required; otherwise update the
-     bookkeeping so that the user's handler may call sigaction and get
-     accurate results.  We know the signal isn't currently blocked, or
-     we wouldn't be in its handler, therefore we know that we are not
-     interrupting a sigaction() call.  There is a race where any
-     asynchronous instance of the same signal occurring before we
-     reinstall the handler will trigger the default handler; oh
-     well.  */
-  handler = action_array[sig].sa_handler;
-  if ((action_array[sig].sa_flags & SA_RESETHAND) == 0)
-    signal (sig, sigaction_handler);
-  else
-    action_array[sig].sa_handler = NULL;
-
-  /* Block appropriate signals.  */
-  mask = action_array[sig].sa_mask;
-  if ((action_array[sig].sa_flags & SA_NODEFER) == 0)
-    sigaddset (&mask, sig);
-  sigprocmask (SIG_BLOCK, &mask, &oldmask);
-
-  /* Invoke the user's handler, then restore prior mask.  */
-  errno = saved_errno;
-  handler (sig);
-  saved_errno = errno;
-  sigprocmask (SIG_SETMASK, &oldmask, NULL);
-  errno = saved_errno;
-}
-
-/* Change and/or query the action that will be taken on delivery of
-   signal SIG.  If not NULL, ACT describes the new behavior.  If not
-   NULL, OACT is set to the prior behavior.  Return 0 on success, or
-   set errno and return -1 on failure.  */
-int
-sigaction (int sig, const struct sigaction *restrict act,
-           struct sigaction *restrict oact)
-{
-  sigset_t mask;
-  sigset_t oldmask;
-  int saved_errno;
-
-  if (sig < 0 || NSIG <= sig || sig == SIGKILL || sig == SIGSTOP
-      || (act && act->sa_handler == SIG_ERR))
-    {
-      errno = EINVAL;
-      return -1;
-    }
-
-#ifdef SIGABRT_COMPAT
-  if (sig == SIGABRT_COMPAT)
-    sig = SIGABRT;
-#endif
-
-  /* POSIX requires sigaction() to be async-signal-safe.  In other
-     words, if an asynchronous signal can occur while we are anywhere
-     inside this function, the user's handler could then call
-     sigaction() recursively and expect consistent results.  We meet
-     this rule by using sigprocmask to block all signals before
-     modifying any data structure that could be read from a signal
-     handler; this works since we know that the gnulib sigprocmask
-     replacement does not try to use sigaction() from its handler.  */
-  if (!act && !oact)
-    return 0;
-  sigfillset (&mask);
-  sigprocmask (SIG_BLOCK, &mask, &oldmask);
-  if (oact)
-    {
-      if (action_array[sig].sa_handler)
-        *oact = action_array[sig];
-      else
-        {
-          /* Safe to change the handler at will here, since all
-             signals are currently blocked.  */
-          oact->sa_handler = signal (sig, SIG_DFL);
-          if (oact->sa_handler == SIG_ERR)
-            goto failure;
-          signal (sig, oact->sa_handler);
-          oact->sa_flags = SA_RESETHAND | SA_NODEFER;
-          sigemptyset (&oact->sa_mask);
-        }
-    }
-
-  if (act)
-    {
-      /* Safe to install the handler before updating action_array,
-         since all signals are currently blocked.  */
-      if (act->sa_handler == SIG_DFL || act->sa_handler == SIG_IGN)
-        {
-          if (signal (sig, act->sa_handler) == SIG_ERR)
-            goto failure;
-          action_array[sig].sa_handler = NULL;
-        }
-      else
-        {
-          if (signal (sig, sigaction_handler) == SIG_ERR)
-            goto failure;
-          action_array[sig] = *act;
-        }
-    }
-  sigprocmask (SIG_SETMASK, &oldmask, NULL);
-  return 0;
-
- failure:
-  saved_errno = errno;
-  sigprocmask (SIG_SETMASK, &oldmask, NULL);
-  errno = saved_errno;
-  return -1;
-}