Fresh start

1 files changed, 329 insertions, 0 deletions

diff --git a/jni/iconv/srclib/sigprocmask.c b/jni/iconv/srclib/sigprocmask.c
new file mode 100644
index 0000000..7b486a2
--- /dev/null
+++ b/jni/iconv/srclib/sigprocmask.c
@@ -0,0 +1,329 @@
+/* POSIX compatible signal blocking.
+   Copyright (C) 2006-2008 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2006.
+
+   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 <config.h>
+
+/* Specification.  */
+#include <signal.h>
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+/* We assume that a platform without POSIX signal blocking functions
+   also does not have the POSIX sigaction() function, only the
+   signal() function.  We also assume signal() has SysV semantics,
+   where any handler is uninstalled prior to being invoked.  This is
+   true for Woe32 platforms.  */
+
+/* We use raw signal(), but also provide a wrapper rpl_signal() so
+   that applications can query or change a blocked signal.  */
+#undef signal
+
+/* Provide invalid signal numbers as fallbacks if the uncatchable
+   signals are not defined.  */
+#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 __WIN32__) && ! defined __CYGWIN__
+# undef SIGABRT_COMPAT
+# define SIGABRT_COMPAT 6
+#endif
+#ifdef SIGABRT_COMPAT
+# define SIGABRT_COMPAT_MASK (1U << SIGABRT_COMPAT)
+#else
+# define SIGABRT_COMPAT_MASK 0
+#endif
+
+typedef void (*handler_t) (int);
+
+/* Handling of gnulib defined signals.  */
+
+#if GNULIB_defined_SIGPIPE
+static handler_t SIGPIPE_handler = SIG_DFL;
+#endif
+
+#if GNULIB_defined_SIGPIPE
+static handler_t
+ext_signal (int sig, handler_t handler)
+{
+  switch (sig)
+    {
+    case SIGPIPE:
+      {
+	handler_t old_handler = SIGPIPE_handler;
+	SIGPIPE_handler = handler;
+	return old_handler;
+      }
+    default: /* System defined signal */
+      return signal (sig, handler);
+    }
+}
+# define signal ext_signal
+#endif
+
+int
+sigismember (const sigset_t *set, int sig)
+{
+  if (sig >= 0 && sig < NSIG)
+    {
+      #ifdef SIGABRT_COMPAT
+      if (sig == SIGABRT_COMPAT)
+	sig = SIGABRT;
+      #endif
+
+      return (*set >> sig) & 1;
+    }
+  else
+    return 0;
+}
+
+int
+sigemptyset (sigset_t *set)
+{
+  *set = 0;
+  return 0;
+}
+
+int
+sigaddset (sigset_t *set, int sig)
+{
+  if (sig >= 0 && sig < NSIG)
+    {
+      #ifdef SIGABRT_COMPAT
+      if (sig == SIGABRT_COMPAT)
+	sig = SIGABRT;
+      #endif
+
+      *set |= 1U << sig;
+      return 0;
+    }
+  else
+    {
+      errno = EINVAL;
+      return -1;
+    }
+}
+
+int
+sigdelset (sigset_t *set, int sig)
+{
+  if (sig >= 0 && sig < NSIG)
+    {
+      #ifdef SIGABRT_COMPAT
+      if (sig == SIGABRT_COMPAT)
+	sig = SIGABRT;
+      #endif
+
+      *set &= ~(1U << sig);
+      return 0;
+    }
+  else
+    {
+      errno = EINVAL;
+      return -1;
+    }
+}
+
+
+int
+sigfillset (sigset_t *set)
+{
+  *set = ((2U << (NSIG - 1)) - 1) & ~ SIGABRT_COMPAT_MASK;
+  return 0;
+}
+
+/* Set of currently blocked signals.  */
+static volatile sigset_t blocked_set /* = 0 */;
+
+/* Set of currently blocked and pending signals.  */
+static volatile sig_atomic_t pending_array[NSIG] /* = { 0 } */;
+
+/* Signal handler that is installed for blocked signals.  */
+static void
+blocked_handler (int sig)
+{
+  /* Reinstall the handler, in case the signal occurs multiple times
+     while blocked.  There is an inherent race where an asynchronous
+     signal in between when the kernel uninstalled the handler and
+     when we reinstall it will trigger the default handler; oh
+     well.  */
+  signal (sig, blocked_handler);
+  if (sig >= 0 && sig < NSIG)
+    pending_array[sig] = 1;
+}
+
+int
+sigpending (sigset_t *set)
+{
+  sigset_t pending = 0;
+  int sig;
+
+  for (sig = 0; sig < NSIG; sig++)
+    if (pending_array[sig])
+      pending |= 1U << sig;
+  *set = pending;
+  return 0;
+}
+
+/* The previous signal handlers.
+   Only the array elements corresponding to blocked signals are relevant.  */
+static volatile handler_t old_handlers[NSIG];
+
+int
+sigprocmask (int operation, const sigset_t *set, sigset_t *old_set)
+{
+  if (old_set != NULL)
+    *old_set = blocked_set;
+
+  if (set != NULL)
+    {
+      sigset_t new_blocked_set;
+      sigset_t to_unblock;
+      sigset_t to_block;
+
+      switch (operation)
+	{
+	case SIG_BLOCK:
+	  new_blocked_set = blocked_set | *set;
+	  break;
+	case SIG_SETMASK:
+	  new_blocked_set = *set;
+	  break;
+	case SIG_UNBLOCK:
+	  new_blocked_set = blocked_set & ~*set;
+	  break;
+	default:
+	  errno = EINVAL;
+	  return -1;
+	}
+      to_unblock = blocked_set & ~new_blocked_set;
+      to_block = new_blocked_set & ~blocked_set;
+
+      if (to_block != 0)
+	{
+	  int sig;
+
+	  for (sig = 0; sig < NSIG; sig++)
+	    if ((to_block >> sig) & 1)
+	      {
+		pending_array[sig] = 0;
+		if ((old_handlers[sig] = signal (sig, blocked_handler)) != SIG_ERR)
+		  blocked_set |= 1U << sig;
+	      }
+	}
+
+      if (to_unblock != 0)
+	{
+	  sig_atomic_t received[NSIG];
+	  int sig;
+
+	  for (sig = 0; sig < NSIG; sig++)
+	    if ((to_unblock >> sig) & 1)
+	      {
+		if (signal (sig, old_handlers[sig]) != blocked_handler)
+		  /* The application changed a signal handler while the signal
+		     was blocked, bypassing our rpl_signal replacement.
+		     We don't support this.  */
+		  abort ();
+		received[sig] = pending_array[sig];
+		blocked_set &= ~(1U << sig);
+		pending_array[sig] = 0;
+	      }
+	    else
+	      received[sig] = 0;
+
+	  for (sig = 0; sig < NSIG; sig++)
+	    if (received[sig])
+	      raise (sig);
+	}
+    }
+  return 0;
+}
+
+/* Install the handler FUNC for signal SIG, and return the previous
+   handler.  */
+handler_t
+rpl_signal (int sig, handler_t handler)
+{
+  /* We must provide a wrapper, so that a user can query what handler
+     they installed even if that signal is currently blocked.  */
+  if (sig >= 0 && sig < NSIG && sig != SIGKILL && sig != SIGSTOP
+      && handler != SIG_ERR)
+    {
+      #ifdef SIGABRT_COMPAT
+      if (sig == SIGABRT_COMPAT)
+	sig = SIGABRT;
+      #endif
+
+      if (blocked_set & (1U << sig))
+	{
+	  /* POSIX states that sigprocmask and signal are both
+	     async-signal-safe.  This is not true of our
+	     implementation - there is a slight data race where an
+	     asynchronous interrupt on signal A can occur after we
+	     install blocked_handler but before we have updated
+	     old_handlers for signal B, such that handler A can see
+	     stale information if it calls signal(B).  Oh well -
+	     signal handlers really shouldn't try to manipulate the
+	     installed handlers of unrelated signals.  */
+	  handler_t result = old_handlers[sig];
+	  old_handlers[sig] = handler;
+	  return result;
+	}
+      else
+	return signal (sig, handler);
+    }
+  else
+    {
+      errno = EINVAL;
+      return SIG_ERR;
+    }
+}
+
+#if GNULIB_defined_SIGPIPE
+/* Raise the signal SIG.  */
+int
+rpl_raise (int sig)
+# undef raise
+{
+  switch (sig)
+    {
+    case SIGPIPE:
+      if (blocked_set & (1U << sig))
+	pending_array[sig] = 1;
+      else
+	{
+	  handler_t handler = SIGPIPE_handler;
+	  if (handler == SIG_DFL)
+	    exit (128 + SIGPIPE);
+	  else if (handler != SIG_IGN)
+	    (*handler) (sig);
+	}
+      return 0;
+    default: /* System defined signal */
+      return raise (sig);
+    }
+}
+#endif