Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 110 insertions, 0 deletions

diff --git a/libgimpbase/gimpsignal.c b/libgimpbase/gimpsignal.c
new file mode 100644
index 0000000..a0221f3
--- /dev/null
+++ b/libgimpbase/gimpsignal.c
@@ -0,0 +1,110 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * This library 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 3 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ *
+ * $Revision$
+ */
+
+#include "config.h"
+
+#define _GNU_SOURCE  /* for the sigaction stuff */
+
+#include <glib.h>
+
+#include "gimpsignal.h"
+
+
+/**
+ * SECTION: gimpsignal
+ * @title: gimpsignal
+ * @short_description: Portable signal handling.
+ * @see_also: signal(2), signal(5 or 7), sigaction(2).
+ *
+ * Portable signal handling.
+ **/
+
+
+/* Courtesy of Austin Donnelly 06-04-2000 to address bug #2742 */
+
+/**
+ * gimp_signal_private:
+ * @signum: Selects signal to be handled see man 5 signal (or man 7 signal)
+ * @handler: Handler that maps to signum. Invoked by O/S.
+ *           Handler gets signal that caused invocation. Corresponds
+ *           to the @sa_handler field of the @sigaction struct.
+ * @flags: Preferences. OR'ed SA_&lt;xxx&gt;. See man sigaction. Corresponds
+ *         to the @sa_flags field of the @sigaction struct.
+ *
+ * This function furnishes a workalike for signal(2) but
+ * which internally invokes sigaction(2) after certain
+ * sa_flags are set; these primarily to ensure restarting
+ * of interrupted system calls. See sigaction(2)  It is a
+ * aid to transition and not new development: that effort
+ * should employ sigaction directly. [gosgood 18.04.2000]
+ *
+ * Cause @handler to be run when @signum is delivered.  We
+ * use sigaction(2) rather than signal(2) so that we can control the
+ * signal handler's environment completely via @flags: some signal(2)
+ * implementations differ in their semantics, so we need to nail down
+ * exactly what we want. [austin 06.04.2000]
+ *
+ * Returns: A reference to the signal handling function which was
+ *          active before the call to gimp_signal_private().
+ */
+GimpSignalHandlerFunc
+gimp_signal_private (gint                   signum,
+                     GimpSignalHandlerFunc  handler,
+                     gint                   flags)
+{
+#ifndef G_OS_WIN32
+  gint ret;
+  struct sigaction sa;
+  struct sigaction osa;
+
+  /*  The sa_handler (mandated by POSIX.1) and sa_sigaction (a
+   *  common extension) are often implemented by the OS as members
+   *  of a union.  This means you CAN NOT set both, you set one or
+   *  the other.  Caveat programmer!
+   */
+
+  /*  Passing gimp_signal_private a gimp_sighandler of NULL is not
+   *  an error, and generally results in the action for that signal
+   *  being set to SIG_DFL (default behavior).  Many OSes define
+   *  SIG_DFL as (void (*)()0, so setting sa_handler to NULL is
+   *  the same thing as passing SIG_DFL to it.
+   */
+  sa.sa_handler = handler;
+
+  /*  Mask all signals while handler runs to avoid re-entrancy
+   *  problems.
+   */
+  sigfillset (&sa.sa_mask);
+
+  sa.sa_flags = flags;
+
+  ret = sigaction (signum, &sa, &osa);
+
+  if (ret < 0)
+    g_error ("unable to set handler for signal %d\n", signum);
+
+  return (GimpSignalHandlerFunc) osa.sa_handler;
+#else
+  return NULL;                  /* Or g_error()? Should all calls to
+                                 * this function really be inside
+                                 * #ifdef G_OS_UNIX?
+                                 */
+#endif
+}