1 files changed, 110 insertions, 0 deletions

diff --git a/src/lib/util/signal.c b/src/lib/util/signal.c
new file mode 100644
index 000000000..67849a7d6
--- /dev/null
+++ b/src/lib/util/signal.c
@@ -0,0 +1,110 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2001, 2002, 2006 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
+
+     GNUnet 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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+
+/**
+ * @file util/signal.c
+ * @brief code for installing and uninstalling signal handlers
+ * @author Christian Grothoff
+ */
+
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+
+#define LOG(kind, ...) GNUNET_log_from (kind, "util-signal", __VA_ARGS__)
+
+
+struct GNUNET_SIGNAL_Context
+{
+  struct GNUNET_SIGNAL_Context *next;
+
+  struct GNUNET_SIGNAL_Context *prev;
+
+  int sig;
+
+  GNUNET_SIGNAL_Handler method;
+
+  struct sigaction oldsig;
+};
+
+static struct GNUNET_SIGNAL_Context *sc_head;
+
+static struct GNUNET_SIGNAL_Context *sc_tail;
+
+struct GNUNET_SIGNAL_Context *
+GNUNET_SIGNAL_handler_install (int signum, GNUNET_SIGNAL_Handler handler)
+{
+  struct GNUNET_SIGNAL_Context *ret;
+
+  struct sigaction sig;
+
+  ret = GNUNET_new (struct GNUNET_SIGNAL_Context);
+  ret->sig = signum;
+  ret->method = handler;
+
+  memset (&sig, 0, sizeof(sig));
+  sig.sa_handler = (void *) handler;
+  sigemptyset (&sig.sa_mask);
+#ifdef SA_INTERRUPT
+  sig.sa_flags = SA_INTERRUPT;  /* SunOS */
+#else
+  sig.sa_flags = SA_RESTART;
+#endif
+  sigaction (signum, &sig, &ret->oldsig);
+
+  GNUNET_CONTAINER_DLL_insert_tail (sc_head, sc_tail, ret);
+  return ret;
+}
+
+
+void
+GNUNET_SIGNAL_handler_uninstall (struct GNUNET_SIGNAL_Context *ctx)
+{
+  struct sigaction sig;
+
+  sigemptyset (&sig.sa_mask);
+  sigaction (ctx->sig, &ctx->oldsig, &sig);
+
+  GNUNET_CONTAINER_DLL_remove (sc_head, sc_tail, ctx);
+  GNUNET_free (ctx);
+}
+
+
+/**
+ * Raise the given signal by calling the installed signal handlers.  This will
+ * not use the @em raise() system call but only calls the handlers registered
+ * through GNUNET_SIGNAL_handler_install().
+ *
+ * @param sig the signal to raise
+ */
+void
+GNUNET_SIGNAL_raise (const int sig)
+{
+  struct GNUNET_SIGNAL_Context *ctx;
+
+  for (ctx = sc_head; NULL != ctx; ctx = ctx->next)
+  {
+    if (sig != ctx->sig)
+      continue;
+    if (NULL == ctx->method)
+      continue;
+    ctx->method ();
+  }
+}