Make signal handler setup/teardown two common functions instead of six,

and reset SIGCHLD after fork to fix problems with some shells. From
Romain Francois.

1 files changed, 90 insertions, 0 deletions

diff --git a/usr.bin/tmux/signal.c b/usr.bin/tmux/signal.c
new file mode 100644
index 00000000000..8e34243e265
--- /dev/null
+++ b/usr.bin/tmux/signal.c
@@ -0,0 +1,90 @@
+/* $OpenBSD: signal.c,v 1.1 2010/05/03 16:06:32 nicm Exp $ */
+
+/*
+ * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
+ * Copyright (c) 2010 Romain Francoise <rfrancoise@debian.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <signal.h>
+#include <string.h>
+
+#include "tmux.h"
+
+struct event	ev_sigchld;
+struct event	ev_sigcont;
+struct event	ev_sigterm;
+struct event	ev_sigusr1;
+struct event	ev_sigwinch;
+
+void
+set_signals(void(*handler)(int, short, void *))
+{
+	struct sigaction	sigact;
+
+	memset(&sigact, 0, sizeof sigact);
+	sigemptyset(&sigact.sa_mask);
+	sigact.sa_flags = SA_RESTART;
+	sigact.sa_handler = SIG_IGN;
+	if (sigaction(SIGINT, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGHUP, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+
+	signal_set(&ev_sigchld, SIGCHLD, handler, NULL);
+	signal_add(&ev_sigchld, NULL);
+	signal_set(&ev_sigcont, SIGCONT, handler, NULL);
+	signal_add(&ev_sigcont, NULL);
+	signal_set(&ev_sigterm, SIGTERM, handler, NULL);
+	signal_add(&ev_sigterm, NULL);
+	signal_set(&ev_sigusr1, SIGUSR1, handler, NULL);
+	signal_add(&ev_sigusr1, NULL);
+	signal_set(&ev_sigwinch, SIGWINCH, handler, NULL);
+	signal_add(&ev_sigwinch, NULL);
+}
+
+void
+clear_signals(void)
+{
+	struct sigaction	sigact;
+
+	memset(&sigact, 0, sizeof sigact);
+	sigemptyset(&sigact.sa_mask);
+	sigact.sa_flags = SA_RESTART;
+	sigact.sa_handler = SIG_DFL;
+	if (sigaction(SIGINT, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+	if (sigaction(SIGHUP, &sigact, NULL) != 0)
+		fatal("sigaction failed");
+
+	event_del(&ev_sigchld);
+	event_del(&ev_sigcont);
+	event_del(&ev_sigterm);
+	event_del(&ev_sigusr1);
+	event_del(&ev_sigwinch);
+}