Add sandman

1 files changed, 72 insertions, 0 deletions

diff --git a/sandman.m b/sandman.m
new file mode 100644
index 0000000..12a4817
--- /dev/null
+++ b/sandman.m
@@ -0,0 +1,72 @@
+/* Copyright (C) 2018  Curtis McEnroe <june@causal.agency>
+ *
+ * This program 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.
+ *
+ * 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 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/>.
+ */
+
+#import <Cocoa/Cocoa.h>
+#import <err.h>
+#import <signal.h>
+#import <stdlib.h>
+#import <sysexits.h>
+#import <unistd.h>
+
+void sigchld(int sig) {
+	(void)sig;
+	int status;
+	pid_t pid = wait(&status);
+	if (pid < 0) err(EX_OSERR, "wait");
+	if (WIFSIGNALED(status)) {
+		_exit(128 + WTERMSIG(status));
+	} else {
+		_exit(WEXITSTATUS(status));
+	}
+}
+
+int main(int argc, char *argv[]) {
+	if (argc < 2) return EX_USAGE;
+
+	signal(SIGCHLD, sigchld);
+
+	pid_t pid = fork();
+	if (pid < 0) err(EX_OSERR, "fork");
+
+	if (!pid) {
+		execvp(argv[1], &argv[1]);
+		err(EX_NOINPUT, "%s", argv[1]);
+	}
+
+	NSWorkspace *workspace = [NSWorkspace sharedWorkspace];
+	NSNotificationCenter *center = [workspace notificationCenter];
+	NSOperationQueue *main = [NSOperationQueue mainQueue];
+
+	[center addObserverForName:NSWorkspaceWillSleepNotification
+						object:nil
+						 queue:main
+					usingBlock:^(NSNotification *note) {
+						(void)note;
+						int error = kill(pid, SIGTSTP);
+						if (error) err(EX_UNAVAILABLE, "kill %d", pid);
+					}];
+
+	[center addObserverForName:NSWorkspaceDidWakeNotification
+						object:nil
+						 queue:main
+					usingBlock:^(NSNotification *note) {
+						(void)note;
+						int error = kill(pid, SIGCONT);
+						if (error) err(EX_UNAVAILABLE, "kill %d", pid);
+					}];
+
+	[[NSApplication sharedApplication] run];
+}