Add sandman wrapper

3 files changed, 125 insertions, 0 deletions

diff --git a/scripts/.gitignore b/scripts/.gitignore
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+++ b/scripts/.gitignore
@@ -0,0 +1 @@
+sandman
diff --git a/scripts/sandman.1 b/scripts/sandman.1
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index 0000000..35765ec
--- /dev/null
+++ b/scripts/sandman.1
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+.Dd February 12, 2020
+.Dt SANDMAN 1
+.Os
+.
+.Sh NAME
+.Nm sandman
+.Nd sleep wrapper
+.
+.Sh SYNOPSIS
+.Nm
+.Op Fl t Ar secs
+.Ar command ...
+.
+.Sh DESCRIPTION
+The
+.Nm
+utility wraps a
+.Ar command ,
+sending it
+.Dv SIGHUP
+when the system goes to sleep,
+and restarting it
+when the system wakes.
+.
+.Pp
+The arguments are as follows:
+.Bl -tag -width Ds
+.It Fl t Ar secs
+Wait for
+.Ar secs
+before restarting the process.
+The default is 8 seconds.
+.El
+.
+.Sh AUTHORS
+.An June Bug Aq Mt june@causal.agency
diff --git a/scripts/sandman.m b/scripts/sandman.m
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index 0000000..838920d
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+++ b/scripts/sandman.m
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+/* Copyright (C) 2019, 2020  C. McEnroe <june@causal.agency>
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ */
+
+#import <Cocoa/Cocoa.h>
+#import <err.h>
+#import <signal.h>
+#import <stdio.h>
+#import <stdlib.h>
+#import <sysexits.h>
+#import <unistd.h>
+
+typedef unsigned uint;
+
+static pid_t pid;
+static void spawn(char *argv[]) {
+	pid = fork();
+	if (pid < 0) err(EX_OSERR, "fork");
+	if (pid) return;
+	execvp(argv[0], argv);
+	err(EX_CONFIG, "%s", argv[0]);
+}
+
+static void handler(int signal) {
+	(void)signal;
+	int status;
+	pid_t pid = wait(&status);
+	if (pid < 0) _exit(EX_OSERR);
+	_exit(status);
+}
+
+int main(int argc, char *argv[]) {
+	uint delay = 8;
+
+	int opt;
+	while (0 < (opt = getopt(argc, argv, "t:"))) {
+		switch (opt) {
+			break; case 't': delay = strtoul(optarg, NULL, 10);
+			break; default:  return EX_USAGE;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (!argc) errx(EX_USAGE, "command required");
+
+	NSWorkspace *workspace = [NSWorkspace sharedWorkspace];
+	NSNotificationCenter *notifCenter = [workspace notificationCenter];
+
+	[notifCenter addObserverForName:NSWorkspaceWillSleepNotification
+							 object:nil
+							  queue:nil
+						 usingBlock:^(NSNotification *notif) {
+							 (void)notif;
+							 signal(SIGCHLD, SIG_IGN);
+							 int error = kill(pid, SIGHUP);
+							 if (error) err(EX_UNAVAILABLE, "kill");
+							 int status;
+							 wait(&status);
+						 }];
+
+	[notifCenter addObserverForName:NSWorkspaceDidWakeNotification
+							 object:nil
+							  queue:nil
+						 usingBlock:^(NSNotification *notif) {
+							 (void)notif;
+							 warnx("waiting %u seconds...", delay);
+							 sleep(delay);
+							 signal(SIGCHLD, handler);
+							 spawn(argv);
+						 }];
+
+	signal(SIGCHLD, handler);
+	spawn(argv);
+
+	[[NSApplication sharedApplication] run];
+}