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Restart process in sandman

master
Curtis McEnroe 2019-07-02 18:04:27 -04:00
parent d8cffb8ae7
commit 39a752c46e
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GPG Key ID: CEA2F97ADCFCD77C
2 changed files with 40 additions and 19 deletions
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13
sandman.1
View File

@ -1,4 +1,4 @@
.Dd December 2, 2018
.Dd July 2, 2019
.Dt SANDMAN 1
.Os
.
@ -15,11 +15,12 @@
is a utility for Darwin systems.
It runs the
.Ar command
as a child process
and sends it the
.Dv SIGHUP
signal
when the system goes to sleep.
as a child process.
When the system goes to sleep,
the process is sent
.Dv SIGHUP .
When the system wakes up,
the process is restarted.
.
.Sh EXIT STATUS
.Nm

46
sandman.m
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
/* Copyright (C) 2019 C. 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
@ -21,36 +21,43 @@
#import <sysexits.h>
#import <unistd.h>
void handler(int sig) {
static volatile sig_atomic_t sleeping;
static void sigchld(int sig) {
(void)sig;
int status;
pid_t pid = wait(&status);
if (pid < 0) _exit(EX_OSERR);
if (WIFSIGNALED(status)) {
if (WIFSIGNALED(status) && WTERMSIG(status) != SIGHUP) {
_exit(128 + WTERMSIG(status));
} else {
} else if (!sleeping) {
_exit(WEXITSTATUS(status));
}
}
static pid_t spawn(char *argv[]) {
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (pid) return pid;
execvp(argv[0], argv);
err(EX_NOINPUT, "%s", argv[0]);
}
static pid_t pid;
int main(int argc, char *argv[]) {
if (argc < 2) return EX_USAGE;
sigset_t mask;
sigemptyset(&mask);
struct sigaction sa = {
.sa_handler = handler,
struct sigaction action = {
.sa_handler = sigchld,
.sa_mask = mask,
.sa_flags = SA_NOCLDSTOP | SA_RESTART,
};
sigaction(SIGCHLD, &sa, NULL);
sigaction(SIGCHLD, &action, NULL);
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (!pid) {
execvp(argv[1], &argv[1]);
err(EX_NOINPUT, "%s", argv[1]);
}
pid = spawn(&argv[1]);
[
[[NSWorkspace sharedWorkspace] notificationCenter]
@ -59,10 +66,23 @@ int main(int argc, char *argv[]) {
queue: nil
usingBlock: ^(NSNotification *note) {
(void)note;
sleeping = 1;
int error = kill(pid, SIGHUP);
if (error) err(EX_UNAVAILABLE, "kill %d", pid);
}
];
[
[[NSWorkspace sharedWorkspace] notificationCenter]
addObserverForName: NSWorkspaceDidWakeNotification
object: nil
queue: nil
usingBlock: ^(NSNotification *note) {
(void)note;
sleeping = 0;
pid = spawn(&argv[1]);
}
];
[[NSApplication sharedApplication] run];
}