From 5fd83771641d15c418f747bd343ba6738d3875f7 Mon Sep 17 00:00:00 2001
From: Cameron Katri <me@cameronkatri.com>
Date: Sun, 9 May 2021 14:20:58 -0400
Subject: Import macOS userland

adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
---
 system_cmds/mean.tproj/mean.c | 128 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 system_cmds/mean.tproj/mean.c

(limited to 'system_cmds/mean.tproj/mean.c')

diff --git a/system_cmds/mean.tproj/mean.c b/system_cmds/mean.tproj/mean.c
new file mode 100644
index 0000000..87ecdc2
--- /dev/null
+++ b/system_cmds/mean.tproj/mean.c
@@ -0,0 +1,128 @@
+/*
+ *  mean.c
+ *  mean - lower process priorities with more force than nice
+ *
+ *  Created by Lucia Ballard on 9/16/09.
+ *  Copyright 2009-2016 Apple Inc. All rights reserved.
+ *
+ */
+
+#include <mach/mach.h>
+#include <mach/task.h>
+#include <mach/thread_act.h>
+#include <mach/thread_policy.h>
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void usage(void);
+
+void
+usage(void)
+{
+		fprintf(stderr, "Usage: mean -[r|s|u] <pid>\n");
+		fprintf(stderr,  "\tLower <pid>'s priority.\n");
+		fprintf(stderr,  "\t-u: return <pid> to normal priority\n");
+		fprintf(stderr,  "\t-r: resume <pid>\n");
+		fprintf(stderr,  "\t-s: suspend <pid>\n");
+		exit(0);
+}
+
+int
+main(int argc, char **argv)
+{
+	int pid, err, i, ch;
+	unsigned int count;
+	mach_port_t task;
+	thread_act_array_t threads;
+	thread_precedence_policy_data_t policy;
+
+	boolean_t do_high = 0, do_resume = 0, do_suspend = 0;
+	boolean_t do_low = 1;
+
+	if (argc < 2)
+		usage();
+
+	while ((ch = getopt(argc, argv, "rsu")) != -1)
+	switch (ch) {
+		case 'u':
+			do_high = 1;
+			do_low = 0;
+			continue;
+		case 'r':
+			do_resume = 1;
+			do_low = 0;
+			continue;
+		case 's':
+			do_suspend = 1;
+			do_low = 0;
+			continue;
+		default:
+			usage();
+	}
+
+	argc -= optind; argv += optind;
+
+	if (argc == 0)
+		usage();
+
+	pid = atoi(*argv);
+	if (!pid)
+		usage();
+
+	err = task_for_pid(mach_task_self(), pid, &task);
+	if (err) {
+		fprintf(stderr, "Failed to get task port (%d)\n", err);
+		exit(0);
+	}
+
+	if (do_low || do_high) {
+
+		err = task_threads(task, &threads, &count);
+		if (err) {
+			fprintf(stderr, "Failed to get thread list (%d)\n", err);
+			exit(0);
+		}
+
+		if (do_low)
+			policy.importance = -100;
+		else
+			policy.importance = 0;
+
+		for (i = 0; i < count; i++) {
+			err = thread_policy_set(threads[i],
+					THREAD_PRECEDENCE_POLICY,
+					(thread_policy_t) &policy,
+					THREAD_PRECEDENCE_POLICY_COUNT);
+			if (err) {
+				fprintf(stderr, "Failed to set thread priority (%d)\n", err);
+				exit(0);
+			}
+		}
+
+		printf("Process %d's threads set to %s priority.\n", pid,
+				(do_low ? "lowest" : "highest"));
+	}
+
+	if (do_suspend) {
+		err = task_suspend(task);
+		if (err) {
+			fprintf(stderr, "Failed to suspend task (%d)\n", err);
+		} else {
+			printf("Process %d suspended.\n", pid);
+		}
+	}
+
+	if (do_resume) {
+		err = task_resume(task);
+		if (err) {
+			fprintf(stderr, "Failed to resume task (%d)\n", err);
+		} else {
+			printf("Process %d resumed.\n", pid);
+		}
+	}
+
+	return 0;
+}
-- 
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