1 files changed, 99 insertions, 0 deletions
diff --git a/renice.c b/renice.c
new file mode 100644
index 0000000..aabd7a3
--- /dev/null
+++ b/renice.c
@@ -0,0 +1,99 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2011-2019, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _XOPEN_SOURCE 500
+#include <errno.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <unistd.h>
+
+static int renice(int increment, int which, const char *id)
+{
+	id_t who = atoi(id);
+
+	errno = 0;
+	int current = getpriority(which, who);
+	if (current == -1 && errno != 0) {
+		fprintf(stderr, "renice: %s: %s\n", id, strerror(errno));
+		return 1;
+	}
+
+	if (setpriority(which, who, current - increment) != 0) {
+		fprintf(stderr, "renice: %s: %s\n", id, strerror(errno));
+		return 1;
+	}
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+	int which = PRIO_PROCESS;
+	char *increment = NULL;
+
+	int c;
+	while ((c = getopt(argc, argv, "gn:pu")) != -1) {
+		switch (c) {
+		case 'p':
+			which = PRIO_PROCESS;
+			break;
+
+		case 'u':
+			which = PRIO_PGRP;
+			break;
+
+		case 'g':
+			which = PRIO_USER;
+			break;
+
+		case 'n':
+			increment = optarg;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (increment == NULL) {
+		fprintf(stderr, "renice: missing -n option\n");
+		return 1;
+	}
+	int inc = atoi(increment);
+
+	if (optind >= argc) {
+		fprintf(stderr, "renice: missing operands\n");
+		return 1;
+	}
+
+	int r = 0;
+	do {
+		r |= renice(inc, which, argv[optind++]);
+	} while (optind < argc);
+	return r;
+}