From: Ben Gras <ben@minix3.org>
Date: Fri, 1 Jul 2005 18:00:10 +0000 (+0000)
Subject: New nice utility, imported from FreeBSD, used to run processes at a different
X-Git-Tag: v3.1.0~655
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doxygen.log?a=commitdiff_plain;h=7a31b9aa12faf781240b764cdf29dec7a667207f;p=minix.git

New nice utility, imported from FreeBSD, used to run processes at a different
priority.
---

diff --git a/commands/simple/Makefile b/commands/simple/Makefile
index 524bd740b..60f8e5c53 100755
--- a/commands/simple/Makefile
+++ b/commands/simple/Makefile
@@ -124,6 +124,7 @@ ALL	= \
 	mt \
 	nm \
 	nonamed \
+	nice \
 	od \
 	passwd \
 	paste \
@@ -539,6 +540,10 @@ nm:	nm.c
 	$(CCLD) -o $@ $?
 	@install -S 32kw $@
 
+nice:	nice.c
+	$(CCLD) -o $@ $?
+	@install -S 8kw $@
+
 nonamed:	nonamed.c
 	$(CCLD) -o $@ $?
 	@install -S 8kw $@
@@ -933,6 +938,7 @@ install:	\
 	/usr/bin/mount \
 	/usr/bin/mt \
 	/usr/bin/nm \
+	/usr/bin/nice \
 	/usr/bin/nonamed \
 	/usr/bin/od \
 	/usr/bin/passwd \
@@ -1316,6 +1322,9 @@ install:	\
 /usr/bin/nm:	nm
 	install -cs -o bin $? $@
 
+/usr/bin/nice:	nice
+	install -cs -o bin $? $@
+
 /usr/bin/nonamed:	nonamed
 	install -cs -o bin $? $@
 
diff --git a/commands/simple/nice.c b/commands/simple/nice.c
new file mode 100644
index 000000000..db251633f
--- /dev/null
+++ b/commands/simple/nice.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 1989, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#define	DEFNICE	10
+
+void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	long niceness = DEFNICE;
+	int ch;
+	char *ep;
+	char arg1[10];
+
+	/* Obsolescent syntax: -number, --number */
+	if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' ||
+	    isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) {
+		snprintf(arg1, sizeof(arg1), "-n%s", argv[1] + 1);
+		argv[1] = arg1;
+	}
+
+	while ((ch = getopt(argc, argv, "n:")) != -1) {
+		switch (ch) {
+		case 'n':
+			errno = 0;
+			niceness = strtol(optarg, &ep, 10);
+			if (ep == optarg || *ep != '\0' || errno ||
+			    niceness < INT_MIN || niceness > INT_MAX) {
+				fprintf(stderr, "%s: invalid nice value", optarg);
+				return 1;
+			}
+			break;
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc == 0)
+		usage();
+
+	errno = 0;
+	niceness += getpriority(PRIO_PROCESS, 0);
+	if (errno) {
+		perror("getpriority");
+		return 1;
+	}
+	if (setpriority(PRIO_PROCESS, 0, (int)niceness)) {
+		perror("setpriority");
+		return 1;
+	}
+	errno = 0;
+	execvp(*argv, argv);
+	perror("execvp");
+	return 1;
+}
+
+void
+usage(void)
+{
+
+	(void)fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n");
+	exit(1);
+}