lab util sleep solution

forbidden-game · Mar 15, 2023 · 0f654b3 · 0f654b3
1 parent f654383
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diff --git a/Makefile b/Makefile
@@ -193,6 +193,7 @@ UPROGS=\
 	$U/_grind\
 	$U/_wc\
 	$U/_zombie\
+	$U/_sleep
 
 
 

diff --git a/user/sleep.c b/user/sleep.c
@@ -0,0 +1,24 @@
+//
+// Created by ForbiddenGame on 2023/3/15.
+//
+
+#include "kernel/types.h"
+#include "user/user.h"
+
+int
+main(int argc, char* argv[])
+{
+	if(argc <= 1){
+		fprintf(2, "usage sleep [time]\n");
+		exit(1);
+	}
+
+	if(argv[1][0] == '-'){
+		fprintf(2, "time must be positive\n");
+		exit(1);
+	}
+
+	int time = atoi(argv[1]);
+	sleep(time);
+	exit(0);
+}