a

kern/sysproc.c

@@ -0,0 +1,32 @@
+#include	"u.h"
+#include	"lib.h"
+#include	"dat.h"
+#include	"fns.h"
+#include	"error.h"
+
+long
+sysexits(ulong *arg)
+{
+	char *status;
+	char *inval = "invalid exit string";
+	char buf[ERRMAX];
+
+	status = (char*)arg[0];
+	if(status){
+		if(waserror())
+			status = inval;
+		else{
+			validaddr((ulong)status, 1, 0);
+			if(vmemchr(status, 0, ERRMAX) == 0){
+				memmove(buf, status, ERRMAX);
+				buf[ERRMAX-1] = 0;
+				status = buf;
+			}
+		}
+		poperror();
+
+	}
+	pexit(status, 1);
+	return 0;		/* not reached */
+}
+