first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

sys/src/lib/stdio/tmpnam.c

@@ -0,0 +1,29 @@
+/*
+ * This file is part of the UCB release of Plan 9. It is subject to the license
+ * terms in the LICENSE file found in the top-level directory of this
+ * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
+ * part of the UCB release of Plan 9, including this file, may be copied,
+ * modified, propagated, or distributed except according to the terms contained
+ * in the LICENSE file.
+ */
+
+/*
+ * pANS stdio -- tmpnam
+ */
+#include "iolib.h"
+
+char *tmpnam(char *s){
+	static char name[]="/tmp/tn000000000000";
+	char *p;
+	do{
+		p=name+7;
+		while(*p=='9') *p++='0';
+		if(*p=='\0') return NULL;
+		++*p;
+	}while(access(name, 0)==0);
+	if(s){
+		strcpy(s, name);
+		return s;
+	}
+	return name;
+}