don't exhaust kernel entropy pool

net/nmap/patches/patch-utils.c

@@ -0,0 +1,34 @@
+--- utils.c.orig	Thu Oct  5 01:46:19 2000
++++ utils.c	Sat Nov 18 00:55:54 2000
+@@ -184,6 +184,23 @@
+ return s;
+ }
+ 
++#ifdef __OpenBSD__
++int get_random_bytes(void *buf, int numbytes)
++{
++	u_int32_t i;
++	
++	while (numbytes > 4) {
++		*(u_int32_t *)buf = arc4random();
++		buf += 4;
++		numbytes -= 4;
++	}
++	if (numbytes > 0) {
++		i = arc4random();
++		memcpy(buf, &i, numbytes);
++	}
++	return 0;
++}
++#else
+ int get_random_bytes(void *buf, int numbytes) {
+ static char bytebuf[2048];
+ static char badrandomwarning = 0;
+@@ -239,6 +256,7 @@
+ bytesleft = 0;
+ return get_random_bytes((char *)buf + tmp, numbytes - tmp);
+ }
++#endif /* OpenBSD */
+ 
+ /* Scramble the contents of an array*/
+ void genfry(unsigned char *arr, int elem_sz, int num_elem) {