diff --git a/libc/upstream-openbsd/android/include/openbsd-compat.h b/libc/upstream-openbsd/android/include/openbsd-compat.h
index 8e6f87d..cbc52b5 100644
--- a/libc/upstream-openbsd/android/include/openbsd-compat.h
+++ b/libc/upstream-openbsd/android/include/openbsd-compat.h
@@ -42,23 +42,8 @@
 
 #define PROTO_NORMAL(x)
 
-/* OpenBSD's <ctype.h> uses these names, which conflicted with stlport.
- * Additionally, we changed the numeric/digit type from N to D for libcxx.
- */
-#define _U _CTYPE_U
-#define _L _CTYPE_L
-#define _N _CTYPE_D
-#define _S _CTYPE_S
-#define _P _CTYPE_P
-#define _C _CTYPE_C
-#define _X _CTYPE_X
-#define _B _CTYPE_B
-
-/* OpenBSD has this, but we can't really implement it correctly on Linux. */
-#define issetugid() 0
-
 #if !defined(ANDROID_HOST_MUSL)
-#define explicit_bzero(p, s) memset(p, 0, s)
+#define explicit_bzero(p, s) memset_explicit(p, 0, s)
 #endif
 
 #if defined(ANDROID_HOST_MUSL)
diff --git a/libc/upstream-openbsd/lib/libc/crypt/arc4random.c b/libc/upstream-openbsd/lib/libc/crypt/arc4random.c
index 8a4ecc9..0737cf3 100644
--- a/libc/upstream-openbsd/lib/libc/crypt/arc4random.c
+++ b/libc/upstream-openbsd/lib/libc/crypt/arc4random.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random.c,v 1.54 2015/09/13 08:31:47 guenther Exp $	*/
+/*	$OpenBSD: arc4random.c,v 1.58 2022/07/31 13:41:45 tb Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -49,6 +49,8 @@
 #define BLOCKSZ	64
 #define RSBUFSZ	(16*BLOCKSZ)
 
+#define REKEY_BASE	(1024*1024) /* NB. should be a power of 2 */
+
 /* Marked MAP_INHERIT_ZERO, so zero'd out in fork children. */
 static struct _rs {
 	size_t		rs_have;	/* valid bytes at end of rs_buf */
@@ -78,7 +80,7 @@
 			abort();
 	}
 
-	chacha_keysetup(&rsx->rs_chacha, buf, KEYSZ * 8, 0);
+	chacha_keysetup(&rsx->rs_chacha, buf, KEYSZ * 8);
 	chacha_ivsetup(&rsx->rs_chacha, buf + KEYSZ);
 }
 
@@ -86,6 +88,7 @@
 _rs_stir(void)
 {
 	u_char rnd[KEYSZ + IVSZ];
+	uint32_t rekey_fuzz = 0;
 
 	if (getentropy(rnd, sizeof rnd) == -1)
 		_getentropy_fail();
@@ -100,7 +103,10 @@
 	rs->rs_have = 0;
 	memset(rsx->rs_buf, 0, sizeof(rsx->rs_buf));
 
-	rs->rs_count = 1600000;
+	/* rekey interval should not be predictable */
+	chacha_encrypt_bytes(&rsx->rs_chacha, (uint8_t *)&rekey_fuzz,
+	    (uint8_t *)&rekey_fuzz, sizeof(rekey_fuzz));
+	rs->rs_count = REKEY_BASE + (rekey_fuzz % REKEY_BASE);
 }
 
 static inline void
diff --git a/libc/upstream-openbsd/lib/libc/crypt/chacha_private.h b/libc/upstream-openbsd/lib/libc/crypt/chacha_private.h
index 7c3680f..b0427b6 100644
--- a/libc/upstream-openbsd/lib/libc/crypt/chacha_private.h
+++ b/libc/upstream-openbsd/lib/libc/crypt/chacha_private.h
@@ -4,7 +4,7 @@
 Public domain.
 */
 
-/* $OpenBSD: chacha_private.h,v 1.2 2013/10/04 07:02:27 djm Exp $ */
+/* $OpenBSD: chacha_private.h,v 1.3 2022/02/28 21:56:29 dtucker Exp $ */
 
 typedef unsigned char u8;
 typedef unsigned int u32;
@@ -52,7 +52,7 @@
 static const char tau[16] = "expand 16-byte k";
 
 static void
-chacha_keysetup(chacha_ctx *x,const u8 *k,u32 kbits,u32 ivbits)
+chacha_keysetup(chacha_ctx *x,const u8 *k,u32 kbits)
 {
   const char *constants;
 
diff --git a/libc/upstream-openbsd/lib/libc/gen/ctype_.c b/libc/upstream-openbsd/lib/libc/gen/ctype_.c
index 8972244..9742c9f 100644
--- a/libc/upstream-openbsd/lib/libc/gen/ctype_.c
+++ b/libc/upstream-openbsd/lib/libc/gen/ctype_.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ctype_.c,v 1.12 2015/09/19 04:02:21 guenther Exp $ */
+/*	$OpenBSD: ctype_.c,v 1.13 2024/02/04 13:03:18 jca Exp $ */
 /*
  * Copyright (c) 1989 The Regents of the University of California.
  * All rights reserved.
@@ -36,6 +36,16 @@
 #include <ctype.h>
 #include "ctype_private.h"
 
+/* Shorter names for the defines provided by <ctype.h> */
+#define	_U	_CTYPE_U
+#define	_L	_CTYPE_L
+#define	_N	_CTYPE_N
+#define	_S	_CTYPE_S
+#define	_P	_CTYPE_P
+#define	_C	_CTYPE_C
+#define	_X	_CTYPE_X
+#define	_B	_CTYPE_B
+
 const char _C_ctype_[1 + CTYPE_NUM_CHARS] = {
 	0,
 	_C,	_C,	_C,	_C,	_C,	_C,	_C,	_C,
diff --git a/libc/upstream-openbsd/lib/libc/net/htonl.c b/libc/upstream-openbsd/lib/libc/net/htonl.c
index 6ee6e7e..58bfb46 100644
--- a/libc/upstream-openbsd/lib/libc/net/htonl.c
+++ b/libc/upstream-openbsd/lib/libc/net/htonl.c
@@ -1,6 +1,5 @@
-/*	$OpenBSD: htonl.c,v 1.7 2014/07/21 01:51:10 guenther Exp $ */
+/*	$OpenBSD: htonl.c,v 1.8 2024/04/15 14:30:48 naddy Exp $ */
 /*
- * Written by J.T. Conklin <jtc@netbsd.org>.
  * Public domain.
  */
 
@@ -9,13 +8,8 @@
 
 #undef htonl
 
-u_int32_t
-htonl(u_int32_t x)
+uint32_t
+htonl(uint32_t x)
 {
-#if BYTE_ORDER == LITTLE_ENDIAN
-	u_char *s = (u_char *)&x;
-	return (u_int32_t)(s[0] << 24 | s[1] << 16 | s[2] << 8 | s[3]);
-#else
-	return x;
-#endif
+	return htobe32(x);
 }
diff --git a/libc/upstream-openbsd/lib/libc/net/htons.c b/libc/upstream-openbsd/lib/libc/net/htons.c
index f48d91e..28b13ce 100644
--- a/libc/upstream-openbsd/lib/libc/net/htons.c
+++ b/libc/upstream-openbsd/lib/libc/net/htons.c
@@ -1,6 +1,5 @@
-/*	$OpenBSD: htons.c,v 1.9 2014/07/21 01:51:10 guenther Exp $ */
+/*	$OpenBSD: htons.c,v 1.10 2024/04/15 14:30:48 naddy Exp $ */
 /*
- * Written by J.T. Conklin <jtc@netbsd.org>.
  * Public domain.
  */
 
@@ -9,13 +8,8 @@
 
 #undef htons
 
-u_int16_t
-htons(u_int16_t x)
+uint16_t
+htons(uint16_t x)
 {
-#if BYTE_ORDER == LITTLE_ENDIAN
-	u_char *s = (u_char *) &x;
-	return (u_int16_t)(s[0] << 8 | s[1]);
-#else
-	return x;
-#endif
+	return htobe16(x);
 }
diff --git a/libc/upstream-openbsd/lib/libc/net/ntohl.c b/libc/upstream-openbsd/lib/libc/net/ntohl.c
index 0d05bac..7592398 100644
--- a/libc/upstream-openbsd/lib/libc/net/ntohl.c
+++ b/libc/upstream-openbsd/lib/libc/net/ntohl.c
@@ -1,6 +1,5 @@
-/*	$OpenBSD: ntohl.c,v 1.7 2014/07/21 01:51:10 guenther Exp $ */
+/*	$OpenBSD: ntohl.c,v 1.8 2024/04/15 14:30:48 naddy Exp $ */
 /*
- * Written by J.T. Conklin <jtc@netbsd.org>.
  * Public domain.
  */
 
@@ -9,13 +8,8 @@
 
 #undef ntohl
 
-u_int32_t
-ntohl(u_int32_t x)
+uint32_t
+ntohl(uint32_t x)
 {
-#if BYTE_ORDER == LITTLE_ENDIAN
-	u_char *s = (u_char *)&x;
-	return (u_int32_t)(s[0] << 24 | s[1] << 16 | s[2] << 8 | s[3]);
-#else
-	return x;
-#endif
+	return be32toh(x);
 }
diff --git a/libc/upstream-openbsd/lib/libc/net/ntohs.c b/libc/upstream-openbsd/lib/libc/net/ntohs.c
index b5ea361..ef22ea3 100644
--- a/libc/upstream-openbsd/lib/libc/net/ntohs.c
+++ b/libc/upstream-openbsd/lib/libc/net/ntohs.c
@@ -1,6 +1,5 @@
-/*	$OpenBSD: ntohs.c,v 1.9 2014/07/21 01:51:10 guenther Exp $ */
+/*	$OpenBSD: ntohs.c,v 1.10 2024/04/15 14:30:48 naddy Exp $ */
 /*
- * Written by J.T. Conklin <jtc@netbsd.org>.
  * Public domain.
  */
 
@@ -9,13 +8,8 @@
 
 #undef ntohs
 
-u_int16_t
-ntohs(u_int16_t x)
+uint16_t
+ntohs(uint16_t x)
 {
-#if BYTE_ORDER == LITTLE_ENDIAN
-	u_char *s = (u_char *) &x;
-	return (u_int16_t)(s[0] << 8 | s[1]);
-#else
-	return x;
-#endif
+	return be16toh(x);
 }
diff --git a/libc/upstream-openbsd/lib/libc/stdio/fvwrite.c b/libc/upstream-openbsd/lib/libc/stdio/fvwrite.c
index d83de88..d615245 100644
--- a/libc/upstream-openbsd/lib/libc/stdio/fvwrite.c
+++ b/libc/upstream-openbsd/lib/libc/stdio/fvwrite.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: fvwrite.c,v 1.21 2023/10/06 16:41:02 millert Exp $ */
+/*	$OpenBSD: fvwrite.c,v 1.22 2024/04/28 14:28:02 millert Exp $ */
 /*-
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -31,6 +31,7 @@
  * SUCH DAMAGE.
  */
 
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -76,11 +77,12 @@
 	}
 	if (fp->_flags & __SNBF) {
 		/*
-		 * Unbuffered: write up to BUFSIZ bytes at a time.
+		 * Unbuffered: write up to INT_MAX bytes at a time, to not
+		 * truncate the value of len if it is greater than 2^31 bytes.
 		 */
 		do {
 			GETIOV(;);
-			w = (*fp->_write)(fp->_cookie, p, MIN(len, BUFSIZ));
+			w = (*fp->_write)(fp->_cookie, p, MIN(len, INT_MAX));
 			if (w <= 0)
 				goto err;
 			p += w;
@@ -90,7 +92,8 @@
 		/*
 		 * Fully buffered: fill partially full buffer, if any,
 		 * and then flush.  If there is no partial buffer, write
-		 * one _bf._size byte chunk directly (without copying).
+		 * entire payload directly (without copying) up to a
+		 * multiple of the buffer size.
 		 *
 		 * String output is a special case: write as many bytes
 		 * as fit, but pretend we wrote everything.  This makes
@@ -134,7 +137,15 @@
 				if (__sflush(fp))
 					goto err;
 			} else if (len >= (w = fp->_bf._size)) {
-				/* write directly */
+				/*
+				 * Write directly up to INT_MAX or greatest
+				 * multiple of buffer size (whichever is
+				 * smaller), keeping in the memory buffer the
+				 * remaining part of payload that is smaller
+				 * than buffer size.
+				 */
+				if (w != 0)
+					w = MIN(w * (len / w), INT_MAX);
 				w = (*fp->_write)(fp->_cookie, p, w);
 				if (w <= 0)
 					goto err;