path: root/toolchain/musl/patches/001-git-2015-06-16.patch

commit 1b0cdc8700d29ef018bf226d74b2b58b23bce91c
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 07:11:19 2015 +0000

    refactor stdio open file list handling, move it out of global libc struct
    
    functions which open in-memory FILE stream variants all shared a tail
    with __fdopen, adding the FILE structure to stdio's open file list.
    replacing this common tail with a function call reduces code size and
    duplication of logic. the list is also partially encapsulated now.
    
    function signatures were chosen to facilitate tail call optimization
    and reduce the need for additional accessor functions.
    
    with these changes, static linked programs that do not use stdio no
    longer have an open file list at all.

commit f22a9edaf8a6f2ca1d314d18b3785558279a5c03
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 06:18:00 2015 +0000

    byte-based C locale, phase 3: make MB_CUR_MAX variable to activate code
    
    this patch activates the new byte-based C locale (high bytes treated
    as abstract code unit "characters" rather than decoded as multibyte
    characters) by making the value of MB_CUR_MAX depend on the active
    locale. for the C locale, the LC_CTYPE category pointer is null,
    yielding a value of 1. all other locales yield a value of 4.

commit 16f18d036d9a7bf590ee6eb86785c0a9658220b6
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 05:35:31 2015 +0000

    byte-based C locale, phase 2: stdio and iconv (multibyte callers)
    
    this patch adjusts libc components which use the multibyte functions
    internally, and which depend on them operating in a particular
    encoding, to make the appropriate locale changes before calling them
    and restore the calling thread's locale afterwards. activating the
    byte-based C locale without these changes would cause regressions in
    stdio and iconv.
    
    in the case of iconv, the current implementation was simply using the
    multibyte functions as UTF-8 conversions. setting a multibyte UTF-8
    locale for the duration of the iconv operation allows the code to
    continue working.
    
    in the case of stdio, POSIX requires that FILE streams have an
    encoding rule bound at the time of setting wide orientation. as long
    as all locales, including the C locale, used the same encoding,
    treating high bytes as UTF-8, there was no need to store an encoding
    rule as part of the stream's state.
    
    a new locale field in the FILE structure points to the locale that
    should be made active during fgetwc/fputwc/ungetwc on the stream. it
    cannot point to the locale active at the time the stream becomes
    oriented, because this locale could be mutable (the global locale) or
    could be destroyed (locale_t objects produced by newlocale) before the
    stream is closed. instead, a pointer to the static C or C.UTF-8 locale
    object added in commit commit aeeac9ca5490d7d90fe061ab72da446c01ddf746
    is used. this is valid since categories other than LC_CTYPE will not
    affect these functions.

commit 1507ebf837334e9e07cfab1ca1c2e88449069a80
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 04:44:17 2015 +0000

    byte-based C locale, phase 1: multibyte character handling functions
    
    this patch makes the functions which work directly on multibyte
    characters treat the high bytes as individual abstract code units
    rather than as multibyte sequences when MB_CUR_MAX is 1. since
    MB_CUR_MAX is presently defined as a constant 4, all of the new code
    added is dead code, and optimizing compilers' code generation should
    not be affected at all. a future commit will activate the new code.
    
    as abstract code units, bytes 0x80 to 0xff are represented by wchar_t
    values 0xdf80 to 0xdfff, at the end of the surrogates range. this
    ensures that they will never be misinterpreted as Unicode characters,
    and that all wctype functions return false for these "characters"
    without needing locale-specific logic. a high range outside of Unicode
    such as 0x7fffff80 to 0x7fffffff was also considered, but since C11's
    char16_t also needs to be able to represent conversions of these
    bytes, the surrogate range was the natural choice.

commit 38e2f727237230300fea6aff68802db04625fd23
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 04:21:38 2015 +0000

    fix btowc corner case
    
    btowc is required to interpret its argument by conversion to unsigned
    char, unless the argument is equal to EOF. since the conversion to
    produces a non-character value anyway, we can just unconditionally
    convert, for now.

commit ee59c296d56bf26f49f354d6eb32b4b6d4190188
Author: Szabolcs Nagy <nsz@port70.net>
Date:   Wed Jun 3 10:32:14 2015 +0100

    arm: add vdso support
    
    vdso will be available on arm in linux v4.2, the user-space code
    for it is in kernel commit 8512287a8165592466cb9cb347ba94892e9c56a5

commit e3bc22f1eff87b8f029a6ab31f1a269d69e4b053
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 14 01:59:02 2015 +0000

    refactor malloc's expand_heap to share with __simple_malloc
    
    this extends the brk/stack collision protection added to full malloc
    in commit 276904c2f6bde3a31a24ebfa201482601d18b4f9 to also protect the
    __simple_malloc function used in static-linked programs that don't
    reference the free function.
    
    it also extends support for using mmap when brk fails, which full
    malloc got in commit 5446303328adf4b4e36d9fba21848e6feb55fab4, to
    __simple_malloc.
    
    since __simple_malloc may expand the heap by arbitrarily large
    increments, the stack collision detection is enhanced to detect
    interval overlap rather than just proximity of a single address to the
    stack. code size is increased a bit, but this is partly offset by the
    sharing of code between the two malloc implementations, which due to
    linking semantics, both get linked in a program that needs the full
    malloc with realloc/free support.

commit 4ef9b828c1f39553a69e0635ac91f0fcadd6e8c6
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 20:53:02 2015 +0000

    remove cancellation points in stdio
    
    commit 58165923890865a6ac042fafce13f440ee986fd9 added these optional
    cancellation points on the basis that cancellable stdio could be
    useful, to unblock threads stuck on stdio operations that will never
    complete. however, the only way to ensure that cancellation can
    achieve this is to violate the rules for side effects when
    cancellation is acted upon, discarding knowledge of any partial data
    transfer already completed. our implementation exhibited this behavior
    and was thus non-conforming.
    
    in addition to improving correctness, removing these cancellation
    points moderately reduces code size, and should significantly improve
    performance on i386, where sysenter/syscall instructions can be used
    instead of "int $128" for non-cancellable syscalls.

commit 536c6d5a4205e2a3f161f2983ce1e0ac3082187d
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 05:17:16 2015 +0000

    fix idiom for setting stdio stream orientation to wide
    
    the old idiom, f->mode |= f->mode+1, was adapted from the idiom for
    setting byte orientation, f->mode |= f->mode-1, but the adaptation was
    incorrect. unless the stream was alreasdy set byte-oriented, this code
    incremented f->mode each time it was executed, which would eventually
    lead to overflow. it could be fixed by changing it to f->mode |= 1,
    but upcoming changes will require slightly more work at the time of
    wide orientation, so it makes sense to just call fwide. as an
    optimization in the single-character functions, fwide is only called
    if the stream is not already wide-oriented.

commit f8f565df467c13248104223f99abf7f37cef7584
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 04:42:38 2015 +0000

    add printing of null %s arguments as "(null)" in wide printf
    
    this is undefined, but supported in our implementation of the normal
    printf, so for consistency the wide variant should support it too.

commit f9e25d813860d53cd1e9b6145cc63375d2fe2529
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 04:37:27 2015 +0000

    add %m support to wide printf

commit ec634aad91f57479ef17525e33ed446c780a61f4
Author: Rich Felker <dalias@aerifal.cx>
Date:   Thu Jun 11 05:01:04 2015 +0000

    add sh asm for vfork

commit c30cbcb0a646b1f13a22c645616dce624465b883
Author: Rich Felker <dalias@aerifal.cx>
Date:   Wed Jun 10 02:27:40 2015 +0000

    implement arch-generic version of __unmapself
    
    this can be used to put off writing an asm version of __unmapself for
    new archs, or as a permanent solution on archs where it's not
    practical or even possible to run momentarily with no stack.
    
    the concept here is simple: the caller takes a lock on a global shared
    stack and uses it to make the munmap and exit syscalls. the only trick
    is unlocking, which must be done after the thread exits, and this is
    achieved by using the set_tid_address syscall to have the kernel zero
    and futex-wake the lock word as part of the exit syscall.

commit 276904c2f6bde3a31a24ebfa201482601d18b4f9
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 9 20:30:35 2015 +0000

    in malloc, refuse to use brk if it grows into stack
    
    the linux/nommu fdpic ELF loader sets up the brk range to overlap
    entirely with the main thread's stack (but growing from opposite
    ends), so that the resulting failure mode for malloc is not to return
    a null pointer but to start returning pointers to memory that overlaps
    with the caller's stack. needless to say this extremely dangerous and
    makes brk unusable.
    
    since it's non-trivial to detect execution environments that might be
    affected by this kernel bug, and since the severity of the bug makes
    any sort of detection that might yield false-negatives unsafe, we
    instead check the proximity of the brk to the stack pointer each time
    the brk is to be expanded. both the main thread's stack (where the
    real known risk lies) and the calling thread's stack are checked. an
    arbitrary gap distance of 8 MB is imposed, chosen to be larger than
    linux default main-thread stack reservation sizes and larger than any
    reasonable stack configuration on nommu.
    
    the effeciveness of this patch relies on an assumption that the amount
    by which the brk is being grown is smaller than the gap limit, which
    is always true for malloc's use of brk. reliance on this assumption is
    why the check is being done in malloc-specific code and not in __brk.

commit bd1eaceaa3975bd2a2a34e211cff896affaecadf
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 9 20:09:27 2015 +0000

    fix spurious errors from pwd/grp functions when nscd backend is absent
    
    for several pwd/grp functions, the only way the caller can distinguish
    between a successful negative result ("no such user/group") and an
    internal error is by clearing errno before the call and checking errno
    afterwards. the nscd backend support code correctly simulated a
    not-found response on systems where such a backend is not running, but
    failed to restore errno.
    
    this commit also fixed an outdated/incorrect comment.

commit 75ce4503950621b11fcc7f1fd1187dbcf3cde312
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 7 20:55:23 2015 +0000

    fix regression in pre-v7 arm on kernels with kuser helper removed
    
    the arm atomics/TLS runtime selection code is called from
    __set_thread_area and depends on having libc.auxv and __hwcap
    available. commit 71f099cb7db821c51d8f39dfac622c61e54d794c moved the
    first call to __set_thread_area to the top of dynamic linking stage 3,
    before this data is made available, causing the runtime detection code
    to always see __hwcap as zero and thereby select the atomics/TLS
    implementations based on kuser helper.
    
    upcoming work on superh will use similar runtime detection.
    
    ideally this early-init code should be cleanly refactored and shared
    between the dynamic linker and static-linked startup.

commit 32f3c4f70633488550c29a2444f819aafdf345ff
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 7 03:09:16 2015 +0000

    add multiple inclusion guard to locale_impl.h

commit 04b8360adbb6487f61aa0c00e53ec3a90a5a0d29
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 7 02:59:49 2015 +0000

    remove redefinition of MB_CUR_MAX in locale_impl.h
    
    unless/until the byte-based C locale is implemented, defining
    MB_CUR_MAX to 1 in the C locale is wrong. no internal code currently
    uses the MB_CUR_MAX macro, but having it defined inconsistently is
    error-prone. applications get the value from stdlib.h and were
    unaffected.

commit 16bf466532d7328e971012b0731ad493b017ad29
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:53:02 2015 +0000

    make static C and C.UTF-8 locales available outside of newlocale

commit 312eea2ea4f4363fb01b73660c08bfcf43dd3bb4
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:20:30 2015 +0000

    remove another invalid skip of locking in ungetwc

commit 3d7e32d28dc9962e9efc1c317c5b44b5b2df3008
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:16:22 2015 +0000

    add macro version of ctype.h isascii function
    
    presumably internal code (ungetwc and fputwc) was written assuming a
    macro implementation existed; otherwise use of isascii is just a
    pessimization.

commit 7e816a6487932cbb3cb71d94b609e50e81f4e5bf
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:11:17 2015 +0000

    remove invalid skip of locking in ungetwc
    
    aside from being invalid, the early check only optimized the error
    case, and likely pessimized the common case by separating the
    two branches on isascii(c) at opposite ends of the function.

commit 63f4b9f18f3674124d8bcb119739fec85e6da005
Author: Timo Teräs <timo.teras@iki.fi>
Date:   Fri Jun 5 10:39:42 2015 +0300

    fix uselocale((locale_t)0) not to modify locale
    
    commit 68630b55c0c7219fe9df70dc28ffbf9efc8021d8 made the new locale to
    be assigned unconditonally resulting in crashes later on.

--- a/arch/arm/syscall_arch.h
+++ b/arch/arm/syscall_arch.h
@@ -72,3 +72,7 @@ static inline long __syscall6(long n, lo
 	register long r5 __asm__("r5") = f;
 	__asm_syscall("r"(r7), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5));
 }
+
+#define VDSO_USEFUL
+#define VDSO_CGT_SYM "__vdso_clock_gettime"
+#define VDSO_CGT_VER "LINUX_2.6"
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -64,6 +64,7 @@ int   isascii(int);
 int   toascii(int);
 #define _tolower(a) ((a)|0x20)
 #define _toupper(a) ((a)&0x5f)
+#define isascii(a) (0 ? isascii(a) : (unsigned)(a) < 128)
 
 #endif
 
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -76,7 +76,8 @@ size_t wcstombs (char *__restrict, const
 #define EXIT_FAILURE 1
 #define EXIT_SUCCESS 0
 
-#define MB_CUR_MAX ((size_t)+4)
+size_t __ctype_get_mb_cur_max(void);
+#define MB_CUR_MAX (__ctype_get_mb_cur_max())
 
 #define RAND_MAX (0x7fffffff)
 
--- a/src/ctype/__ctype_get_mb_cur_max.c
+++ b/src/ctype/__ctype_get_mb_cur_max.c
@@ -1,6 +1,7 @@
-#include <stddef.h>
+#include <stdlib.h>
+#include "locale_impl.h"
 
 size_t __ctype_get_mb_cur_max()
 {
-	return 4;
+	return MB_CUR_MAX;
 }
--- a/src/ctype/isascii.c
+++ b/src/ctype/isascii.c
@@ -1,4 +1,5 @@
 #include <ctype.h>
+#undef isascii
 
 int isascii(int c)
 {
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -17,8 +17,6 @@ struct __libc {
 	int secure;
 	volatile int threads_minus_1;
 	size_t *auxv;
-	FILE *ofl_head;
-	volatile int ofl_lock[2];
 	size_t tls_size;
 	size_t page_size;
 	struct __locale_struct global_locale;
--- a/src/internal/locale_impl.h
+++ b/src/internal/locale_impl.h
@@ -1,3 +1,6 @@
+#ifndef _LOCALE_IMPL_H
+#define _LOCALE_IMPL_H
+
 #include <locale.h>
 #include <stdlib.h>
 #include "libc.h"
@@ -12,6 +15,10 @@ struct __locale_map {
 	const struct __locale_map *next;
 };
 
+extern const struct __locale_map __c_dot_utf8;
+extern const struct __locale_struct __c_locale;
+extern const struct __locale_struct __c_dot_utf8_locale;
+
 const struct __locale_map *__get_locale(int, const char *);
 const char *__mo_lookup(const void *, size_t, const char *);
 const char *__lctrans(const char *, const struct __locale_map *);
@@ -20,9 +27,14 @@ const char *__lctrans_cur(const char *);
 #define LCTRANS(msg, lc, loc) __lctrans(msg, (loc)->cat[(lc)])
 #define LCTRANS_CUR(msg) __lctrans_cur(msg)
 
+#define C_LOCALE ((locale_t)&__c_locale)
+#define UTF8_LOCALE ((locale_t)&__c_dot_utf8_locale)
+
 #define CURRENT_LOCALE (__pthread_self()->locale)
 
 #define CURRENT_UTF8 (!!__pthread_self()->locale->cat[LC_CTYPE])
 
 #undef MB_CUR_MAX
 #define MB_CUR_MAX (CURRENT_UTF8 ? 4 : 1)
+
+#endif
--- a/src/internal/stdio_impl.h
+++ b/src/internal/stdio_impl.h
@@ -47,6 +47,7 @@ struct _IO_FILE {
 	unsigned char *shend;
 	off_t shlim, shcnt;
 	FILE *prev_locked, *next_locked;
+	struct __locale_struct *locale;
 };
 
 size_t __stdio_read(FILE *, unsigned char *, size_t);
@@ -75,8 +76,9 @@ int __putc_unlocked(int, FILE *);
 FILE *__fdopen(int, const char *);
 int __fmodeflags(const char *);
 
-#define OFLLOCK() LOCK(libc.ofl_lock)
-#define OFLUNLOCK() UNLOCK(libc.ofl_lock)
+FILE *__ofl_add(FILE *f);
+FILE **__ofl_lock(void);
+void __ofl_unlock(void);
 
 #define feof(f) ((f)->flags & F_EOF)
 #define ferror(f) ((f)->flags & F_ERR)
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -1192,6 +1192,17 @@ _Noreturn void __dls3(size_t *sp)
 	char **argv_orig = argv;
 	char **envp = argv+argc+1;
 
+	/* Find aux vector just past environ[] and use it to initialize
+	 * global data that may be needed before we can make syscalls. */
+	__environ = envp;
+	for (i=argc+1; argv[i]; i++);
+	libc.auxv = auxv = (void *)(argv+i+1);
+	decode_vec(auxv, aux, AUX_CNT);
+	__hwcap = aux[AT_HWCAP];
+	libc.page_size = aux[AT_PAGESZ];
+	libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
+		|| aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]);
+
 	/* Setup early thread pointer in builtin_tls for ldso/libc itself to
 	 * use during dynamic linking. If possible it will also serve as the
 	 * thread pointer at runtime. */
@@ -1200,25 +1211,11 @@ _Noreturn void __dls3(size_t *sp)
 		a_crash();
 	}
 
-	/* Find aux vector just past environ[] */
-	for (i=argc+1; argv[i]; i++)
-		if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
-			env_path = argv[i]+16;
-		else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
-			env_preload = argv[i]+11;
-	auxv = (void *)(argv+i+1);
-
-	decode_vec(auxv, aux, AUX_CNT);
-
 	/* Only trust user/env if kernel says we're not suid/sgid */
-	if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
-	  || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
-		env_path = 0;
-		env_preload = 0;
-		libc.secure = 1;
+	if (!libc.secure) {
+		env_path = getenv("LD_LIBRARY_PATH");
+		env_preload = getenv("LD_PRELOAD");
 	}
-	libc.page_size = aux[AT_PAGESZ];
-	libc.auxv = auxv;
 
 	/* If the main program was already loaded by the kernel,
 	 * AT_PHDR will point to some location other than the dynamic
--- /dev/null
+++ b/src/locale/c_locale.c
@@ -0,0 +1,15 @@
+#include "locale_impl.h"
+#include <stdint.h>
+
+static const uint32_t empty_mo[] = { 0x950412de, 0, -1, -1, -1 };
+
+const struct __locale_map __c_dot_utf8 = {
+	.map = empty_mo,
+	.map_size = sizeof empty_mo,
+	.name = "C.UTF-8"
+};
+
+const struct __locale_struct __c_locale = { 0 };
+const struct __locale_struct __c_dot_utf8_locale = {
+	.cat[LC_CTYPE] = &__c_dot_utf8
+};
--- a/src/locale/iconv.c
+++ b/src/locale/iconv.c
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <limits.h>
 #include <stdint.h>
+#include "locale_impl.h"
 
 #define UTF_32BE    0300
 #define UTF_16LE    0301
@@ -165,9 +166,12 @@ size_t iconv(iconv_t cd0, char **restric
 	int err;
 	unsigned char type = map[-1];
 	unsigned char totype = tomap[-1];
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
 	if (!in || !*in || !*inb) return 0;
 
+	*ploc = UTF8_LOCALE;
+
 	for (; *inb; *in+=l, *inb-=l) {
 		c = *(unsigned char *)*in;
 		l = 1;
@@ -431,6 +435,7 @@ size_t iconv(iconv_t cd0, char **restric
 			break;
 		}
 	}
+	*ploc = loc;
 	return x;
 ilseq:
 	err = EILSEQ;
@@ -445,5 +450,6 @@ starved:
 	x = -1;
 end:
 	errno = err;
+	*ploc = loc;
 	return x;
 }
--- a/src/locale/langinfo.c
+++ b/src/locale/langinfo.c
@@ -33,7 +33,8 @@ char *__nl_langinfo_l(nl_item item, loca
 	int idx = item & 65535;
 	const char *str;
 
-	if (item == CODESET) return "UTF-8";
+	if (item == CODESET)
+		return MB_CUR_MAX==1 ? "UTF-8-CODE-UNITS" : "UTF-8";
 	
 	switch (cat) {
 	case LC_NUMERIC:
--- a/src/locale/locale_map.c
+++ b/src/locale/locale_map.c
@@ -24,14 +24,6 @@ static const char envvars[][12] = {
 	"LC_MESSAGES",
 };
 
-static const uint32_t empty_mo[] = { 0x950412de, 0, -1, -1, -1 };
-
-const struct __locale_map __c_dot_utf8 = {
-	.map = empty_mo,
-	.map_size = sizeof empty_mo,
-	.name = "C.UTF-8"
-};
-
 const struct __locale_map *__get_locale(int cat, const char *val)
 {
 	static int lock[2];
@@ -107,8 +99,8 @@ const struct __locale_map *__get_locale(
 	 * sake of being able to do message translations at the
 	 * application level. */
 	if (!new && (new = malloc(sizeof *new))) {
-		new->map = empty_mo;
-		new->map_size = sizeof empty_mo;
+		new->map = __c_dot_utf8.map;
+		new->map_size = __c_dot_utf8.map_size;
 		memcpy(new->name, val, n);
 		new->name[n] = 0;
 		new->next = loc_head;
--- a/src/locale/newlocale.c
+++ b/src/locale/newlocale.c
@@ -3,16 +3,9 @@
 #include "locale_impl.h"
 #include "libc.h"
 
-extern const struct __locale_map __c_dot_utf8;
-
-static const struct __locale_struct c_locale = { 0 };
-static const struct __locale_struct c_dot_utf8_locale = {
-	.cat[LC_CTYPE] = &__c_dot_utf8
-};
-
 int __loc_is_allocated(locale_t loc)
 {
-	return loc && loc != &c_locale && loc != &c_dot_utf8_locale;
+	return loc && loc != C_LOCALE && loc != UTF8_LOCALE;
 }
 
 locale_t __newlocale(int mask, const char *name, locale_t loc)
@@ -44,9 +37,9 @@ locale_t __newlocale(int mask, const cha
 	}
 
 	if (!j)
-		return (locale_t)&c_locale;
-	if (j==1 && tmp.cat[LC_CTYPE]==c_dot_utf8_locale.cat[LC_CTYPE])
-		return (locale_t)&c_dot_utf8_locale;
+		return C_LOCALE;
+	if (j==1 && tmp.cat[LC_CTYPE]==&__c_dot_utf8)
+		return UTF8_LOCALE;
 
 	if ((loc = malloc(sizeof *loc))) *loc = tmp;
 
--- a/src/locale/uselocale.c
+++ b/src/locale/uselocale.c
@@ -8,9 +8,7 @@ locale_t __uselocale(locale_t new)
 	locale_t old = self->locale;
 	locale_t global = &libc.global_locale;
 
-	if (new == LC_GLOBAL_LOCALE) new = global;
-
-	self->locale = new;
+	if (new) self->locale = new == LC_GLOBAL_LOCALE ? global : new;
 
 	return old == global ? LC_GLOBAL_LOCALE : old;
 }
--- /dev/null
+++ b/src/malloc/expand_heap.c
@@ -0,0 +1,72 @@
+#include <limits.h>
+#include <stdint.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include "libc.h"
+#include "syscall.h"
+
+/* This function returns true if the interval [old,new]
+ * intersects the 'len'-sized interval below &libc.auxv
+ * (interpreted as the main-thread stack) or below &b
+ * (the current stack). It is used to defend against
+ * buggy brk implementations that can cross the stack. */
+
+static int traverses_stack_p(uintptr_t old, uintptr_t new)
+{
+	const uintptr_t len = 8<<20;
+	uintptr_t a, b;
+
+	b = (uintptr_t)libc.auxv;
+	a = b > len ? b-len : 0;
+	if (new>a && old<b) return 1;
+
+	b = (uintptr_t)&b;
+	a = b > len ? b-len : 0;
+	if (new>a && old<b) return 1;
+
+	return 0;
+}
+
+void *__mmap(void *, size_t, int, int, int, off_t);
+
+/* Expand the heap in-place if brk can be used, or otherwise via mmap,
+ * using an exponential lower bound on growth by mmap to make
+ * fragmentation asymptotically irrelevant. The size argument is both
+ * an input and an output, since the caller needs to know the size
+ * allocated, which will be larger than requested due to page alignment
+ * and mmap minimum size rules. The caller is responsible for locking
+ * to prevent concurrent calls. */
+
+void *__expand_heap(size_t *pn)
+{
+	static uintptr_t brk;
+	static unsigned mmap_step;
+	size_t n = *pn;
+
+	if (n > SIZE_MAX/2 - PAGE_SIZE) {
+		errno = ENOMEM;
+		return 0;
+	}
+	n += -n & PAGE_SIZE-1;
+
+	if (!brk) {
+		brk = __syscall(SYS_brk, 0);
+		brk += -brk & PAGE_SIZE-1;
+	}
+
+	if (n < SIZE_MAX-brk && !traverses_stack_p(brk, brk+n)
+	    && __syscall(SYS_brk, brk+n)==brk+n) {
+		*pn = n;
+		brk += n;
+		return (void *)(brk-n);
+	}
+
+	size_t min = (size_t)PAGE_SIZE << mmap_step/2;
+	if (n < min) n = min;
+	void *area = __mmap(0, n, PROT_READ|PROT_WRITE,
+		MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+	if (area == MAP_FAILED) return 0;
+	*pn = n;
+	mmap_step++;
+	return area;
+}
--- a/src/malloc/lite_malloc.c
+++ b/src/malloc/lite_malloc.c
@@ -4,43 +4,46 @@
 #include <errno.h>
 #include "libc.h"
 
-uintptr_t __brk(uintptr_t);
-
 #define ALIGN 16
 
+void *__expand_heap(size_t *);
+
 void *__simple_malloc(size_t n)
 {
-	static uintptr_t cur, brk;
-	uintptr_t base, new;
+	static char *cur, *end;
 	static volatile int lock[2];
-	size_t align=1;
+	size_t align=1, pad;
+	void *p;
 
 	if (!n) n++;
-	if (n > SIZE_MAX/2) goto toobig;
-
 	while (align<n && align<ALIGN)
 		align += align;
-	n = n + align - 1 & -align;
 
 	LOCK(lock);
-	if (!cur) cur = brk = __brk(0)+16;
-	base = cur + align-1 & -align;
-	if (n > SIZE_MAX - PAGE_SIZE - base) goto fail;
-	if (base+n > brk) {
-		new = base+n + PAGE_SIZE-1 & -PAGE_SIZE;
-		if (__brk(new) != new) goto fail;
-		brk = new;
-	}
-	cur = base+n;
-	UNLOCK(lock);
 
-	return (void *)base;
+	pad = -(uintptr_t)cur & align-1;
+
+	if (n <= SIZE_MAX/2 + ALIGN) n += pad;
+
+	if (n > end-cur) {
+		size_t m = n;
+		char *new = __expand_heap(&m);
+		if (!new) {
+			UNLOCK(lock);
+			return 0;
+		}
+		if (new != end) {
+			cur = new;
+			n -= pad;
+			pad = 0;
+		}
+		end = new + m;
+	}
 
-fail:
+	p = cur + pad;
+	cur += n;
 	UNLOCK(lock);
-toobig:
-	errno = ENOMEM;
-	return 0;
+	return p;
 }
 
 weak_alias(__simple_malloc, malloc);
--- a/src/malloc/malloc.c
+++ b/src/malloc/malloc.c
@@ -13,7 +13,6 @@
 #define inline inline __attribute__((always_inline))
 #endif
 
-uintptr_t __brk(uintptr_t);
 void *__mmap(void *, size_t, int, int, int, off_t);
 int __munmap(void *, size_t);
 void *__mremap(void *, size_t, size_t, int, ...);
@@ -31,13 +30,9 @@ struct bin {
 };
 
 static struct {
-	uintptr_t brk;
-	size_t *heap;
 	volatile uint64_t binmap;
 	struct bin bins[64];
-	volatile int brk_lock[2];
 	volatile int free_lock[2];
-	unsigned mmap_step;
 } mal;
 
 
@@ -152,69 +147,52 @@ void __dump_heap(int x)
 }
 #endif
 
+void *__expand_heap(size_t *);
+
 static struct chunk *expand_heap(size_t n)
 {
-	static int init;
+	static int heap_lock[2];
+	static void *end;
+	void *p;
 	struct chunk *w;
-	uintptr_t new;
-
-	lock(mal.brk_lock);
 
-	if (!init) {
-		mal.brk = __brk(0);
-#ifdef SHARED
-		mal.brk = mal.brk + PAGE_SIZE-1 & -PAGE_SIZE;
-#endif
-		mal.brk = mal.brk + 2*SIZE_ALIGN-1 & -SIZE_ALIGN;
-		mal.heap = (void *)mal.brk;
-		init = 1;
+	/* The argument n already accounts for the caller's chunk
+	 * overhead needs, but if the heap can't be extended in-place,
+	 * we need room for an extra zero-sized sentinel chunk. */
+	n += SIZE_ALIGN;
+
+	lock(heap_lock);
+
+	p = __expand_heap(&n);
+	if (!p) {
+		unlock(heap_lock);
+		return 0;
 	}
 
-	if (n > SIZE_MAX - mal.brk - 2*PAGE_SIZE) goto fail;
-	new = mal.brk + n + SIZE_ALIGN + PAGE_SIZE - 1 & -PAGE_SIZE;
-	n = new - mal.brk;
-
-	if (__brk(new) != new) {
-		size_t min = (size_t)PAGE_SIZE << mal.mmap_step/2;
-		n += -n & PAGE_SIZE-1;
-		if (n < min) n = min;
-		void *area = __mmap(0, n, PROT_READ|PROT_WRITE,
-			MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
-		if (area == MAP_FAILED) goto fail;
-
-		mal.mmap_step++;
-		area = (char *)area + SIZE_ALIGN - OVERHEAD;
-		w = area;
+	/* If not just expanding existing space, we need to make a
+	 * new sentinel chunk below the allocated space. */
+	if (p != end) {
+		/* Valid/safe because of the prologue increment. */
 		n -= SIZE_ALIGN;
+		p = (char *)p + SIZE_ALIGN;
+		w = MEM_TO_CHUNK(p);
 		w->psize = 0 | C_INUSE;
-		w->csize = n | C_INUSE;
-		w = NEXT_CHUNK(w);
-		w->psize = n | C_INUSE;
-		w->csize = 0 | C_INUSE;
-
-		unlock(mal.brk_lock);
-
-		return area;
 	}
 
-	w = MEM_TO_CHUNK(mal.heap);
-	w->psize = 0 | C_INUSE;
-
-	w = MEM_TO_CHUNK(new);
+	/* Record new heap end and fill in footer. */
+	end = (char *)p + n;
+	w = MEM_TO_CHUNK(end);
 	w->psize = n | C_INUSE;
 	w->csize = 0 | C_INUSE;
 
-	w = MEM_TO_CHUNK(mal.brk);
+	/* Fill in header, which may be new or may be replacing a
+	 * zero-size sentinel header at the old end-of-heap. */
+	w = MEM_TO_CHUNK(p);
 	w->csize = n | C_INUSE;
-	mal.brk = new;
-	
-	unlock(mal.brk_lock);
+
+	unlock(heap_lock);
 
 	return w;
-fail:
-	unlock(mal.brk_lock);
-	errno = ENOMEM;
-	return 0;
 }
 
 static int adjust_size(size_t *n)
--- a/src/multibyte/btowc.c
+++ b/src/multibyte/btowc.c
@@ -1,7 +1,10 @@
 #include <stdio.h>
 #include <wchar.h>
+#include <stdlib.h>
+#include "internal.h"
 
 wint_t btowc(int c)
 {
-	return c<128U ? c : EOF;
+	int b = (unsigned char)c;
+	return b<128U ? b : (MB_CUR_MAX==1 && c!=EOF) ? CODEUNIT(c) : WEOF;
 }
--- a/src/multibyte/internal.h
+++ b/src/multibyte/internal.h
@@ -23,3 +23,10 @@ extern const uint32_t bittab[];
 
 #define SA 0xc2u
 #define SB 0xf4u
+
+/* Arbitrary encoding for representing code units instead of characters. */
+#define CODEUNIT(c) (0xdfff & (signed char)(c))
+#define IS_CODEUNIT(c) ((unsigned)(c)-0xdf80 < 0x80)
+
+/* Get inline definition of MB_CUR_MAX. */
+#include "locale_impl.h"
--- a/src/multibyte/mbrtowc.c
+++ b/src/multibyte/mbrtowc.c
@@ -4,6 +4,7 @@
  * unnecessary.
  */
 
+#include <stdlib.h>
 #include <wchar.h>
 #include <errno.h>
 #include "internal.h"
@@ -27,6 +28,7 @@ size_t mbrtowc(wchar_t *restrict wc, con
 	if (!n) return -2;
 	if (!c) {
 		if (*s < 0x80) return !!(*wc = *s);
+		if (MB_CUR_MAX==1) return (*wc = CODEUNIT(*s)), 1;
 		if (*s-SA > SB-SA) goto ilseq;
 		c = bittab[*s++-SA]; n--;
 	}
--- a/src/multibyte/mbsrtowcs.c
+++ b/src/multibyte/mbsrtowcs.c
@@ -7,6 +7,8 @@
 #include <stdint.h>
 #include <wchar.h>
 #include <errno.h>
+#include <string.h>
+#include <stdlib.h>
 #include "internal.h"
 
 size_t mbsrtowcs(wchar_t *restrict ws, const char **restrict src, size_t wn, mbstate_t *restrict st)
@@ -24,6 +26,23 @@ size_t mbsrtowcs(wchar_t *restrict ws, c
 		}
 	}
 
+	if (MB_CUR_MAX==1) {
+		if (!ws) return strlen((const char *)s);
+		for (;;) {
+			if (!wn) {
+				*src = (const void *)s;
+				return wn0;
+			}
+			if (!*s) break;
+			c = *s++;
+			*ws++ = CODEUNIT(c);
+			wn--;
+		}
+		*ws = 0;
+		*src = 0;
+		return wn0-wn;
+	}
+
 	if (!ws) for (;;) {
 		if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
 			while (!(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
--- a/src/multibyte/mbtowc.c
+++ b/src/multibyte/mbtowc.c
@@ -4,6 +4,7 @@
  * unnecessary.
  */
 
+#include <stdlib.h>
 #include <wchar.h>
 #include <errno.h>
 #include "internal.h"
@@ -19,6 +20,7 @@ int mbtowc(wchar_t *restrict wc, const c
 	if (!wc) wc = &dummy;
 
 	if (*s < 0x80) return !!(*wc = *s);
+	if (MB_CUR_MAX==1) return (*wc = CODEUNIT(*s)), 1;
 	if (*s-SA > SB-SA) goto ilseq;
 	c = bittab[*s++-SA];
 
--- a/src/multibyte/wcrtomb.c
+++ b/src/multibyte/wcrtomb.c
@@ -4,8 +4,10 @@
  * unnecessary.
  */
 
+#include <stdlib.h>
 #include <wchar.h>
 #include <errno.h>
+#include "internal.h"
 
 size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict st)
 {
@@ -13,6 +15,13 @@ size_t wcrtomb(char *restrict s, wchar_t
 	if ((unsigned)wc < 0x80) {
 		*s = wc;
 		return 1;
+	} else if (MB_CUR_MAX == 1) {
+		if (!IS_CODEUNIT(wc)) {
+			errno = EILSEQ;
+			return -1;
+		}
+		*s = wc;
+		return 1;
 	} else if ((unsigned)wc < 0x800) {
 		*s++ = 0xc0 | (wc>>6);
 		*s = 0x80 | (wc&0x3f);
--- a/src/multibyte/wctob.c
+++ b/src/multibyte/wctob.c
@@ -1,8 +1,10 @@
-#include <stdio.h>
 #include <wchar.h>
+#include <stdlib.h>
+#include "internal.h"
 
 int wctob(wint_t c)
 {
 	if (c < 128U) return c;
+	if (MB_CUR_MAX==1 && IS_CODEUNIT(c)) return (unsigned char)c;
 	return EOF;
 }
--- a/src/passwd/nscd_query.c
+++ b/src/passwd/nscd_query.c
@@ -32,6 +32,7 @@ FILE *__nscd_query(int32_t req, const ch
 		},
 		.msg_iovlen = 2
 	};
+	int errno_save = errno;
 
 	*swap = 0;
 retry:
@@ -50,11 +51,14 @@ retry:
 		return f;
 
 	if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
-		/* If there isn't a running nscd we return -1 to indicate that
-		 * that is precisely what happened
-		 */
-		if (errno == EACCES || errno == ECONNREFUSED || errno == ENOENT)
+		/* If there isn't a running nscd we simulate a "not found"
+		 * result and the caller is responsible for calling
+		 * fclose on the (unconnected) socket. The value of
+		 * errno must be left unchanged in this case.  */
+		if (errno == EACCES || errno == ECONNREFUSED || errno == ENOENT) {
+			errno = errno_save;
 			return f;
+		}
 		goto error;
 	}
 
--- /dev/null
+++ b/src/process/sh/vfork.s
@@ -0,0 +1,23 @@
+.global __vfork
+.weak vfork
+.type __vfork,@function
+.type vfork,@function
+__vfork:
+vfork:
+	mov #95, r3
+	add r3, r3
+
+	trapa #16
+	or    r0, r0
+	or    r0, r0
+	or    r0, r0
+	or    r0, r0
+	or    r0, r0
+
+	mov r0, r4
+	mov.l 1f, r0
+2:	braf r0
+	 nop
+	.align 2
+	.hidden __syscall_ret
+1:	.long __syscall_ret@PLT-(2b+4-.)
--- a/src/regex/fnmatch.c
+++ b/src/regex/fnmatch.c
@@ -18,6 +18,7 @@
 #include <stdlib.h>
 #include <wchar.h>
 #include <wctype.h>
+#include "locale_impl.h"
 
 #define END 0
 #define UNMATCHABLE -2
@@ -229,7 +230,7 @@ static int fnmatch_internal(const char *
 	 * On illegal sequences we may get it wrong, but in that case
 	 * we necessarily have a matching failure anyway. */
 	for (s=endstr; s>str && tailcnt; tailcnt--) {
-		if (s[-1] < 128U) s--;
+		if (s[-1] < 128U || MB_CUR_MAX==1) s--;
 		else while ((unsigned char)*--s-0x80U<0x40 && s>str);
 	}
 	if (tailcnt) return FNM_NOMATCH;
--- a/src/stdio/__fdopen.c
+++ b/src/stdio/__fdopen.c
@@ -54,13 +54,7 @@ FILE *__fdopen(int fd, const char *mode)
 	if (!libc.threaded) f->lock = -1;
 
 	/* Add new FILE to open file list */
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
 
 weak_alias(__fdopen, fdopen);
--- a/src/stdio/__stdio_exit.c
+++ b/src/stdio/__stdio_exit.c
@@ -16,8 +16,7 @@ static void close_file(FILE *f)
 void __stdio_exit(void)
 {
 	FILE *f;
-	OFLLOCK();
-	for (f=libc.ofl_head; f; f=f->next) close_file(f);
+	for (f=*__ofl_lock(); f; f=f->next) close_file(f);
 	close_file(__stdin_used);
 	close_file(__stdout_used);
 }
--- a/src/stdio/__stdio_read.c
+++ b/src/stdio/__stdio_read.c
@@ -1,12 +1,5 @@
 #include "stdio_impl.h"
 #include <sys/uio.h>
-#include <pthread.h>
-
-static void cleanup(void *p)
-{
-	FILE *f = p;
-	if (!f->lockcount) __unlockfile(f);
-}
 
 size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
 {
@@ -16,9 +9,7 @@ size_t __stdio_read(FILE *f, unsigned ch
 	};
 	ssize_t cnt;
 
-	pthread_cleanup_push(cleanup, f);
-	cnt = syscall_cp(SYS_readv, f->fd, iov, 2);
-	pthread_cleanup_pop(0);
+	cnt = syscall(SYS_readv, f->fd, iov, 2);
 	if (cnt <= 0) {
 		f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt);
 		return cnt;
--- a/src/stdio/__stdio_write.c
+++ b/src/stdio/__stdio_write.c
@@ -1,12 +1,5 @@
 #include "stdio_impl.h"
 #include <sys/uio.h>
-#include <pthread.h>
-
-static void cleanup(void *p)
-{
-	FILE *f = p;
-	if (!f->lockcount) __unlockfile(f);
-}
 
 size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len)
 {
@@ -19,9 +12,7 @@ size_t __stdio_write(FILE *f, const unsi
 	int iovcnt = 2;
 	ssize_t cnt;
 	for (;;) {
-		pthread_cleanup_push(cleanup, f);
-		cnt = syscall_cp(SYS_writev, f->fd, iov, iovcnt);
-		pthread_cleanup_pop(0);
+		cnt = syscall(SYS_writev, f->fd, iov, iovcnt);
 		if (cnt == rem) {
 			f->wend = f->buf + f->buf_size;
 			f->wpos = f->wbase = f->buf;
@@ -34,11 +25,8 @@ size_t __stdio_write(FILE *f, const unsi
 		}
 		rem -= cnt;
 		if (cnt > iov[0].iov_len) {
-			f->wpos = f->wbase = f->buf;
 			cnt -= iov[0].iov_len;
 			iov++; iovcnt--;
-		} else if (iovcnt == 2) {
-			f->wbase += cnt;
 		}
 		iov[0].iov_base = (char *)iov[0].iov_base + cnt;
 		iov[0].iov_len -= cnt;
--- a/src/stdio/fclose.c
+++ b/src/stdio/fclose.c
@@ -14,11 +14,11 @@ int fclose(FILE *f)
 	__unlist_locked_file(f);
 
 	if (!(perm = f->flags & F_PERM)) {
-		OFLLOCK();
+		FILE **head = __ofl_lock();
 		if (f->prev) f->prev->next = f->next;
 		if (f->next) f->next->prev = f->prev;
-		if (libc.ofl_head == f) libc.ofl_head = f->next;
-		OFLUNLOCK();
+		if (*head == f) *head = f->next;
+		__ofl_unlock();
 	}
 
 	r = fflush(f);
--- a/src/stdio/fflush.c
+++ b/src/stdio/fflush.c
@@ -35,13 +35,12 @@ int fflush(FILE *f)
 
 	r = __stdout_used ? fflush(__stdout_used) : 0;
 
-	OFLLOCK();
-	for (f=libc.ofl_head; f; f=f->next) {
+	for (f=*__ofl_lock(); f; f=f->next) {
 		FLOCK(f);
 		if (f->wpos > f->wbase) r |= __fflush_unlocked(f);
 		FUNLOCK(f);
 	}
-	OFLUNLOCK();
+	__ofl_unlock();
 	
 	return r;
 }
--- a/src/stdio/fgetwc.c
+++ b/src/stdio/fgetwc.c
@@ -1,8 +1,9 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 #include <errno.h>
 
-wint_t __fgetwc_unlocked(FILE *f)
+static wint_t __fgetwc_unlocked_internal(FILE *f)
 {
 	mbstate_t st = { 0 };
 	wchar_t wc;
@@ -10,8 +11,6 @@ wint_t __fgetwc_unlocked(FILE *f)
 	unsigned char b;
 	size_t l;
 
-	f->mode |= f->mode+1;
-
 	/* Convert character from buffer if possible */
 	if (f->rpos < f->rend) {
 		l = mbrtowc(&wc, (void *)f->rpos, f->rend - f->rpos, &st);
@@ -39,6 +38,16 @@ wint_t __fgetwc_unlocked(FILE *f)
 	return wc;
 }
 
+wint_t __fgetwc_unlocked(FILE *f)
+{
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
+	if (f->mode <= 0) fwide(f, 1);
+	*ploc = f->locale;
+	wchar_t wc = __fgetwc_unlocked_internal(f);
+	*ploc = loc;
+	return wc;
+}
+
 wint_t fgetwc(FILE *f)
 {
 	wint_t c;
--- a/src/stdio/fmemopen.c
+++ b/src/stdio/fmemopen.c
@@ -110,11 +110,5 @@ FILE *fmemopen(void *restrict buf, size_
 
 	if (!libc.threaded) f->lock = -1;
 
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
--- a/src/stdio/fopen.c
+++ b/src/stdio/fopen.c
@@ -18,7 +18,7 @@ FILE *fopen(const char *restrict filenam
 	/* Compute the flags to pass to open() */
 	flags = __fmodeflags(mode);
 
-	fd = sys_open_cp(filename, flags, 0666);
+	fd = sys_open(filename, flags, 0666);
 	if (fd < 0) return 0;
 	if (flags & O_CLOEXEC)
 		__syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
--- a/src/stdio/fputwc.c
+++ b/src/stdio/fputwc.c
@@ -1,4 +1,5 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 #include <limits.h>
 #include <ctype.h>
@@ -7,8 +8,10 @@ wint_t __fputwc_unlocked(wchar_t c, FILE
 {
 	char mbc[MB_LEN_MAX];
 	int l;
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
-	f->mode |= f->mode+1;
+	if (f->mode <= 0) fwide(f, 1);
+	*ploc = f->locale;
 
 	if (isascii(c)) {
 		c = putc_unlocked(c, f);
@@ -20,6 +23,8 @@ wint_t __fputwc_unlocked(wchar_t c, FILE
 		l = wctomb(mbc, c);
 		if (l < 0 || __fwritex((void *)mbc, l, f) < l) c = WEOF;
 	}
+	if (c==WEOF) f->flags |= F_ERR;
+	*ploc = loc;
 	return c;
 }
 
--- a/src/stdio/fputws.c
+++ b/src/stdio/fputws.c
@@ -1,23 +1,28 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 
 int fputws(const wchar_t *restrict ws, FILE *restrict f)
 {
 	unsigned char buf[BUFSIZ];
 	size_t l=0;
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
 	FLOCK(f);
 
-	f->mode |= f->mode+1;
+	fwide(f, 1);
+	*ploc = f->locale;
 
 	while (ws && (l = wcsrtombs((void *)buf, (void*)&ws, sizeof buf, 0))+1 > 1)
 		if (__fwritex(buf, l, f) < l) {
 			FUNLOCK(f);
+			*ploc = loc;
 			return -1;
 		}
 
 	FUNLOCK(f);
 
+	*ploc = loc;
 	return l; /* 0 or -1 */
 }
 
--- a/src/stdio/fwide.c
+++ b/src/stdio/fwide.c
@@ -1,13 +1,14 @@
-#include <wchar.h>
 #include "stdio_impl.h"
-
-#define SH (8*sizeof(int)-1)
-#define NORMALIZE(x) ((x)>>SH | -((-(x))>>SH))
+#include "locale_impl.h"
 
 int fwide(FILE *f, int mode)
 {
 	FLOCK(f);
-	if (!f->mode) f->mode = NORMALIZE(mode);
+	if (mode) {
+		if (!f->locale) f->locale = MB_CUR_MAX==1
+			? C_LOCALE : UTF8_LOCALE;
+		if (!f->mode) f->mode = mode>0 ? 1 : -1;
+	}
 	mode = f->mode;
 	FUNLOCK(f);
 	return mode;
--- /dev/null
+++ b/src/stdio/ofl.c
@@ -0,0 +1,16 @@
+#include "stdio_impl.h"
+#include "libc.h"
+
+static FILE *ofl_head;
+static volatile int ofl_lock[2];
+
+FILE **__ofl_lock()
+{
+	LOCK(ofl_lock);
+	return &ofl_head;
+}
+
+void __ofl_unlock()
+{
+	UNLOCK(ofl_lock);
+}
--- /dev/null
+++ b/src/stdio/ofl_add.c
@@ -0,0 +1,11 @@
+#include "stdio_impl.h"
+
+FILE *__ofl_add(FILE *f)
+{
+	FILE **head = __ofl_lock();
+	f->next = *head;
+	if (*head) (*head)->prev = f;
+	*head = f;
+	__ofl_unlock();
+	return f;
+}
--- a/src/stdio/open_memstream.c
+++ b/src/stdio/open_memstream.c
@@ -79,11 +79,5 @@ FILE *open_memstream(char **bufp, size_t
 
 	if (!libc.threaded) f->lock = -1;
 
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
--- a/src/stdio/open_wmemstream.c
+++ b/src/stdio/open_wmemstream.c
@@ -81,11 +81,5 @@ FILE *open_wmemstream(wchar_t **bufp, si
 
 	if (!libc.threaded) f->lock = -1;
 
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
--- a/src/stdio/ungetwc.c
+++ b/src/stdio/ungetwc.c
@@ -1,4 +1,5 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 #include <limits.h>
 #include <ctype.h>
@@ -8,21 +9,19 @@ wint_t ungetwc(wint_t c, FILE *f)
 {
 	unsigned char mbc[MB_LEN_MAX];
 	int l=1;
-
-	if (c == WEOF) return c;
-
-	/* Try conversion early so we can fail without locking if invalid */
-	if (!isascii(c) && (l = wctomb((void *)mbc, c)) < 0)
-		return WEOF;
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
 	FLOCK(f);
 
-	f->mode |= f->mode+1;
+	if (f->mode <= 0) fwide(f, 1);
+	*ploc = f->locale;
 
 	if (!f->rpos) __toread(f);
-	if (!f->rpos || f->rpos < f->buf - UNGET + l) {
+	if (!f->rpos || f->rpos < f->buf - UNGET + l || c == WEOF ||
+	    (!isascii(c) && (l = wctomb((void *)mbc, c)) < 0)) {
 		FUNLOCK(f);
-		return EOF;
+		*ploc = loc;
+		return WEOF;
 	}
 
 	if (isascii(c)) *--f->rpos = c;
@@ -31,5 +30,6 @@ wint_t ungetwc(wint_t c, FILE *f)
 	f->flags &= ~F_EOF;
 
 	FUNLOCK(f);
+	*ploc = loc;
 	return c;
 }
--- a/src/stdio/vfwprintf.c
+++ b/src/stdio/vfwprintf.c
@@ -293,7 +293,10 @@ static int wprintf_core(FILE *f, const w
 			if ((fl&LEFT_ADJ)) fprintf(f, "%.*s", w-p, "");
 			l=w;
 			continue;
+		case 'm':
+			arg.p = strerror(errno);
 		case 's':
+			if (!arg.p) arg.p = "(null)";
 			bs = arg.p;
 			if (p<0) p = INT_MAX;
 			for (i=l=0; l<p && (i=mbtowc(&wc, bs, MB_LEN_MAX))>0; bs+=i, l++);
@@ -356,7 +359,7 @@ int vfwprintf(FILE *restrict f, const wc
 	}
 
 	FLOCK(f);
-	f->mode |= f->mode+1;
+	fwide(f, 1);
 	olderr = f->flags & F_ERR;
 	f->flags &= ~F_ERR;
 	ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type);
--- a/src/stdio/vfwscanf.c
+++ b/src/stdio/vfwscanf.c
@@ -104,7 +104,7 @@ int vfwscanf(FILE *restrict f, const wch
 
 	FLOCK(f);
 
-	f->mode |= f->mode+1;
+	fwide(f, 1);
 
 	for (p=fmt; *p; p++) {
 
--- /dev/null
+++ b/src/thread/__unmapself.c
@@ -0,0 +1,29 @@
+#include "pthread_impl.h"
+#include "atomic.h"
+#include "syscall.h"
+/* cheat and reuse CRTJMP macro from dynlink code */
+#include "dynlink.h"
+
+static volatile int lock;
+static void *unmap_base;
+static size_t unmap_size;
+static char shared_stack[256];
+
+static void do_unmap()
+{
+	__syscall(SYS_munmap, unmap_base, unmap_size);
+	__syscall(SYS_exit);
+}
+
+void __unmapself(void *base, size_t size)
+{
+	int tid=__pthread_self()->tid;
+	char *stack = shared_stack + sizeof shared_stack;
+	stack -= (uintptr_t)stack % 16;
+	while (lock || a_cas(&lock, 0, tid))
+		a_spin();
+	__syscall(SYS_set_tid_address, &lock);
+	unmap_base = base;
+	unmap_size = size;
+	CRTJMP(do_unmap, stack);
+}
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -191,8 +191,9 @@ int __pthread_create(pthread_t *restrict
 	if (!libc.can_do_threads) return ENOSYS;
 	self = __pthread_self();
 	if (!libc.threaded) {
-		for (FILE *f=libc.ofl_head; f; f=f->next)
+		for (FILE *f=*__ofl_lock(); f; f=f->next)
 			init_file_lock(f);
+		__ofl_unlock();
 		init_file_lock(__stdin_used);
 		init_file_lock(__stdout_used);
 		init_file_lock(__stderr_used);