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Szabolcs Nagy [Fri, 11 Jan 2013 01:00:14 +0000 (02:00 +0100)]
add missing EHWPOISON to bits/errno.h
it was already defined for mips, but was missing from other archs
Szabolcs Nagy [Fri, 11 Jan 2013 00:58:54 +0000 (01:58 +0100)]
add missing ptrace requests and options to sys/ptrace.h
Szabolcs Nagy [Fri, 11 Jan 2013 00:54:53 +0000 (01:54 +0100)]
add missing multicast socket options to netinet/in.h
based on linux headers add the missing MCAST_* options
under _GNU_SOURCE as they are not in the reserved namespace
(this api was originally specified by RFC 3678)
Szabolcs Nagy [Fri, 11 Jan 2013 00:46:09 +0000 (01:46 +0100)]
add missing protocol families to sys/socket.h
missing protocol families based on current linux headers:
PF_RDS, PF_LLC, PF_CAN, PF_TIPC, PF_NFC
Rich Felker [Thu, 10 Jan 2013 22:57:30 +0000 (17:57 -0500)]
fix another case of cloexec/nonblock flags not matching arch values
Rich Felker [Thu, 10 Jan 2013 19:05:40 +0000 (14:05 -0500)]
check for invalid handles in dlsym/dlclose
this is wasteful and useless from a standpoint of sane programs, but
it is required by the standard, and the current requirements were
upheld with the closure of Austin Group issue #639:
http://austingroupbugs.net/view.php?id=639
rofl0r [Fri, 4 Jan 2013 17:47:17 +0000 (18:47 +0100)]
setjmp.h: add struct tag for sigjmp_buf (GCC C++ compatibility)
the anonymous struct typedef with array notation breaks with
GCC in C++ mode:
error: non-local function 'static<anonymous struct>
(& boost::signal_handler::jump_buffer())[1]' uses anonymous type
this is a known GCC issue, as search results for that error msg
suggest.
since this is hard to work around in the calling C++ code, a
fix in musl is preferable.
rofl0r [Fri, 4 Jan 2013 12:05:42 +0000 (13:05 +0100)]
add legacy header values.h
some programs (procps, babl) expect it, and it doesn't seem to
cause any harm to just add it.
it's small and straightforward.
since math.h also defines MAXFLOAT, we undef it in both places,
before defining it.
rofl0r [Fri, 4 Jan 2013 11:57:15 +0000 (12:57 +0100)]
time.h: add BSD aliases for otherwise internal struct tm members
rofl0r [Tue, 1 Jan 2013 07:07:26 +0000 (08:07 +0100)]
wait.h: add linux specific, thread-related waitpid() flags
these flags are needed in order to be able to handle lwp id's
which the kernel returns after clone() calls for new threads
via ptrace(PTRACE_GETEVENTMSG).
fortunately, they're the same for all archs and in the reserved
namespace.
rofl0r [Tue, 1 Jan 2013 06:59:11 +0000 (07:59 +0100)]
__assert_fail(): remove _Noreturn, to get proper stacktraces
for _Noreturn functions, gcc generates code that trashes the
stack frame, and so it makes it impossible to inspect the causes
of an assert error in gdb.
abort() is not affected (i have not yet investigated why).
Rich Felker [Wed, 2 Jan 2013 01:19:20 +0000 (20:19 -0500)]
add some new-ish IPPROTO constants that were missing
Szabolcs Nagy [Tue, 1 Jan 2013 21:20:45 +0000 (22:20 +0100)]
math: bessel cleanup (jn.c and jnf.c)
both jn and yn functions had integer overflow issues for large
and small n
to handle these issues nm1 (== |n|-1) is used instead of n and -n
in the code and some loops are changed to make sure the iteration
counter does not overflow
(another solution could be to use larger integer type or even double
but that has more size and runtime cost, on x87 loading int64_t or
even uint32_t into an fpu register is more than two times slower than
loading int32_t, and using double for n slows down iteration logic)
yn(-1,0) now returns inf
posix2008 specifies that on overflow and at +-0 all y0,y1,yn functions
return -inf, this is not consistent with math when n<0 odd integer in yn
(eg. when x->0, yn(-1,x)->inf, but historically yn(-1,0) seems to be
special cased and returned -inf)
some threshold values in jnf and ynf were fixed that seems to be
incorrectly copy-pasted from the double version
Szabolcs Nagy [Tue, 1 Jan 2013 21:11:28 +0000 (22:11 +0100)]
math: bessel cleanup (j1.c and j1f.c)
a common code path in j1 and y1 was factored out so the resulting
object code is a bit smaller
unsigned int arithmetics is used for bit manipulation
j1(-inf) now returns 0 instead of -0
an incorrect threshold in the common code of j1f and y1f got fixed
(this caused spurious overflow and underflow exceptions)
the else branch in pone and pzero functions are fixed
(so code analyzers dont warn about uninitialized values)
Szabolcs Nagy [Tue, 1 Jan 2013 20:59:46 +0000 (21:59 +0100)]
math: bessel cleanup (j0.c and j0f.c)
a common code path in j0 and y0 was factored out so the resulting
object code is smaller
unsigned int arithmetics is used for bit manipulation
the logic of j0 got a bit simplified (x < 1 case was handled
separately with a bit higher precision than now, but there are large
errors in other domains anyway so that branch has been removed)
some threshold values were adjusted in j0f and y0f
Rich Felker [Fri, 28 Dec 2012 20:39:33 +0000 (15:39 -0500)]
expose [v]asprintf under _BSD_SOURCE
reported/requested by Strake; simplified from the provided patch
Rich Felker [Fri, 28 Dec 2012 01:44:44 +0000 (20:44 -0500)]
align EPOLL_* flags with fcntl O_* flag definitions, which vary by arch
the old definitions were wrong on some archs. actually, EPOLL_NONBLOCK
probably should not even be defined; it is not accepted by the kernel
and it's not clear to me whether it has any use at all, even if it did
work. this issue should be revisited at some point, but I'm leaving it
in place for now in case some applications reference it.
Rich Felker [Thu, 27 Dec 2012 04:48:02 +0000 (23:48 -0500)]
fix alignment logic in strlcpy
Rich Felker [Wed, 26 Dec 2012 21:55:49 +0000 (16:55 -0500)]
add linux extension POLLRDHUP to poll.h
the POLL prefix is in the reserved namespace for poll.h, so no feature
test macro checks are needed.
Rich Felker [Wed, 26 Dec 2012 02:51:11 +0000 (21:51 -0500)]
fix reference to libc struct in static tls init code
libc is the macro, __libc is the internal symbol, but under some
configurations on old/broken compilers, the symbol might not actually
exist and the libc macro might instead use __libc_loc() to obtain
access to the object.
Rich Felker [Thu, 20 Dec 2012 17:16:02 +0000 (12:16 -0500)]
clean up and fix logic for making mmap fail on invalid/unsupported offsets
the previous logic was assuming the kernel would give EINVAL when
passed an invalid address, but instead with MAP_FIXED it was giving
EPERM, as it considered this an attempt to map over kernel memory.
instead of trying to get the kernel to do the rigth thing, the new
code just handles the error in userspace.
I have also cleaned up the code to use a single mask to check for
invalid low bits and unsupported high bits, so it's simpler and more
clearly correct. the old code was actually wrong for sizeof(long)
smaller than sizeof(off_t) but not equal to 4; now it should be
correct for all possibilities.
for 64-bit systems, the low-bits test is new and extraneous (the
kernel should catch the error anyway when the mmap2 syscall is not
used), but it's cheap anyway. if this is an issue, the OFF_MASK
definition could be tweaked to omit the low bits when SYS_mmap2 is not
defined.
Rich Felker [Wed, 19 Dec 2012 18:07:37 +0000 (13:07 -0500)]
merge a few fixes by sh4rm4
rofl0r [Wed, 19 Dec 2012 18:02:22 +0000 (19:02 +0100)]
socket.h: add SO_(SND/RCV)BUFFORCE to generic block
Szabolcs Nagy [Wed, 19 Dec 2012 09:57:54 +0000 (10:57 +0100)]
math: more correct tgmath.h type cast logic
__IS_FP is a portable integer constant expression now
(uses that unsigned long long is larger than float)
the result casting logic should work now on all compilers
supporting typeof
rofl0r [Wed, 19 Dec 2012 06:32:38 +0000 (07:32 +0100)]
add inet_network (required for wine)
rofl0r [Wed, 19 Dec 2012 05:09:57 +0000 (06:09 +0100)]
x86_64/bits/signal.h: fix typo in REG_CSGSFS
rofl0r [Wed, 19 Dec 2012 04:08:07 +0000 (05:08 +0100)]
link.h: expose glibc/svr4 dynlinker debugging glue
this is already implemented in the dynliker (see struct debug),
but was not exposed.
we need it to do so to make wine happy...
Szabolcs Nagy [Wed, 19 Dec 2012 03:05:30 +0000 (04:05 +0100)]
math: new type cast logic in tgmath.h
* return type logic is simplified a bit and fixed (see below)
* return type of conj and cproj were wrong on int arguments
* added comments about the pending issues
(usually we don't have comments in public headers but this is
not the biggest issue with tgmath.h)
casting the result to the right type cannot be done in c99
(c11 _Generic can solve this but that is not widely supported),
so the typeof extension of gcc is used and that the ?: operator
has special semantics when one of the operands is a null
pointer constant
the standard is very strict about the definition of null
pointer constants so typeof with ?: is still not enough so
compiler specific workaround is used for now
on gcc '!1.0' is a null pointer constant so we can use the old
__IS_FP logic (eventhough it's non-standard)
on clang (and on gcc as well) 'sizeof(void)-1' is a null
pointer constant so we can use
!(sizeof(*(0?(int*)0:(void*)__IS_FP(x)))-1)
(this is non-standard as well), the old logic is used by
default and this new one on clang
Szabolcs Nagy [Sun, 16 Dec 2012 19:28:43 +0000 (20:28 +0100)]
math: use 0x1p-120f and 0x1p120f for tiny and huge values
previously 0x1p-1000 and 0x1p1000 was used for raising inexact
exception like x+tiny (when x is big) or x+huge (when x is small)
the rational is that these float consts are large enough
(0x1p-120 + 1 raises inexact even on ld128 which has 113 mant bits)
and float consts maybe smaller or easier to load on some platforms
(on i386 this reduced the object file size by 4bytes in some cases)
Szabolcs Nagy [Sun, 16 Dec 2012 19:22:17 +0000 (20:22 +0100)]
math: tgammal.c fixes
this is not a full rewrite just fixes to the special case logic:
+-0 and non-integer x<INT_MIN inputs incorrectly raised invalid
exception and for +-0 the return value was wrong
so integer test and odd/even test for negative inputs are changed
and a useless overflow test was removed
Szabolcs Nagy [Sun, 16 Dec 2012 18:52:42 +0000 (19:52 +0100)]
math: tanh.c cleanup similar to sinh, cosh
comments are kept in the double version of the function
compared to fdlibm/freebsd we partition the domain into one
more part and select different threshold points:
now the [log(5/3)/2,log(3)/2] and [log(3)/2,inf] domains
should have <1.5ulp error
(so only the last bit may be wrong, assuming good exp, expm1)
(note that log(3)/2 and log(5/3)/2 are the points where tanh
changes resolution: tanh(log(3)/2)=0.5, tanh(log(5/3)/2)=0.25)
for some x < log(5/3)/2 (~=0.2554) the error can be >1.5ulp
but it should be <2ulp
(the freebsd code had some >2ulp errors in [0.255,1])
even with the extra logic the new code produces smaller
object files
Szabolcs Nagy [Sun, 16 Dec 2012 18:49:55 +0000 (19:49 +0100)]
math: sinh.c cleanup similar to the cosh one
comments are kept in the double version of the function
Szabolcs Nagy [Sun, 16 Dec 2012 18:23:51 +0000 (19:23 +0100)]
math: finished cosh.c cleanup
changed the algorithm: large input is not special cased
(when exp(-x) is small compared to exp(x))
and the threshold values are reevaluated
(fdlibm code had a log(2)/2 cutoff for which i could not find
justification, log(2) seems to be a better threshold and this
was verified empirically)
the new code is simpler, makes smaller binaries and should be
faster for common cases
the old comments were removed as they are no longer true for the
new algorithm and the fdlibm copyright was dropped as well
because there is no common code or idea with the original anymore
except for trivial ones.
Szabolcs Nagy [Sun, 16 Dec 2012 16:30:29 +0000 (17:30 +0100)]
math: x86_64 version of expl, fixed some comments in the i386 version
Szabolcs Nagy [Sun, 16 Dec 2012 16:28:18 +0000 (17:28 +0100)]
math: move x86_64 exp2l implementation to exp2l.s from expl.s
Rich Felker [Sun, 16 Dec 2012 04:34:08 +0000 (23:34 -0500)]
fix breakage in ldd (failure to print library load address)
Rich Felker [Sat, 15 Dec 2012 05:49:09 +0000 (00:49 -0500)]
Merge remote-tracking branch 'nsz/math'
Rich Felker [Sat, 15 Dec 2012 05:43:27 +0000 (00:43 -0500)]
add some missing macros to sys/shm.h
these are not specified in the standard, but in the reserved
namespace, so there is no problem with defining them unconditionally.
Szabolcs Nagy [Fri, 14 Dec 2012 17:29:56 +0000 (18:29 +0100)]
math: fix i386/expl.s with more precise x*log2e
with naive exp2l(x*log2e) the last 12bits of the result was incorrect
for x with large absolute value
with hi + lo = x*log2e is caluclated to 128 bits precision and then
expl(x) = exp2l(hi) + exp2l(hi) * f2xm1(lo)
this gives <1.5ulp measured error everywhere in nearest rounding mode
Szabolcs Nagy [Fri, 14 Dec 2012 11:49:35 +0000 (12:49 +0100)]
fixed tgmath.h for functions with integral result
in tgmath.h the return values are casted to the appropriate
floating-point type (if the compiler supports gcc __typeof__),
this is wrong in case of ilogb, lrint, llrint, lround, llround
which do not need such cast
Rich Felker [Thu, 13 Dec 2012 19:15:11 +0000 (14:15 -0500)]
add missing flags in sys/timerfd.h
Rich Felker [Wed, 12 Dec 2012 04:28:31 +0000 (23:28 -0500)]
treat invalid C as an error even if warnings aren't enabled.
Szabolcs Nagy [Wed, 12 Dec 2012 00:43:43 +0000 (01:43 +0100)]
math: add a non-dummy tgamma implementation
uses the lanczos approximation method with the usual tweaks.
same parameters were selected as in boost and python.
(avoides some extra work and special casing found in boost
so the precision is not that good: measured error is <5ulp for
positive x and <10ulp for negative)
an alternative lgamma_r implementation is also given in the same
file which is simpler and smaller than the current one, but less
precise so it's ifdefed out for now.
Szabolcs Nagy [Wed, 12 Dec 2012 00:39:23 +0000 (01:39 +0100)]
math: cosh cleanup
do fabs by hand, don't check for nan and inf separately
Szabolcs Nagy [Wed, 12 Dec 2012 00:28:22 +0000 (01:28 +0100)]
math: fix comment in __rem_pio2f.c
Szabolcs Nagy [Tue, 11 Dec 2012 23:16:32 +0000 (00:16 +0100)]
math: add empty __invtrigl.s to i386 and x86_64
__invtrigl is not needed when acosl, asinl, atanl have asm
implementations
Szabolcs Nagy [Tue, 11 Dec 2012 22:56:59 +0000 (23:56 +0100)]
math: clean up inverse trigonometric functions
modifications:
* avoid unsigned->signed conversions
* removed various volatile hacks
* use FORCE_EVAL when evaluating only for side-effects
* factor out R() rational approximation instead of manual inline
* __invtrigl.h now only provides __invtrigl_R, __pio2_hi and __pio2_lo
* use 2*pio2_hi, 2*pio2_lo instead of pi_hi, pi_lo
otherwise the logic is not changed, long double versions will
need a revisit when a genaral long double cleanup happens
Szabolcs Nagy [Tue, 11 Dec 2012 22:06:20 +0000 (23:06 +0100)]
math: rewrite inverse hyperbolic functions to be simpler/smaller
modifications:
* avoid unsigned->signed integer conversion
* do not handle special cases when they work correctly anyway
* more strict threshold values (0x1p26 instead of 0x1p28 etc)
* smaller code, cleaner branching logic
* same precision as the old code:
acosh(x) has up to 2ulp error in [1,1.125]
asinh(x) has up to 1.6ulp error in [0.125,0.5], [-0.5,-0.125]
atanh(x) has up to 1.7ulp error in [0.125,0.5], [-0.5,-0.125]
Szabolcs Nagy [Tue, 11 Dec 2012 21:57:39 +0000 (22:57 +0100)]
math: remove long double version of bessel functions from math.h
j0l,j1l,jnl,y0l,j1l,jnl are gnu extensions, bsd and posix do not
have them.
noone seems to use them and there is no plan to implement them any
time soon so we shouldn't declare them in math.h.
Szabolcs Nagy [Tue, 11 Dec 2012 21:44:36 +0000 (22:44 +0100)]
make CMPLX macros available in complex.h in non-c11 mode as well
Rich Felker [Tue, 11 Dec 2012 14:38:38 +0000 (09:38 -0500)]
fix double errno-decoding in the old-kernel fallback path of pipe2
this bug seems to have caused any failure by pipe2 on such systems to
set errno to 1, rather than the proper error code.
Rich Felker [Tue, 11 Dec 2012 02:36:12 +0000 (21:36 -0500)]
fix regressions in app compatibility from previous sys/ipc.h changes
despite glibc using __key and __seq rather than key and seq, some
applications, notably busybox, assume the names are key and seq unless
glibc is being used. and the names key and seq are really the ones
that _should_ be exposed when not attempting to present a
standards-conforming namespace; apps should not be using names that
begin with double-underscore. thus, the optimal fix is to use key and
seq as the actual names of the members when in bsd/gnu source profile,
and define macros for __key and __seq that redirect to plain key and
seq.
Rich Felker [Mon, 10 Dec 2012 23:31:39 +0000 (18:31 -0500)]
document self-synchronized destruction issue for stdio locking
Rich Felker [Mon, 10 Dec 2012 21:40:45 +0000 (16:40 -0500)]
syscall() declaration belongs in unistd.h, not sys/syscall.h
traditionally, both BSD and GNU systems have it this way.
sys/syscall.h is purely syscall number macros. presently glibc exposes
the syscall declaration in unistd.h only with _GNU_SOURCE, but that
does not reflect historical practice.
Rich Felker [Sat, 8 Dec 2012 04:04:49 +0000 (23:04 -0500)]
add support for ctors/dtors on arm with modern gcc
a while back, gcc switched from using the old _init/_fini fragments
method for calling ctors and dtors on arm to the __init_array and
__fini_array method. unfortunately, on glibc this depends on ugly
hacks involving making libc.so a linker script and pulling parts of
libc into the main program binary. so I cheat a little bit, and just
write asm to iterate over the init/fini arrays from the _init/_fini
asm. the same approach could be used on any arch it's needed on, but
for now arm is the only one.
Rich Felker [Sat, 8 Dec 2012 03:33:11 +0000 (22:33 -0500)]
page-align initial brk value used by malloc in shared libc
this change fixes an obscure issue with some nonstandard kernels,
where the initial brk syscall returns a pointer just past the end of
bss rather than the beginning of a new page. in that case, the dynamic
linker has already reclaimed the space between the end of bss and the
page end for use by malloc, and memory corruption (allocating the same
memory twice) will occur when malloc again claims it on the first call
to brk.
Rich Felker [Fri, 7 Dec 2012 21:22:13 +0000 (16:22 -0500)]
remove __arch_prctl alias for arch_prctl
if there's evidence of any use for it, we can add it back later. as
far as I can tell, glibc has it only for internal use (and musl uses a
direct syscall in that case rather than a function call), not for
exposing it to applications.
Rich Felker [Fri, 7 Dec 2012 21:17:16 +0000 (16:17 -0500)]
move new linux syscall wrapper functions to proper source dir
Rich Felker [Fri, 7 Dec 2012 21:16:44 +0000 (16:16 -0500)]
fix trailing whitespace issues that crept in here and there
Rich Felker [Fri, 7 Dec 2012 02:12:28 +0000 (21:12 -0500)]
fix invalid read in aligned_alloc
in case of mmap-obtained chunks, end points past the end of the
mapping and reading it may fault. since the value is not needed until
after the conditional, move the access to prevent invalid reads.
Rich Felker [Thu, 6 Dec 2012 22:05:19 +0000 (17:05 -0500)]
move signal.h REG_* macros under _GNU_SOURCE protection
they were accidentally exposed under just baseline POSIX, which is a
big namespace pollution issue. thankfully glibc only exposes them
under _GNU_SOURCE, not under any of its other options, so omitting
the pollution in the default _BSD_SOURCE profile does not hurt
application compatibility at all.
Rich Felker [Thu, 6 Dec 2012 21:52:09 +0000 (16:52 -0500)]
fix names of ipc_perm __key/__seq elements
previously the names were exposed as key/seq with _GNU_SOURCE and
__ipc_perm_key/__ipc_perm/seq otherwise, whereas glibc always uses
__key and __seq for the names. thus, the old behavior never matched
glibc, and the new behavior always does, regardless of feature test
macros.
for now, i'm leaving the renaming here in sys/ipc.h where it's easy to
change globally for all archs, in case something turns out to be
wrong, but eventually the names could just be incorporated directly
into the bits headers for each arch and the renaming removed.
rofl0r [Thu, 6 Dec 2012 21:48:46 +0000 (22:48 +0100)]
fix sigorset/sigandset: _NSIG/8 is the size in bytes
rofl0r [Thu, 6 Dec 2012 21:45:56 +0000 (22:45 +0100)]
fix F_DUPFD_CLOEXEC being defined twice
rofl0r [Thu, 6 Dec 2012 21:14:37 +0000 (22:14 +0100)]
sigandset/sigorset: do not check for NULL pointers.
that way it's consistent with existing sig* functions, and saves
some code size.
rofl0r [Thu, 6 Dec 2012 20:50:37 +0000 (21:50 +0100)]
fixup sigandset
rofl0r [Thu, 6 Dec 2012 20:43:00 +0000 (21:43 +0100)]
fixup for fcntl.h changes
rofl0r [Thu, 6 Dec 2012 20:07:19 +0000 (21:07 +0100)]
add arch_prctl syscall (amd64/x32 only)
rofl0r [Thu, 6 Dec 2012 20:01:06 +0000 (21:01 +0100)]
add personality syscall
rofl0r [Thu, 6 Dec 2012 19:51:32 +0000 (20:51 +0100)]
add sigandset and sigorset (needed for qemu)
rofl0r [Thu, 6 Dec 2012 19:03:04 +0000 (20:03 +0100)]
add struct msgbuf to sys/msg.h
rofl0r [Thu, 6 Dec 2012 18:48:14 +0000 (19:48 +0100)]
unistd.h: fix wrong type for gid_t argument
the prototype is defined with const gid_t* rather than const gid_t[].
it was already correctly defined in grp.h.
rofl0r [Thu, 6 Dec 2012 18:39:52 +0000 (19:39 +0100)]
ipc.h: fix gnu aliases for key and seq in struct ipc_perm
the macro was the wrong way round, additionally GNU defines
__ prefixed versions, which are used by qemu.
rofl0r [Thu, 6 Dec 2012 18:29:38 +0000 (19:29 +0100)]
add obsolete futimesat()
this function is obsolete, however it's available as a syscall
and as such qemu userspace emulation tries to forward it to the
host kernel.
rofl0r [Thu, 6 Dec 2012 17:14:45 +0000 (18:14 +0100)]
bits/signal.h: add register names for x86(_64)
glibc exposes them from ucontext.h.
since that header includes signal.h, it is safe to put them
into bits/signal.h, if _GNU_SOURCE is defined.
rofl0r [Thu, 6 Dec 2012 16:48:11 +0000 (17:48 +0100)]
fcntl.h: add some linux-specific F_ macros
thankfully these are all generic across archs.
the DN_ macros are for usage with F_NOTIFY.
rofl0r [Thu, 6 Dec 2012 16:02:19 +0000 (17:02 +0100)]
tcp.h: add SOL_TCP, analoguous to udp.h
rofl0r [Thu, 6 Dec 2012 15:57:22 +0000 (16:57 +0100)]
add more arch-specific MAP_ macros to bits/mman.h
these are also needed by qemu.
rofl0r [Thu, 6 Dec 2012 00:24:03 +0000 (01:24 +0100)]
remove MAP_32 from non-x86 archs
both kernel and glibc define it only on x86(_64).
rofl0r [Thu, 6 Dec 2012 00:20:48 +0000 (01:20 +0100)]
add MAP_NORESERVE to bits/mman.h
this is needed for qemu, and since it differs for each arch
it can't be circumvented easily by using a macro in CFLAGS.
Rich Felker [Thu, 6 Dec 2012 00:13:47 +0000 (19:13 -0500)]
remove fenv saving/loading code from setjmp/longjmp on arm
the issue is identical to the recent commit fixing the mips versions:
despite other implementations doing this, it conflicts with the
requirements of ISO C and it's a waste of time and code size.
Rich Felker [Wed, 5 Dec 2012 19:12:57 +0000 (14:12 -0500)]
fix inefficiency of math.h isless, etc. macros
previously, everything was going through an intermediate conversion to
long double, which caused the extern __fpclassifyl function to get
invoked, preventing virtually all optimizations of these operations.
with the new code, tests on constant float or double arguments compile
to a constant 0 or 1, and tests on non-constant expressions are
efficient. I may later add support for __builtin versions on compilers
that support them.
Rich Felker [Wed, 5 Dec 2012 17:52:40 +0000 (12:52 -0500)]
remove mips setjmp/longjmp code to save/restore fenv
nothing in the standard requires or even allows the fenv state to be
restored by longjmp. restoring the exception flags is not such a big
deal since it's probably valid to clobber them completely, but
restoring the rounding mode yields an observable side effect not
sanctioned by ISO C. saving/restoring it also wastes a few cycles and
16 bytes of code.
as for historical behavior, reportedly SGI IRIX did save/restore fenv,
and this is where glibc and uClibc got the behavior from. a few other
systems save/restore it too (on archs other than mips), even though
this is apparently wrong. further details are documented here:
http://www-personal.umich.edu/~williams/archive/computation/setjmp-fpmode.html
as musl aims for standards conformance rather than coddling historical
programs expecting non-conforming behavior, and as it's unlikely that
any historical programs actually depend on the incorrect behavior
(such programs would break on other archs, anyway), I'm making the
change not to save/restore fenv on mips.
Rich Felker [Wed, 5 Dec 2012 17:35:24 +0000 (12:35 -0500)]
add scsi headers scsi.h and sg.h
due to some historical oddity, these are considered libc headers
rather than kernel headers. the kernel used to provide them too, but
it seems modern kernels do not install them, so let's just do the
easiest thing and provide them. stripped-down versions provided by
John Spencer.
Rich Felker [Wed, 5 Dec 2012 05:00:42 +0000 (00:00 -0500)]
use __builtin_offsetof to implement offsetof when possible
apparently recent gcc versions have intentionally broken the
traditional definition by treating it as a non-constant expression.
the traditional definition may also be problematic for c++ programs.
Rich Felker [Wed, 5 Dec 2012 00:03:42 +0000 (19:03 -0500)]
use alternate argument syntax for restrict with lio_listio
for some reason I have not been able to determine, gcc 3.2 rejects the
array notation. this seems to be a gcc bug, but since it's easy to
work around, let's do the workaround and avoid gratuitously requiring
newer compilers.
Rich Felker [Tue, 4 Dec 2012 14:32:45 +0000 (09:32 -0500)]
fix regression in arm user.h that happened during big user.h changes
Rich Felker [Mon, 3 Dec 2012 22:02:56 +0000 (17:02 -0500)]
add _ALL_SOURCE as an alias for _GNU_SOURCE/enable-everything
reportedly this is a semi-common practice among some BSDs and a few
other systems, and will improve application compatibility.
Rich Felker [Mon, 3 Dec 2012 21:57:01 +0000 (16:57 -0500)]
feature test macros: make _GNU_SOURCE enable everything
previously, a few BSD features were enabled only by _BSD_SOURCE, not
by _GNU_SOURCE. since _BSD_SOURCE is default in the absence of other
feature test macros, this made adding _GNU_SOURCE to a project not a
purely additive feature test macro; it actually caused some features
to be suppressed.
most of the changes made by this patch actually bring musl in closer
alignment with the glibc behavior for _GNU_SOURCE. the only exceptions
are the added visibility of functions like strlcpy which were BSD-only
due to being disliked/rejected by glibc maintainers. here, I feel the
consistency of having _GNU_SOURCE mean "everything", and especially
the property of it being purely additive, are more valuable than
hiding functions which glibc does not have.
Rich Felker [Sun, 2 Dec 2012 20:18:05 +0000 (15:18 -0500)]
fix a couple issues in the inttypes.h PRI/SCN macros
most importantly, the format/scan macros for the [u]int_fast16_t and
[u]int_fast32_t types were defined incorrectly assuming these types
would match the native word/pointer size. this is incorrect on any
64-bit system; the "fast" types for 16- and 32-bit integers are simply
int.
another issue which was "only a warning" (despite being UB) is that
the choice of "l" versus "ll" was incorrect for 64-bit types on 64-bit
machines. while it would "work" to always use "long long" for 64-bit
types, we use "long" on 64-bit machines to match what glibc does and
what the ABI documents recommend. the macro definitions were probably
right in very old versions of musl, but became wrong when we aligned
most closely with the 'standard' ABI. checking UINTPTR_MAX is an easy
way to get the system wordsize without pulling in new headers.
finally, the useless __PRIPTR macro to allow the underlying type of
[u]intptr_t to vary has been removed. we are using "long" on all
targets, and thankfully this matches what glibc does, so I do not
envision ever needing to change it. thus, the "l" has just been
incorporated directly in the strings.
Rich Felker [Sat, 1 Dec 2012 02:00:18 +0000 (21:00 -0500)]
provide NSIG under _BSD_SOURCE (default) as well as _GNU_SOURCE
this fixes a regression related to the changes made to bits/signal.h
between 0.9.7 and 0.9.8 that broke some (non-portable) software.
Rich Felker [Fri, 30 Nov 2012 22:56:23 +0000 (17:56 -0500)]
fix ordering of shared library ctors with respect to libc init
previously, shared library constructors were being called before
important internal things like the environment (extern char **environ)
and hwcap flags (needed for sjlj to work right with float on arm) were
initialized in __libc_start_main. rather than trying to have to
dynamic linker make sure this stuff all gets initialized right, I've
opted to just defer calling shared library constructors until after
the main program's entry point is reached. this also fixes the order
of ctors to be the exact reverse of dtors, which is a desirable
property and possibly even mandated by some languages.
the main practical effect of this change is that shared libraries
calling getenv from ctors will no longer fail.
Rich Felker [Tue, 27 Nov 2012 14:44:30 +0000 (09:44 -0500)]
fix some restrict-qualifier mismatches in newly added interfaces
these should have little/no practical impact but they're needed for
strict conformance.
Rich Felker [Tue, 27 Nov 2012 02:01:30 +0000 (21:01 -0500)]
update readme and release notes for 0.9.8
Rich Felker [Tue, 27 Nov 2012 01:42:20 +0000 (20:42 -0500)]
remove stat member aliases from ppc-specific bits/stat.h
if these are to be supported, they belong in the main stat.h, not
repeated for each arch.
Rich Felker [Mon, 26 Nov 2012 18:00:58 +0000 (13:00 -0500)]
fix eventfd and inotify nonblock/cloexec flags to match arch values
Rich Felker [Mon, 26 Nov 2012 17:05:33 +0000 (12:05 -0500)]
fix missing limits when only _BSD_SOURCE is defined
the missing check did not affect the default profile, since it has
both _XOPEN_SOURCE and _BSD_SOURCE defined, but it did break programs
which explicitly define _BSD_SOURCE, causing it to be the only feature
test macro present.
Rich Felker [Mon, 26 Nov 2012 04:04:23 +0000 (23:04 -0500)]
fixup mcontext stuff to expost gregset_t/fpregset_t as appropriate
Rich Felker [Mon, 26 Nov 2012 03:28:18 +0000 (22:28 -0500)]
make sys/procfs.h mostly work on most archs
these structures are purely for use by trace/debug tools and tools
working with core files. the definition of fpregset_t, which was
previously here, has been removed because it was wrong; fpregset_t
should be the type used in mcontext_t, not the type used in
ptrace/core stuff.
Rich Felker [Mon, 26 Nov 2012 02:12:34 +0000 (21:12 -0500)]
remove microblaze user.h incorrectly copied from arm