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* __assert_fail(): remove _Noreturn, to get proper stacktracesrofl0r2013-01-042-2/+2
| | | | | | | | 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).
* add some new-ish IPPROTO constants that were missingRich Felker2013-01-011-0/+3
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* math: bessel cleanup (jn.c and jnf.c)Szabolcs Nagy2013-01-012-164/+161
| | | | | | | | | | | | | | | | | | | | | | | | 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
* math: bessel cleanup (j1.c and j1f.c)Szabolcs Nagy2013-01-012-187/+138
| | | | | | | | | | | | | | | 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)
* math: bessel cleanup (j0.c and j0f.c)Szabolcs Nagy2013-01-012-203/+161
| | | | | | | | | | | | | 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
* expose [v]asprintf under _BSD_SOURCERich Felker2012-12-281-2/+2
| | | | reported/requested by Strake; simplified from the provided patch
* align EPOLL_* flags with fcntl O_* flag definitions, which vary by archRich Felker2012-12-271-2/+3
| | | | | | | | 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.
* fix alignment logic in strlcpyRich Felker2012-12-261-1/+1
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* add linux extension POLLRDHUP to poll.hRich Felker2012-12-261-0/+1
| | | | | the POLL prefix is in the reserved namespace for poll.h, so no feature test macro checks are needed.
* fix reference to libc struct in static tls init codeRich Felker2012-12-251-1/+1
| | | | | | | 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.
* clean up and fix logic for making mmap fail on invalid/unsupported offsetsRich Felker2012-12-201-3/+7
| | | | | | | | | | | | | | | | | | | | 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.
* merge a few fixes by sh4rm4Rich Felker2012-12-195-1/+34
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| * socket.h: add SO_(SND/RCV)BUFFORCE to generic blockrofl0r2012-12-191-0/+2
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| * add inet_network (required for wine)rofl0r2012-12-192-0/+12
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| * x86_64/bits/signal.h: fix typo in REG_CSGSFSrofl0r2012-12-191-1/+1
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| * link.h: expose glibc/svr4 dynlinker debugging gluerofl0r2012-12-191-0/+19
| | | | | | | | | | | | this is already implemented in the dynliker (see struct debug), but was not exposed. we need it to do so to make wine happy...
* | math: more correct tgmath.h type cast logicSzabolcs Nagy2012-12-191-32/+17
| | | | | | | | | | | | | | __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
* | math: new type cast logic in tgmath.hSzabolcs Nagy2012-12-191-25/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 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
* | math: use 0x1p-120f and 0x1p120f for tiny and huge valuesSzabolcs Nagy2012-12-1610-27/+27
| | | | | | | | | | | | | | | | | | | | 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)
* | math: tgammal.c fixesSzabolcs Nagy2012-12-161-28/+23
| | | | | | | | | | | | | | | | | | 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
* | math: tanh.c cleanup similar to sinh, coshSzabolcs Nagy2012-12-163-173/+83
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* | math: sinh.c cleanup similar to the cosh oneSzabolcs Nagy2012-12-163-171/+72
| | | | | | | | comments are kept in the double version of the function
* | math: finished cosh.c cleanupSzabolcs Nagy2012-12-163-142/+49
|/ | | | | | | | | | | | | | | | | 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.
* math: x86_64 version of expl, fixed some comments in the i386 versionSzabolcs Nagy2012-12-164-4/+112
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* math: move x86_64 exp2l implementation to exp2l.s from expl.sSzabolcs Nagy2012-12-163-85/+76
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* fix breakage in ldd (failure to print library load address)Rich Felker2012-12-151-2/+2
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* Merge remote-tracking branch 'nsz/math'Rich Felker2012-12-1535-907/+803
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| * math: fix i386/expl.s with more precise x*log2eSzabolcs Nagy2012-12-142-7/+107
| | | | | | | | | | | | | | | | | | 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
| * fixed tgmath.h for functions with integral resultSzabolcs Nagy2012-12-141-7/+9
| | | | | | | | | | | | | | 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
| * math: add a non-dummy tgamma implementationSzabolcs Nagy2012-12-122-20/+215
| | | | | | | | | | | | | | | | | | | | | | | | 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.
| * math: cosh cleanupSzabolcs Nagy2012-12-123-70/+63
| | | | | | | | do fabs by hand, don't check for nan and inf separately
| * math: fix comment in __rem_pio2f.cSzabolcs Nagy2012-12-121-2/+2
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| * math: add empty __invtrigl.s to i386 and x86_64Szabolcs Nagy2012-12-122-0/+0
| | | | | | | | | | __invtrigl is not needed when acosl, asinl, atanl have asm implementations
| * math: clean up inverse trigonometric functionsSzabolcs Nagy2012-12-1112-377/+258
| | | | | | | | | | | | | | | | | | | | | | | | | | 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
| * math: rewrite inverse hyperbolic functions to be simpler/smallerSzabolcs Nagy2012-12-119-406/+149
| | | | | | | | | | | | | | | | | | | | | | | | 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]
| * math: remove long double version of bessel functions from math.hSzabolcs Nagy2012-12-111-8/+0
| | | | | | | | | | | | | | 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.
| * make CMPLX macros available in complex.h in non-c11 mode as wellSzabolcs Nagy2012-12-112-10/+0
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* | add some missing macros to sys/shm.hRich Felker2012-12-151-0/+3
| | | | | | | | | | these are not specified in the standard, but in the reserved namespace, so there is no problem with defining them unconditionally.
* | add missing flags in sys/timerfd.hRich Felker2012-12-131-0/+6
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* | treat invalid C as an error even if warnings aren't enabled.Rich Felker2012-12-111-1/+11
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* fix double errno-decoding in the old-kernel fallback path of pipe2Rich Felker2012-12-111-1/+1
| | | | | this bug seems to have caused any failure by pipe2 on such systems to set errno to 1, rather than the proper error code.
* fix regressions in app compatibility from previous sys/ipc.h changesRich Felker2012-12-101-0/+5
| | | | | | | | | | | | 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.
* document self-synchronized destruction issue for stdio lockingRich Felker2012-12-101-0/+10
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* syscall() declaration belongs in unistd.h, not sys/syscall.hRich Felker2012-12-102-10/+1
| | | | | | | 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.
* add support for ctors/dtors on arm with modern gccRich Felker2012-12-072-4/+40
| | | | | | | | | | | 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.
* page-align initial brk value used by malloc in shared libcRich Felker2012-12-071-1/+5
| | | | | | | | | | 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.
* remove __arch_prctl alias for arch_prctlRich Felker2012-12-071-3/+1
| | | | | | | 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.
* move new linux syscall wrapper functions to proper source dirRich Felker2012-12-072-0/+0
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* fix trailing whitespace issues that crept in here and thereRich Felker2012-12-075-13/+13
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* fix invalid read in aligned_allocRich Felker2012-12-061-2/+3
| | | | | | 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.
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