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* add strftime and wcsftime field widthsRich Felker2013-08-222-24/+81
| | | | | | | | | at present, since POSIX requires %F to behave as %+4Y-%m-%d and ISO C requires %F to behave as %Y-%m-%d, the default behavior for %Y has been changed to match %+4Y. this seems to be the only way to conform to the requirements of both standards, and it does not affect years prior to the year 10000. depending on the outcome of interpretations from the standards bodies, this may be adjusted at some point.
* simplify strftime and fix integer overflowsRich Felker2013-08-221-28/+12
| | | | | | | | | | use a long long value so that even with offsets, values cannot overflow. instead of using different format strings for different numeric formats, simply use a per-format width and %0*lld for all of them. this width specifier is not for use with strftime field widths; that will be a separate step in the caller.
* strftime cleanup: avoid recomputing strlen when it's knownRich Felker2013-08-221-10/+16
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* more strftime refactoringRich Felker2013-08-221-23/+25
| | | | | | | make __strftime_fmt_1 return a string (possibly in the caller-provided temp buffer) rather than writing into the output buffer. this approach makes more sense when padding to a minimum field width might be required, and it's also closer to what wcsftime wants.
* begin refactoring strftime to make adding field widths easierRich Felker2013-08-221-151/+161
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* add SUN_LEN macro to sys/un.h under appropriate feature testsRich Felker2013-08-211-0/+19
| | | | | this is ugly and useless, but it seems to be the least-ugly way to provide it...
* unbreak vwarn: print ": " before errno messageRich Felker2013-08-211-2/+5
| | | | | patch by Strake. this seems to be a regression caused by fixing the behavior of perror("") to match perror(0) at some point in the past.
* fix two bugs in sed code configure uses to save command lineRich Felker2013-08-201-1/+1
| | | | | | | one place where semicolon (non-portable) was still used in place of separate -e options (copied over from an old version of this code), and use of a literal slash in the bracket expression for the final command, despite slash being used as the delimiter for the s command.
* re-add logic for ignoring failure of ld.so symlink installationRich Felker2013-08-181-1/+1
| | | | this was inadvertently removed when switching to the new install.sh.
* fix fenv exception functions to mask their argumentSzabolcs Nagy2013-08-188-18/+55
| | | | | | | | | | | fesetround.c is a wrapper to do the arch independent argument check (on archs where rounding mode is not stored in 2 bits __fesetround still has to check its arguments) on powerpc fe*except functions do not accept the extra invalid flags of its fpscr register the useless FENV_ACCESS pragma was removed from feupdateenv
* optimize x86 feclearexcept: only use save/restore x87 fenv if neededSzabolcs Nagy2013-08-182-27/+38
| | | | | | | the x87 exception summary (ES) and stack fault (SF) flags may be spuriously cleared by feclearexcept using the fnclex instruction, but these flags are not observable through libc hence maintaining their state is not critical.
* remove the __mxcsr member from fenv_t on i386 to follow the glibc abiSzabolcs Nagy2013-08-181-1/+0
| | | | | | in the previous commit sse fenv support was added, but there is no need to save mxcsr (sse fenv register) so fix the abi incompatibility with glibc.
* add sse fenv support on i386 through hwcapSzabolcs Nagy2013-08-182-9/+61
| | | | | | | the sse and x87 rounding modes should be always the same, the visible exception flags are the bitwise or of the two fenv states (so it's enough to query the rounding mode or raise exceptions on one fenv)
* fix i386 fesetenv: FE_DFL_ENV is (fenv_t*)-1 not 0Szabolcs Nagy2013-08-181-2/+2
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* remove spurious tmp file present since initial git check-inRich Felker2013-08-171-390/+0
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* replace system's install command with a shell scriptRich Felker2013-08-172-7/+72
| | | | | | | | | | | | | | | the historical (non-standardized) install command is really inappropriate for installing binaries/libraries on a system that utilizes memory-mapped executable files. rather than replacing an existing file atomically, it overwrites the existing file. this can cause running programs to see a partially-modified version of the file, resulting in unpredictable behavior, or SIGBUS. a MAP_COPY mode for mmap would get around this problem, but Linux lacks MAP_COPY. the shell script added with this commit works around the problem by writing temporary files and moving them into place. unlike the historical install utility, it also support a -l option for installing a symbolic link atomically, via the same method.
* add hkscs/big5-2003/eten extensions to iconv big5Rich Felker2013-08-173-977/+1433
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | with these changes, the character set implemented as "big5" in musl is a pure superset of cp950, the canonical "big5", and agrees with the normative parts of Unicode. this means it has minor differences from both hkscs and big5-2003: - the range A2CC-A2CE maps to CJK ideographs rather than numerals, contrary to changes made in big5-2003. - C6CD maps to a CJK ideograph rather than its corresponding Kangxi radical character, contrary to changes made in hkscs. - F9FE maps to U+2593 rather than U+FFED. of these differences, none but the last are visually distinct, and the last is a character used purely for text-based graphics, not to convey linguistic content. should there be future demand for strict conformance to big5-2003 or hkscs mappings, the present charset aliases can be replaced with distinct variants. reportedly there are other non-standard big5 extensions in common use in Taiwan and perhaps elsewhere, which could also be added as layers on top of the existing big5 support. there may be additional characters which should be added to the hkscs table: the whatwg standard for big5 defines what appears to be a superset of hkscs.
* make configure store its command line in config.mak for easy re-runRich Felker2013-08-161-1/+11
| | | | | proper shell quoting and pretty-printing (avoiding ugly gratuitous quoting and bad quoting style) is included.
* fix atomicity and other issues installing dynamic linker symlinkRich Felker2013-08-161-5/+3
| | | | | | | | | | | | | | ln -sf is non-atomic; it unlinks the destination first. instead, make a temporary link and rename it into place. this commit also fixes some of the dependency tracking behavior for the link. depending on the directory it's to be installed in is not reasonable; it causes a new link to be attempted if the library directory has been modified, but does not attempt to make a new link just because libc has been updated. instead, depend on the target to be linked to. this will ensure that, if prefix has changed but syslibdir has not, the link will be updated to point to the new prefix.
* some initial math asm for armhf (fabs[f] and sqrt[f])Rich Felker2013-08-1612-0/+32
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* fix detection of arm hardfloatRich Felker2013-08-162-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | it turns out that __SOFTFP__ does not indicate the ABI in use but rather that fpu instructions are not to be used at all. this is specified in ARM's documentation so I'm unclear on how I previously got the wrong idea. unfortunately, this resulted in the 0.9.12 release producing a dynamic linker with the wrong name. fortunately, there do not yet seem to be any public toolchain builds using the wrong name. the __ARM_PCS_VFP macro does not seem to be official from ARM, and in fact it was missing from the very earliest gcc versions (around 4.5.x) that added -mfloat-abi=hard. it would be possible on such versions to perform some ugly linker-based tests instead in hopes that the linker will reject ABI-mismatching object files, if there is demand for supporting such versions. I would probably prefer to document which versions are broken and warn users to manually add -D__ARM_PCS_VFP if using such a version. there's definitely an argument to be made that the fenv macros should be exposed even in -mfloat-abi=softfp mode. for now, I have chosen not to expose them in this case, since the math library will not necessarily have the capability to raise exceptions (it depends on the CFLAGS used to compile it), and since exceptions are officially excluded from the ARM EABI, which the plain "arm" arch aims to follow.
* support floating point environment (fenv) on armhf (hard float) subarchsRich Felker2013-08-164-0/+75
| | | | | patch by nsz. I've tested it on an armhf machine and it seems to be working correctly.
* fix build of x86_64 expl assemblyRich Felker2013-08-161-1/+1
| | | | | apparently this label change was not carried over when adapting the changes from the i386 version.
* add function types to arm crt assemblyRich Felker2013-08-153-0/+4
| | | | | | | | | without these, calls may be resolved incorrectly if the calling code has been compiled to thumb instead of arm. it's not clear to me at this point whether crt_arch.h is even working if crt1.c is built as thumb; this needs testing. but the _init and _fini issues were known to cause crashes in static-linked apps when libc was built as thumb, and this commit should fix that issue.
* math: fix pow(x,-1) to raise underflow properlySzabolcs Nagy2013-08-151-2/+14
| | | | | | if FLT_EVAL_METHOD!=0 check if (double)(1/x) is subnormal and not a power of 2 (if 1/x is power of 2 then either it is exact or the long double to double rounding already raised inexact and underflow)
* math: fix i386 atan2.s to raise underflow for subnormal resultsSzabolcs Nagy2013-08-152-2/+24
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* math: clean up atan2.cSzabolcs Nagy2013-08-154-103/+73
| | | | | | | | | * remove volatile hacks * don't care about inexact flag for now (removed all the +-tiny) * fix atanl to raise underflow properly * remove signed int arithmetics * use pi/2 instead of pi_o_2 (gcc generates the same code, which is not correct, but it does not matter: we mainly care about nearest rounding)
* math: fix x86 asin, atan, exp, log1p to raise underflowSzabolcs Nagy2013-08-156-3/+98
| | | | | | underflow is raised by an inexact subnormal float store, since subnormal operations are slow, check the underflow flag and skip the store if it's already raised
* math: fix x86 expl.s to raise underflow and clean up special case handlingSzabolcs Nagy2013-08-152-45/+31
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* math: fix asin, atan, log1p, tanh to raise underflow on subnormalSzabolcs Nagy2013-08-159-26/+39
| | | | | | | | | | | | | | | | | | for these functions f(x)=x for small inputs, because f(0)=0 and f'(0)=1, but for subnormal values they should raise the underflow flag (required by annex F), if they are approximated by a polynomial around 0 then spurious underflow should be avoided (not required by annex F) all these functions should raise inexact flag for small x if x!=0, but it's not required by the standard and it does not seem a worthy goal, so support for it is removed in some cases. raising underflow: - x*x may not raise underflow for subnormal x if FLT_EVAL_METHOD!=0 - x*x may raise spurious underflow for normal x if FLT_EVAL_METHOD==0 - in case of double subnormal x, store x as float - in case of float subnormal x, store x*x as float
* math: fix tgamma to raise underflow for large negative valuesSzabolcs Nagy2013-08-151-0/+1
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* math: fix pow(0,-inf) to raise divbyzero flagSzabolcs Nagy2013-08-152-2/+2
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* math: minor scalbn*.c simplificationSzabolcs Nagy2013-08-153-18/+10
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* fix length computation in dn_expandRich Felker2013-08-141-3/+5
| | | | | | | there are two possible points where the length is evaluated: either the first 'compression' jump, or the null terminator if no jumps have taken place yet. the previous code only measured the length of the first component.
* de-duplicate dn_expand, fix return value and signature, clean upRich Felker2013-08-143-49/+24
| | | | | | | | | | | | | | | | | the duplicate code in dn_expand and its incorrect return values are both results of the history of the code: the version in __dns.c was originally written with no awareness of the legacy resolver API, and was later copy-and-paste duplicated to provide the legacy API. this commit is the first of a series that will restructure the internal dns code to share as much code as possible with the legacy resolver API functions. I have also removed the loop detection logic, since the output buffer length limit naturally prevents loops. in order to avoid long runtime when encountering a loop if the caller provided a ridiculously long buffer, the caller-provided length is clamped at the maximum dns name length.
* add arm-optimized memcpy implementation from bionic libcRich Felker2013-08-144-0/+387
| | | | | | | | | | | | | | | | | | | | the approach of this implementation was heavily investigated prior to adopting it. attempts to obtain similar performance with pure C code were capping out at about 75% of the performance of the asm, with considerably larger code size, and were fragile in that the compiler would sometimes compile part of memcpy into a call to itself. therefore, just using the asm seems to be the best option. this commit is the first to make use of the new subarch-specific asm framework. the new armel directory is the location for arm asm that should not be used for all arm subarchs, only the default one. armhf is the name of the little-endian hardfloat-ABI subarch, which can use the exact same asm. in both cases, the build system finds the asm by following a memcpy.sub file. the other two subarchs, armeb and armebhf, would need a big-endian variant of this code. it would not be hard to adapt the code to big endian, but I will hold off on doing so until there is demand for it.
* rework makefile subarch logic to allow shared filesRich Felker2013-08-141-4/+12
| | | | | | | | instead of subarchs getting their own .s files which are used directly by the makefile to replace the .c file, they now must provide a .sub file whose contents are a pathname, relative to the location of the .sub file, which will substitute for the .c file. essentially these files are acting as symbolic links, but implemented as text files.
* add missing MSG_EXCEPT in sys/msg.hRich Felker2013-08-141-0/+1
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* provide declarations for strtod_l and familyRich Felker2013-08-131-0/+4
| | | | | | | | these aliases were originally intended to be for ABI compatibility only, but their presence caused regressions in broken gnulib-based software whose configure scripts detect the existing of these functions then use them without declarations, resulting in bogus return values.
* add subarch asm support for PIC objects/shared libcRich Felker2013-08-111-0/+3
| | | | this rule was omitted in previous subarch asm commit
* add missing a_or_l to atomic.h for non-x86 archsRich Felker2013-08-114-0/+20
| | | | this is needed for recently committed sigaction code
* allow subarch-specific asm, including asm specific to the defaultRich Felker2013-08-112-0/+9
| | | | | | | | | | | | | the default subarch is the one whose full name is just the base arch name, with no suffixes. normally, either the asm in the default subarch is suitable for all subarch variants, or separate asm is mandatory for each variant. however, in the case of asm which is purely for optimization purposes, it's possible to have asm that only works (or only performs well) on the default subarch, and not any othe the other variants. thus, I have added a mechanism to give a name to the default variant, for example "armel" for the default, little-endian arm. further such default-subarch names can be added in the future as needed.
* fix _NSIG and SIGRTMAX on mipsRich Felker2013-08-102-2/+4
| | | | | | | | | | | | | | | | | | | | | a mips signal mask contains 128 bits, enough for signals 1 through 128. however, the exit status obtained from the wait-family functions only has room for values up to 127. reportedly signal 128 was causing kernelspace bugs, so it was removed from the kernel recently; even without that issue, however, it was impossible to support it correctly in userspace. at the same time, the bug was masked on musl by SIGRTMAX incorrectly yielding 64 on mips, rather than the "correct" value of 128. now that the _NSIG issue is fixed, SIGRTMAX can be fixed at the same time, exposing the full range of signals for application use. note that the (nonstandardized) libc _NSIG value is actually one greater than the max signal number, and also one greater than the kernel headers' idea of _NSIG. this is the reason for the discrepency with the recent kernel changes. since reducing _NSIG by one brought it down from 129 to 128, rather than from 128 to 127, _NSIG/8, used widely in the musl sources, is unchanged.
* fix definitions of WIFSTOPPED and WIFSIGNALED to support up to signal 127Rich Felker2013-08-102-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | mips has signal numbers up to 127 (formerly, up to 128, but the last one never worked right and caused kernel panic when used), so 127 in the "signal number" field of the wait status is insufficient for determining that the process was stopped. in addition, a nonzero value in the upper bits must be present, indicating the signal number which caused the process to be stopped. details on this issue can be seen in the email with message id CAAG0J9-d4BfEhbQovFqUAJ3QoOuXScrpsY1y95PrEPxA5DWedQ@mail.gmail.com on the linux-mips mailing list, archived at: http://www.linux-mips.org/archives/linux-mips/2013-06/msg00552.html and in the associated thread about fixing the mips kernel bug. commit 4a96b948687166da26a6c327e6c6733ad2336c5c fixed the corresponding issue in uClibc, but introduced a multiple-evaluation issue for the WIFSTOPPED macro. for the most part, none of these issues affected pure musl systems, since musl has up until now (incorrectly) defined SIGRTMAX as 64 on all archs, even mips. however, interpreting status of non-musl programs on mips may have caused problems. with this change, the full range of signal numbers can be made available on mips.
* add pthread_setaffinity_np and pthread_getaffinity_np functionsRich Felker2013-08-104-18/+29
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* add cpu affinity interfacesRich Felker2013-08-104-0/+90
| | | | | | | this first commit just includes the CPU_* and sched_* interfaces, not the pthread_* interfaces, which may be added later. simple sanity-check testing has been done for the basic interfaces, but most of the macros have not yet been tested.
* change sigset_t functions to restrict to _NSIGRich Felker2013-08-094-5/+5
| | | | | | | the idea here is to avoid advertising signals that don't exist and to make these functions safe to call (e.g. from within other parts of the implementation) on fake sigset_t objects which do not have the HURD padding.
* optimize posix_spawn to avoid spurious sigaction syscallsRich Felker2013-08-093-12/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | the trick here is that sigaction can track for us which signals have ever had a signal handler set for them, and only those signals need to be considered for reset. this tracking mask may have false positives, since it is impossible to remove bits from it without race conditions. false negatives are not possible since the mask is updated with atomic operations prior to making the sigaction syscall. implementation-internal signals are set to SIG_IGN rather than SIG_DFL so that a signal raised in the parent (e.g. calling pthread_cancel on the thread executing pthread_spawn) does not have any chance make it to the child, where it would cause spurious termination by signal. this change reduces the minimum/typical number of syscalls in the child from around 70 to 4 (including execve). this should greatly improve the performance of posix_spawn and other interfaces which use it (popen and system). to facilitate these changes, sigismember is also changed to return 0 rather than -1 for invalid signals, and to return the actual status of implementation-internal signals. POSIX allows but does not require an error on invalid signal numbers, and in fact returning an error tends to confuse applications which wrongly assume the return value of sigismember is boolean.
* fix missing errno from exec failure in posix_spawnRich Felker2013-08-091-0/+1
| | | | | failures prior to the exec attempt were reported correctly, but on exec failure, the return value contained junk.
* block all signals, even implementation-internal ones, in faccessat childRich Felker2013-08-091-1/+1
| | | | | | the child process's stack may be insufficient size to support a signal frame, and there is no reason these signal handlers should run in the child anyway.