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2013-08-23make dlopen honor the rpath of the main programRich Felker-1/+1
this seems to match what other systems do, and seems useful for programs that have their libraries and plugins stored relative to the executable.
2013-08-23fix mishandling of empty or blank TZ environment variableRich Felker-1/+1
the empty TZ string was matching equal to the initial value of the cached TZ name, thus causing do_tzset never to run and never to initialize the time zone data.
2013-08-23fix regression in dn_expand/reverse dnsRich Felker-1/+1
off-by-one error copying the name components was yielding junk at the beginning and truncating one character at the end (of every component).
2013-08-23fix bugs in $ORIGIN handlingRich Felker-3/+9
1. an occurrence of ${ORIGIN} before $ORIGIN would be ignored due to the strstr logic. (note that rpath contains multiple :-delimited paths to be searched.) 2. data read by readlink was not null-terminated.
2013-08-23use AT_EXECFN, if available, for dynamic linker to identify main programRich Felker-1/+5
fallback to argv[0] as before. unlike argv[0], AT_EXECFN was a valid (but possibly relative) pathname for the new program image at the time the execve syscall was made. as a special case, ignore AT_EXECFN if it begins with "/proc/", in order not to give bogus (and possibly harmful) results when fexecve was used.
2013-08-23add rpath $ORIGIN processing to dynamic linkerRich Felker-3/+59
2013-08-23add recursive rpath support to dynamic linkerRich Felker-12/+13
previously, rpath was only honored for direct dependencies. in other words, if A depends on B and B depends on C, only B's rpath (if any), not A's rpath, was being searched for C. this limitation made rpath-based deployment difficult in the presence of multiple levels of library dependency. at present, $ORIGIN processing in rpath is still unsupported.
2013-08-23fix missing string.h in strftime.c (needed by new strftime code)Rich Felker-0/+1
this bug was masked by local experimental CFLAGS in my config.mak.
2013-08-22fix some documentation typosRich Felker-2/+2
2013-08-22add strftime and wcsftime field widthsRich Felker-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.
2013-08-22simplify strftime and fix integer overflowsRich Felker-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.
2013-08-22strftime cleanup: avoid recomputing strlen when it's knownRich Felker-10/+16
2013-08-22more strftime refactoringRich Felker-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.
2013-08-22begin refactoring strftime to make adding field widths easierRich Felker-151/+161
2013-08-21add SUN_LEN macro to sys/un.h under appropriate feature testsRich Felker-0/+19
this is ugly and useless, but it seems to be the least-ugly way to provide it...
2013-08-21unbreak vwarn: print ": " before errno messageRich Felker-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.
2013-08-20fix two bugs in sed code configure uses to save command lineRich Felker-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.
2013-08-18re-add logic for ignoring failure of ld.so symlink installationRich Felker-1/+1
this was inadvertently removed when switching to the new install.sh.
2013-08-18fix fenv exception functions to mask their argumentSzabolcs Nagy-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
2013-08-18optimize x86 feclearexcept: only use save/restore x87 fenv if neededSzabolcs Nagy-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.
2013-08-18remove the __mxcsr member from fenv_t on i386 to follow the glibc abiSzabolcs Nagy-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.
2013-08-18add sse fenv support on i386 through hwcapSzabolcs Nagy-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)
2013-08-18fix i386 fesetenv: FE_DFL_ENV is (fenv_t*)-1 not 0Szabolcs Nagy-2/+2
2013-08-17remove spurious tmp file present since initial git check-inRich Felker-390/+0
2013-08-17replace system's install command with a shell scriptRich Felker-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.
2013-08-17add hkscs/big5-2003/eten extensions to iconv big5Rich Felker-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.
2013-08-16make configure store its command line in config.mak for easy re-runRich Felker-1/+11
proper shell quoting and pretty-printing (avoiding ugly gratuitous quoting and bad quoting style) is included.
2013-08-16fix atomicity and other issues installing dynamic linker symlinkRich Felker-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.
2013-08-16some initial math asm for armhf (fabs[f] and sqrt[f])Rich Felker-0/+32
2013-08-16fix detection of arm hardfloatRich Felker-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.
2013-08-16support floating point environment (fenv) on armhf (hard float) subarchsRich Felker-0/+75
patch by nsz. I've tested it on an armhf machine and it seems to be working correctly.
2013-08-16fix build of x86_64 expl assemblyRich Felker-1/+1
apparently this label change was not carried over when adapting the changes from the i386 version.
2013-08-15add function types to arm crt assemblyRich Felker-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.
2013-08-15math: fix pow(x,-1) to raise underflow properlySzabolcs Nagy-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)
2013-08-15math: fix i386 atan2.s to raise underflow for subnormal resultsSzabolcs Nagy-2/+24
2013-08-15math: clean up atan2.cSzabolcs Nagy-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)
2013-08-15math: fix x86 asin, atan, exp, log1p to raise underflowSzabolcs Nagy-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
2013-08-15math: fix x86 expl.s to raise underflow and clean up special case handlingSzabolcs Nagy-45/+31
2013-08-15math: fix asin, atan, log1p, tanh to raise underflow on subnormalSzabolcs Nagy-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
2013-08-15math: fix tgamma to raise underflow for large negative valuesSzabolcs Nagy-0/+1
2013-08-15math: fix pow(0,-inf) to raise divbyzero flagSzabolcs Nagy-2/+2
2013-08-15math: minor scalbn*.c simplificationSzabolcs Nagy-18/+10
2013-08-14fix length computation in dn_expandRich Felker-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.
2013-08-14de-duplicate dn_expand, fix return value and signature, clean upRich Felker-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.
2013-08-14add arm-optimized memcpy implementation from bionic libcRich Felker-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.
2013-08-14rework makefile subarch logic to allow shared filesRich Felker-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.
2013-08-14add missing MSG_EXCEPT in sys/msg.hRich Felker-0/+1
2013-08-13provide declarations for strtod_l and familyRich Felker-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.
2013-08-11add subarch asm support for PIC objects/shared libcRich Felker-0/+3
this rule was omitted in previous subarch asm commit
2013-08-11add missing a_or_l to atomic.h for non-x86 archsRich Felker-0/+20
this is needed for recently committed sigaction code