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2013-02-17consistently use the internal name __environ for environRich Felker-5/+4
patch by Jens Gustedt. previously, the intended policy was to use __environ in code that must conform to the ISO C namespace requirements, and environ elsewhere. this policy was not followed in practice anyway, making things confusing. on top of that, Jens reported that certain combinations of link-time optimization options were breaking with the inconsistent references; this seems to be a compiler or linker bug, but having it go away is a nice side effect of the changes made here.
2013-02-17add fgetgrent functionRich Felker-0/+9
based on patch by Isaac Dunham, moved to its own file to avoid increasing bss on static linked programs not using this nonstandard function but using the standard getgrent function, and vice versa.
2013-02-07fix typo in newly-added error message for EOWNERDEADRich Felker-1/+1
2013-02-07improve error stringsRich Felker-27/+30
this definitely has the potential to be a bikeshed topic, so some justification is in order. most of the changes made fit into one of the following categories: 1. alignment with text in posix, xsh 2.3 2. eliminating overly-specific text for shared error codes 3. making the message match more closely with the macro name 4. removing extraneous words in particular, the EAGAIN/EWOULDBLOCK text is updated to match the description of EAGAIN (which covers both uses) rather than saying the operation would block, and ENOTSUP/EOPNOTSUPP is updated not to mention sockets. the distinction between ENFILE/EMFILE has also been clarified; ENFILE is aligned with the posix text, and EMFILE, which lacks concise posix text matching any historic message, is updated to emphasize that the exhausted resource is not open files/open file descriptions, but rather the integer 'address space' of file descriptors. some messages may be further tweaked based on feedback.
2013-02-03base system() on posix_spawnRich Felker-41/+26
this avoids duplicating the fragile logic for executing an external program without fork.
2013-02-03fix unsigned comparison bug in posix_spawnRich Felker-1/+1
read should never return anything but 0 or sizeof ec here, but if it does, we want to treat any other return as "success". then the caller will get back the pid and is responsible for waiting on it when it immediately exits.
2013-02-03overhaul posix_spawn to use CLONE_VM instead of vforkRich Felker-55/+125
the proposed change was described in detail in detail previously on the mailing list. in short, vfork is unsafe because: 1. the compiler could make optimizations that cause the child to clobber the parent's local vars. 2. strace is buggy and allows the vforking parent to run before the child execs when run under strace. the new design uses a close-on-exec pipe instead of vfork semantics to synchronize the parent and child so that the parent does not return before the child has finished using its arguments (and now, also its stack). this also allows reporting exec failures to the caller instead of giving the caller a child that mysteriously exits with status 127 on exec error. basic testing has been performed on both the success and failure code paths. further testing should be done.
2013-02-03streamline old-kernel fallback path of pipe2 to use syscalls directlyRich Felker-4/+4
also, don't waste code/time on F_GETFL since pipes always have blank flags initially (at least on old kernels, which are all this fallback code matters for).
2013-02-02dynamically allocate storage for gethostby* buffersRich Felker-10/+32
this change shaves ~1k off libc.so bss size, and also avoids hard errors in the case where the static buffer was not large enough to hold the result. this whole framework is really ugly and might should be replaced or at least heavily overhauled when some changes/factorizations are made to getaddrinfo internals in the future.
2013-02-02fix blank ai_canonname from getaddrinfo for non-CNAMEsRich Felker-1/+1
2013-02-02fix memory leak due to double call to getaddrinfo in gethostbyname*Rich Felker-1/+0
2013-02-02fix error returns in gethostby*_r functionsRich Felker-17/+10
they're supposed to return an error code rather than using errno.
2013-02-02fix uninitialized map_len being used in munmap failure paths in load_libraryRich Felker-3/+2
this bug seems to have been introduced when the map_library signatures was changed to return the mapping in a temp dso structure instead of into separate variables.
2013-02-01fix stale locks left behind when pthread_create failsRich Felker-3/+6
this bug seems to have been around a long time.
2013-02-01if pthread_create fails, it must not attempt mmap if there is no mappingRich Felker-1/+1
this bug was introduced when support for application-provided stacks was originally added.
2013-02-01pthread stack treatment overhaul for application-provided stacks, etc.Rich Felker-23/+33
the main goal of these changes is to address the case where an application provides a stack of size N, but TLS has size M that's a significant portion of the size N (or even larger than N), thus giving the application less stack space than it expected or no stack at all! the new strategy pthread_create now uses is to only put TLS on the application-provided stack if TLS is smaller than 1/8 of the stack size or 2k, whichever is smaller. this ensures that the application always has "close enough" to what it requested, and the threshold is chosen heuristically to make sure "sane" amounts of TLS still end up in the application-provided stack. if TLS does not fit the above criteria, pthread_create uses mmap to obtain space for TLS, but still uses the application-provided stack for actual call frame stack. this is to avoid wasting memory, and for the sake of supporting ugly hacks like garbage collection based on assumptions that the implementation will use the provided stack range. in order for the above heuristics to ever succeed, the amount of TLS space wasted on POSIX TSD (pthread_key_create based) needed to be reduced. otherwise, these changes would preclude any use of pthread_create without mmap, which would have serious memory usage and performance costs for applications trying to create huge numbers of threads using pre-allocated stack space. the new value of PTHREAD_KEYS_MAX is the minimum allowed by POSIX, 128. this should still be plenty more than real-world applications need, especially now that C11/gcc-style TLS is now supported in musl, and most apps and libraries choose to use that instead of POSIX TSD when available. at the same time, PTHREAD_STACK_MIN has been decreased. it was originally set to PAGE_SIZE back when there was no support for TLS or application-provided stacks, and requests smaller than a whole page did not make sense. now, there are two good reasons to support requests smaller than a page: (1) applications could provide pre-allocated stacks smaller than a page, and (2) with smaller stack sizes, stack+TLS+TSD can all fit in one page, making it possible for applications which need huge numbers of threads with minimal stack needs to allocate exactly one page per thread. the new value of PTHREAD_STACK_MIN, 2k, is aligned with the minimum size for sigaltstack.
2013-02-02make some arrays constrofl0r-8/+8
this way they'll go into .rodata, decreasing memory pressure.
2013-02-01replace __wake function with macro that performs direct syscallRich Felker-10/+2
this should generate faster and smaller code, especially with inline syscalls. the conditional with cnt is ugly, but thankfully cnt is always a constant anyway so it gets evaluated at compile time. it may be preferable to make separate __wake and __wakeall macros without a count argument. priv flag is not used yet; private futex support still needs to be done at some point in the future.
2013-02-01fix up minor misplacement of restrict keyword in spawnattr sched stubsRich Felker-2/+2
2013-02-01revert regex "cleanup" that seems unjustified and may break backtrackingRich Felker-0/+3
it's not clear to me at the moment whether the code that was removed (and which is now being re-added) is needed, but it's far from being a no-op, and i don't want to risk breaking regex in this release.
2013-01-26fix tm_to_time logic for number of days in novemberRich Felker-1/+1
report/patch by Hiltjo Posthuma <hiltjo@codemadness.org>
2013-01-23add support for RTLD_NOLOAD to dlopenRich Felker-3/+7
based on patch by Pierre Carrier <pierre@gcarrier.fr> that just added the flag constant, but with minimal additional code so that it actually works as documented. this is a nonstandard option but some major software (reportedly, Firefox) uses it and it was easy to add anyway.
2013-01-23fix regression in dlsym: rejection of special RTLD_* handles as invalidRich Felker-1/+2
2013-01-16fix warning building dynlink.c stub for static libcRich Felker-2/+2
struct dso was not defined in this case, and it's not needed in the code that was using it anyway; void pointers work just as well.
2013-01-16fix bug in dladdr that prevented resolving addresses in the PLTRich Felker-1/+1
2013-01-15remove unused "params" related code from regexSzabolcs Nagy-21/+11
some structs and functions had reference to the params feature of tre that is not used by the code anymore
2013-01-14Merge remote-tracking branch 'nsz/math'Rich Felker-297/+207
2013-01-14regex: remove an unused local variable from regexecSzabolcs Nagy-3/+0
pos_start local variable is not used in tre_tnfa_run_backtrack
2013-01-13in crypt_des change unnecessary union keybuf into unsigned char[]Szabolcs Nagy-11/+8
original FreeSec code accessed keybuf as uint32* and uint8* as well (incorrectly), this got fixed with an union, but then it seems the uint32* access is no longer needed so the code can be simplified
2013-01-13crypt: fix the prototype of md5_sum, sha256_sum and sha512_sumSzabolcs Nagy-3/+3
the internal sha2 hash sum functions had incorrect array size in the prototype for the message digest argument, fixed by using pointer so it is not misleading
2013-01-13fix lio_listio return value in LIO_WAIT modeSzabolcs Nagy-1/+1
2013-01-10check for invalid handles in dlsym/dlcloseRich Felker-1/+17
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
2013-01-07math: erf and erfc cleanupSzabolcs Nagy-297/+207
common part of erf and erfc was put in a separate function which saved some space and the new code is using unsigned arithmetics erfcf had a bug: for some inputs in [7.95,8] the result had more than 60ulp error: in expf(-z*z - 0.5625f) the argument must be exact but not enough lowbits of z were zeroed, -SET_FLOAT_WORD(z, ix&0xfffff000); +SET_FLOAT_WORD(z, ix&0xffffe000); fixed the issue
2013-01-04__assert_fail(): remove _Noreturn, to get proper stacktracesrofl0r-1/+1
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).
2013-01-01math: bessel cleanup (jn.c and jnf.c)Szabolcs Nagy-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
2013-01-01math: bessel cleanup (j1.c and j1f.c)Szabolcs Nagy-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)
2013-01-01math: bessel cleanup (j0.c and j0f.c)Szabolcs Nagy-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
2012-12-26fix alignment logic in strlcpyRich Felker-1/+1
2012-12-25fix reference to libc struct in static tls init codeRich Felker-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.
2012-12-20clean up and fix logic for making mmap fail on invalid/unsupported offsetsRich Felker-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.
2012-12-19merge a few fixes by sh4rm4Rich Felker-0/+11
2012-12-19add inet_network (required for wine)rofl0r-0/+11
2012-12-16math: use 0x1p-120f and 0x1p120f for tiny and huge valuesSzabolcs Nagy-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)
2012-12-16math: tgammal.c fixesSzabolcs Nagy-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
2012-12-16math: tanh.c cleanup similar to sinh, coshSzabolcs Nagy-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
2012-12-16math: sinh.c cleanup similar to the cosh oneSzabolcs Nagy-171/+72
comments are kept in the double version of the function
2012-12-16math: finished cosh.c cleanupSzabolcs Nagy-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.
2012-12-16math: x86_64 version of expl, fixed some comments in the i386 versionSzabolcs Nagy-4/+112
2012-12-16math: move x86_64 exp2l implementation to exp2l.s from expl.sSzabolcs Nagy-85/+76
2012-12-15fix breakage in ldd (failure to print library load address)Rich Felker-2/+2