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* make syscall.h consistent with linuxSzabolcs Nagy2017-09-0610-24/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | most of the found naming differences don't matter to musl, because internally it unifies the syscall names that vary across targets, but for external code the names should match the kernel uapi. aarch64: __NR_fstatat is called __NR_newfstatat in linux. __NR_or1k_atomic got mistakenly copied from or1k. arm: __NR_arm_sync_file_range is an alias for __NR_sync_file_range2 __NR_fadvise64_64 is called __NR_arm_fadvise64_64 in linux, the old non-arm name is kept too, it should not cause issues. (powerpc has similar nonstandard fadvise and it uses the normal name.) i386: __NR_madvise1 was removed from linux in commit 303395ac3bf3e2cb488435537d416bc840438fcb 2011-11-11 microblaze: __NR_fadvise, __NR_fstatat, __NR_pread, __NR_pwrite had different name in linux. mips: __NR_fadvise, __NR_fstatat, __NR_pread, __NR_pwrite, __NR_select had different name in linux. mipsn32: __NR_fstatat is called __NR_newfstatat in linux. or1k: __NR__llseek is called __NR_llseek in linux. the old name is kept too because that's the name musl uses internally. powerpc: __NR_{get,set}res{gid,uid}32 was never present in powerpc linux. __NR_timerfd was briefly defined in linux but then got renamed.
* handle whitespace before %% in scanfBartosz Brachaczek2017-09-042-5/+13
| | | | | this is mandated by C and POSIX standards and is in accordance with glibc behavior.
* fix OOB reads in Xbyte_memmemAlexander Monakov2017-09-041-9/+9
| | | | Reported by Leah Neukirchen.
* free allocations in clearenvAlexander Monakov2017-09-041-2/+6
| | | | | | This aligns clearenv with the Linux man page by setting 'environ' rather than '*environ' to NULL, and stops it from leaking entries allocated by the libc.
* overhaul environment functionsAlexander Monakov2017-09-044-81/+86
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rewrite environment access functions to slim down code, fix bugs and avoid invoking undefined behavior. * avoid using int-typed iterators where size_t would be correct; * use strncmp instead of memcmp consistently; * tighten prologues by invoking __strchrnul; * handle NULL environ. putenv: * handle "=value" input via unsetenv too (will return -1/EINVAL); * rewrite and simplify __putenv; fix the leak caused by failure to deallocate entry added by preceding setenv when called from putenv. setenv: * move management of libc-allocated entries to this translation unit, and use no-op weak symbols in putenv/unsetenv; unsetenv: * rewrite; this fixes UB caused by testing a free'd pointer against NULL on entry to subsequent loops. Not changed: Failure to extend allocation tracking array (previously __env_map, now env_alloced) is ignored rather than causing to report -1/ENOMEM to the caller; the worst-case consequence is leaking this allocation when it is removed or replaced in a subsequent environment access. Initially UB in unsetenv was reported by Alexander Cherepanov. Using a weak alias to avoid pulling in malloc via unsetenv was suggested by Rich Felker.
* fix erroneous acceptance of f4 9x xx xx code sequences by utf-8 decoderRich Felker2017-09-011-1/+1
| | | | | | | the DFA table controlling accepted ranges for the f4 prefix used an incorrect upper bound of 0xa0 where it should have been 0x90, allowing such sequences to be accepted and decoded as non-Unicode-scalar values 0x110000 through 0x11ffff.
* fix erroneous stop before input limit in mbsnrtowcs and wcsnrtombsRich Felker2017-08-312-2/+6
| | | | | | | | | | the value computed as an output limit that bounds the amount of input consumed below the input limit was incorrectly being used as the actual amount of input consumed. instead, compute the actual amount of input consumed as a difference of pointers before and after the conversion. patch by Mikhail Kremnyov.
* arm: add HWCAP_ARM_ hwcap macrosSzabolcs Nagy2017-08-291-0/+24
| | | | | | | Glibc renamed the linux uapi HWCAP_* macros to HWCAP_ARM_* so have both variants in case some code depends on it. (The HWCAP2_ macros are not defined in glibc currently so those only have the linux uapi variant.)
* add a_clz_64 helper functionSzabolcs Nagy2017-08-298-0/+70
| | | | | | | | | counts leading zero bits of a 64bit int, undefined on zero input. (has nothing to do with atomics, added to atomic.h so target specific helper functions are together.) there is a logarithmic generic implementation and another in terms of a 32bit a_clz_32 on targets where that's available.
* s390x: add bits/hwcap.hSzabolcs Nagy2017-08-291-0/+15
| | | | | aligned with linux arch/s390/include/asm/elf.h (these macros should be exported into uapi, but they are not)
* move IPPORT_RESERVED from netdb.h to netinet/in.hRich Felker2017-08-292-2/+2
| | | | | it's in the reserved namespace for the latter, where it seems it was historically defined, and some programs expect to find it there.
* add powerpc64 and s390x to list of supported archs in INSTALL fileRich Felker2017-08-291-1/+9
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* fix undefined behavior in memset due to missing sequence pointsRich Felker2017-08-291-4/+8
| | | | patch by Pascal Cuoq.
* __init_libc: add fallbacks for __progname setupAlexander Monakov2017-08-291-4/+4
| | | | | | | | | | | | It is possible for argv[0] to be a null pointer, but the __progname variable is used to implement functions in src/legacy/err.c that do not expect it to be null. It is also available to the user via the program_invocation_name alias as a GNU extension, and the implementation in Glibc initializes it to a pointer to empty string rather than NULL. Since argv[0] is usually non-null and it's preferable to keep those variables in BSS, implement the fallbacks in __init_libc, which also allows to have an intermediate fallback to AT_EXECFN.
* add SIOCGSTAMPNS socket ioctl macro to ioctl.hSzabolcs Nagy2017-08-298-0/+8
| | | | | | | | | | it is defined in linux asm/sockios.h since commit ae40eb1ef30ab4120bd3c8b7e3da99ee53d27a23 (linux v2.6.22) but was missing from musl by accident. in musl the sockios macros are exposed in sys/ioctl.h together with other ioctl requests instead of in sys/socket.h because of namespace rules. (glibc has them in sys/socket.h under _GNU_SOURCE.)
* fix mips ioctl macros to match linux asm/sockios.hSzabolcs Nagy2017-08-293-15/+15
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* fix unsynchronized access to FILE structure in fflush(0)Rich Felker2017-08-291-1/+4
| | | | | | commit c002668eb0352e619ea7064e4940b397b4a6e68d inadvertently moved the check for unflushed write buffer outside of the scope of the existing lock.
* fix signed overflow in ftokDaniel Sabogal2017-08-121-1/+1
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* fix build failure for sh4a due to missing colon in asm statementThomas Petazzoni2017-08-111-1/+1
| | | | | | Due to a missing ":" in an asm() statement, the "memory" clobber is considered by gcc as an input operand and not a clobber, which causes a build failure.
* trap UB from attempts to join a detached threadRich Felker2017-08-111-0/+1
| | | | | | | | | | | | | | passing to pthread_join the id of a thread which is not joinable results in undefined behavior. in principle the check to trap does not necessarily work if pthread_detach was called after thread creation, since no effort is made here to synchronize access to t->detached, but the check is well-defined and harmless for callers which did not invoke UB, and likely to help catch erroneous code that would otherwise mysteriously hang. patch by William Pitcock.
* ppc64: fix setjmp/longjmp handling of TOC pointerBobby Bingham2017-08-113-17/+39
| | | | | | | | | | | | | | | | | | | | | | | | | | The TOC pointer is constant within a single dso, but needs to be saved and restored around cross-dso calls. The PLT stub saves it to the caller's stack frame, and the linker adds code to the caller to restore it. With a local call, as within a single dso or with static linking, this doesn't happen and the TOC pointer is always in r2. Therefore, setjmp/longjmp need to save/restore the TOC pointer from/to different locations depending on whether the call to setjmp was a local or non-local call. It is always safe for longjmp to restore to both r2 and the caller's stack. If the call to setjmp was local, and only r2 matters and the stack location will be ignored, but is required by the ABI to be reserved for the TOC pointer. If the call was non-local, then only the stack location matters, and whatever is restored into r2 will be clobbered anyway when the caller reloads r2 from the stack. A little extra care is required for sigsetjmp, because it uses setjmp internally. After the second return from this setjmp call, r2 will contain the caller's TOC pointer instead of libc's TOC pointer. We need to save and restore the correct libc pointer before we can tail call to __sigsetjmp_tail.
* qsort: add a short comment about the algorithmLeah Neukirchen2017-08-111-0/+3
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* disable global visibility override hack (vis.h) by defaultRich Felker2017-08-111-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | neither current compilers nor linkers treat protected visibility the way I expected, as having fixed source-level semantics rather than being dependent on target-specific ABI details, and change seems unlikely. while the use here does not actually depend on the specific semantics, at least some versions of some linkers, especially lld, refuse to allow linking to a libc.so where the symbols have protected visibility. this cannot be detected at configure-time because linking libc.so itself works fine, and because even if we could test linking an application against libc.so successfully, we could not justifiably assume that the same linker used to link libc.so would also be used later to link applications. disable the vis.h hack by default at the configure level, but add an explicit "auto" option to request the old configure-time detection rather than just removing it. this leaves it easy to evaluate whether it actually resulted in significant size or performance benefits while ensuring that out-of-the-box builds are not unlinkable for some users. fortunately, preliminary evaluation suggests that at least x86_64, arm, and aarch64 don't suffer at all from the change, and impact on other archs is low. if low is not low enough, it should not be hard to analyze where the significant PLT call ABI costs are present and mitigate them without the hack.
* add _NL_LOCALE_NAME extension to nl_langinfoRich Felker2017-07-312-0/+10
| | | | | | | | | | | | | | | | | since setlocale(cat, NULL) is required to return the setting for the global locale, there is no standard mechanism to obtain the name of the currently active thread-local locale set by uselocale. this makes it impossible for application/library software to load appropriate translations, etc. unless using the gettext implementation provided by libc, which has privileged access to libc internals. to fill this gap, glibc introduced the _NL_LOCALE_NAME macro which can be used with nl_langinfo to obtain the name. GNU gettext/gnulib code already use this functionality on glibc, and can easily be adapted to make use of it on non-glibc systems if it's available; for other systems they poke at locale implementation internals, which we want to avoid. this patch provides a compatible interface to the one glibc introduced.
* fix missing volatile qualifier on lock in __get_localeJens Gustedt2017-07-041-1/+1
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* remove ineffective compiler assist from printfAlexander Monakov2017-07-042-4/+0
| | | | | | The switch statement has no 'default:' case and the function ends immediately following the switch, so the extra comparison did not communicate any extra information to the compiler.
* fix undefined behavior in ptraceAlexander Monakov2017-07-041-2/+6
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* unify the use of FUTEX_PRIVATEJens Gustedt2017-07-044-4/+4
| | | | | | The flag 1<<7 is used in several places for different purposes that are not always easy to distinguish. Mark those usages that correspond to the flag that is used by the kernel for futexes.
* fix undefined behavior in freeAlexander Monakov2017-07-041-2/+3
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* reapply va_arg hacks removal to wprintfAlexander Monakov2017-07-041-26/+1
| | | | | commit 58e2396a9aa23c132faf4198ca4d779c84955b38 missed that the same code was duplicated in implementation of vfwprintf.
* remove useless declarations in string.hAlexander Monakov2017-07-041-2/+0
| | | | | The two functions str{,n}casecmp_l are specified to be declared in <strings.h> which is already included from <string.h> under _GNU_SOURCE.
* allow specifying argv[0] when invoking a program via ldso commandRich Felker2017-07-041-0/+7
| | | | | | previously, the pathname used to load the program was always used as argv[0]. the default remains the same, but a new --argv0 option can be used to provide a different value.
* fix regression in dlopen promotion from RTLD_LOCAL to RTLD_GLOBALRich Felker2017-07-041-1/+6
| | | | | | commit 4ff234f6cba96403b5de6d29d48a59fd73252040 inadvertently removed the logic to do this when changing the representation of global status.
* ldso: avoid spurious & possible erroneous work for libs with no depsRich Felker2017-07-041-4/+7
| | | | | | | | | | | | | | | | | | a null pointer for a library's deps list was ambiguous: it could indicate either no dependencies or that the dependency list had not yet been populated. inability to distinguish could lead to spurious work when dlopen is called multiple times on a library with no deps, and due to related bugs, could actually cause other libraries to falsely appear as dependencies, translating into false positives for dlsym. avoid the problem by always initializing the deps pointer, pointing to an empty list if there are no deps. rather than wasting memory and introducing another failure path by allocating an empty list per library, simply share a global dummy list. further fixes will be needed for related bugs, and much of this code may end up being replaced.
* powerpc64: add single-instruction math functionsRich Felker2017-06-2322-0/+290
| | | | | | | | | | while the official elfv2 abi for "powerpc64le" sets power8 as the baseline isa, we use it for both little and big endian powerpc64 targets and need to maintain compatibility with pre-power8 models. the instructions for sqrt, fabs, and fma are in the baseline isa; support for the rest is conditional via predefined isa-level macros. patch by David Edelsohn.
* fix clang CFLAGS checks and silence unused argument warningsDmitry Golovin2017-06-231-0/+8
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* s390x: add single-instruction math functionsRich Felker2017-06-2324-0/+360
| | | | | | | | these were introduced in z196 and not available in the baseline (z900) ISA level. use __HTM__ as an alternate indicator for ISA level, since gcc did not define __ARCH__ until 7.x. patch by David Edelsohn.
* fix arm run-time abi string functionsSzabolcs Nagy2017-06-226-36/+76
| | | | | | | | | in arm rtabi these __aeabi_* functions have special abi (they are only allowed to clobber r0,r1,r2,r3,ip,lr,cpsr), so they cannot be simple wrappers around normal string functions (which may clobber other registers), the safest solution is to write them in asm, a minimalistic implementation works because these are not supposed to be emitted by compilers or used in general.
* fix regression in getspnam[_r] error code for insufficient buffer sizeRich Felker2017-06-211-1/+1
| | | | | commit 2d7d05f031e014068a61d3076c6178513395d2ae wrongly changed ERANGE to EINVAL, likely as the result of copy-and-paste error.
* fix omission of microblaze user.h definitionsRich Felker2017-06-211-1/+25
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* fix iconv conversions for iso88592-iso885916Bartosz Brachaczek2017-06-201-1/+1
| | | | | | | commit 97bd6b09dbe7478d5a90a06ecd9e5b59389d8eb9 refactored the table lookup into a function and introduced an error in index computation. the error caused garbage to be read from the table if the given charmap had a non-zero number of elided entries.
* handle errors from localtime_r in ctime_rRich Felker2017-06-201-3/+2
| | | | | | | | POSIX requires ctime_r return a null pointer on failure, which can occur if the input time_t value is not representable in broken down form. based on patch by Alexander Monakov.
* set errno when getpw*_r, getgr*_r, and getspnam_r failRich Felker2017-06-153-3/+7
| | | | | | | | | these functions return an error code, and are not explicitly documented to set errno, but they are nonstandard and the historical implementations do set errno as well, and some applications expect this behavior. do likewise for compatibility. patch by Rudolph Pereira.
* handle localtime errors in ctimeRich Felker2017-06-151-1/+3
| | | | | | | | ctime passes the result from localtime directly to asctime. But in case of error, localtime returns 0. This causes an error (NULL pointer dereference) in asctime. based on patch by Omer Anson.
* handle mremap failure in realloc of mmap-serviced allocationsRich Felker2017-06-151-1/+2
| | | | | | | | | mremap seems to always fail on nommu, and on some non-Linux implementations of the Linux syscall API, it at least fails to increase allocation size, and may fail to move (i.e. defragment) the existing mapping when shrinking it too. instead of failing realloc or leaving an over-sized allocation that may waste a large amount of memory, fallback to malloc-memcpy-free if mremap fails.
* getdate: correctly specify error numberA. Wilcox2017-06-141-1/+2
| | | | | | | | | | POSIX defines getdate error #5 as: "An I/O error is encountered while reading the template file." POSIX defines getdate error #7 as: "There is no line in the template that matches the input." This change correctly disambiguates between the two error conditions.
* catopen: set errno to EOPNOTSUPPA. Wilcox2017-06-141-0/+2
| | | | | | | Per 1003.1-2008 (2016 ed.), catopen must set errno on failure. We set errno to EOPNOTSUPP because musl does not currently support message catalogues.
* fix glob failure to match plain "/" to root directoryRich Felker2017-06-081-1/+1
| | | | | | | | the check to prevent matching empty string wrongly blocked matching of "/" due to checking emptiness after stripping leading slashes rather than checking the full original argument string. simplified from patch by Julien Ramseier.
* use hard-coded sh4a atomic opcodes to avoid linker errors on shRich Felker2017-06-081-4/+4
| | | | | | | when using the sh4a opcodes, the assembler tags the resulting object file as requiring sh4a. the linker then refuses to (static) link it with object files marked as requiring j2, since there is no isa level that includes both sh4a and j2 instructions.
* towupper/towlower: fast path for ascii charsNatanael Copa2017-05-311-3/+3
| | | | | Make a fast path for ascii chars which is assumed to be the most common case. This has significant performance benefit on xml json and similar
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