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* block pthread cancellation in openpty functionRich Felker2014-12-201-9/+14
| | | | | | | being a nonstandard function, this isn't strictly necessary, but it's inexpensive and avoids unpleasant surprises. eventually I would like all functions in libc to be safe against cancellation, either ignoring it or acting on it cleanly.
* don't write openpty results until success is determinedRich Felker2014-12-201-10/+12
| | | | | | not only is this semantically more correct; it also reduces code size slightly by eliminating the need for the compiler to assume the possibility of aliasing.
* add login_tty functionFelix Janda2014-12-202-0/+16
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* set optopt in getopt_longRich Felker2014-12-201-0/+1
| | | | | | this is undocumented but possibly expected behavior of GNU getopt_long, and useful when error message printing has been suppressed.
* add error message printing to getopt_long and make related improvementsRich Felker2014-12-202-6/+32
| | | | | some related changes are also made to getopt, and the return value of getopt_long in the case of missing arguments is fixed.
* support translation for getopt error messagesRich Felker2014-12-201-0/+2
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* fix stderr locking and ferror semantics in getopt message printingRich Felker2014-12-191-12/+16
| | | | | | | | | | if writing the error message fails, POSIX requires that ferror(stderr) be set. and as a function that operates on a stdio stream, getopt is required to lock the stream it uses, stderr. fwrite calls are used instead of fprintf since there is a demand from some users not to pull in heavy stdio machinery via getopt. this mimics the original code using write.
* use tkill instead of tgkill in implementing raiseRich Felker2014-12-181-3/+2
| | | | | | | | | | this shaves off a useless syscall for getting the caller's pid and brings raise into alignment with other functions which were adapted to use tkill rather than tgkill. commit 83dc6eb087633abcf5608ad651d3b525ca2ec35e documents the rationale for this change, and in particular why the tgkill syscall is useless for its designed purpose of avoiding races.
* don't suppress sign output for NANs in printfRich Felker2014-12-181-1/+1
| | | | | | | | | formally, it seems a sign is only required when the '+' modifier appears in the format specifier, in which case either '+' or '-' must be present in the output. but the specification is written such that an optional negative sign is part of the output format anyway, and the simplest approach to fixing the problem is removing the code that was suppressing the sign.
* fix return value computation in one code path of wcsnrtombsRich Felker2014-12-181-1/+1
| | | | the affected code was wrongly counting characters instead of bytes.
* fix signedness of WINT_MIN expressionRich Felker2014-12-171-1/+1
| | | | since wint_t is unsigned, WINT_MIN needs to expand to an unsigned zero.
* make the definition of _Complex_I explicitly complexRich Felker2014-12-171-2/+2
| | | | | | | it's unclear whether compilers which provide pure imaginary types might produce a pure imaginary expression for 1.0fi. using 0.0f+1.0fi ensures that the result is explicitly complex and makes this obvious to human readers too.
* make the result of the cimag macro a non-lvalueRich Felker2014-12-171-1/+1
| | | | | this change is not necessary but helps diagnose invalid code. based on patch by Jens Gustedt.
* fix definition of CMPLX macros in complex.h to work in constant expressionsRich Felker2014-12-171-3/+9
| | | | | | | | | | | | | | | | | based on patches by Jens Gustedt. these macros need to be usable in static initializers, and the old definitions were not. there is no portable way to provide correct definitions for these macros unless the compiler supports pure imaginary types. a portable definition is provided for this case even though there are presently no compilers that can use it. gcc and compatible compilers provide a builtin function that can be used, but clang fails to support this and instead requires a construct which is a constraint violation and which is only a constant expression as a clang-specific extension. since these macros are a namespace violation in pre-C11 profiles, and since no known pre-C11 compilers provide any way to define them correctly anyway, the definitions have been made conditional on C11.
* provide CMPLX macros in implementation-internal libm.hRich Felker2014-12-171-0/+12
| | | | | | this avoids assuming the presence of C11 macro definitions in the public complex.h, which need changes potentially incompatible with the way these macros are being used internally.
* implement FNM_CASEFOLD extension to fnmatch functionNagy Szabolcs2014-12-171-11/+25
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* add basic dns record parsing functionsRich Felker2014-12-172-35/+194
| | | | | | | | | | | | based on patch by Timo Teräs, with some corrections to bounds checking code and other minor changes. while they are borderline scope creep, the functions added are fairly small and are roughly the minimum code needed to use the results of the res_query API without re-implementing error-prone DNS packet parsing, and they are used in practice by some kerberos related software and possibly other things. at this time there is no intent to implement further nameser.h API functions.
* correctly handle write errors encountered by printf-family functionsRich Felker2014-12-172-2/+12
| | | | | | | | | | | | | | | | | | previously, write errors neither stopped further output attempts nor caused the function to return an error to the caller. this could result in silent loss of output, possibly in the middle of output in the event of a non-permanent error. the simplest solution is temporarily clearing the error flag for the target stream, then suppressing further output when the error flag is set and checking/restoring it at the end of the operation to determine the correct return value. since the wide version of the code internally calls the narrow fprintf to perform some of its underlying operations, initial clearing of the error flag is suppressed when performing a narrow vfprintf on a wide-oriented stream. this is not a problem since the behavior of narrow operations on wide-oriented streams is undefined.
* simplify getopt_long argv permutation loop logicRich Felker2014-12-131-3/+1
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* fix handling of "--" with getopt_long argv permutationRich Felker2014-12-131-1/+0
| | | | | | if argv permutation is used, the option terminator "--" should be moved before any skipped non-option arguments rather than being left in the argv tail where the caller will see and interpret it.
* accept null longopts pointer in getopt_longRich Felker2014-12-111-1/+1
| | | | | this is an undocumented feature of GNU getopt_long that the BSD version also mimics, and is reportedly needed by some programs.
* fix getopt handling of initial '+' in optstringRich Felker2014-12-101-1/+1
| | | | | | | in the case where an initial '+' was passed in optstring (a getopt_long feature to suppress argv permutation), getopt would fail to see a possible subsequent ':', resulting in incorrect handling of missing arguments.
* support abbreviated options in getopt_longRich Felker2014-12-101-7/+18
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* support options after non-option arguments in getopt_long (argv permutation)Rich Felker2014-12-101-0/+39
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* don't shadow functions with macros in C++Bobby Bingham2014-12-093-0/+6
| | | | | | | | | | C++ programmers typically expect something like "::function(x,y)" to work and may be surprised to find that "(::function)(x,y)" is actually required due to the headers declaring a macro version of some standard functions. We already omit function-like macros for C++ in most cases where there is a real function available. This commit extends this to the remaining function-like macros which have a real function version.
* use direct syscall rather than write function in posix_spawn childRich Felker2014-12-051-1/+1
| | | | | | | | the write function is a cancellation point and accesses thread-local state belonging to the calling thread in the parent process. since cancellation is blocked for the duration of posix_spawn, this is probably safe, but it's fragile and unnecessary. making the syscall directly is just as easy and clearly safe.
* don't fail posix_spawn on failed closeRich Felker2014-12-051-2/+1
| | | | | | | the resolution of austin group issue #370 removes the requirement that posix_spawn fail when the close file action is performed on an already-closed fd. since there are no other meaningful errors for close, just ignoring the return value completely is the simplest fix.
* fix getopt handling of ':' modifier for multibyte option charactersRich Felker2014-12-041-4/+9
| | | | | | | | | the previous hard-coded offsets of +1 and +2 contained a hidden assumption that the option character matched was single-byte, despite this implementation of getopt attempting to support multibyte option characters. this patch reworks the matching logic to leave the final index pointing just past the matched character so that fixed offsets can be used to check for ':'.
* add arm private syscall numbersTimo Teräs2014-12-031-0/+5
| | | | it is part of kernel uapi, and some programs (e.g. nodejs) do use them
* fix return value of pthread_getaffinity_np and pthread_setaffinity_npRich Felker2014-12-021-8/+11
| | | | | these functions are expected to return an error code rather than setting errno and returning -1.
* fix uninitialized output from sched_getaffinityRich Felker2014-12-021-1/+5
| | | | | | | the sched_getaffinity syscall only fills a cpu set up to the set size used/supported by the kernel. the rest is left untouched and userspace is responsible for zero-filling it based on the return value of the syscall.
* add support for non-option arguments extension to getoptGianluca Anzolin2014-12-022-4/+20
| | | | | | | this is a GNU extension, activated by including '-' as the first character of the options string, whereby non-option arguments are processed as if they were arguments to an option character '\1' rather than ending option processing.
* adapt dynamic linker for new binutils versions that omit DT_RPATHRich Felker2014-11-231-0/+2
| | | | | | | | the new DT_RUNPATH semantics for search order are always used, and since binutils had always set both DT_RPATH and DT_RUNPATH when the latter was used, processing only DT_RPATH worked fine. however, recent binutils has stopped generating DT_RPATH when DT_RUNPATH is used, which broke support for this feature completely.
* fix tabs/spaces in memcpy.sRich Felker2014-11-231-279/+279
| | | | | | this file had been a mess that went unnoticed ever since it was imported. some lines used spaces for indention while others used tabs, and tabs were used for alignment.
* fix build regression in arm asm for setjmp/longjmp with old assemblersRich Felker2014-11-232-2/+2
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* fix build regression in arm asm for memcpyRich Felker2014-11-231-30/+30
| | | | | | | | | | | | | | | | | commit 27828f7e9adb6b4f93ca56f6f98ef4c44bb5ed4e fixed compatibility with clang's internal assembler, but broke compatibility with gas and the traditional arm asm syntax by switching to the arm "unified assembler language" (UAL). recent versions of gas also support UAL, but require the .syntax directive to be used to switch to it. clang on the other hand defaults to UAL. and old versions of gas (still relevant) don't support UAL at all. for the conditional ldm/stm instructions, "ia" is default and can just be omitted, resulting in a mnemonic that's compatible with both traditional and UAL syntax. but for byte/halfword loads and stores, there seems to be no mnemonic compatible with both, and thus .word is used to produce the desired opcode explicitly. the .inst directive is not used because it is not compatible with older assemblers.
* arm assembly changes for clang compatibilityJoakim Sindholt2014-11-233-32/+32
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* unify non-inline version of syscall code across archsRich Felker2014-11-224-104/+16
| | | | | | | | | | | | | | except powerpc, which still lacks inline syscalls simply because nobody has written the code, these are all fallbacks used to work around a clang bug that probably does not exist in versions of clang that can compile musl. however, it's useful to have the generic non-inline code anyway, as it eases the task of porting to new archs: writing inline syscall code is now optional. this approach could also help support compilers which don't understand inline asm or lack support for the needed register constraints. mips could not be unified because it has special fixup code for broken layout of the kernel's struct stat.
* inline 5- and 6-argument syscalls on armRich Felker2014-11-221-2/+15
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* remove old clang workarounds from arm syscall implementationRich Felker2014-11-221-31/+0
| | | | | | | | | | the register constraints in the non-clang case were tested to work on clang back to 3.2, and earlier versions of clang have known bugs that preclude building musl. there may be other reasons to prefer not to use inline syscalls, but if so the function-call-based implementations should be added back in a unified way for all archs.
* fix __aeabi_read_tp oversight in arm atomics/tls overhaulRich Felker2014-11-223-10/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | calls to __aeabi_read_tp may be generated by the compiler to access TLS on pre-v6 targets. previously, this function was hard-coded to call the kuser helper, which would crash on kernels with kuser helper removed. to fix the problem most efficiently, the definition of __aeabi_read_tp is moved so that it's an alias for the new __a_gettp. however, on v7+ targets, code to initialize the runtime choice of thread-pointer loading code is not even compiled, meaning that defining __aeabi_read_tp would have caused an immediate crash due to using the default implementation of __a_gettp with a HCF instruction. fortunately there is an elegant solution which reduces overall code size: putting the native thread-pointer loading instruction in the default code path for __a_gettp, so that separate default/native code paths are not needed. this function should never be called before __set_thread_area anyway, and if it is called early on pre-v6 hardware, the old behavior (crashing) is maintained. ideally __aeabi_read_tp would not be called at all on v7+ targets anyway -- in fact, prior to the overhaul, the same problem existed, but it was never caught by users building for v7+ with kuser disabled. however, it's possible for calls to __aeabi_read_tp to end up in a v7+ binary if some of the object files were built for pre-v7 targets, e.g. in the case of static libraries that were built separately, so this case needs to be handled.
* overhaul ARM atomics/tls for performance and compatibilityRich Felker2014-11-196-56/+331
| | | | | | | | | | | | | | | | | | | | | | | | previously, builds for pre-armv6 targets hard-coded use of the "kuser helper" system for atomics and thread-pointer access, resulting in binaries that fail to run (crash) on systems where this functionality has been disabled (as a security/hardening measure) in the kernel. additionally, builds for armv6 hard-coded an outdated/deprecated memory barrier instruction which may require emulation (extremely slow) on future models. this overhaul replaces the behavior for all pre-armv7 builds (both of the above cases) to perform runtime detection of the appropriate mechanisms for barrier, atomic compare-and-swap, and thread pointer access. detection is based on information provided by the kernel in auxv: presence of the HWCAP_TLS bit for AT_HWCAP and the architecture version encoded in AT_PLATFORM. direct use of the instructions is preferred when possible, since probing for the existence of the kuser helper page would be difficult and would incur runtime cost. for builds targeting armv7 or later, the runtime detection code is not compiled at all, and much more efficient versions of the non-cas atomic operations are provided by using ldrex/strex directly rather than wrapping cas.
* save auxv pointer into libc struct early in dynamic linker startupRich Felker2014-11-191-0/+1
| | | | | this allows most code to assume it has already been saved, and is a prerequisite for upcoming changes for arm atomic/tls operations.
* getopt: fix optional argument processingFelix Fietkau2014-11-151-2/+2
| | | | | | | Processing an option character with optional argument fails if the option is last on the command line. This happens because the if (optind >= argc) check runs first before testing for optional argument.
* implement a private state for the uchar.h functionsJens Gustedt2014-11-153-0/+6
| | | | | | | | | | | | | | | | | | | | | | The C standard is imperative on that: 7.28.1 ... If ps is a null pointer, each function uses its own internal mbstate_t object instead, which is initialized at program startup to the initial conversion state; and these functions are also not supposed to implicitly use the state of the wchar.h functions: 7.29.6.3 ... The implementation behaves as if no library function calls these functions with a null pointer for ps. Previously this resulted in two bugs. - The functions c16rtomb and mbrtoc16 would crash when called with ps set to null. - The function mbrtoc32 used the private state of mbrtowc, which it is not allowed to do.
* fix behavior of printf with alt-form octal, zero precision, zero valueRich Felker2014-11-151-1/+1
| | | | | | | | | | | | in this case there are two conflicting rules in play: that an explicit precision of zero with the value zero produces no output, and that the '#' modifier for octal increases the precision sufficiently to yield a leading zero. ISO C (7.19.6.1 paragraph 6 in C99+TC3) includes a parenthetical remark to clarify that the precision-increasing behavior takes precedence, but the corresponding text in POSIX off of which I based the implementation is missing this remark. this issue was covered in WG14 DR#151.
* math: use fnstsw consistently instead of fstsw in x87 asmSzabolcs Nagy2014-11-0511-11/+11
| | | | | | fnstsw does not wait for pending unmasked x87 floating-point exceptions and it is the same as fstsw when all exceptions are masked which is the only environment libc supports.
* math: fix x86_64 and x32 asm not to use sahf instructionSzabolcs Nagy2014-11-056-28/+14
| | | | | | | | | | | Some early x86_64 cpus (released before 2006) did not support sahf/lahf instructions so they should be avoided (intel manual says they are only supported if CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1). The workaround simplifies exp2l and expm1l because fucomip can be used instead of the fucomp;fnstsw;sahf sequence copied from i386. In fmodl and remainderl sahf is replaced by a simple bit test.
* fix 64-bit syscall argument passing on or1kRich Felker2014-11-051-1/+1
| | | | | | the kernel syscall interface for or1k does not expect 64-bit arguments to be aligned to "even" register boundaries. this incorrect alignment broke truncate/ftruncate and as well as a few less-common syscalls.
* fix uninitialized mode variable in openat functionRich Felker2014-10-311-1/+1
| | | | | this was introduced in commit 2da3ab1382ca8e39eb1e4428103764a81fba73d3 as an oversight while making the variadic argument access conditional.
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