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* add wcsftime_t aliasRich Felker2013-08-021-0/+3
| | | | this is a nonstandard extension.
* add missing c++ extern "C" wrapping to link.hRich Felker2013-08-021-0/+8
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* make fchdir, fchmod, fchown, and fstat support O_PATH file descriptorsRich Felker2013-08-024-5/+37
| | | | | | | | | on newer kernels, fchdir and fstat work anyway. this same fix should be applied to any other syscalls that are similarly affected. with this change, the current definitions of O_SEARCH and O_EXEC as O_PATH are mostly conforming to POSIX requirements. the main remaining issue is that O_NOFOLLOW has different semantics.
* debloat code that depends on /proc/self/fd/%d with shared functionRich Felker2013-08-025-6/+26
| | | | | | | I intend to add more Linux workarounds that depend on using these pathnames, and some of them will be in "syscall" functions that, from an anti-bloat standpoint, should not depend on the whole snprintf framework.
* work around linux's lack of flags argument to fchmodat syscallRich Felker2013-08-021-1/+29
| | | | | | | | | | | | | | | | | | | previously, the AT_SYMLINK_NOFOLLOW flag was ignored, giving dangerously incorrect behavior -- the target of the symlink had its modes changed to the modes (usually 0777) intended for the symlink). this issue was amplified by the fact that musl provides lchmod, as a wrapper for fchmodat, which some archival programs take as a sign that symlink modes are supported and thus attempt to use. emulating AT_SYMLINK_NOFOLLOW was a difficult problem, and I originally believed it could not be solved, at least not without depending on kernels newer than 3.5.x or so where O_PATH works halfway well. however, it turns out that accessing O_PATH file descriptors via their pseudo-symlink entries in /proc/self/fd works much better than trying to use the fd directly, and works even on older kernels. moreover, the kernel has permanently pegged these references to the inode obtained by the O_PATH open, so there should not be race conditions with the file being moved, deleted, replaced, etc.
* move RPATH search after LD_LIBRARY_PATH searchRich Felker2013-08-021-2/+2
| | | | | | | | | this is the modern way, and the only way that makes any sense. glibc has this complicated mechanism with RPATH and RUNPATH that controls whether RPATH is processed before or after LD_LIBRARY_PATH, presumably to support legacy binaries, but there is no compelling reason to support this, and better behavior is obtained by just fixing the search order.
* provide useless 64-bit fcntl macros with _LARGEFILE64_SOURCERich Felker2013-08-021-0/+3
| | | | | this is all useless but part of the API, which is part of the _GNU_SOURCE API, so something may need them.
* if map_library has allocated a buffer for phdrs, free it on success tooRich Felker2013-08-021-0/+1
| | | | this fixes an oversight in the previous commit.
* improve error handling in map_library and support long phdrsRich Felker2013-08-021-12/+21
| | | | | | | previously, errno could be meaningless when the caller wrote it to the dlerror string or stderr. try to make it meaningful. also, fix incorrect check for over-long program headers and instead actually support them by allocating memory if needed.
* fix uninitialized dyn variable in map_libraryRich Felker2013-08-021-1/+1
| | | | | this can only happen for invalid library files, but they were not detected reliably because the variable was uninitialized.
* fix (deprecated) mktemp logic and update it to match other temp functionsRich Felker2013-08-021-4/+11
| | | | | | | | the access function cannot be used to check for existence, because it operates using real uid/gid rather than effective to determine accessibility; this matters for the non-final path components. instead, use stat. failure of stat is success if only the final component is missing (ENOENT) and otherwise is failure.
* remove (no longer useful) namespace-protected __mktemp symbolRich Felker2013-08-021-4/+1
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* make mkdtemp and mkstemp family leave template unchanged on failRich Felker2013-08-022-13/+18
| | | | | | also refactor mkdtemp based on new shared temp code, removing dependency on the deprecated mktemp, whose behavior made this logic more difficult.
* optimized memset asm for i386 and x86_64Rich Felker2013-08-012-0/+88
| | | | | | | | | | | | | | | | | | | | the concept of both versions is the same; they differ only in details. for long runs, they use "rep movsl" or "rep movsq", and for small runs, they use a trick, writing from both ends towards the middle, that reduces the number of branches needed. in addition, if memset is called multiple times with the same length, all branches will be predicted; there are no loops. for larger runs, there are likely faster approaches than "rep", at least on some cpu models. for 32-bit, it's unlikely that there is any faster approach that does not require non-baseline instructions; doing anything fancier would require inspecting cpu capabilities. for 64-bit, there may very well be faster versions that work on all models; further optimization could be explored in the future. with these changes, memset is anywhere between 50% faster and 6 times faster, depending on the cpu model and the length and alignment of the destination buffer.
* work around gcc 4.8's generation of self-referential mem* functions at -O3Rich Felker2013-08-012-0/+13
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* in pthread_getattr_np, use mremap rather than madvise to measure stackRich Felker2013-07-311-1/+2
| | | | | | | | | | | the original motivation for this patch was that qemu (and possibly other syscall emulators) nop out madvise, resulting in an infinite loop. however, there is another benefit to this change: madvise may actually undo an explicit madvise the application intended for its stack, whereas the mremap operation is a true nop. the logic here is that mremap must fail if it cannot resize the mapping in-place, and the caller knows that it cannot resize in-place because it knows the next page of virtual memory is already occupied.
* fix theoretical out-of-bound access in dynamic linkerRich Felker2013-07-311-1/+1
| | | | | | | | one of the arguments to memcmp may be shorter than the length l-3, and memcmp is under no obligation not to access past the first byte that differs. instead use strncmp which conveys the correct semantics. the performance difference is negligible here and since the code is only use for shared libc, both functions are already linked anyway.
* prevent passing PT_INTERP name to dlopen from double-loading libcRich Felker2013-07-311-6/+11
| | | | | | | | | | | | | the dev/inode for the main app and the dynamic linker ("interpreter") are not available, so the subsequent checks don't work. in general we don't want to make exact string matches to existing libraries prevent loading new ones, since this breaks loading upgraded modules in module-loading systems. so instead, special-case it. the motivation for this fix is that calling dlopen on the names returned by dl_iterate_phdr or walking the link map (obtained by dlinfo) seem to be the only methods available to an application to actually get a list of open dso handles.
* add some sanity checks in dynamic loader codeRich Felker2013-07-311-0/+10
| | | | | | | | reject elf files which are not ET_EXEC/ET_DYN type as bad exec format, and reject ET_EXEC files when they cannot be loaded at the correct address, since they are not relocatable at runtime. the main practical benefit of this is to make dlopen of the main program fail rather than producing an unsafe-to-use handle.
* fix bug where read error was treated as success reading library headersRich Felker2013-07-311-1/+1
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* don't call null pointer if DT_INIT/DT_FINI are nullRich Felker2013-07-311-2/+2
| | | | | | | | it's not clear to me why the linker even outputs these headers if they are null, but apparently it does so. with the default startfiles, they will never be null anyway, but this patch allows eliminating crti, crtn, crtbegin, and crtend (leaving only crt1) if the toolchain is using init_array/fini_array (or for a C-only, no-ctor environment).
* add macros for new(ish) prctl commandsRich Felker2013-07-301-0/+37
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* fix some prctl macros that were incorrectly copied into this fileRich Felker2013-07-301-3/+3
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* use separate sigaction buffers for old and new dataTimo Teräs2013-07-302-8/+8
| | | | | | in signal() it is needed since __sigaction uses restrict in parameters and sharing the buffer is technically an aliasing error. do the same for the syscall, as at least qemu-user does not handle it properly.
* release notes for 0.9.12 v0.9.12Rich Felker2013-07-291-0/+39
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* add missing erfcl wrapper for archs where long double is plain doubleRich Felker2013-07-281-0/+4
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* fix semantically incorrect use of LC_GLOBAL_LOCALERich Felker2013-07-287-7/+7
| | | | | | | | | | | | | LC_GLOBAL_LOCALE refers to the global locale, controlled by setlocale, not the thread-local locale in effect which these functions should be using. neither LC_GLOBAL_LOCALE nor 0 has an argument to the *_l functions has behavior defined by the standard, but 0 is a more logical choice for requesting the callee to lookup the current locale. in the future I may move the current locale lookup the the caller (the non-_l-suffixed wrapper). at this point, all of the locale logic is dummied out, so no harm was done, but it should at least avoid misleading usage.
* fix indention-with-spacesRich Felker2013-07-271-1/+1
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* reorder strftime to eliminate the incorrect indention levelRich Felker2013-07-271-5/+5
| | | | | this change is in preparation for possibly adding support for the field width and padding specifiers added in POSIX 2008.
* add wrapper headers, with warnings, for various incorrect names under sysRich Felker2013-07-276-0/+11
| | | | | | | also add a warning to the existing sys/poll.h. the warning is absent from sys/dir.h because it is actually providing a slightly different API to the program, and thus just replacing the #include directive is not a valid fix to programs using this one.
* a few more fixes for unistd/sysconf feature reportingRich Felker2013-07-272-7/+8
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* report presence of ADV and MSG options in unistd.h and sysconfRich Felker2013-07-262-2/+4
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* report that posix_spawn is supported in unistd.h and sysconfRich Felker2013-07-262-1/+2
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* add ABI symbols for strtol family functionsRich Felker2013-07-261-0/+8
| | | | | these odd names are actually generated by mess in glibc's stdlib.h, so any glibc-linked program using strtol needs them to run against musl.
* make ldd report the libc/dynamic linker itselfRich Felker2013-07-261-0/+22
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* fix computation of entry point and main app phdrs when invoking via ldsoRich Felker2013-07-261-3/+1
| | | | | | | | | | | entry point was wrong for PIE. e_entry was being treated as an absolute value, whereas it's actually relative to the load address (which is zero for non-PIE). phdr pointer was wrong for non-PIE. e_phoff was being treated as load-address-relative, whereas it's actually a file offset in the ELF file. in any case, map_library was already computing it correctly, and the incorrect code in __dynlink was overwriting it with junk.
* fix powerpc build breakage from dynamic linker path search changesRich Felker2013-07-261-1/+1
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* new mostly-C crt1 implementationRich Felker2013-07-269-0/+96
| | | | | | | | | | | | | | | the only immediate effect of this commit is enabling PIE support on some archs that did not previously have any Scrt1.s, since the existing asm files for crt1 override this C code. so some of the crt_arch.h files committed are only there for the sake of documenting what their archs "would do" if they used the new C-based crt1. the expectation is that new archs should use this new system rather than using heavy asm for crt1. aside from being easier and less error-prone, it also ensures that PIE support is available immediately (since Scrt1.o is generated from the same C source, using -fPIC) rather than having to be added as an afterthought in the porting process.
* fix undefined strcpy call in inet_ntopRich Felker2013-07-251-1/+1
| | | | | source and dest arguments for strcpy cannot overlap, so memmove must be used here. the length is already known from the above loop.
* make inet_ntop format v4-mapped ipv6 addresses properlyRich Felker2013-07-251-8/+14
| | | | | | | | | | | | | | based on a patch by orc. POSIX actually fails to specify the format of the ntop conversion; presumably, any output that will correctly round-trip back via the (well-specified) pton operation is acceptable. the new behavior is much more convenient than the old, however. this patch also affects getnameinfo, which is implemented in terms of inet_ntop and which is the preferred interface for performing this conversion. I've also removed some inexplicable cruft (filling the buffer with 'x' before doing anything) whose origin I was unable to track down.
* do not include math modules in the default -O3 optimization setRich Felker2013-07-241-1/+1
| | | | | | it's not clear that -O3 helps them, and gcc seems to have floating point optimization bugs that introduce additional failures when -O3 is used on some of these files.
* fix incorrect type for new si_call_addr in siginfo_tRich Felker2013-07-241-3/+3
| | | | | | | | | | apparently the original kernel commit's i386 version of siginfo.h defined this field as unsigned int, but the asm-generic file always had void *. unsigned int is obviously not a suitable type for an address, in a non-arch-specific file, and glibc also has void * here, so I think void * is the right type for it. also fix redundant type specifiers.
* add protocol families PF_IB and PF_VSOCK to socket.hSzabolcs Nagy2013-07-251-1/+5
| | | | | | | | linux commit 8d36eb01da5d371feffa280e501377b5c450f5a5 (2013-05-29) added PF_IB for InfiniBand linux commit d021c344051af91f42c5ba9fdedc176740cbd238 (2013-02-06) added PF_VSOCK for VMware sockets
* update siginfo according to linux headersSzabolcs Nagy2013-07-241-1/+13
| | | | | | | | linux commit a0727e8ce513fe6890416da960181ceb10fbfae6 (2012-04-12) added siginfo fields for SIGSYS (seccomp uses it) linux commit ad5fa913991e9e0f122b021e882b0d50051fbdbc (2009-09-16) added siginfo field and si_code values for SIGBUS (hwpoison signal)
* rework langinfo code for ABI compat and for use by time codeRich Felker2013-07-244-17/+17
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* update strxfrm/wcsxfrm for future LC_COLLATE support and ABI compatRich Felker2013-07-244-14/+20
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* add ABI compat aliases for a number of locale_t functionsRich Felker2013-07-248-0/+24
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* add PTRACE_PEEKSIGINFO to ptrace.hSzabolcs Nagy2013-07-241-0/+11
| | | | | added in linux-v3.10 commit 84c751bd4aebbaae995fe32279d3dba48327bad4 using stdint.h types for the new ptrace_peeksiginfo_args struct
* add if_ether.h constants ETH_P_802_3_MIN and ETH_P_BATMANSzabolcs Nagy2013-07-241-0/+3
| | | | | see linux commits 4f99ad51292078cc47343c17d3870764588cff73 and e5c5d22e8dcf7c2d430336cbf8e180bd38e8daf1
* add CLOCK_TAI (and CLOCK_SGI_CYCLE) clock ids to time.hSzabolcs Nagy2013-07-241-0/+2
| | | | added in linux-v3.10 commit 1ff3c9677bff7e468e0c487d0ffefe4e901d33f4
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