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* disable legacy init/fini processing on ARMRich Felker2013-07-222-0/+6
| | | | | | | | | | | since the old, poorly-thought-out musl approach to init/fini arrays on ARM (when it was the only arch that needed them) was to put the code in crti/crtn and have the legacy _init/_fini code run the arrays, adding proper init/fini array support caused the arrays to get processed twice on ARM. I'm not sure skipping legacy init/fini processing is the best solution to the problem, but it works, and it shouldn't break anything since the legacy init/fini system was never used for ARM EABI.
* make pthread_key_t unsigned to match ABIRich Felker2013-07-221-1/+1
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* make pthread attribute types structs, even when they just have one fieldRich Felker2013-07-2212-25/+25
| | | | | this change is to get the right tags for C++ ABI matching. it should have no other effects.
* change wint_t to unsignedRich Felker2013-07-229-10/+10
| | | | | | | | | | | | aside from the obvious C++ ABI purpose for this change, it also brings musl into alignment with the compiler's idea of the definition of wint_t (use in -Wformat), and makes the situation less awkward on ARM, where wchar_t is unsigned. internal code using wint_t and WEOF was checked against this change, and while a few cases of storing WEOF into wchar_t were found, they all seem to operate properly with the natural conversion from unsigned to signed.
* refactor headers, especially alltypes.h, and improve C++ ABI compatRich Felker2013-07-2241-907/+335
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | the arch-specific bits/alltypes.h.sh has been replaced with a generic alltypes.h.in and minimal arch-specific bits/alltypes.h.in. this commit is intended to have no functional changes except: - exposing additional symbols that POSIX allows but does not require - changing the C++ name mangling for some types - fixing the signedness of blksize_t on powerpc (POSIX requires signed) - fixing the limit macros for sig_atomic_t on x86_64 - making dev_t an unsigned type (ABI matching goal, and more logical) in addition, some types that were wrongly defined with long on 32-bit archs were changed to int, and vice versa; this change is non-functional except for the possibility of making pointer types mismatch, and only affects programs that were using them incorrectly, and only at build-time, not runtime. the following changes were made in the interest of moving non-arch-specific types out of the alltypes system and into the headers they're associated with, and also will tend to improve application compatibility: - netdb.h now includes netinet/in.h (for socklen_t and uint32_t) - netinet/in.h now includes sys/socket.h and inttypes.h - sys/resource.h now includes sys/time.h (for struct timeval) - sys/wait.h now includes signal.h (for siginfo_t) - langinfo.h now includes nl_types.h (for nl_item) for the types in stdint.h: - types which are of no interest to other headers were moved out of the alltypes system. - fast types for 8- and 64-bit are hard-coded (at least for now); only the 16- and 32-bit ones have reason to vary by arch. and the following types have been changed for C++ ABI purposes; - mbstate_t now has a struct tag, __mbstate_t - FILE's struct tag has been changed to _IO_FILE - DIR's struct tag has been changed to __dirstream - locale_t's struct tag has been changed to __locale_struct - pthread_t is defined as unsigned long in C++ mode only - fpos_t now has a struct tag, _G_fpos64_t - fsid_t's struct tag has been changed to __fsid_t - idtype_t has been made an enum type (also required by POSIX) - nl_catd has been changed from long to void * - siginfo_t's struct tag has been removed - sigset_t's has been given a struct tag, __sigset_t - stack_t has been given a struct tag, sigaltstack - suseconds_t has been changed to long on 32-bit archs - [u]intptr_t have been changed from long to int rank on 32-bit archs - dev_t has been made unsigned summary of tests that have been performed against these changes: - nsz's libc-test (diff -u before and after) - C++ ABI check symbol dump (diff -u before, after, glibc) - grepped for __NEED, made sure types needed are still in alltypes - built gcc 3.4.6
* remove init/fini array asm from arm crti/crtn filesRich Felker2013-07-212-44/+4
| | | | | this code has been replaced by portable C code that works on all archs. the old asm needs to be removed or ctors/dtors will run twice.
* remove __libc_csu_* cruftRich Felker2013-07-212-10/+0
| | | | | | | these functions were mistakenly assumed to be needed to match glibc ABI, but glibc has them as part of the non-shared part of libc that's always statically linked into the main program. moreover, the only place they are referenced from is glibc's crt1.o.
* add support for init/fini array in main program, and greatly simplifyRich Felker2013-07-214-26/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | modern (4.7.x and later) gcc uses init/fini arrays, rather than the legacy _init/_fini function pasting and crtbegin/crtend ctors/dtors system, on most or all archs. some archs had already switched a long time ago. without following this change, global ctors/dtors will cease to work under musl when building with new gcc versions. the most surprising part of this patch is that it actually reduces the size of the init code, for both static and shared libc. this is achieved by (1) unifying the handling main program and shared libraries in the dynamic linker, and (2) eliminating the glibc-inspired rube goldberg machine for passing around init and fini function pointers. to clarify, some background: the function signature for __libc_start_main was based on glibc, as part of the original goal of being able to run some glibc-linked binaries. it worked by having the crt1 code, which is linked into every application, static or dynamic, obtain and pass pointers to the init and fini functions, which __libc_start_main is then responsible for using and recording for later use, as necessary. however, in neither the static-linked nor dynamic-linked case do we actually need crt1.o's help. with dynamic linking, all the pointers are available in the _DYNAMIC block. with static linking, it's safe to simply access the _init/_fini and __init_array_start, etc. symbols directly. obviously changing the __libc_start_main function signature in an incompatible way would break both old musl-linked programs and glibc-linked programs, so let's not do that. instead, the function can just ignore the information it doesn't need. new archs need not even provide the useless args in their versions of crt1.o. existing archs should continue to provide it as long as there is an interest in having newly-linked applications be able to run on old versions of musl; at some point in the future, this support can be removed.
* fix order of fini_array execution for shared libsRich Felker2013-07-211-2/+2
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* add support for init_array/fini_array ctors/dtors to dynamic linkerRich Felker2013-07-201-2/+13
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* fix shm_open wrongly being cancellableRich Felker2013-07-201-1/+6
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* fix uninitialized/stale use of alloc (%m modifier) flag in scanfRich Felker2013-07-202-0/+4
| | | | | | | | | for conversion specifiers, alloc is always set when the specifier is parsed. however, if scanf stops due to mismatching literal text, either an uninitialized (if no conversions have been performed yet) or stale (from the previous conversion) of the flag will be used, possibly causing an invalid pointer to be passed to free when the function returns.
* harden realloc/free to detect simple overflowsRich Felker2013-07-191-0/+6
| | | | | | | | | | | the sizes in the header and footer for a chunk should always match. if they don't, the program has definitely invoked undefined behavior, and the most likely cause is a simple overflow, either of a buffer in the block being freed or the one just below it. crashing here should not only improve security of buggy programs, but also aid in debugging, since the crash happens in a context where you have a pointer to the likely-overflowed buffer.
* add UIO_MAXIOV macro in sys/uio.hRich Felker2013-07-191-0/+2
| | | | | | while there's no POSIX namespace provision for UIO_* in uio.h, this exact macro name is reserved in XBD 2.2.2. apparently some glibc-centric software expects it to exist, so let's provide it.
* improve [f]stat[v]fs functions, and possibly work around old kernelsRich Felker2013-07-191-2/+5
| | | | | | | | | | | | | | | | | the main aim of this patch is to ensure that if not all fields are filled in, they contain zeros, so as not to confuse applications. reportedly some older kernels, including commonly used openvz kernels, lack the f_flags field, resulting in applications reading random junk as the mount flags; the common symptom seems to be wrongly considering the filesystem to be mounted read-only and refusing to operate. glibc has some amazingly ugly fallback code to get the mount flags for old kernels, but having them really is not that important anyway; what matters most is not presenting incorrect flags to the application. I have also aimed to fill in some fields of statvfs that were previously missing, and added code to explicitly zero the reserved space at the end of the structure, which will make things easier in the future if this space someday needs to be used.
* change uid_t, gid_t, and id_t to unsigned typesRich Felker2013-07-198-24/+38
| | | | | | | | | this change is both to fix one of the remaining type (and thus C++ ABI) mismatches with glibc/LSB and to allow use of the full range of uid and gid values, if so desired. passwd/group access functions were not prepared to deal with unsigned values, so they too have been fixed with this commit.
* fix invalid C in new trycppif tests in configure scriptRich Felker2013-07-181-1/+2
| | | | | an empty program is not valid and would be reasonable grounds for the compiler to give an error, which would break these tests.
* add build system support for arch endian & float abi variantsRich Felker2013-07-182-1/+33
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* make the dynamic linker find its path file relative to its own locationRich Felker2013-07-187-7/+53
| | | | | | | | | | | | | | | | | | | prior to this change, using a non-default syslibdir was impractical on systems where the ordinary library paths contain musl-incompatible library files. the file containing search paths was always taken from /etc, which would either correspond to a system-wide musl installation, or fail to exist at all, resulting in searching of the default library path. the new search strategy is safe even for suid programs because the pathname used comes from the PT_INTERP header of the program being run, rather than any external input. as part of this change, I have also begun differentiating the names of arch variants that differ by endianness or floating point calling convention. the corresponding changes in the build system and and gcc wrapper script (to use an alternate dynamic linker name) for these configurations have not yet been made.
* fix off-by-one error in checks for implementation-internal signal numbersRich Felker2013-07-183-3/+3
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* fix FILENAME_MAX to match PATH_MAXRich Felker2013-07-181-1/+1
| | | | | | POSIX is not clear on whether it includes the termination, but ISO C requires that it does. the whole concept of this macro is rather useless, but it's better to be correct anyway.
* make spacing in x86_64 alltypes.h.sh more uniform with other archsRich Felker2013-07-171-0/+1
| | | | patch by Luka Perkov, who noted that all other archs have a newline.
* make posix_spawn (and functions that use it) use CLONE_VFORK flagRich Felker2013-07-171-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | this is both a minor scheduling optimization and a workaround for a difficult-to-fix bug in qemu app-level emulation. from the scheduling standpoint, it makes no sense to schedule the parent thread again until the child has exec'd or exited, since the parent will immediately block again waiting for it. on the qemu side, as regular application code running on an underlying libc, qemu cannot make arbitrary clone syscalls itself without confusing the underlying implementation. instead, it breaks them down into either fork-like or pthread_create-like cases. it was treating the code in posix_spawn as pthread_create-like, due to CLONE_VM, which caused horribly wrong behavior: CLONE_FILES broke the synchronization mechanism, CLONE_SIGHAND broke the parent's signals, and CLONE_THREAD caused the child's exec to end the parent -- if it hadn't already crashed. however, qemu special-cases CLONE_VFORK and emulates that with fork, even when CLONE_VM is also specified. this also gives incorrect semantics for code that really needs the memory sharing, but posix_spawn does not make use of the vm sharing except to avoid momentary double commit charge. programs using posix_spawn (including via popen) should now work correctly under qemu app-level emulation.
* fix missing argument in variadic syscall macrosRich Felker2013-07-171-1/+1
| | | | | | for 0-argument syscalls (1 argument to the macro, the syscall number), the __SYSCALL_NARGS_X macro's ... argument was not satisfied. newer compilers seem to care about this.
* fix error code on time conversion overflowsRich Felker2013-07-174-4/+4
| | | | POSIX mandates EOVERFLOW for this condition.
* fix fd leak in file mapping code used in new zoneinfo supportRich Felker2013-07-171-1/+1
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* the big time handling overhaulRich Felker2013-07-1718-348/+649
| | | | | | | | | | this commit has two major user-visible parts: zoneinfo-format time zones are now supported, and overflow handling is intended to be complete in the sense that all functions return a correct result if and only if the result fits in the destination type, and otherwise return an error. also, some noticable bugs in the way DST detection and normalization worked have been fixed, and performance may be better than before, but it has not been tested.
* fix omission of dtv setup in static linked programs on TLS variant I archsRich Felker2013-07-131-1/+1
| | | | | | | | | apparently this was never noticed before because the linker normally optimizes dynamic TLS models to non-dynamic ones when static linking, thus eliminating the calls to __tls_get_addr which crash when the dtv is missing. however, some libsupc++ code on ARM was calling __tls_get_addr when static linked and crashing. the reason is unclear to me, but with this issue fixed it should work now anyway.
* add PIE support for ARMRich Felker2013-07-101-0/+30
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* add some ARM EABI-specific exception handling infrastructureRich Felker2013-07-101-0/+42
| | | | patch by Timo Teräs
* fix invalid library phdr pointers passed to callback from dl_iterate_phdrRich Felker2013-07-101-9/+16
| | | | | | | | | | | | map_library was saving pointers to an automatic-storage buffer rather than pointers into the mapping. this should be a fairly simple fix, but the patch here is slightly complicated by two issues: 1. supporting gratuitously obfuscated ELF files where the program headers are not right at the beginning of the file. 2. cleaning up the map_library function so that data isn't clobbered by the time we need it.
* fix a couple misleading/wrong signal descriptions in strsignalRich Felker2013-07-091-2/+2
| | | | | | | there are still several more that are misleading, but SIGFPE (integer division error misdescribed as floating point) and and SIGCHLD (possibly non-exit status change events described as exiting) were the worst offenders.
* add realtime signals to strsignalRich Felker2013-07-091-3/+19
| | | | | the name format RTnn/RTnnn was chosen to minimized bloat while uniquely identifying the signal.
* fix off-by-one array bound in strsignalRich Felker2013-07-091-1/+1
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* fix bogus lazy allocation in ctermid and missing malloc failure checkRich Felker2013-07-091-10/+7
| | | | | | also clean up, optimize, and simplify the code, removing branches by simply pre-setting the result string to an empty string, which will be preserved if other operations fail.
* fix fd leak on races and cancellation in ctermidRich Felker2013-07-091-2/+3
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* fix missing SOCK_CLOEXEC in various functions that use sockets internallyRich Felker2013-07-094-4/+4
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* add NFDBITS in sys/select.h with appropriate feature testsRich Felker2013-07-061-0/+3
| | | | | | | the main use for this macro seems to be knowing the correct allocation granularity for dynamic-sized fd_set objects. such usage is non-conforming and results in undefined behavior, but it is widespread in applications.
* move core memalign code from aligned_alloc to __memalignRich Felker2013-07-043-49/+55
| | | | | | | | | | | | there are two motivations for this change. one is to avoid gratuitously depending on a C11 symbol for implementing a POSIX function. the other pertains to the documented semantics. C11 does not define any behavior for aligned_alloc when the length argument is not a multiple of the alignment argument. posix_memalign on the other hand places no requirements on the length argument. using __memalign as the implementation of both, rather than trying to implement one in terms of the other when their documented contracts differ, eliminates this confusion.
* move alignment check from aligned_alloc to posix_memalignRich Felker2013-07-042-1/+2
| | | | | | | | C11 has no requirement that the alignment be a multiple of sizeof(void*), and in fact seems to require any "valid alignment supported by the implementation" to work. since the alignment of char is 1 and thus a valid alignment, an alignment argument of 1 should be accepted.
* add legacy sys/ttydefaults.h headerrofl0r2013-07-031-0/+39
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* add legacy scsi/scsi_ioctl.h headerrofl0r2013-07-031-0/+11
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* paths.h: remove cruftrofl0r2013-07-031-9/+0
| | | | | | a research in debian codesearch and grepping over the pkgsrc directory tree have shown that these macros are all either unused, or defined by programs in case they need them.
* add stubs for additional legacy ether.h functionsRich Felker2013-07-012-3/+18
| | | | | | these would not be expensive to actually implement, but reading /etc/ethers does not sound like a particularly useful feature, so for now I'm leaving them as stubs.
* fix Makefile so "make install" works before include/bits symlink existsRich Felker2013-07-011-1/+5
| | | | | | | | | | | | | | | | | | | previously, determination of the list of header files for installation depended on the include/bits symlink (to the arch-specific files) already having been created. in other words, running "make install" immediately after configure without first running "make" caused the bits headers not to be installed. the solution I have applied is to pull the list of headers directly from arch/$(ARCH)/bits rather than include/bits, and likewise to install directly from arch/$(ARCH)/bits rather than via the symlink. at this point, the only purpose served by keeping the symlink around is that it enables use of the in-tree headers and libs directly via -I and -L, which can be useful when testing against a new version of the library before installing it. on the other hand, removing the bits symlink would be beneficial if we ever want to support building multiple archs in the same source tree.
* release notes for 0.9.11 v0.9.11Rich Felker2013-06-291-0/+43
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* fix failure of mbsrtowcs to record stop position when dest is fullRich Felker2013-06-291-1/+4
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* fix shifts possibly larger than type in major() macroRich Felker2013-06-291-1/+1
| | | | | | | | in theory this should not be an issue, since major() should only be applied to type dev_t, which is 64-bit. however, it appears some applications are not using dev_t but a smaller integer type (which works on Linux because the kernel's dev_t is really only 32-bit). to avoid the undefined behavior, do it as two shifts.
* implement minimal dlinfo functionRich Felker2013-06-293-0/+23
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* add some comments about the mips ksigaction structure weirdnessRich Felker2013-06-292-0/+6
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