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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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* fix missing synchronization in calls from dynamic linker to global ctorsRich Felker2013-06-291-0/+4
| | | | | | | | | | | | | this change is needed to correctly handle the case where a constructor creates a new thread which calls dlopen. previously, the lock was not held in this case. the reason for the complex logic to avoid locking whenever possible is that, since the mutex is recursive, it will need to inspect the thread pointer to get the current thread's tid, and this requires initializing the thread pointer. we do not want non-multi-threaded programs to attempt to access the thread pointer unnecessarily; doing so could make them crash on ancient kernels that don't support threads but which may otherwise be capable of running the program.
* prevent shmget from allocating objects that overflow ptrdiff_tRich Felker2013-06-291-0/+2
| | | | | | | | | | | rather than returning an error, we have to increase the size argument so high that the kernel will have no choice but to fail. this is because POSIX only permits the EINVAL error for size errors when a new shared memory segment would be created; if it already exists, the size argument must be ignored. unfortunately Linux is non-conforming in this regard, but I want to keep the code correct in userspace anyway so that if/when Linux is fixed, the behavior applications see will be conforming.
* work around wrong kernel type for sem_nsems member of struct semid_dsRich Felker2013-06-282-1/+16
| | | | | | | | | | rejecting invalid values for n is fine even in the case where a new sem will not be created, since the kernel does its range checks on n even in this case as well. by default, the kernel will bound the limit well below USHRT_MAX anyway, but it's presumably possible that an administrator could override this limit and break things.
* add missing type shmatt_t in sys/shm.hRich Felker2013-06-281-0/+2
| | | | | | | this type is not really intended to be used; it's just there to allow implementations to choose the type for the shm_nattch member of struct shmid_sh, presumably since historical implementations disagreed on the type. in any case, it needs to be there, so now it is.
* implement week-based-year year numbers in strftimeRich Felker2013-06-281-27/+34
| | | | | | in the process, I refactored the week-number code so it can be used by the week-based-year formats to determine year adjustments at the boundary values. this also improves indention/code readability.
* fix breakage in last commit to strftime due to missing INT_MAXRich Felker2013-06-281-0/+1
| | | | | that's what I get for changing a hard-coded threshold to a proper non-magic-number without testing.
* implement week numbers and half of the week-based-year logic for strftimeRich Felker2013-06-281-3/+38
| | | | | | | | | output for plain week numbers (%U and %W) has been sanity-checked, and output for the week-based-year week numbers (%V) has been checked extensively against known-good data for the full non-negative range of 32-bit time_t. year numbers for week-based years (%g and %G) are not yet implemented.
* minor compatibility fixes in utmp.h and fixing mismatch with paths.hRich Felker2013-06-272-4/+10
| | | | | | | the pathnames prefixed with /dev/null/ are guaranteed never to be valid. the previous use of /dev/null alone was mildly dangerous in that bad software might attempt to unlink the name when it found a non-regular file there and create a new file.
* disallow creation of objects larger than PTRDIFF_MAX via mmapRich Felker2013-06-271-0/+5
| | | | | | | | | | | | | | internally, other parts of the library assume sizes don't overflow ssize_t and/or ptrdiff_t, and the way this assumption is made valid is by preventing creating of such large objects. malloc already does so, but the check was missing from mmap. this is also a quality of implementation issue: even if the implementation internally could handle such objects, applications could inadvertently invoke undefined behavior by subtracting pointers within an object. it is very difficult to guard against this in applications, so a good implementation should simply ensure that it does not happen.
* fix syscall argument bug in pthread_getschedparamRich Felker2013-06-261-1/+1
| | | | | the address of the pointer to the sched param, rather than the pointer, was being passed to the kernel.
* fix temp file leak in sem_open on successful creation of new semaphoreRich Felker2013-06-261-2/+2
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* fix bug whereby sem_open leaked its own internal slots on failureRich Felker2013-06-261-3/+6
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* in sem_open, don't leak vm mapping if fstat failsRich Felker2013-06-261-2/+2
| | | | | fstat should not fail under normal circumstances, so this fix is mostly theoretical.
* fix failure of pthread_setschedparam to pass correct param to kernelRich Felker2013-06-261-1/+1
| | | | | the address of the pointer, rather than the pointer, was being passed. this was probably a copy-and-paste error from corresponding get code.
* document in sysconf and unistd.h that per-thread cpu clocks existRich Felker2013-06-262-1/+2
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* fix iconv conversion to legacy 8bit codepagesRich Felker2013-06-261-2/+2
| | | | | this seems to have been a simple copy-and-paste error from the code for converting from legacy codepages.
* remove useless conditional before free from dynamic linker path codeRich Felker2013-06-261-1/+1
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* fix dynamic linker handling of empty path file or error reading path fileRich Felker2013-06-261-4/+3
| | | | | | | | | | | | | previously, the path string was being used despite being invalid. with this change, empty path file or error reading the path file is treated as an empty path. this is preferable to falling back to a default path, so that attacks to prevent reading of the path file could not result in loading incorrect and possibly dangerous (outdated or mismatching ABI) libraries from. the code to strip the final newline has also been removed; now that newline is accepted as a delimiter, it's harmless to leave it in place.
* respect iso c namespace in stdio.h and wchar.h regarding va_listRich Felker2013-06-258-17/+26
| | | | | | | | | | despite declaring functions that take arguments of type va_list, these headers are not permitted by the c standard to expose the definition of va_list, so an alias for the type must be used. the name __isoc_va_list was chosen to convey that the purpose of this alternate name is for iso c conformance, and to avoid the multitude of names which gcc mangles with its hideous "fixincludes" monstrosity, leading to serious header breakage if these "fixes" are run.
* make newline-delimited dynamic linker path file actually workRich Felker2013-06-251-1/+1
| | | | | | | apparently the original commit was never tested properly, since getline was only ever reading one line. the intent was to read the entire file, so use getdelim with the null byte as delimiter as a cheap way to read a whole file into memory.