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2011-07-30clean up pthread_sigmask/sigprocmask dependency orderRich Felker2-11/+7
it's nicer for the function that doesn't use errno to be independent, and have the other one call it. saves some time and avoids clobbering errno.
2011-07-30fix some bugs in setxid and update setrlimit to use __synccallRich Felker2-10/+33
setrlimit is supposed to be per-process, not per-thread, but again linux gets it wrong. work around this in userspace. not only is it needed for correctness; setxid also depends on the resource limits for all threads being the same to avoid situations where temporarily unlimiting the limit succeeds in some threads but fails in others.
2011-07-30add proper fuxed-based locking for stdioRich Felker20-46/+71
previously, stdio used spinlocks, which would be unacceptable if we ever add support for thread priorities, and which yielded pathologically bad performance if an application attempted to use flockfile on a key file as a major/primary locking mechanism. i had held off on making this change for fear that it would hurt performance in the non-threaded case, but actually support for recursive locking had already inflicted that cost. by having the internal locking functions store a flag indicating whether they need to perform unlocking, rather than using the actual recursive lock counter, i was able to combine the conditionals at unlock time, eliminating any additional cost, and also avoid a nasty corner case where a huge number of calls to ftrylockfile could cause deadlock later at the point of internal locking. this commit also fixes some issues with usage of pthread_self conflicting with __attribute__((const)) which resulted in crashes with some compiler versions/optimizations, mainly in flockfile prior to pthread_create.
2011-07-30eliminate dependence of perror on printfRich Felker1-10/+5
2011-07-30fix bug in synccall with no threads: lock was taken but never releasedRich Felker1-4/+4
2011-07-29add setxid.c for new set*id() framework. missed in last commit.Rich Felker1-0/+49
2011-07-29new attempt at making set*id() safe and robustRich Felker13-130/+130
changing credentials in a multi-threaded program is extremely difficult on linux because it requires synchronizing the change between all threads, which have their own thread-local credentials on the kernel side. this is further complicated by the fact that changing the real uid can fail due to exceeding RLIMIT_NPROC, making it possible that the syscall will succeed in some threads but fail in others. the old __rsyscall approach being replaced was robust in that it would report failure if any one thread failed, but in this case, the program would be left in an inconsistent state where individual threads might have different uid. (this was not as bad as glibc, which would sometimes even fail to report the failure entirely!) the new approach being committed refuses to change real user id when it cannot temporarily set the rlimit to infinity. this is completely POSIX conformant since POSIX does not require an implementation to allow real-user-id changes for non-privileged processes whatsoever. still, setting the real uid can fail due to memory allocation in the kernel, but this can only happen if there is not already a cached object for the target user. thus, we forcibly serialize the syscalls attempts, and fail the entire operation on the first failure. this *should* lead to an all-or-nothing success/failure result, but it's still fragile and highly dependent on kernel developers not breaking things worse than they're already broken. ideally linux will eventually add a CLONE_USERCRED flag that would give POSIX conformant credential changes without any hacks from userspace, and all of this code would become redundant and could be removed ~10 years down the line when everyone has abandoned the old broken kernels. i'm not holding my breath...
2011-07-28remove ugly prng from mk*temp and just re-poll time on retryRich Felker1-6/+5
2011-07-28eliminate mk*temp dependency on snprintfRich Felker1-3/+4
this helps some tiny programs be even more tiny, and barly increases code size even if both are used.
2011-07-28fix for setenv bogus var argument handlingRich Felker1-1/+1
thanks to mikachu per POSIX: The setenv() function shall fail if: [EINVAL] The name argument is a null pointer, points to an empty string, or points to a string containing an '=' character.
2011-07-25when resolving symbols with only weak defs, use first def, not last defRich Felker1-0/+1
2011-07-25comment non-obvious de bruijn sequence code in int parserRich Felker1-0/+2
2011-07-24fix resolution of weak symbols (hopefully right now) and vdsoRich Felker1-3/+9
2011-07-24workaround for gcc's optimizer breaking dynamic symbol resolutionRich Felker1-1/+2
2011-07-24load vdso, if present, into the dso listRich Felker1-2/+31
2011-07-24const correctness on function pointerRich Felker1-1/+1
2011-07-24simplify dynamic linker startupRich Felker1-23/+17
instead of creating temp dso objects on the stack and moving them to the heap if dlopen/dlsym are used, use static objects to begin with, and just donate them to malloc if we no longer need them.
2011-07-23some preliminaries for vdso clock supportRich Felker3-7/+35
these changes also make it so clock_gettime(CLOCK_REALTIME, &ts) works even on pre-2.6 kernels, emulated via the gettimeofday syscall. there is no cost for the fallback check, as it falls under the error case that already must be checked for storing the error code in errno, but which would normally be hidden inside __syscall_ret.
2011-07-22check for fd exhaustion in forkptyRich Felker1-2/+15
we cannot report failure after forking, so the idea is to ensure prior to fork that fd 0,1,2 exist. this will prevent dup2 from possibly hitting a resource limit and failing in the child process. fcntl rather than dup2 is used prior to forking to avoid race conditions.
2011-07-22incorrect check for open failure in openpty functionRich Felker1-1/+1
-1, not 0, indicates failure
2011-07-21fix errno value when fdopendir is given an invalid file descriptorRich Felker1-1/+4
this resolves an issue reported by Vasiliy Kulikov
2011-07-16ensure in fork that child gets its own new robust mutex listRich Felker1-0/+1
2011-07-16fix logic error in freadRich Felker1-6/+1
fread was calling f->read without checking that the file was in reading mode. this could: 1. crash, if f->read was a null pointer 2. cause unwanted blocking on a terminal already at eof 3. allow reading on a write-only file
2011-07-14fix various bugs in new integer parser frameworkRich Felker5-10/+15
1. my interpretation of subject sequence definition was wrong. adjust parser to conform to the standard. 2. some code for handling tail overflow case was missing (forgot to finish writing it). 3. typo (= instead of ==) caused ERANGE to wrongly behave like EINVAL
2011-07-14fix wcsto[iu]max with high charactersRich Felker2-4/+2
stopping without letting the parser see a stop character prevented getting a result. so treat all high chars as the null character and pass them into the parser. also eliminated ugly tmp var using compound literals.
2011-07-14new restartable integer parsing framework.Rich Felker6-156/+197
this fixes a number of bugs in integer parsing due to lazy haphazard wrapping, as well as some misinterpretations of the standard. the new parser is able to work character-at-a-time or on whole strings, making it easy to support the wide functions without unbounded space for conversion. it will also be possible to update scanf to use the new parser.
2011-07-12gb18030 support in iconv (only from, not to)Rich Felker2-2/+1887
also support (and restrict to subsets) older chinese sets, and explicitly refuse to convert to cjk (since there's no code for it yet)
2011-07-12"implement" getnetbyaddr and getnetbynameRich Felker1-0/+12
these are useless legacy functions but some old software contains cruft that expects them to exist...
2011-07-12legacy japanese charset support in iconv (only from, not to)Rich Felker2-0/+597
2011-07-12simplify iconv and support more legacy codepagesRich Felker3-352/+331
2011-07-04printf: "if a precision is specified, the '0' flag shall be ignored."Rich Felker1-1/+1
2011-07-04zero precision with zero value should not inhibit prefix/width printingRich Felker1-1/+4
2011-07-04printf("%#x",0) should print 0 not 0x0Rich Felker1-1/+1
2011-07-03iconv was not returning -1 on most failureRich Felker1-0/+2
this broke most uses of iconv in real-world programs, especially glib's iconv wrappers.
2011-07-01fix dlopen UB due to longjmp/volatile rules violationRich Felker1-1/+1
2011-06-30res_search symbol, aliased to res_query for now (better than nothing)Rich Felker1-0/+3
2011-06-30simple rpath support (no token expansion yet) for dynamic linkerRich Felker1-2/+8
2011-06-30fix error in previous ld80 fpclassify commitRich Felker1-1/+1
2011-06-30catch invalid ld80 bit patterns and treat them as nanRich Felker1-2/+2
this should not be necessary - the invalid bit patterns cannot be created except through type punning. however, some broken gnu software is passing them to printf and triggering dangerous stack-smashing, so let's catch them anyway...
2011-06-30fix logic in __fwritingRich Felker1-1/+1
2011-06-30add and consolidate nasty stdio_ext junkRich Felker3-17/+57
hopefully this resolves the rest of the issues with hideously nonportable hacks in programs that use gnulib.
2011-06-30implement the nonstandard GNU function fpurgeRich Felker1-0/+11
this is a really ugly and backwards function, but its presence will prevent lots of broken gnulib software from trying to define its own version of fpurge and thereby failing to build or worse.
2011-06-30fix buffer overrun in getgrent code when there are no group membersRich Felker1-4/+8
2011-06-29posix_memalign should fail if size is not a multiple of sizeof(void *)Rich Felker1-1/+1
2011-06-29locking support for random() prngRich Felker1-7/+28
these interfaces are required to be thread-safe even though they are not state-free. the random number sequence is shared across all threads.
2011-06-29work around linux bug in mprotectRich Felker1-1/+5
per POSIX: The mprotect() function shall change the access protections to be that specified by prot for those whole pages containing any part of the address space of the process starting at address addr and continuing for len bytes. on the other hand, linux mprotect fails with EINVAL if the base address and/or length is not page-aligned, so we have to align them before making the syscall.
2011-06-29textrel support, cheap and uglyRich Felker1-0/+5
2011-06-28reclaim the memory wasted by dynamic linking for use by mallocRich Felker1-0/+39
2011-06-28use type directives for fenv asm functionsRich Felker2-0/+14
2011-06-28use load address from elf header if possibleRich Felker1-1/+1
this is mostly useless for shared libs (though it could help for prelink-like purposes); the intended use case is for adding support for calling the dynamic linker directly to run a program, as in: ./libc.so ./a.out foo this usage is not yet supported.
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