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2022-08-26dns: fail if ipv6 is disabled and resolv.conf has only v6 nameservesRich Felker1-0/+5
if resolv.conf lists no nameservers at all, the default of 127.0.0.1 is used. however, another "no nameservers" case arises where the system has ipv6 support disabled/configured-out and resolv.conf only contains v6 nameservers. this caused the resolver to repeat socket operations that will necessarily fail (sending to one or more wrong-family addresses) while waiting for a timeout. it would be contrary to configured intent to query 127.0.0.1 in this case, but the current behavior is not conducive to diagnosing the configuration problem. instead, fail immediately with EAI_SYSTEM and errno==EAFNOSUPPORT so that the configuration error is reportable.
2022-08-26use kernel-provided AT_MINSIGSTKSZ for sysconf(_SC_[MIN]SIGSTKSZ)Rich Felker1-2/+12
use the legacy constant values if the kernel does not provide AT_MINSIGSTKSZ (__getauxval will return 0 in this case) and as a safety check if something is wrong and the provided value is less than the legacy constant. sysconf(_SC_SIGSTKSZ) returns SIGSTKSZ adjusted for the difference between the legacy constant MINSIGSTKSZ and the runtime value, so that the working space the application has on top of the minimum remains invariant under changes to the minimum.
2022-08-26add sysconf keys/values for signal stack sizeRich Felker2-0/+5
as a result of ISA extensions exploding register file sizes on some archs, using a constant for minimum signal stack size no longer seems viably future-proof. add sysconf keys allowing the kernel to provide a machine-dependent minimum applications can query to ensure they allocate sufficient space for stacks. the key names and indices align with the same functionality in glibc. see commit d5a5045382315e36588ca225889baa36ed0ed38f for previous action on this subject. ultimately, the macros MINSIGSTKSZ and SIGSTKSZ probably need to be deprecated, but that is standards-amendment work outside the scope of a single implementation.
2022-08-24fix fallback when ipv6 is disabled but resolv.conf has v6 nameservesRich Felker1-1/+2
apparently this code path was never tested, as it's not usual to have v6 nameservers listed on a system without v6 networking support. but it was always intended to work. when reverting to binding a v4 address, also revert the family in the sockaddr structure and the socklen for it. otherwise bind will just fail due to mismatched family/sockaddr size. fix dns resolver fallback when v6 nameservers are listed by
2022-08-24epoll_create: fail with EINVAL if size is non-positiveKristina Martsenko1-0/+1
This is a part of the interface contract defined in the Linux man page (official for a Linux-specific interface) and asserted by test cases in the Linux Test Project (LTP).
2022-08-20use alt signal stack when present for implementation-internal signalsRich Felker3-3/+3
a request for this behavior has been open for a long time. the motivation is that application code, particularly under some language runtimes designed around very-low-footprint coroutine type constructs, may be operating with extremely small stack sizes unsuitable for receiving signals, using a separate signal stack for any signals it might handle. progress on this was blocked at one point trying to determine whether the implementation is actually entitled to clobber the alt stack, but the phrasing "available to the implementation" in the POSIX spec for sigaltstack seems to make it clear that the application cannot rely on the contents of this memory to be preserved in the absence of signal delivery (on the abstract machine, excluding implementation-internal signals) and that we can therefore use it for delivery of signals that "don't exist" on the abstract machine. no change is made for SIGTIMER since it is always blocked when used, and accepted via sigwaitinfo rather than execution of the signal handler.
2022-08-17ldso: make exit condition clearer in fixup_rpathÉrico Nogueira1-1/+1
breaking out of the switch-case when l==-1 means the conditional below will necessarily be true (-1 >= buf_size, a size_t variable) and the function will return 0. it is, however, somewhat unclear that that's what's happening. simply returning there is simpler
2022-08-17freopen: reset stream orientation (byte/wide) and encoding ruleRich Felker1-0/+2
this is a requirement of the C language (orientation) and POSIX (encoding rule) that was somehow overlooked. we rely on the fact that the buffer pointers have been reset by fflush, so that any future stdio operations on the stream will go through the same code paths they would on a newly-opened file without an orientation set, thereby setting the orientation as they should.
2022-08-02ldso: process RELR only for non-FDPIC archsRich Felker1-1/+2
the way RELR is applied is not a meaningful operation for FDPIC (there is no single "base" address). it seems unlikely RELR would ever be added for FDPIC, but if it ever is, the behavior and possibly data format will need to be different, so guard against calling the non-FDPIC code.
2022-08-02ldso: support DT_RELR relative relocation formatFangrui Song3-4/+27
this resolves DT_RELR relocations in non-ldso, dynamic-linked objects.
2022-08-02use syscall_arg_t and __scc macro for arguments to __alt_socketcallAlex Xu (Hello71)1-3/+3
otherwise, pointer arguments are sign-extended on x32, resulting in EFAULT.
2022-08-01fix strings.h feature test macro usage due to missing features.hMichael Pratt1-0/+1
2022-08-01fix ESRCH error handling for clock_getcpuclockidEugene Yudin1-0/+1
the syscall used to probe availability of the clock fails with EINVAL when the requested pid does not exist, but clock_getcpuclockid is specified to use ESRCH for this purpose.