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2016-01-28add support for search domains to dns resolverRich Felker1-1/+41
search is only performed if the search or domain keyword is used in resolv.conf and the queried name has fewer than ndots dots. there is no default domain and names with >=ndots dots are never subjected to search; failure in the root scope is final. the (non-POSIX) res_search API presently does not honor search. this may be added at some point in the future if needed. resolv.conf is now parsed twice, at two different layers of the code involved. this will be fixed in a subsequent patch.
2016-01-28fix handling of dns response codesRich Felker1-1/+2
rcode of 3 (NxDomain) was treated as a hard EAI_NONAME failure, but it should instead return 0 (no results) so the caller can continue searching. this will be important for adding search domain support. the top-level caller will automatically return EAI_NONAME if there are zero results at the end. also, the case where rcode is 0 (success) but there are no results was not handled. this happens when the domain exists but there are no A or AAAA records for it. in this case a hard EAI_NONAME should be imposed to inhibit further search, since the name was defined and just does not have any address associated with it. previously a misleading hard failure of EAI_FAIL was reported.
2016-01-28fix logic for matching search/domain keywords in resolv.confRich Felker1-1/+1
2016-01-28factor resolv.conf parsing out of res_msend to its own fileRich Felker3-60/+126
this change is made in preparation for adding search domains, for which higher-level code will need to parse resolv.conf. simply parsing it twice for each lookup would be one reasonable option, but the existing parser code was buggy anyway, which suggested to me that it's a bad idea to have two variants of this code in two different places. the old code in res_msend potentially misinterpreted overly long lines in resolv.conf, and stopped parsing after it found 3 nameservers, even if there were relevant options left to be parsed later in the file.
2016-01-28add errno setting to stub utmpxname functionRich Felker1-0/+2
2016-01-28legacy/utmpx: Add utmp{,x}name stubsKylie McClain1-0/+7
2016-01-27deduplicate the bulk of the arch bits headersRich Felker92-3194/+0
all bits headers that were identical for a number of 'clean' archs are moved to the new arch/generic tree. in addition, a few headers that differed only cosmetically from the new generic version are removed. additional deduplication may be possible in mman.h and in several headers (limits.h, posix.h, stdint.h) that mostly depend on whether the arch is 32- or 64-bit, but they are left alone for now because greater gains are likely possible with more invasive changes to header logic, which is beyond the scope of this commit.
2016-01-27add arch/generic include fallback to build rulesRich Felker2-4/+9
this sets the stage for the first phase of the bits deduplication. bits headers which are identical for "most" archs will be moved to arch/generic/bits.
2016-01-27remove unneeded -I options from configure test for may_alias attributeRich Felker1-1/+1
this test does not include anything, so the -I options are not useful and are just a maintenance burden if paths change.
2016-01-27mips: add vdso supportHauke Mehrtens1-0/+4
vdso support is available on mips starting with kernel 4.4, see kernel commit a7f4df4e21 "MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime()" for details. In Linux kernel 4.4.0 the mips code returns -ENOSYS in case it can not handle the vdso call and assumes the libc will call the original syscall in this case. Handle this case in musl. Currently Linux kernel 4.4.0 handles the following types: CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_REALTIME and CLOCK_MONOTONIC.
2016-01-27improve clock_gettime and adapt it to support slightly-broken vdsoRich Felker1-22/+39
these changes are motivated by a functionally similar patch by Hauke Mehrtens to address the needs of the new mips vdso clock_gettime, which wrongly fails with ENOSYS rather than falling back to making a syscall for clock ids it cannot handle from userspace. in the process of preparing to handle that case, it was noticed that the old clock_gettime use of the vdso was actually wrong with respect to error handling -- the tail call to the vdso function failed to set errno and instead returned an error code. since tail calls to vdso are no longer possible and since the plain syscall code is now needed as a fallback path anyway, it does not make sense to use a function pointer to call the plain syscall code path. instead, it's inlined at the end of the main clock_gettime function. the new code also avoids the need to test for initialization of the vdso function pointer by statically initializing it to a self-init function, and eliminates redundant loads from the volatile pointer object. finally, the use of a_cas_p on an object of type other than void *, which is not permitted aliasing, is replaced by using an object with the correct type and casting the value.
2016-01-26fix siginfo_t for mipsSzabolcs Nagy2-0/+13
si_errno and si_code are swapped in mips siginfo_t compared to other archs and some si_code values are different. This fix is required for POSIX timers to work. based on patch by Dmitry Ivanov.
2016-01-26move bits/signal.h include close to the top of signal.hSzabolcs Nagy1-6/+12
only have code above the bits/signal.h include that is necessary. (some types are used for the ucontext struct and mips has to override a few macro definitions) this way mips bits/signal.h will be able to affect siginfo_t.
2016-01-26add new PTRACE_SECCOMP_GET_FILTER ptrace commandSzabolcs Nagy1-0/+1
allows the tracer to dump the bpf seccomp filters of the tracee, new in linux v4.4, commit f8e529ed941ba2bbcbf310b575d968159ce7e895
2016-01-26add MCL_ONFAULT and MLOCK_ONFAULT mlockall and mlock2 flagsSzabolcs Nagy11-0/+11
they lock faulted pages into memory (useful when a small part of a large mapped file needs efficient access), new in linux v4.4, commit b0f205c2a3082dd9081f9a94e50658c5fa906ff1 MLOCK_* is not in the POSIX reserved namespace for sys/mman.h
2016-01-26add mlock2 syscall number from linux v4.4Szabolcs Nagy8-0/+16
this is mlock with a flags argument, new in linux commit a8ca5d0ecbdde5cc3d7accacbd69968b0c98764e as usual microblaze and sh don't have allocated syscall number yet.
2016-01-26add new PTRACE_O_SUSPEND_SECCOMP ptrace optionSzabolcs Nagy1-1/+2
allows a ptracer process to disable/enable seccomp filters of the traced process, useful for checkpoint/restore, new in v4.3 commit 13c4a90119d28cfcb6b5bdd820c233b86c2b0237
2016-01-26add new PR_CAP_AMBIENT and related defines to sys/prctl.hSzabolcs Nagy1-0/+6
ambient capability mask is new in linux v4.3, commit 58319057b7847667f0c9585b9de0e8932b0fdb08
2016-01-26update netpacket/packet.h to linux v4.3Szabolcs Nagy1-0/+17
2016-01-26add new membarrier, userfaultfd and switch_endian syscallsSzabolcs Nagy8-0/+34
new in linux v4.3 added for aarch64, arm, i386, mips, or1k, powerpc, x32 and x86_64. membarrier is a system wide memory barrier, moves most of the synchronization cost to one side, new in kernel commit 5b25b13ab08f616efd566347d809b4ece54570d1 userfaultfd is useful for qemu and is new in kernel commit 8d2afd96c20316d112e04d935d9e09150e988397 switch_endian is powerpc only for switching endianness, new in commit 529d235a0e190ded1d21ccc80a73e625ebcad09b
2016-01-26add new i386 socket syscall numbersSzabolcs Nagy1-0/+30
new in linux v4.3 commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb direct calls instead of socketcall allow better seccomp filtering. musl continues to use socketcalls internally on i386. (older kernels would need a fallback mechanism if the direct calls were used.)
2016-01-26change the internal socketcall selection logicSzabolcs Nagy2-1/+3
only use SYS_socketcall if SYSCALL_USE_SOCKETCALL is defined internally, otherwise use direct syscalls. this commit does not change the current behaviour, it is preparation for adding direct syscall numbers for i386.
2016-01-25add ssp suppression to some arch-override files that may need itRich Felker1-2/+4
these were not covered by the parent-level rules with the new build system. in the old build system, the equivalent files were often in arch/$(ARCH)/src and likewise lacked the suppression. this could lead to early crashing (before thread pointer init) when libc itself was built with stack protector enabled.
2016-01-25use same object files for libc.a and libc.so if compiler produces PICRich Felker2-2/+13
now that .lo and .o files differ only by whether -fPIC is passed (and no longer at the source level based on the SHARED macro), it's possible to use the same object files for both static and shared libc when the compiler would produce PIC for the static files anyway. this happens if the user has included -fPIC in their CFLAGS or if the compiler has been configured to produce PIE by default. we use the .lo files for both, and still append -fPIC to the CFLAGS, rather than using the .o files so that libc.so does not break catastrophically if the user later removes -fPIC from CFLAGS in config.mak or on the make command line. this also ensures that we get full -fPIC in case -fpic, -fPIE, or some other lesser-PIC option was passed in CFLAGS.
2016-01-25move dynamic linker to its own top-level directory, ldsoRich Felker5-19/+11
this eliminates the last need for the SHARED macro to control how files in the src tree are compiled. the same code is used for both libc.a and libc.so, with additional code for the dynamic linker (from the new ldso tree) being added to libc.so but not libc.a. separate .o and .lo object files still exist for the src tree, but the only difference is that the .lo files are built as PIC. in the future, if/when we add dlopen support for static-linked programs, much of the code in dynlink.c may be moved back into the src tree, but properly factored into separate source files. in that case, the code in the ldso tree will be reduced to just the dynamic linker entry point, self-relocation, and loading of libraries needed by the main application.
2016-01-25adapt static dl_iterate_phdr not to depend on !defined(SHARED)Rich Felker1-4/+3
like elsewhere, use a weak alias that the dynamic linker will override with a more complete version capable of handling shared libraries.
2016-01-25move static-linked stub dlsym out of dynlink.cRich Felker2-11/+15
the function name is still __-prefixed because it requires an asm wrapper to pass the caller's address in order for RTLD_NEXT to work. since this was the last function in dynlink.c still used for static linking, now the whole file is conditional on SHARED being defined.
2016-01-25move static-linked stub dlopen out of dynlink.cRich Felker2-5/+13
2016-01-25move dlinfo out of dynlink.cRich Felker2-16/+12
2016-01-25move dlclose out of dynlink.c to its own source fileRich Felker2-5/+9
2016-01-25move static-linked stub invalid dso handle checking out of dynlink.cRich Felker2-9/+20
2016-01-25move static/stub version of dladdr out of dynlink.cRich Felker2-9/+6
2016-01-25factor dlerror and error-setting code out of dynlink.cRich Felker2-32/+55
the ultimate goal of this change is to get all code used in libc.a out of dynlink.c, so that the dynamic linker code can be moved to its own tree and object files in the src tree can all be shared between libc.a and libc.so.
2016-01-25fix arm a_crash for big endianRich Felker1-2/+4
contrary to commit 89e149d275a7699a4a5e4c98bab267648f64cbba, big endian arm does need the instruction bytes in big endian order. rather than trying to use a special encoding that works as arm or thumb, simply encode the simplest/canonical undefined instructions dependent on whether __thumb__ is defined.
2016-01-25add native a_crash primitive for armRich Felker1-0/+10
the .byte directive encodes a guaranteed-undefined instruction, the same one Linux fills the kuser helper page with when it's disabled. the udf mnemonic and and .insn directives are not supported by old binutils versions, and larger-than-byte integer directives would produce the wrong output on big-endian.
2016-01-24add new IP_BIND_ADDRESS_NO_PORT and IPPROTO_MPLS to netinet/in.hSzabolcs Nagy1-0/+2
IP_BIND_ADDRESS_NO_PORT is a SOL_IP socket option to delay src port allocation until connect in case src ip is set with bind(port=0). new in linux v4.2, commit 90c337da1524863838658078ec34241f45d8394d IPPROTO_MPLS protocol number for mpls over ip. new in linux v4.2, commit 730fc4371333636a00fed32c587fc1e85c5367e2
2016-01-24update netinet/tcp.h for linux v4.2Szabolcs Nagy1-0/+7
TCP_CC_INFO is a new socket option to get congestion control info without netlink (union tcp_cc_info is in linux/inet_diag.h kernel header). linux commit 6e9250f59ef9efb932c84850cd221f22c2a03c4a TCP_SAVE_SYN, TCP_SAVED_SYN socket options are for saving and getting the SYN headers of passive connections in a server application. linux commit cd8ae85299d54155702a56811b2e035e63064d3d Add new tcpi_* fields to struct tcp_info implementing RFC4898 counters. linux commit 2efd055c53c06b7e89c167c98069bab9afce7e59
2016-01-24add MS_LAZYTIME mount option to sys/mount.hSzabolcs Nagy1-1/+2
new in linux 4.0 commit 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8, used to update atime/mtime/ctime only in memory when possible.
2016-01-24add AF_MPLS (PF_MPLS) address family to socket.hSzabolcs Nagy1-0/+2
new in linux 4.0 commit 0189197f441602acdca3f97750d392a895b778fd.
2016-01-24add MSG_FASTOPEN sendmsg/sendto flag to socket.hSzabolcs Nagy1-0/+1
This was new in linux 3.5 in commit cf60af03ca4e71134206809ea892e49b92a88896, needed for tcp fastopen feature (sending data in TCP SYN packet).
2016-01-24clean powerpc syscall.hSzabolcs Nagy1-24/+0
remove ifdefs for powerpc64.
2016-01-24add missing powerpc specific PROT_SAO memory protection flagSzabolcs Nagy1-0/+1
this flag for strong access ordering was added in linux v2.6.27 commit aba46c5027cb59d98052231b36efcbbde9c77a1d
2016-01-24fix powerpc MCL_* mlockall flags in bits/mman.hSzabolcs Nagy1-2/+2
the definitions didn't match the linux uapi headers.
2016-01-24fix aarch64 atomics to load/store 32bit onlySzabolcs Nagy1-2/+2
a_ll/a_sc inline asm used 64bit register operands (%0) instead of 32bit ones (%w0), this at least broke a_and_64 (which always cleared the top 32bit, leaking memory in malloc).
2016-01-23improve aarch64 atomicsRich Felker1-16/+36
aarch64 provides ll/sc variants with acquire/release memory order, freeing us from the need to have full barriers both before and after the ll/sc operation. previously they were not used because the a_cas can fail without performing a_sc, in which case half of the barrier would be omitted. instead, define a custom version of a_cas for aarch64 which uses a_barrier explicitly when aborting the cas operation. aside from cas, other operations built on top of ll/sc are not affected since they never abort but rather loop until they succeed. a split ll/sc version of the pointer-sized a_cas_p is also introduced using the same technique. patch by Szabolcs Nagy.
2016-01-22add arch/abi info to dynamic linker's id/version outputRich Felker1-1/+1
2016-01-22remove arch/$(ARCH)/src from the build systemRich Felker1-1/+1
the files that used to come from extra src dirs under the arch dir have all been removed or moved to appropriate places under the main src tree.
2016-01-22remove sh port's __fpscr_values source fileRich Felker1-5/+0
commit f3ddd173806fd5c60b3f034528ca24542aecc5b9, the dynamic linker bootstrap overhaul, silently disabled the definition of __fpscr_values in this file since libc.so's copy of __fpscr_values now comes from crt_arch.h, the same place the public definition in the main program's crt1.o ultimately comes from. remove this file which is no longer in use.
2016-01-22move sh port's __shcall internal function from arch/sh/src to src treeRich Felker1-0/+0
2016-01-22move sh __unmapself code from arch/sh/src to main src treeRich Felker2-1/+1
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