Implement socketcall and rawsocketcall in addition to seek (already
introduced in CL 100076) to support compiling with gccgo on linux/386

Change-Id: Iaa51aa159a4743ae0e394f541ff196e2d28aa27f
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The calls to use were removed in CL 36715.

Change-Id: I9f664d57e2595e932d702fdf6318d377e93e428a
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Current versions of gccgo report a redefinition error for both a
declaration and definition, as of https://golang.org/cl/93083.
Fix the last change to work with this.

Change-Id: Iae6a664fcc9fe97d4e3b7845a05dab3a8ad56830
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It uses __get_cpuid_count, provided by cpuid.h.
The xgetbv is implemented after its counterpart in cpu_x86.s.

Change-Id: I97624d7da67ab4ec3c9a53b0bfc4dfcdf7d12c87
Reviewed-on: https://go-review.googlesource.com/116155Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Add a CacheLinePad struct type that has a size of cacheLineSize.
This can be used for padding structs in order to avoid false sharing.

Fixes golang/go#25203

Change-Id: I6b6daf91ea0e9c50428ffa053035429c3921b461
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On some builders TestStatx occassionally fails when comparing atime
between Statx and Stat/Lstat.

--- FAIL: TestStatx (0.00s)
	syscall_linux_test.go:365: Statx: returned stat atime does not match Lstat

Fix it by dropping the atime comparison, it's enough to verify Statx
working correctly by comparing ctime and mtime. Also, not all
filesystems support atime.

Change-Id: I7da68bd20b9b21274c4993aa2c4241395d2c933a
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CL 114518 introduced Nfgenmsg as a type alias which breaks the build on
Go <= 1.9. Fix it by making Nfgenmsg a type like all others in
x/sys/unix

Updates golang/go#25561
Fixes golang/go#25563

Change-Id: I9950be857e34e7e3ca79c71fced9663a0cac9b63
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Change-Id: I55efe06ec81e891ec3872405ba75c7eb9ce4e635
Reviewed-on: https://go-review.googlesource.com/114518Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Like on linux, lsetxattr on symlinks returns EPERM.

Change-Id: I6dfc59484e1826872af54579dd6ec02705c816da
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The mkfifo syscall is disallowed on android and iOS. sched_setaffinity
is disallowed on android. Skip all tests which use them.

/usr/bin does not exist on android. Use /system/bin in TestGetwd
instead, like TestChdirAndGetwd in the os package.

Like linux, android does not support Fchmodat with flags != 0. Adjust
TestFchmodat accordingly.

TestDevices might stat some device files which are not accessible, skip
those.

iOS cannot exec subprocesses, thus skip TestPassFD.

Fixes golang/go#25535

Change-Id: Ic764b9152f0a7b703ad4f47fdb1a9a5e94718154
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Instead, add a small test verify Major, Minor and Mkdev using arbitrary
numbers.

Leave TestDevices on Linux as its major/minor numbers are guaranteed
stable.

Updates golang/go#25528
Updates golang/go#25535

Change-Id: Ic105211660d80f9b3508ca9d518e9fac3b7e3beb
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Fixes golang/go#25485

Change-Id: Ic00df1f86591c00fa88cddcb03c7ced0c6bdb0c1
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Updates golang/go#14456

Change-Id: I04632ef1d302e938a2cc373eb90f600f01404380
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Fixes golang/go#25529

Change-Id: Ifb7060106608fab0c87ce4596c9f16c14bde6205
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The test uses hardcoded numbers specific to one Solaris variant or
version. It's not guaranteed that they are stable over time or
across variants.

Fixes golang/go#25528

Change-Id: I148bd4d8264b802f07a2e886b99e76a40824af35
Reviewed-on: https://go-review.googlesource.com/114092Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
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Based on the tests in github.com/pkg/xattr

Change-Id: I3af73ad538877da042602708248063c218260a2e
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https://storage.googleapis.com/go-build-log/489a6b5c/misc-vet-vetall_c1e51035.log
cmd/vendor/golang.org/x/sys/windows/asm_windows_amd64.s:12: [amd64] loadlibrary: wrong argument size 8; expected $...-24

Change-Id: I02e7c53216e2c55d0d062e50f72984228c214e23
Reviewed-on: https://go-review.googlesource.com/114082Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

It's only when dest is set to NULL that the OS X implementations of
getxattr() and listxattr() return the current sizes of the named
attributes. An empty byte array is not sufficient. To maintain the same
behaviour as the linux implementation, we wrap around the system calls
and pass in NULL when dest is empty.

The parameters for the OS X implementation of setxattr() vary slightly
compared to the linux system call, specifically the 'position'
parameter:

 linux:
     int setxattr(
         const char *path,
         const char *name,
         const void *value,
         size_t size,
         int flags
     );

 darwin:
     int setxattr(
         const char *path,
         const char *name,
         void *value,
         size_t size,
         u_int32_t position,
         int options
     );

'position' specifies the offset within the extended attribute. In the
current implementation, only the resource fork extended attribute makes
use of this argument. For all others, position is reserved.  We simply
default to setting it to zero.  If that's needed by the package user, a
function with a different name needs to be implemented instead.

Similarly for removexattr(), we wrap around and explicitly zero out the
options provided. We do so for interoperability with the linux variant.
If options are needed by the package user, a function with a different
name needs to be implemented instead.

Fixes golang/go#14456

Change-Id: I2581e1fa8dc9324bced7fda7f8ada10fe2ede3f5
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Change-Id: I0a16c77437e4ed68cc19eda41bb9b64ab4376fd0
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CL 112696 changed mkerrors.sh to add filesystem magic constants on
linux. This leads to the unrelated AUDIT_RECORD_MAGIC constant being
added on darwin. Avoid this by explicity excluding it in mkerrors.sh.

Change-Id: I5a73797e5e9a1a92cb39f96f360fdb48982a7741
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Change-Id: I4f2fd8a7c899403f545d8dc73fec2ebbb0b322c0
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Fixes golang/go#25354

Change-Id: Ic74005ed26792a78354ffe76f567e9a009eabe9a
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Fixes golang/go#25341

Change-Id: I79cb4c77b771e005eb27d4e495ac6a7491e2e66e
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Found in https://storage.googleapis.com/go-build-log/300ed876/misc-vet-vetall_dd96a388.log

cmd/vendor/golang.org/x/sys/windows/asm_windows_386.s:9: [386] getprocaddress: wrong argument size 8; expected $...-16
cmd/vendor/golang.org/x/sys/windows/asm_windows_386.s:12: [386] loadlibrary: wrong argument size 4; expected $...-12
cmd/vendor/golang.org/x/sys/windows/svc/service.go:337: cmd/vendor/golang.org/x/sys/windows.SERVICE_TABLE_ENTRY composite literal uses unkeyed fields
cmd/vendor/golang.org/x/sys/windows/svc/service.go:338: cmd/vendor/golang.org/x/sys/windows.SERVICE_TABLE_ENTRY composite literal uses unkeyed fields
cmd/vendor/golang.org/x/sys/windows/svc/debug/service.go:34: cmd/vendor/golang.org/x/sys/windows/svc.ChangeRequest composite literal uses unkeyed fields
cmd/vendor/golang.org/x/sys/windows/svc/mgr/config.go:124: cmd/vendor/golang.org/x/sys/windows.SERVICE_DESCRIPTION composite literal uses unkeyed fields

Change-Id: Ic08cfcc802aac89cfa1eb98661ec556c844e8013
Reviewed-on: https://go-review.googlesource.com/112557Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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From https://storage.googleapis.com/go-build-log/ebe363d0/misc-vet-vetall_b459ec91.log

cmd/vendor/golang.org/x/sys/unix/asm_dragonfly_amd64.s:16: [amd64] Syscall: wrong argument size 64; expected $...-56
cmd/vendor/golang.org/x/sys/unix/asm_dragonfly_amd64.s:19: [amd64] Syscall6: wrong argument size 88; expected $...-80
cmd/vendor/golang.org/x/sys/unix/asm_dragonfly_amd64.s:22: [amd64] Syscall9: wrong argument size 112; expected $...-104
cmd/vendor/golang.org/x/sys/unix/asm_dragonfly_amd64.s:25: [amd64] RawSyscall: wrong argument size 64; expected $...-56
cmd/vendor/golang.org/x/sys/unix/asm_dragonfly_amd64.s:28: [amd64] RawSyscall6: wrong argument size 88; expected $...-80

Change-Id: I5c2264154e819a124aade5d18d261b7934b0090a
Reviewed-on: https://go-review.googlesource.com/112556Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The messages contain no format string, so there is no need to use
t.Fatalf.

Change-Id: I29098c04797f919784b732af84a63fbaed671558
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Add ErrnoName and SignalName to get errno and signal name strings from
syscall.Errno and syscall.Signal values, respectively.

This repurposes the errors and signals vars (because they are not used
within x/sys/unix currently) and turns them into slices of struct,
containing errno/signal number, name and description. ErrnoName and
SignalName can then be trivially implemented using sort.Search.

Renaming errors to errorList additionaly allows to avoid package aliases
for the errors package.

Fixes golang/go#25134

Change-Id: Ie195872793f44c437f0f175ccfaa13a2546338c5
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Second argument of servicemain is a pointer. See

https://msdn.microsoft.com/en-us/library/windows/desktop/ms685138(v=vs.85).aspx

So amd64 assembler code should use MOVQ to read that value.
I probably copied 386 assembler code into amd64 and did not
adjust the code.

Broken code was used to pass parameters to the service, so
add some tests to verify that parameter passing works.

Fixes golang/go#24575

Change-Id: I89f8cad026ea13f8a5d78ff3e24b7236e27fc91f
Reviewed-on: https://go-review.googlesource.com/110160
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This CL introduces a new cpu package for CPU/platform feature detection.
The cpu package is basically a copy of `internal/cpu` of the standard library.
Revision: bf86aec25972f3a100c3aa58a6abcbcc35bdea49

This CL does not export ARM64 and PPC64 feature detection since at the moment
ARM64/PPC64 requires standard library support.

Updates golang/go#24843

Change-Id: I11bc1ca60b116e902c941b5887c00870dbb1f899
Reviewed-on: https://go-review.googlesource.com/107015Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The stat syscall is disallowed by Android's seccomp policy on
linux/amd64. Use the fstatat syscall with AT_FDCWD and zero flags to
achieve the same behavior.

CL 109835 did the same for package syscall.

Change-Id: Iaa7d0dbf17ade4803f59b4361973ce627bcb65b4
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This is yet another syscall that needs to be changed around for
Android's seccomp. We already do this in MIPS64 and ARM64, but
apparently forgot about AMD64.

Change-Id: I42c8a4653a55d4714dacfaf7add14012f428c992
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Change-Id: If795a53b8532c35731f18b9a94ca8c53a4bc23c2
Reviewed-on: https://go-review.googlesource.com/109357
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These types and constants are taken from hdreg.h, and will enable
querying and manipulation of block devices on Linux.

Fixes golang/go#24971

Change-Id: Iafe8f81ba7ab9f1e127743dab6a9fb1912874a5c
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By simply rearranging the logic, we avoid the overhead of a superfluous
call to getsockopt. For, if p is already non empty, there's no point
in having to check if we need to attach dummy payload. This has
performance benefits when using send/recvmsg for high speed
communications.

Change-Id: If47ab5322464aad8e6d2603a369e95327223211f
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Change-Id: I0cd02100844d7565f6fc18278ff52a8cceaacec5
Reviewed-on: https://go-review.googlesource.com/107938Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This structure is used with setsockopt in BGP speaker implementations.

For more information, please see:
https://criticalindirection.com/2015/05/12/tcp_md5sig/.

Fixes golang/go#24830

Change-Id: Ic2137e843ad502dbe9a4227362b63164789c5877
Reviewed-on: https://go-review.googlesource.com/106656Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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As spotted by Brad Fitzpatrick, CL 106838 unexported the value field of
Fsid and Sigset_t, but these types would be useless without any exported
fields. Re-export them via an exception in mkpost.go

Change-Id: I30d3c3b81c8c1b6377f8aa55cad816e3486a4395
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Change-Id: I9f0ca3c2c1cd79f0c996ebbc7f79a42f740e0d2c
GitHub-Last-Rev: ebd0046a4fefcd70d4b21f043a350c6f4df21cfd
GitHub-Pull-Request: golang/sys#10
Reviewed-on: https://go-review.googlesource.com/107302Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This adds a wrapper around perf_event_open, exported constants and
two structs:
 - perf_event_attr, used to configure the syscall
 - perf_event_mmap_page to coordinate the kernel's mmap ring buffer

Change-Id: Ife7ded8344de9e3eb74441bd51ab9a04c81b4965
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On linux/s390x these fields are already hidden. Don't export them on any
other platform either.

Preparatory CL for https://golang.org/cl/106656

Change-Id: I421a0ba41ff46081e2576be212e246a4dd982a67
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