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
Reviewed-on: https://go-review.googlesource.com/110875
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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
Reviewed-on: https://go-review.googlesource.com/110061
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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
Reviewed-on: https://go-review.googlesource.com/109835Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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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
Reviewed-on: https://go-review.googlesource.com/108455
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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
Reviewed-on: https://go-review.googlesource.com/108337Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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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
Reviewed-on: https://go-review.googlesource.com/105756Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
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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
Reviewed-on: https://go-review.googlesource.com/106838
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Change-Id: I3ecf7802c152b82c0d40f8b1bebcb25feda7fb13
Reviewed-on: https://go-review.googlesource.com/106315
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Also avoid installing recommended packages if possible to silightly
reduce the Docker image size.

Change-Id: I7a3ea33f6501cf063b1aa0324b5928f96241d048
Reviewed-on: https://go-review.googlesource.com/105077
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Fixes golang/go#24649
Fixes golang/go#24677

Change-Id: I3faa74ab68e093a097c3f2a8ec7c054431bdfb3f
Reviewed-on: https://go-review.googlesource.com/104736Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Move the common Getsockopt* implementations to syscall_unix.go instead
of duplicating them in syscall_bsd.go and syscall_linux.go. This also
makes all of them available on Solaris and adds GetsockoptByte on Linux.

Change-Id: Ibf49b27be46be579e63e3b3e2ebc1504e5228d5f
Reviewed-on: https://go-review.googlesource.com/104695
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In a Linux user namespace that doesn't have UID 0 mapped, WriteMsgUnix
will return an EINVAL as the uid-valid-in-uns check comes first in the kernel.

Even if in a user and PID namespace, using the wrong PID in Ucred will
always give EPERM.

Change-Id: Ia7452bbf2911c3b9a2aa5d7df1572e8b0790ff38
GitHub-Last-Rev: 341d3f0cba0511411caffd2ac5a6c8dfb7a022ef
GitHub-Pull-Request: golang/sys#7
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Fixes golang/go#8760

Change-Id: Iacb5802ce6256fc5fb61b558f2d0bc0dcf593c96
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Same was done in CL 7940 for the syscall package.

Fixes golang/go#10838

Change-Id: I98efa99f57f21bdcdbfb117af66f673e37767fec
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Fixes golang/go#24515

Change-Id: Icac78e8f2937668c2ce2fd6a695ce44bb702b8f1
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Change-Id: I8d91f4f959b03f71a8f2effdf7f1c6d1308f2217
Reviewed-on: https://go-review.googlesource.com/102135
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Re-run ./mkall.sh to avoid exporting Pad_cgo* fields on Darwin.

Updates golang/go#18632

Change-Id: Id9d264293d0b1f1c5581aff289c6e826d63e71ef
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Change-Id: I3b32b6343e9bc0bb6a205ada9941b4bb9ef91a23
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Change-Id: I7b32bbbfc73e8e05898bd640e9e92a183c72b92b
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On Illumos, TestFchmodat fails with:

--- FAIL: TestFchmodat (0.00s)
        syscall_unix_test.go:502: Fchmodat: unexpected error: operation not supported on transport endpoint

Like Linux, Illumos doesn't support flags != 0 in Fchmodat, see
https://illumos.org/man/2/chmod

Adjust TestFchmodat accordingly to handle EOPNOTSUPP on Illumos.

Change-Id: Icd4564497a41c4aa962cd76604b5ca2c7575d96c
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Now that Fchmodat is available on all Unices, move TestFchmodat to
syscall_unix_test.go and adjust it such that Fchmodat with
AT_SYMLINK_NOFOLLOW in flags is tested where supported.

Change-Id: I41ef5b874e36d84ed4866706dbba075c39aa00d4
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Change-Id: I63889a9e4eb2c9d8846fa6e47f8c74f54ff7ede8
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Change-Id: I3fd96550d588373d75e14bd554d46e2590c266fb
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Change-Id: If7868a3d43eed266496db8a0e2af908de77362eb
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This should call unix.Exec, not syscall.Exec. Thanks Tobias Klauser
for the spot.

Change-Id: Iddae390891a66652b071e05c1a5a25bbfdb19e52
Reviewed-on: https://go-review.googlesource.com/101435
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Currently the doc string forms one run-on sentence when viewed in
a browser. Add an additional newline so the text is presented in
a browser the same way it is in the source code.

Change-Id: If93e45c5aec9edd195c6bf36cb757c5146368507
Reviewed-on: https://go-review.googlesource.com/101284Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The syscall execve has no wrapper in this library, which it seems like
it should - Ian seemed to concur in CL 72550.

Add a docstring and an example, because I always get confused about
how to invoke the syscall.

Change-Id: I6100bbbf4ace9e3e341bf186a04cc03301da9aea
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Change-Id: I98ca1595895213bbc1f2d6bd984e48f84b23ccbc
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Change-Id: I3a367e9346b1469d7e577524d3306b3d21f8fc43
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Also enable TestFstatat for all Unices now that they all implement
Fstatat.

Change-Id: I9722437042d5fc0df4a27d3a6a2be3d124c60057
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Updates golang/go#24185

Change-Id: Ia2de9218885e0cfeaec79ed7417475230b063df0
Reviewed-on: https://go-review.googlesource.com/100692Reviewed-by: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Id2ae518a5f6abfdae56398a3ef7f205267057257
Reviewed-on: https://go-review.googlesource.com/100616
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Change-Id: Ibf23c327f1420a55a9de7073e9a4f444fb8f3c1f
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