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go/src/runtime/mmap.go

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all: make copyright headers consistent with one space after period This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-01 15:57:46 -07:00
// Copyright 2015 The Go Authors. All rights reserved.
runtime, runtime/cgo: support using msan on cgo code The memory sanitizer (msan) is a nice compiler feature that can dynamically check for memory errors in C code. It's not useful for Go code, since Go is memory safe. But it is useful to be able to use the memory sanitizer on C code that is linked into a Go program via cgo. Without this change it does not work, as msan considers memory passed from Go to C as uninitialized. To make this work, change the runtime to call the C mmap function when using cgo. When using msan the mmap call will be intercepted and marked as returning initialized memory. Work around what appears to be an msan bug by calling malloc before we call mmap. Change-Id: I8ab7286d7595ae84782f68a98bef6d3688b946f9 Reviewed-on: https://go-review.googlesource.com/15170 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-09-29 22:24:13 -06:00
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !plan9
// +build !solaris
// +build !windows
// +build !nacl
// +build !linux !amd64
package runtime
import "unsafe"
all: single space after period. The tree's pretty inconsistent about single space vs double space after a period in documentation. Make it consistently a single space, per earlier decisions. This means contributors won't be confused by misleading precedence. This CL doesn't use go/doc to parse. It only addresses // comments. It was generated with: $ perl -i -npe 's,^(\s*// .+[a-z]\.) +([A-Z]),$1 $2,' $(git grep -l -E '^\s*//(.+\.) +([A-Z])') $ go test go/doc -update Change-Id: Iccdb99c37c797ef1f804a94b22ba5ee4b500c4f7 Reviewed-on: https://go-review.googlesource.com/20022 Reviewed-by: Rob Pike <r@golang.org> Reviewed-by: Dave Day <djd@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-01 16:21:55 -07:00
// mmap calls the mmap system call. It is implemented in assembly.
runtime: find a home for orphaned comments These comments were left behind after runtime.h was converted from C to Go. I examined the original code and tried to move these to the places that the most sense. Change-Id: I8769d60234c0113d682f9de3bd8d6c34c450c188 Reviewed-on: https://go-review.googlesource.com/21969 Reviewed-by: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-04-13 03:16:21 -06:00
// We only pass the lower 32 bits of file offset to the
// assembly routine; the higher bits (if required), should be provided
// by the assembly routine as 0.
runtime: separate error result for mmap Currently mmap returns an unsafe.Pointer that encodes OS errors as values less than 4096. In practice this is okay, but it borders on being really unsafe: for example, the value has to be checked immediately after return and if stack copying were ever to observe such a value, it would panic. It's also not remotely idiomatic. Fix this by making mmap return a separate pointer value and error, like a normal Go function. Updates #22218. Change-Id: Iefd965095ffc82cc91118872753a5d39d785c3a6 Reviewed-on: https://go-review.googlesource.com/71270 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-10-16 18:28:29 -06:00
// The err result is an OS error code such as ENOMEM.
func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (p unsafe.Pointer, err int)
runtime: intercept munmap as we do mmap For cgo programs on linux-amd64 we call the C function mmap. This supports programs such as the C memory sanitizer that need to intercept all calls to mmap. It turns out that there are programs that intercept both mmap and munmap, or that at least expect that if they intercept mmap, they also intercept munmap. So, if we permit mmap to be intercepted, also permit munmap to be intercepted. No test, as it requires two odd things: a C program that intercepts mmap and munmap, and a Go program that calls munmap. Change-Id: Iec33f47d59f70dbb7463fd12d30728c24cd4face Reviewed-on: https://go-review.googlesource.com/45016 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Austin Clements <austin@google.com>
2017-06-06 16:08:59 -06:00
// munmap calls the munmap system call. It is implemented in assembly.
func munmap(addr unsafe.Pointer, n uintptr)
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