107 lines
3.6 KiB
Go
107 lines
3.6 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package syscall contains an interface to the low-level operating system
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// primitives. The details vary depending on the underlying system, and
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// by default, godoc will display the syscall documentation for the current
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// system. If you want godoc to display syscall documentation for another
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// system, set $GOOS and $GOARCH to the desired system. For example, if
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// you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
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// to freebsd and $GOARCH to arm.
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// The primary use of syscall is inside other packages that provide a more
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// portable interface to the system, such as "os", "time" and "net". Use
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// those packages rather than this one if you can.
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// For details of the functions and data types in this package consult
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// the manuals for the appropriate operating system.
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// These calls return err == nil to indicate success; otherwise
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// err is an operating system error describing the failure.
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// On most systems, that error has type syscall.Errno.
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//
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// NOTE: This package is locked down. Code outside the standard
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// Go repository should be migrated to use the corresponding
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// package in the golang.org/x/sys repository. That is also where updates
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// required by new systems or versions should be applied.
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// See https://golang.org/s/go1.4-syscall for more information.
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//
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package syscall
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import "unsafe"
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// StringByteSlice converts a string to a NUL-terminated []byte,
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// If s contains a NUL byte this function panics instead of
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// returning an error.
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//
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// Deprecated: Use ByteSliceFromString instead.
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func StringByteSlice(s string) []byte {
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a, err := ByteSliceFromString(s)
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if err != nil {
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panic("syscall: string with NUL passed to StringByteSlice")
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}
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return a
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}
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// ByteSliceFromString returns a NUL-terminated slice of bytes
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// containing the text of s. If s contains a NUL byte at any
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// location, it returns (nil, EINVAL).
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func ByteSliceFromString(s string) ([]byte, error) {
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for i := 0; i < len(s); i++ {
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if s[i] == 0 {
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return nil, EINVAL
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}
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}
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a := make([]byte, len(s)+1)
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copy(a, s)
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return a, nil
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}
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// StringBytePtr returns a pointer to a NUL-terminated array of bytes.
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// If s contains a NUL byte this function panics instead of returning
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// an error.
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//
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// Deprecated: Use BytePtrFromString instead.
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func StringBytePtr(s string) *byte { return &StringByteSlice(s)[0] }
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// BytePtrFromString returns a pointer to a NUL-terminated array of
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// bytes containing the text of s. If s contains a NUL byte at any
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// location, it returns (nil, EINVAL).
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func BytePtrFromString(s string) (*byte, error) {
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a, err := ByteSliceFromString(s)
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if err != nil {
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return nil, err
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}
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return &a[0], nil
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}
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// Single-word zero for use when we need a valid pointer to 0 bytes.
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// See mksyscall.pl.
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var _zero uintptr
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var dummy *byte
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const sizeofPtr uintptr = uintptr(unsafe.Sizeof(dummy))
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func (ts *Timespec) Unix() (sec int64, nsec int64) {
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return int64(ts.Sec), int64(ts.Nsec)
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}
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func (tv *Timeval) Unix() (sec int64, nsec int64) {
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return int64(tv.Sec), int64(tv.Usec) * 1000
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}
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func (ts *Timespec) Nano() int64 {
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return int64(ts.Sec)*1e9 + int64(ts.Nsec)
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}
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func (tv *Timeval) Nano() int64 {
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return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
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}
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// use is a no-op, but the compiler cannot see that it is.
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// Calling use(p) ensures that p is kept live until that point.
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// This was needed until Go 1.6 to call syscall.Syscall correctly.
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// As of Go 1.6 the compiler handles that case automatically.
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// The uses and definition of use can be removed early in the Go 1.7 cycle.
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//go:noescape
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func use(p unsafe.Pointer)
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