mirror of
https://github.com/golang/go
synced 2024-11-20 07:54:39 -07:00
dac3f486ac
Change-Id: I49cda99f81b754e25fad1483de373f7d07d64808 Reviewed-on: https://go-review.googlesource.com/6452 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
|
|
|
|
package runtime
|
|
|
|
import "unsafe"
|
|
|
|
func gogetenv(key string) string {
|
|
env := environ()
|
|
if env == nil {
|
|
throw("getenv before env init")
|
|
}
|
|
for _, s := range environ() {
|
|
if len(s) > len(key) && s[len(key)] == '=' && s[:len(key)] == key {
|
|
return s[len(key)+1:]
|
|
}
|
|
}
|
|
return ""
|
|
}
|
|
|
|
var _cgo_setenv unsafe.Pointer // pointer to C function
|
|
var _cgo_unsetenv unsafe.Pointer // pointer to C function
|
|
|
|
// Update the C environment if cgo is loaded.
|
|
// Called from syscall.Setenv.
|
|
//go:linkname syscall_setenv_c syscall.setenv_c
|
|
func syscall_setenv_c(k string, v string) {
|
|
if _cgo_setenv == nil {
|
|
return
|
|
}
|
|
arg := [2]unsafe.Pointer{cstring(k), cstring(v)}
|
|
asmcgocall(unsafe.Pointer(_cgo_setenv), unsafe.Pointer(&arg))
|
|
}
|
|
|
|
// Update the C environment if cgo is loaded.
|
|
// Called from syscall.unsetenv.
|
|
//go:linkname syscall_unsetenv_c syscall.unsetenv_c
|
|
func syscall_unsetenv_c(k string) {
|
|
if _cgo_unsetenv == nil {
|
|
return
|
|
}
|
|
arg := [1]unsafe.Pointer{cstring(k)}
|
|
asmcgocall(unsafe.Pointer(_cgo_unsetenv), unsafe.Pointer(&arg))
|
|
}
|
|
|
|
func cstring(s string) unsafe.Pointer {
|
|
p := make([]byte, len(s)+1)
|
|
sp := (*_string)(unsafe.Pointer(&s))
|
|
memmove(unsafe.Pointer(&p[0]), unsafe.Pointer(sp.str), uintptr(len(s)))
|
|
return unsafe.Pointer(&p[0])
|
|
}
|