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Source file src/runtime/env_posix.go

Documentation: runtime

  // 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 env {
  		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(_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(_cgo_unsetenv, unsafe.Pointer(&arg))
  }
  
  func cstring(s string) unsafe.Pointer {
  	p := make([]byte, len(s)+1)
  	copy(p, s)
  	return unsafe.Pointer(&p[0])
  }
  

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