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Source file src/runtime/env_posix.go

     1	// Copyright 2012 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
     6	
     7	package runtime
     8	
     9	import "unsafe"
    10	
    11	func gogetenv(key string) string {
    12		env := environ()
    13		if env == nil {
    14			throw("getenv before env init")
    15		}
    16		for _, s := range environ() {
    17			if len(s) > len(key) && s[len(key)] == '=' && s[:len(key)] == key {
    18				return s[len(key)+1:]
    19			}
    20		}
    21		return ""
    22	}
    23	
    24	var _cgo_setenv unsafe.Pointer   // pointer to C function
    25	var _cgo_unsetenv unsafe.Pointer // pointer to C function
    26	
    27	// Update the C environment if cgo is loaded.
    28	// Called from syscall.Setenv.
    29	//go:linkname syscall_setenv_c syscall.setenv_c
    30	func syscall_setenv_c(k string, v string) {
    31		if _cgo_setenv == nil {
    32			return
    33		}
    34		arg := [2]unsafe.Pointer{cstring(k), cstring(v)}
    35		asmcgocall(_cgo_setenv, unsafe.Pointer(&arg))
    36	}
    37	
    38	// Update the C environment if cgo is loaded.
    39	// Called from syscall.unsetenv.
    40	//go:linkname syscall_unsetenv_c syscall.unsetenv_c
    41	func syscall_unsetenv_c(k string) {
    42		if _cgo_unsetenv == nil {
    43			return
    44		}
    45		arg := [1]unsafe.Pointer{cstring(k)}
    46		asmcgocall(_cgo_unsetenv, unsafe.Pointer(&arg))
    47	}
    48	
    49	func cstring(s string) unsafe.Pointer {
    50		p := make([]byte, len(s)+1)
    51		copy(p, s)
    52		return unsafe.Pointer(&p[0])
    53	}
    54	

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