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      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 package runtime
      6 
      7 import "unsafe"
      8 
      9 var tracebackbuf [128]byte
     10 
     11 func gogetenv(key string) string {
     12 	var file [128]byte
     13 	if len(key) > len(file)-6 {
     14 		return ""
     15 	}
     16 
     17 	copy(file[:], "/env/")
     18 	copy(file[5:], key)
     19 
     20 	fd := open(&file[0], _OREAD, 0)
     21 	if fd < 0 {
     22 		return ""
     23 	}
     24 	n := seek(fd, 0, 2)
     25 	if n <= 0 {
     26 		closefd(fd)
     27 		return ""
     28 	}
     29 
     30 	p := make([]byte, n)
     31 
     32 	r := pread(fd, unsafe.Pointer(&p[0]), int32(n), 0)
     33 	closefd(fd)
     34 	if r < 0 {
     35 		return ""
     36 	}
     37 
     38 	if p[r-1] == 0 {
     39 		r--
     40 	}
     41 
     42 	var s string
     43 	sp := (*_string)(unsafe.Pointer(&s))
     44 	sp.str = &p[0]
     45 	sp.len = int(r)
     46 	return s
     47 }
     48 
     49 var _cgo_setenv unsafe.Pointer   // pointer to C function
     50 var _cgo_unsetenv unsafe.Pointer // pointer to C function
     51