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Source file src/runtime/env_plan9.go

Documentation: runtime

     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 := stringStructOf(&s)
    44  	sp.str = unsafe.Pointer(&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  

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