2014-08-30 12:53:47 -06:00
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import "unsafe"
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func getenv(s *byte) *byte {
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val := gogetenv(gostringnocopy(s))
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if val == "" {
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return nil
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}
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// Strings found in environment are NUL-terminated.
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return &bytes(val)[0]
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}
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var tracebackbuf [128]byte
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func gogetenv(key string) string {
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var file [128]byte
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if len(key) > len(file)-6 {
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return ""
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}
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copy(file[:], "/env/")
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copy(file[5:], key)
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fd := open(&file[0], _OREAD, 0)
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if fd < 0 {
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return ""
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}
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2014-09-01 21:03:26 -06:00
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n := seek(fd, 0, 2) - 1
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2014-09-02 16:56:31 -06:00
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if n <= 0 {
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close(fd)
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return ""
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}
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2014-09-01 21:03:26 -06:00
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p := make([]byte, n)
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2014-08-30 12:53:47 -06:00
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2014-09-01 21:03:26 -06:00
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r := pread(fd, unsafe.Pointer(&p[0]), int32(n), 0)
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2014-08-30 12:53:47 -06:00
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close(fd)
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if r < 0 {
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return ""
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}
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var s string
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sp := (*_string)(unsafe.Pointer(&s))
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2014-09-01 21:03:26 -06:00
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sp.str = &p[0]
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2014-08-30 12:53:47 -06:00
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sp.len = int(r)
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return s
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}
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