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author | ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-12-07 01:11:29 +0000 |
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committer | ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-12-07 01:11:29 +0000 |
commit | 8388e3abaaaa0546c5f1c87a68e583958063cde9 (patch) | |
tree | 84f27a6ab44d932e4b0455f18390b070b4de626e /libgo/go/os/exec/lp_plan9.go | |
parent | bc461ec935abe0c6f3e92be027143b4f25b5682f (diff) | |
download | gcc-8388e3abaaaa0546c5f1c87a68e583958063cde9.tar.gz |
libgo: Update to weekly 2011-11-09.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@182073 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgo/go/os/exec/lp_plan9.go')
-rw-r--r-- | libgo/go/os/exec/lp_plan9.go | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libgo/go/os/exec/lp_plan9.go b/libgo/go/os/exec/lp_plan9.go new file mode 100644 index 00000000000..d4ffc17c006 --- /dev/null +++ b/libgo/go/os/exec/lp_plan9.go @@ -0,0 +1,52 @@ +// Copyright 2011 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. + +package exec + +import ( + "errors" + "os" + "strings" +) + +// ErrNotFound is the error resulting if a path search failed to find an executable file. +var ErrNotFound = errors.New("executable file not found in $path") + +func findExecutable(file string) error { + d, err := os.Stat(file) + if err != nil { + return err + } + if d.IsRegular() && d.Permission()&0111 != 0 { + return nil + } + return os.EPERM +} + +// LookPath searches for an executable binary named file +// in the directories named by the path environment variable. +// If file begins with "/", "#", "./", or "../", it is tried +// directly and the path is not consulted. +func LookPath(file string) (string, error) { + // skip the path lookup for these prefixes + skip := []string{"/", "#", "./", "../"} + + for _, p := range skip { + if strings.HasPrefix(file, p) { + err := findExecutable(file) + if err == nil { + return file, nil + } + return "", &Error{file, err} + } + } + + path := os.Getenv("path") + for _, dir := range strings.Split(path, "\000") { + if err := findExecutable(dir + "/" + file); err == nil { + return dir + "/" + file, nil + } + } + return "", &Error{file, ErrNotFound} +} |