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author | Ian Lance Taylor <ian@gcc.gnu.org> | 2011-12-07 01:11:29 +0000 |
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committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2011-12-07 01:11:29 +0000 |
commit | 9c63abc9a1d127f95162756467284cf76b47aff8 (patch) | |
tree | 84f27a6ab44d932e4b0455f18390b070b4de626e /libgo/go/os/exec/lp_unix.go | |
parent | 374280238f934fa851273e2ee16ba53be890c6b8 (diff) | |
download | gcc-9c63abc9a1d127f95162756467284cf76b47aff8.zip gcc-9c63abc9a1d127f95162756467284cf76b47aff8.tar.gz gcc-9c63abc9a1d127f95162756467284cf76b47aff8.tar.bz2 |
libgo: Update to weekly 2011-11-09.
From-SVN: r182073
Diffstat (limited to 'libgo/go/os/exec/lp_unix.go')
-rw-r--r-- | libgo/go/os/exec/lp_unix.go | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/libgo/go/os/exec/lp_unix.go b/libgo/go/os/exec/lp_unix.go new file mode 100644 index 0000000..d234641 --- /dev/null +++ b/libgo/go/os/exec/lp_unix.go @@ -0,0 +1,55 @@ +// Copyright 2010 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. + +// +build darwin freebsd linux openbsd + +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 contains a slash, it is tried directly and the PATH is not consulted. +func LookPath(file string) (string, error) { + // NOTE(rsc): I wish we could use the Plan 9 behavior here + // (only bypass the path if file begins with / or ./ or ../) + // but that would not match all the Unix shells. + + if strings.Contains(file, "/") { + err := findExecutable(file) + if err == nil { + return file, nil + } + return "", &Error{file, err} + } + pathenv := os.Getenv("PATH") + for _, dir := range strings.Split(pathenv, ":") { + if dir == "" { + // Unix shell semantics: path element "" means "." + dir = "." + } + if err := findExecutable(dir + "/" + file); err == nil { + return dir + "/" + file, nil + } + } + return "", &Error{file, ErrNotFound} +} |