7a9389330e
gcc/: * gcc.c (default_compilers): Add entry for ".go". * common.opt: Add -static-libgo as a driver option. * doc/install.texi (Configuration): Mention libgo as an option for --enable-shared. Mention go as an option for --enable-languages. * doc/invoke.texi (Overall Options): Mention .go as a file name suffix. Mention go as a -x option. * doc/frontends.texi (G++ and GCC): Mention Go as a supported language. * doc/sourcebuild.texi (Top Level): Mention libgo. * doc/standards.texi (Standards): Add section on Go language. Move references for other languages into their own section. * doc/contrib.texi (Contributors): Mention that I contributed the Go frontend. gcc/testsuite/: * lib/go.exp: New file. * lib/go-dg.exp: New file. * lib/go-torture.exp: New file. * lib/target-supports.exp (check_compile): Match // Go. From-SVN: r167407
93 lines
2.0 KiB
Go
93 lines
2.0 KiB
Go
// Copyright 2009 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 os
|
|
|
|
import (
|
|
"syscall"
|
|
)
|
|
|
|
// Getwd returns a rooted path name corresponding to the
|
|
// current directory. If the current directory can be
|
|
// reached via multiple paths (due to symbolic links),
|
|
// Getwd may return any one of them.
|
|
func Getwd() (string, Error) {
|
|
// If the operating system provides a Getwd call, use it.
|
|
if syscall.ImplementsGetwd {
|
|
s, e := syscall.Getwd()
|
|
return s, NewSyscallError("getwd", e)
|
|
}
|
|
|
|
// Otherwise, we're trying to find our way back to ".".
|
|
dot, err := Stat(".")
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
// Clumsy but widespread kludge:
|
|
// if $PWD is set and matches ".", use it.
|
|
pwd := Getenv("PWD")
|
|
if len(pwd) > 0 && pwd[0] == '/' {
|
|
d, err := Stat(pwd)
|
|
if err == nil && d.Dev == dot.Dev && d.Ino == dot.Ino {
|
|
return pwd, nil
|
|
}
|
|
}
|
|
|
|
// Root is a special case because it has no parent
|
|
// and ends in a slash.
|
|
root, err := Stat("/")
|
|
if err != nil {
|
|
// Can't stat root - no hope.
|
|
return "", err
|
|
}
|
|
if root.Dev == dot.Dev && root.Ino == dot.Ino {
|
|
return "/", nil
|
|
}
|
|
|
|
// General algorithm: find name in parent
|
|
// and then find name of parent. Each iteration
|
|
// adds /name to the beginning of pwd.
|
|
pwd = ""
|
|
for parent := ".."; ; parent = "../" + parent {
|
|
if len(parent) >= 1024 { // Sanity check
|
|
return "", ENAMETOOLONG
|
|
}
|
|
fd, err := Open(parent, O_RDONLY, 0)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
for {
|
|
names, err := fd.Readdirnames(100)
|
|
if err != nil {
|
|
fd.Close()
|
|
return "", err
|
|
}
|
|
for _, name := range names {
|
|
d, _ := Lstat(parent + "/" + name)
|
|
if d.Dev == dot.Dev && d.Ino == dot.Ino {
|
|
pwd = "/" + name + pwd
|
|
goto Found
|
|
}
|
|
}
|
|
}
|
|
fd.Close()
|
|
return "", ENOENT
|
|
|
|
Found:
|
|
pd, err := fd.Stat()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
fd.Close()
|
|
if pd.Dev == root.Dev && pd.Ino == root.Ino {
|
|
break
|
|
}
|
|
// Set up for next round.
|
|
dot = pd
|
|
}
|
|
return pwd, nil
|
|
}
|