patch library: os/exec

internal/lib/os/exec/lp_unix.go

@@ -8,13 +8,17 @@ package exec
 
 import (
 	"errors"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
 )
 
 // 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 {
-	/* TODO(xsw):
 	d, err := os.Stat(file)
 	if err != nil {
 		return err
@@ -23,7 +27,7 @@ func findExecutable(file string) error {
 	if m.IsDir() {
 		return syscall.EISDIR
 	}
-	err = unix.Eaccess(file, unix.X_OK)
+	err = unixEaccess(file, unix_X_OK)
 	// ENOSYS means Eaccess is not available or not implemented.
 	// EPERM can be returned by Linux containers employing seccomp.
 	// In both cases, fall back to checking the permission bits.
@@ -34,8 +38,6 @@ func findExecutable(file string) error {
 		return nil
 	}
 	return fs.ErrPermission
-	*/
-	panic("todo: exec.findExecutable")
 }
 
 // LookPath searches for an executable named file in the
@@ -47,7 +49,6 @@ func findExecutable(file string) error {
 // As of Go 1.19, LookPath will instead return that path along with an error satisfying
 // errors.Is(err, ErrDot). See the package documentation for more details.
 func LookPath(file string) (string, error) {
-	/* TODO(xsw):
 	// 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.
@@ -68,15 +69,16 @@ func LookPath(file string) (string, error) {
 		path := filepath.Join(dir, file)
 		if err := findExecutable(path); err == nil {
 			if !filepath.IsAbs(path) {
+				/* TODO(xsw):
 				if execerrdot.Value() != "0" {
 					return path, &Error{file, ErrDot}
 				}
 				execerrdot.IncNonDefault()
+				*/
+				panic("todo: exec.LookPath: !filepath.IsAbs(path)")
 			}
 			return path, nil
 		}
 	}
 	return "", &Error{file, ErrNotFound}
-	*/
-	panic("todo: exec.LookPath")
 }

internal/lib/os/exec/unix_constants.go

@@ -0,0 +1,13 @@
+// Copyright 2022 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.
+
+//go:build unix
+
+package exec
+
+const (
+	unix_R_OK = 0x4
+	unix_W_OK = 0x2
+	unix_X_OK = 0x1
+)

internal/lib/os/exec/unix_eaccess_linux.go

@@ -0,0 +1,11 @@
+// Copyright 2022 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 "syscall"
+
+func unixEaccess(path string, mode uint32) error {
+	return syscall.Faccessat(AT_FDCWD, path, mode, AT_EACCESS)
+}

internal/lib/os/exec/unix_eaccess_other.go

@@ -0,0 +1,13 @@
+// Copyright 2022 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.
+
+//go:build unix && !linux
+
+package exec
+
+import "syscall"
+
+func unixEaccess(path string, mode uint32) error {
+	return syscall.ENOSYS
+}

internal/lib/syscall/syscall.go

@@ -24,6 +24,34 @@ import (
 	"github.com/goplus/llgo/c/os"
 )
 
+// Unix returns the time stored in ts as seconds plus nanoseconds.
+func (ts *Timespec) Unix() (sec int64, nsec int64) {
+	return int64(ts.Sec), int64(ts.Nsec)
+}
+
+// Unix returns the time stored in tv as seconds plus nanoseconds.
+func (tv *Timeval) Unix() (sec int64, nsec int64) {
+	return int64(tv.Sec), int64(tv.Usec) * 1000
+}
+
+// Nano returns the time stored in ts as nanoseconds.
+func (ts *Timespec) Nano() int64 {
+	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
+}
+
+// Nano returns the time stored in tv as nanoseconds.
+func (tv *Timeval) Nano() int64 {
+	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
+}
+
+func Getpagesize() int {
+	panic("todo: syscall.Getpagesize")
+}
+
+func Exit(code int) {
+	os.Exit(c.Int(code))
+}
+
 func Getcwd(buf []byte) (n int, err error) {
 	ptr := unsafe.Pointer(unsafe.SliceData(buf))
 	ret := os.Getcwd(ptr, uintptr(len(buf)))