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package file
import (
"bufio"
"bytes"
"fmt"
"os"
"strconv"
"strings"
)
type File interface {
String() string
Name() string
Flags() string
}
type fdFile struct {
fd int32
name string
flags int32
}
func NewFd(fd int32, name []byte, flags int32) fdFile {
return fdFile{fd, stringValue(name), flags}
}
func NewFdWithPid(fd int32, pid uint32) fdFile {
linkName, err := os.Readlink(fmt.Sprintf("/proc/%d/fd/%d", pid, fd))
if err != nil {
return fdFile{fd, "?", -1}
}
flags, _ := readFlagsFromFdInfo(fd, pid)
return fdFile{fd, linkName, flags}
}
func readFlagsFromFdInfo(fd int32, pid uint32) (int32, error) {
data, err := os.ReadFile(fmt.Sprintf("/proc/%d/fdinfo/%d", pid, fd))
if err != nil {
return -1, err
}
scanner := bufio.NewScanner(bytes.NewReader(data))
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "flags:") {
flagsStr := strings.Fields(line)[1]
flags, err := strconv.ParseUint(flagsStr, 8, 32)
return int32(flags), err
}
}
return -1, scanner.Err()
}
func (f fdFile) Name() string {
return f.name
}
func (f fdFile) Flags() string {
return flagsToStr(f.flags)
}
func (f fdFile) String() string {
var sb strings.Builder
if len(f.name) == 0 {
sb.WriteString("?")
} else {
sb.WriteString(f.name)
sb.WriteString(" (")
sb.WriteString(strconv.FormatInt(int64(f.fd), 10))
sb.WriteString(",")
sb.WriteString(f.Flags())
sb.WriteString(")")
}
return sb.String()
}
type oldnameNewnameFile struct {
Oldname, Newname string
}
func NewOldnameNewname(oldname, newname []byte) oldnameNewnameFile {
return oldnameNewnameFile{stringValue(oldname), stringValue(newname)}
}
func (f oldnameNewnameFile) Name() string {
return f.Newname
}
func (f oldnameNewnameFile) Flags() string {
return ""
}
func (f oldnameNewnameFile) String() string {
var sb strings.Builder
sb.WriteString("old:")
sb.WriteString(f.Oldname)
sb.WriteString(" ->new:")
sb.WriteString(f.Newname)
sb.WriteString(" (")
sb.WriteString(f.Flags())
sb.WriteString(")")
return sb.String()
}
type pathnameFile struct {
Pathname string
}
func NewPathname(pathname []byte) pathnameFile {
return pathnameFile{stringValue(pathname)}
}
func (f pathnameFile) Name() string {
return f.Pathname
}
func (f pathnameFile) Flags() string {
return ""
}
func (f pathnameFile) String() string {
var sb strings.Builder
sb.WriteString("pathname:")
sb.WriteString(f.Pathname)
sb.WriteString(" (")
sb.WriteString(f.Flags())
sb.WriteString(")")
return sb.String()
}
// As data comes in from arrays, converted to slices, there will be null-bytes at the end..
func stringValue(byteStr []byte) string {
// TODO: Hopefully, this won't cause a panic when the filename is as long as the array itself. Unit test this!
return string(byteStr[:bytes.IndexByte(byteStr, 0)])
}
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