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package file
import (
"fmt"
"os"
"strings"
"syscall"
)
// TODO: syscalls fcntl and dup3 and many more can also manipulate open flags
// Check the tracepoint formates for 'flags'
// Maybe need new BPF type and pass through the ring
var flagsToHumanCache = map[int32]string{-1: "O_?"}
type tuple struct {
syscallNr int
str string
}
var flagsToHuman = []tuple{
{syscall.O_RDONLY, "O_RDONLY"},
{syscall.O_WRONLY, "O_WRONLY"},
{syscall.O_RDWR, "O_RDWR"},
{syscall.O_ACCMODE, "O_ACCMODE"},
{syscall.O_APPEND, "O_APPEND"},
{syscall.O_ASYNC, "O_ASYNC"},
{syscall.O_CLOEXEC, "O_CLOEXEC"},
{syscall.O_CREAT, "O_CREAT"},
{syscall.O_DIRECT, "O_DIRECT"},
{syscall.O_DIRECTORY, "O_DIRECTORY"},
{syscall.O_DSYNC, "O_DSYNC"},
{syscall.O_EXCL, "O_EXCL"},
{syscall.O_NOATIME, "O_NOATIME"},
{syscall.O_NOCTTY, "O_NOCTTY"},
{syscall.O_NOFOLLOW, "O_NOFOLLOW"},
{syscall.O_NONBLOCK, "O_NONBLOCK"},
{syscall.O_SYNC, "O_SYNC"},
{syscall.O_TRUNC, "O_TRUNC"},
}
func flagsToStr(flags int32) string {
if str, ok := flagsToHumanCache[flags]; ok {
return str
}
str := strings.Join(flagsToStrs(flags), "|")
flagsToHumanCache[flags] = fmt.Sprintf("%O=>%s", flags, str)
return str
}
func flagsToStrs(flags int32) (result []string) {
if int(flags)&(os.O_WRONLY|os.O_RDWR) == 0 {
// Must be read only then
result = append(result, "O_RDONLY")
}
for _, toHuman := range flagsToHuman[1:] {
if int(flags)&toHuman.syscallNr == toHuman.syscallNr {
result = append(result, toHuman.str)
}
}
if len(result) == 0 {
result = append(result, "non=>O_RDONLY")
}
return
}
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