diff options
| -rw-r--r-- | contrib/getdents-debug/getdents/getdents.go | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/contrib/getdents-debug/getdents/getdents.go b/contrib/getdents-debug/getdents/getdents.go index a70692a..cd1e49d 100644 --- a/contrib/getdents-debug/getdents/getdents.go +++ b/contrib/getdents-debug/getdents/getdents.go @@ -27,6 +27,11 @@ unix.Getdents fd3: n=4176, err=<nil> unix.Getdents fd3: n=3192, err=<nil> unix.Getdents fd3: n=0, err=<nil> total 24072 bytes + + +Failure looks like this in strace: + +[pid 189974] getdents64(6, 0xc000105808, 10000) = -1 ENOENT (No such file or directory) */ package main @@ -34,7 +39,6 @@ package main import ( "flag" "fmt" - "log" "os" "golang.org/x/sys/unix" @@ -46,30 +50,41 @@ const ( func main() { flag.Usage = func() { - fmt.Fprintf(os.Stderr, "Usage: %s PATH\n", myName) + fmt.Fprintf(os.Stderr, "Usage: %s [-loop] PATH\n", myName) fmt.Fprintf(os.Stderr, "Run getdents(2) on PATH\n") os.Exit(1) } + loop := flag.Bool("loop", false, "Run in a loop") flag.Parse() if flag.NArg() != 1 { flag.Usage() } path := flag.Arg(0) - fd, err := unix.Open(path, unix.O_RDONLY, 0) - if err != nil { - log.Fatalf("unix.Open returned err=%v", err) - } - tmp := make([]byte, 10000) - sum := 0 for { - n, err := unix.Getdents(fd, tmp) - fmt.Printf("unix.Getdents fd%d: n=%d, err=%v\n", fd, n, err) - if n <= 0 { - fmt.Printf("total %d bytes\n", sum) + sum := 0 + fd, err := unix.Open(path, unix.O_RDONLY, 0) + if err != nil { + fmt.Printf("unix.Open returned err=%v\n", err) + continue + } + fmt.Printf("unix.Getdents: ") + for { + n, err := unix.Getdents(fd, tmp) + fmt.Printf("n=%d; ", n) + if n <= 0 { + fmt.Printf("err=%v; total %d bytes\n", err, sum) + if err != nil { + os.Exit(1) + } + break + } + sum += n + } + unix.Close(fd) + if !*loop { break } - sum += n } } |