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getdents-debug: loop and stop on first error 

Also try to improve and unify output a little.

$ ./getdents /usr/share/man/man1
  1: unix.Getdents: n=9984; n=9984; n=9968; n=9976; n=9984; n=9968; n=10000; n=9976; n=9992; n=10000; n=9976; n=9992; n=2312; n=0; err=<nil>; total 122112 bytes
  2: unix.Getdents: n=9984; n=48; n=9976; n=9968; n=9976; n=9976; n=9992; n=9984; n=9992; n=10000; n=9976; n=9968; n=10000; n=2272; n=0; err=<nil>; total 122112 bytes
  3: unix.Getdents: n=9984; n=9984; n=9968; n=704; n=10000; n=10000; n=9968; n=9968; n=9992; n=10000; n=9960; n=9992; n=9992; n=1600; n=0; err=<nil>; total 122112 bytes
  4: unix.Getdents: n=9984; n=9984; n=9968; n=9976; n=9984; n=32; n=9992; n=9984; n=9992; n=10000; n=9976; n=9968; n=10000; n=2272; n=0; err=<nil>; total 122112 bytes

$ ./getdents_c /usr/share/man/man1
  1: getdents64: n=9984; n=9984; n=9968; n=9976; n=9984; n=9968; n=10000; n=9976; n=9992; n=10000; n=9976; n=9992; n=2312; n=0; errno=0 total 122112 bytes
  2: getdents64: n=9984; n=9984; n=9968; n=9976; n=9984; n=9968; n=10000; n=9976; n=9992; n=10000; n=9976; n=9992; n=2312; n=0; errno=0 total 122112 bytes
  3: getdents64: n=9984; n=9984; n=9968; n=9976; n=9984; n=9968; n=10000; n=9976; n=9992; n=10000; n=9976; n=9992; n=2312; n=0; errno=0 total 122112 bytes
  4: getdents64: n=9984; n=9984; n=9968; n=9976; n=9984; n=9968; n=10000; n=9976; n=9992; n=10000; n=9976; n=9992; n=2312; n=0; errno=0 total 122112 bytes
This commit is contained in:
Jakob Unterwurzacher 2020-05-28 23:21:35 +02:00
parent b275c53fa7
commit 22e3eec153
2 changed files with 33 additions and 26 deletions
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18
contrib/getdents-debug/getdents/getdents.go
View File

@ -40,6 +40,7 @@ import (
"flag" "flag"
"fmt" "fmt"
"os" "os"
"time"
"golang.org/x/sys/unix" "golang.org/x/sys/unix"
) )
@ -50,11 +51,10 @@ const (
func main() { func main() {
flag.Usage = func() { flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [-loop] PATH\n", myName) fmt.Fprintf(os.Stderr, "Usage: %s PATH\n", myName)
fmt.Fprintf(os.Stderr, "Run getdents(2) on PATH\n") fmt.Fprintf(os.Stderr, "Run getdents(2) on PATH in a 100ms loop until we hit an error\n")
os.Exit(1) os.Exit(1)
} }
loop := flag.Bool("loop", false, "Run in a loop")
flag.Parse() flag.Parse()
if flag.NArg() != 1 { if flag.NArg() != 1 {
flag.Usage() flag.Usage()
@ -62,14 +62,14 @@ func main() {
path := flag.Arg(0) path := flag.Arg(0)
tmp := make([]byte, 10000) tmp := make([]byte, 10000)
for { for i := 1; ; i++ {
sum := 0 sum := 0
fd, err := unix.Open(path, unix.O_RDONLY, 0) fd, err := unix.Open(path, unix.O_RDONLY, 0)
if err != nil { if err != nil {
fmt.Printf("unix.Open returned err=%v\n", err) fmt.Printf("%3d: unix.Open returned err=%v\n", err)
continue os.Exit(1)
} }
fmt.Printf("unix.Getdents: ") fmt.Printf("%3d: unix.Getdents: ", i)
for { for {
n, err := unix.Getdents(fd, tmp) n, err := unix.Getdents(fd, tmp)
fmt.Printf("n=%d; ", n) fmt.Printf("n=%d; ", n)
@ -83,8 +83,6 @@ func main() {
sum += n sum += n
} }
unix.Close(fd) unix.Close(fd)
if !*loop { time.Sleep(100 * time.Millisecond)
break
}
} }
} }

41
contrib/getdents-debug/getdents_c/getdents.c
View File

@ -12,28 +12,37 @@
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
if(argc < 2) { if(argc != 2) {
printf("Usage: %s PATH\n", argv[0]); printf("Usage: %s PATH\n", argv[0]);
printf("Run getdents(2) on PATH\n"); printf("Run getdents(2) on PATH in a 100ms loop\n");
exit(1); exit(1);
} }
const char *path = argv[1]; const char *path = argv[1];
int fd = open(path, O_RDONLY);
if (fd == -1) {
perror("open");
exit(1);
}
char tmp[10000]; for (int i = 1 ; ; i ++ ) {
int sum = 0; int fd = open(path, O_RDONLY);
for ( ; ; ) { if (fd == -1) {
int n = syscall(SYS_getdents64, fd, tmp, sizeof(tmp)); perror("open");
printf("getdents64 fd%d: n=%d, errno=%d\n", fd, n, errno); exit(1);
if (n <= 0) {
printf("total %d bytes\n", sum);
break;
} }
sum += n;
char tmp[10000];
int sum = 0;
printf("%3d: getdents64: ", i);
for ( ; ; ) {
int n = syscall(SYS_getdents64, fd, tmp, sizeof(tmp));
printf("n=%d; ", n);
if (n <= 0) {
printf("errno=%d total %d bytes\n", errno, sum);
if (n < 0) {
exit(1);
}
break;
}
sum += n;
}
close(fd);
usleep(100000);
} }
} }