13 static void fail(const char *what
) { perror(what
); exit(1); }
15 int main(int argc
, char *argv
[])
25 for (i
= 0; i
< argc
- 1; i
++) {
27 fprintf(stderr
, "too many\n");
30 if (sscanf(argv
[i
+ 1], "%d:%d", &fds
[i
].cur
, &fds
[i
].want
) < 2 ||
31 fds
[i
].cur
>= MAXFD
) {
32 fprintf(stderr
, "bad syntax\n");
37 for (i
= 0; i
< MAXFD
; i
++) flag
[i
] = -1;
38 for (i
= 0; i
< n
; i
++) {
41 ino
[i
] = ino
[flag
[fd
]];
44 if ((fd2
= open(",delete-me",
45 O_WRONLY
| O_CREAT
| O_EXCL
,
50 if (dup2(fd2
, fd
) < 0) fail("dup2");
53 if (fstat(fd
, &st
)) fail("fstat");
58 if (mdup(fds
, n
)) fail("mdup");
60 for (i
= 0; i
< n
; i
++) {
62 if (fds
[i
].want
!= -1 && fds
[i
].want
!= fd
) {
63 printf("fd %d[%d] != %d\n", fd
, i
, fds
[i
].want
);
65 } else if (fstat(fd
, &st
)) {
66 printf("fstat %d[%d] failed: %s\n", fd
, i
, strerror(errno
));
68 } else if (st
.st_ino
!= ino
[i
]) {
69 printf("ino %d[%d] wrong\n", fd
, i
);