--- /dev/null
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "mdup.h"
+
+#define MAXFD 256
+
+static void fail(const char *what) { perror(what); exit(1); }
+
+int main(int argc, char *argv[])
+{
+ int i, n;
+ int fd, fd2;
+ struct stat st;
+ int ino[MAXFD];
+ int flag[MAXFD];
+ mdup_fd fds[MAXFD];
+ int win = 1;
+
+ for (i = 0; i < argc - 1; i++) {
+ if (i >= MAXFD) {
+ fprintf(stderr, "too many\n");
+ exit(1);
+ }
+ if (sscanf(argv[i + 1], "%d:%d", &fds[i].cur, &fds[i].want) < 2 ||
+ fds[i].cur >= MAXFD) {
+ fprintf(stderr, "bad syntax\n");
+ exit(1);
+ }
+ }
+ n = argc - 1;
+ for (i = 0; i < MAXFD; i++) flag[i] = -1;
+ for (i = 0; i < n; i++) {
+ fd = fds[i].cur;
+ if (flag[fd] >= 0)
+ ino[i] = ino[flag[fd]];
+ else {
+ flag[fd] = i;
+ if ((fd2 = open(",delete-me",
+ O_WRONLY | O_CREAT | O_EXCL,
+ 0700)) < 0)
+ fail("creat");
+ unlink(",delete-me");
+ if (fd2 != fd) {
+ if (dup2(fd2, fd) < 0) fail("dup2");
+ close(fd2);
+ }
+ if (fstat(fd, &st)) fail("fstat");
+ ino[i] = st.st_ino;
+ }
+ }
+
+ if (mdup(fds, n)) fail("mdup");
+
+ for (i = 0; i < n; i++) {
+ fd = fds[i].cur;
+ if (fds[i].want != -1 && fds[i].want != fd) {
+ printf("fd %d[%d] != %d\n", fd, i, fds[i].want);
+ win = 0;
+ } else if (fstat(fd, &st)) {
+ printf("fstat %d[%d] failed: %s\n", fd, i, strerror(errno));
+ win = 0;
+ } else if (st.st_ino != ino[i]) {
+ printf("ino %d[%d] wrong\n", fd, i);
+ win = 0;
+ }
+ }
+
+ return (!win);
+}