mdw@git.distorted.org.uk Git - mLib/blob - sys/t/mdup-test.c

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <fcntl.h>
   9 #include "macros.h"
  10 #include "mdup.h"
  11
  12 #define MAXFD 256
  13
  14 /* For some reason, Cygwin has started leaving cruft in the top bits of inode
  15  * numbers, which breaks this test.  Mask them off.
  16  */
  17 #if defined(__CYGWIN__) && defined(__amd64__)
  18 #  define HACK_INODE(ino) ((ino)&0xffffffffffff)
  19 #else
  20 #  define HACK_INODE(ino) (ino)
  21 #endif
  22
  23 static void fail(const char *what) { perror(what); exit(1); }
  24
  25 int main(int argc, char *argv[])
  26 {
  27   int i, n, j;
  28   int fd, fd2;
  29   struct stat st;
  30   int ino[MAXFD];
  31   int flag[MAXFD];
  32   mdup_fd fds[MAXFD];
  33   int win = 1;
  34   int verbose = 0;
  35
  36   for (i = 1, j = 0; i < argc; i++) {
  37     if (STRCMP(argv[i], ==, "-v")) { verbose++; continue; }
  38     if (j >= MAXFD) { fprintf(stderr, "too many\n"); exit(1); }
  39     if (sscanf(argv[i], "%d:%d", &fds[j].cur, &fds[j].want) < 2 ||
  40         fds[j].cur >= MAXFD)
  41       { fprintf(stderr, "bad syntax\n"); exit(1); }
  42     j++;
  43   }
  44   n = j;
  45   for (i = 0; i < MAXFD; i++) flag[i] = -1;
  46   for (i = 0; i < n; i++) {
  47     fd = fds[i].cur;
  48     if (flag[fd] >= 0) {
  49       ino[i] = ino[flag[fd]];
  50       if (verbose)
  51         printf("exist fd %d[%d] = ino %lu\n", fd, i, (unsigned long)ino[i]);
  52     } else {
  53       flag[fd] = i;
  54       if ((fd2 = open(",delete-me",
  55                       O_WRONLY | O_CREAT | O_EXCL,
  56                       0700)) < 0)
  57         fail("creat");
  58       unlink(",delete-me");
  59       if (fd2 != fd) { if (dup2(fd2, fd) < 0) fail("dup2"); close(fd2); }
  60       if (fstat(fd, &st)) fail("fstat");
  61       ino[i] = HACK_INODE(st.st_ino);
  62       if (verbose)
  63         printf("open fd %d[%d] = ino %lu\n", fd, i, (unsigned long)ino[i]);
  64     }
  65   }
  66
  67   if (mdup(fds, n)) fail("mdup");
  68
  69   for (i = 0; i < n; i++) {
  70     fd = fds[i].cur;
  71     if (fds[i].want != -1 && fds[i].want != fd) {
  72       printf("fd %d[%d] != %d\n", fd, i, fds[i].want);
  73       win = 0;
  74     } else if (fstat(fd, &st)) {
  75       printf("fstat %d[%d] failed: %s\n", fd, i, strerror(errno));
  76       win = 0;
  77     } else if (HACK_INODE(st.st_ino) != ino[i]) {
  78       if (!verbose) printf("ino %d[%d] wrong\n", fd, i);
  79       else printf("ino %d[%d] = %lu != %lu\n", fd, i,
  80                   (unsigned long)HACK_INODE(st.st_ino),
  81                   (unsigned long)ino[i]);
  82       win = 0;
  83     }
  84   }
  85
  86   return (!win);
  87 }