1  /* Test for fdopen bugs.  */
       2  
       3  #include <stdio.h>
       4  #include <stdlib.h>
       5  #include <unistd.h>
       6  #include <fcntl.h>
       7  
       8  #undef assert
       9  #define assert(x) \
      10    if (!(x)) \
      11      { \
      12        fputs ("test failed: " #x "\n", stderr); \
      13        retval = 1; \
      14        goto the_end; \
      15      }
      16  
      17  char buffer[256];
      18  
      19  int
      20  main (int argc, char *argv[])
      21  {
      22    char name[] = "/tmp/tst-fdopen.XXXXXX";
      23    FILE *fp = NULL;
      24    int retval = 0;
      25    int fd;
      26  
      27    fd = mkstemp (name);
      28    if (fd == -1)
      29      {
      30        printf ("mkstemp failed: %m\n");
      31        return 1;
      32      }
      33    close (fd);
      34    fp = fopen (name, "w");
      35    assert (fp != NULL)
      36    fputs ("foobar and baz", fp);
      37    fclose (fp);
      38    fp = NULL;
      39  
      40    fd = open (name, O_RDONLY);
      41    assert (fd != -1);
      42    assert (lseek (fd, 5, SEEK_SET) == 5);
      43    /* The file position indicator associated with the new stream is set to
      44       the position indicated by the file offset associated with the file
      45       descriptor.  */
      46    fp = fdopen (fd, "r");
      47    assert (fp != NULL);
      48    assert (getc (fp) == 'r');
      49    assert (getc (fp) == ' ');
      50  
      51  the_end:
      52    if (fp != NULL)
      53      fclose (fp);
      54    unlink (name);
      55  
      56    return retval;
      57  }