stdio-common/tst-fdopen.c

   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 }