stdio-common/tst-fdopen.c

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