regress/lib/libc/gen/telldir-memuse/telldir-memuse.c

   1 #include <stdlib.h>
   2 #include <unistd.h>
   3 #include <dirent.h>
   4 #include <err.h>
   5
   6
   7 int main(void)
   8 {
   9         DIR *dp;
  10         long loc;
  11         void *memused;
  12         int i;
  13         int oktouse = 4096;
  14
  15         dp = opendir(".");
  16         if (dp == NULL)
  17                 err(EXIT_FAILURE, "Could not open current directory");
  18         loc = telldir(dp);
  19         memused = sbrk(0);
  20         closedir(dp);
  21
  22         for (i=0; i<1000; i++) {
  23                 dp = opendir(".");
  24                 if (dp == NULL)
  25                         err(EXIT_FAILURE, "Could not open current directory");
  26                 loc = telldir(dp);
  27                 closedir(dp);
  28
  29                 if (sbrk(0) - memused > oktouse) {
  30                         warnx("Used %d extra bytes for %d telldir calls",
  31                                 (sbrk(0)-memused), i);
  32                         oktouse = sbrk(0) - memused;
  33                 }
  34         }
  35         if (oktouse > 4096) {
  36                 errx(EXIT_FAILURE, "Failure: leaked %d bytes", oktouse);
  37 #ifdef DEBUG
  38         } else {
  39                 printf("OK: used %d bytes\n", sbrk(0)-memused);
  40 #endif
  41         }
  42         return 0;
  43 }