test/inet/gethost_r-align.c

   1 /* Since the reentrant gethost functions take a char * buffer,
   2  * we have to make sure they internally do not assume alignment.
   3  * The actual return values are not relevant.  If the test fails,
   4  * it'll be due to an alignment exception which means the test
   5  * app is killed by the kernel.
   6  */
   7
   8 #include <errno.h>
   9 #include <netdb.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <arpa/inet.h>
  14 #include <sys/socket.h>
  15
  16 int main(int argc, char *argv[])
  17 {
  18         size_t i;
  19         char buf[1024];
  20         in_addr_t addr;
  21
  22         addr = inet_addr("127.0.0.1");
  23
  24         for (i = 0; i < sizeof(size_t) * 2; ++i) {
  25                 struct hostent hent, *hentres;
  26                 int ret, herr;
  27
  28                 printf("Testing misalignment of %2zi bytes: ", i);
  29
  30                 memset(&hent, 0x00, sizeof(hent));
  31                 ret = gethostent_r(&hent, buf + i, sizeof(buf) - i, &hentres, &herr);
  32                 printf("%sgethostent_r() ", (ret ? "!!!" : ""));
  33
  34                 memset(&hent, 0x00, sizeof(hent));
  35                 ret = gethostbyname_r("localhost", &hent, buf + i, sizeof(buf) - i, &hentres, &herr);
  36                 printf("%sgethostbyname_r() ", (ret ? "!!!" : ""));
  37
  38                 memset(&hent, 0x00, sizeof(hent));
  39                 ret = gethostbyname2_r("localhost", AF_INET, &hent, buf + i, sizeof(buf) - i, &hentres, &herr);
  40                 printf("%sgethostbyname2_r() ", (ret ? "!!!" : ""));
  41
  42                 memset(&hent, 0x00, sizeof(hent));
  43                 ret = gethostbyaddr_r(&addr, sizeof(addr), AF_INET, &hent, buf + i, sizeof(buf) - i, &hentres, &herr);
  44                 printf("%sgethostbyaddr_r() ", (ret ? "!!!" : ""));
  45
  46                 puts("OK!");
  47         }
  48
  49         return 0;
  50 }