1// RUN: %clangxx_msan -m64 -O0 -g %s -o %t && %run %t
2// RUN: %clangxx_msan -m64 -O3 -g %s -o %t && %run %t
3
4// RUN: %clangxx_msan -DPOSITIVE -m64 -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
5// RUN: %clangxx_msan -DPOSITIVE -m64 -O3 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
6
7#include <assert.h>
8#include <stdlib.h>
9#include <net/if.h>
10#include <stdio.h>
11#include <string.h>
12#include <sys/ioctl.h>
13#include <sys/socket.h>
14#include <unistd.h>
15
16int main(int argc, char **argv) {
17  int fd = socket(AF_INET, SOCK_STREAM, 0);
18
19  struct ifreq ifreqs[20];
20  struct ifconf ifc;
21  ifc.ifc_ifcu.ifcu_req = ifreqs;
22#ifndef POSITIVE
23  ifc.ifc_len = sizeof(ifreqs);
24#endif
25  int res = ioctl(fd, SIOCGIFCONF, (void *)&ifc);
26  // CHECK: Uninitialized bytes in ioctl{{.*}} at offset 0 inside [0x{{.*}}, 4)
27  // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
28  // CHECK: #{{.*}} in main {{.*}}ioctl_custom.cc:[[@LINE-3]]
29  assert(res == 0);
30  for (int i = 0; i < ifc.ifc_len / sizeof(*ifc.ifc_ifcu.ifcu_req); ++i)
31    printf("%d  %zu  %s\n", i, strlen(ifreqs[i].ifr_name), ifreqs[i].ifr_name);
32  return 0;
33}
34