1// RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
2// RUN: %clangxx_msan -O3 -g %s -o %t && %run %t
3
4// RUN: %clangxx_msan -DPOSITIVE -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
5// RUN: %clangxx_msan -DPOSITIVE -O3 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
6
7// Reports different report (not analyzed)
8// XFAIL: target={{.*netbsd.*}}
9
10#include <assert.h>
11#include <stdlib.h>
12#include <net/if.h>
13#include <stdio.h>
14#include <string.h>
15#include <sys/ioctl.h>
16#include <sys/socket.h>
17#include <unistd.h>
18
19int main(int argc, char **argv) {
20 int fd = socket(AF_UNIX, SOCK_STREAM, protocol: 0);
21
22 struct ifreq ifreqs[20];
23 struct ifconf ifc;
24 ifc.ifc_ifcu.ifcu_req = ifreqs;
25#ifndef POSITIVE
26 ifc.ifc_len = sizeof(ifreqs);
27#endif
28 int res = ioctl(fd: fd, SIOCGIFCONF, (void *)&ifc);
29 // CHECK: Uninitialized bytes in ioctl{{.*}} at offset 0 inside [0x{{.*}}, 4)
30 // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
31 // CHECK: #{{.*}} in main {{.*}}ioctl_custom.cpp:[[@LINE-3]]
32 assert(res == 0);
33 for (int i = 0; i < ifc.ifc_len / sizeof(*ifc.ifc_ifcu.ifcu_req); ++i)
34 printf(format: "%d %zu %s\n", i, strlen(s: ifreqs[i].ifr_name), ifreqs[i].ifr_name);
35 return 0;
36}
37

source code of compiler-rt/test/msan/ioctl_custom.cpp