1*7c3d14c8STreehugger Robot // RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
2*7c3d14c8STreehugger Robot // RUN: %clangxx_msan -O3 -g %s -o %t && %run %t
3*7c3d14c8STreehugger Robot
4*7c3d14c8STreehugger Robot // RUN: %clangxx_msan -DPOSITIVE -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
5*7c3d14c8STreehugger Robot // RUN: %clangxx_msan -DPOSITIVE -O3 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
6*7c3d14c8STreehugger Robot
7*7c3d14c8STreehugger Robot #include <assert.h>
8*7c3d14c8STreehugger Robot #include <stdlib.h>
9*7c3d14c8STreehugger Robot #include <net/if.h>
10*7c3d14c8STreehugger Robot #include <stdio.h>
11*7c3d14c8STreehugger Robot #include <string.h>
12*7c3d14c8STreehugger Robot #include <sys/ioctl.h>
13*7c3d14c8STreehugger Robot #include <sys/socket.h>
14*7c3d14c8STreehugger Robot #include <unistd.h>
15*7c3d14c8STreehugger Robot
main(int argc,char ** argv)16*7c3d14c8STreehugger Robot int main(int argc, char **argv) {
17*7c3d14c8STreehugger Robot int fd = socket(AF_INET, SOCK_STREAM, 0);
18*7c3d14c8STreehugger Robot
19*7c3d14c8STreehugger Robot struct ifreq ifreqs[20];
20*7c3d14c8STreehugger Robot struct ifconf ifc;
21*7c3d14c8STreehugger Robot ifc.ifc_ifcu.ifcu_req = ifreqs;
22*7c3d14c8STreehugger Robot #ifndef POSITIVE
23*7c3d14c8STreehugger Robot ifc.ifc_len = sizeof(ifreqs);
24*7c3d14c8STreehugger Robot #endif
25*7c3d14c8STreehugger Robot int res = ioctl(fd, SIOCGIFCONF, (void *)&ifc);
26*7c3d14c8STreehugger Robot // CHECK: Uninitialized bytes in ioctl{{.*}} at offset 0 inside [0x{{.*}}, 4)
27*7c3d14c8STreehugger Robot // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
28*7c3d14c8STreehugger Robot // CHECK: #{{.*}} in main {{.*}}ioctl_custom.cc:[[@LINE-3]]
29*7c3d14c8STreehugger Robot assert(res == 0);
30*7c3d14c8STreehugger Robot for (int i = 0; i < ifc.ifc_len / sizeof(*ifc.ifc_ifcu.ifcu_req); ++i)
31*7c3d14c8STreehugger Robot printf("%d %zu %s\n", i, strlen(ifreqs[i].ifr_name), ifreqs[i].ifr_name);
32*7c3d14c8STreehugger Robot return 0;
33*7c3d14c8STreehugger Robot }
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