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[MSan] fix process_vm_readv test: Exit silently if syscall is not implemeted 

Reviewers: eugenis

Subscribers: jaydeep, sagar, llvm-commits

Differential Revision: http://reviews.llvm.org/D17560

llvm-svn: 261723
This commit is contained in:
Mohit K. Bhakkad 2016-02-24 08:14:41 +00:00
parent 38e5217b1e
commit 2c56f33dbf
1 changed files with 15 additions and 7 deletions
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22
compiler-rt/test/msan/Linux/process_vm_readv.cc
View File

@ -9,26 +9,31 @@
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
typedef ssize_t (*process_vm_readwritev_fn)(pid_t, const iovec *, unsigned long,
const iovec *, unsigned long,
unsigned long);
int main(void) {
// This requires glibc 2.15.
process_vm_readwritev_fn libc_process_vm_readv =
(process_vm_readwritev_fn)dlsym(RTLD_NEXT, "process_vm_readv");
if (!libc_process_vm_readv) {
// Exit with success, emulating the expected output.
int exit_dummy()
{
#ifdef POSITIVE
printf("process_vm_readv not found!\n");
printf("process_vm_readv not found or not implemented!\n");
printf(
"WARNING: MemorySanitizer: use-of-uninitialized-value (not really)\n");
return 1;
#else
return 0;
#endif
}
}
int main(void) {
// This requires glibc 2.15.
process_vm_readwritev_fn libc_process_vm_readv =
(process_vm_readwritev_fn)dlsym(RTLD_NEXT, "process_vm_readv");
if (!libc_process_vm_readv)
return exit_dummy();
process_vm_readwritev_fn process_vm_readv =
(process_vm_readwritev_fn)dlsym(RTLD_DEFAULT, "process_vm_readv");
@ -44,6 +49,9 @@ int main(void) {
__msan_poison(&b, sizeof(b));
ssize_t res = process_vm_readv(getpid(), iov_b, 2, iov_a, 2, 0);
if (errno == ENOSYS) // Function not implemented
return exit_dummy();
assert(res == 30);
__msan_check_mem_is_initialized(b + 10, 10);
__msan_check_mem_is_initialized(b + 30, 20);