1 // RUN: %clangxx %s -g -DSHARED_LIB -shared -o %t_shared_lib.dylib
2 // RUN: %clangxx %s -g -USHARED_LIB -o %t_loader
3 // RUN: %env_tool_opts=verbosity=3 %run %t_loader %t_shared_lib.dylib > %t_loader_output.txt 2>&1
4 // RUN: FileCheck -input-file=%t_loader_output.txt %s
5 // RUN: FileCheck -check-prefix=CHECK-STACKTRACE -input-file=%t_loader_output.txt %s
6 // rdar://problem/61793759 and rdar://problem/62126022.
7 // UNSUPPORTED: lsan
8
9 #include <stdio.h>
10
11 #ifdef SHARED_LIB
12 #include <sanitizer/common_interface_defs.h>
13
PrintStack()14 extern "C" void PrintStack() {
15 fprintf(stderr, "Calling __sanitizer_print_stack_trace\n");
16 // CHECK-STACKTRACE: #0{{( *0x.* *in *)?}} __sanitizer_print_stack_trace
17 // CHECK-STACKTRACE: #1{{( *0x.* *in *)?}} PrintStack {{.*}}print-stack-trace-in-code-loaded-after-fork.cpp:[[@LINE+1]]
18 __sanitizer_print_stack_trace();
19 }
20 #else
21 #include <assert.h>
22 #include <dlfcn.h>
23 #include <stdlib.h>
24 #include <sys/wait.h>
25 #include <unistd.h>
26
27 typedef void (*PrintStackFnPtrTy)(void);
28
main(int argc,char ** argv)29 int main(int argc, char **argv) {
30 assert(argc == 2);
31 pid_t pid = fork();
32 if (pid != 0) {
33 // Parent
34 pid_t parent_pid = getpid();
35 fprintf(stderr, "parent: %d\n", parent_pid);
36 int status = 0;
37 pid_t child = waitpid(pid, &status, /*options=*/0);
38 assert(pid == child);
39 bool clean_exit = WIFEXITED(status) && WEXITSTATUS(status) == 0;
40 return !clean_exit;
41 }
42 // Child.
43 pid = getpid();
44 // CHECK: child: [[CHILD_PID:[0-9]+]]
45 fprintf(stderr, "child: %d\n", pid);
46 // We load new code into the child process that isn't loaded into the parent.
47 // When we symbolize in `PrintStack` if the symbolizer is told to symbolize
48 // the parent (an old bug) rather than the child then symbolization will
49 // fail.
50 const char *library_to_load = argv[1];
51 void *handle = dlopen(library_to_load, RTLD_NOW | RTLD_LOCAL);
52 assert(handle);
53 PrintStackFnPtrTy PrintStackFnPtr = (PrintStackFnPtrTy)dlsym(handle, "PrintStack");
54 assert(PrintStackFnPtr);
55 // Check that the symbolizer is told examine the child process.
56 // CHECK: Launching Symbolizer process: {{.+}}atos -p [[CHILD_PID]]
57 // CHECK-STACKTRACE: #2{{( *0x.* *in *)?}} main {{.*}}print-stack-trace-in-code-loaded-after-fork.cpp:[[@LINE+1]]
58 PrintStackFnPtr();
59 return 0;
60 }
61
62 #endif
63