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 
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 
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