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strace: Update ptrace() usage

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ptrace with PT_TRACEME was updated to also stop the traced thread on
exit from execve.
This commit is contained in:
Itamar 2020-04-11 16:38:59 +03:00 committed by Andreas Kling
parent 479348c9e7
commit 8e87d340c3
1 changed files with 15 additions and 0 deletions
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15
Userland/strace.cpp
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@ -60,11 +60,14 @@ int main(int argc, char** argv)
if (argc == 1)
return usage();
bool spawned_new_process = false;
if (!strcmp(argv[1], "-p")) {
if (argc != 3)
return usage();
g_pid = atoi(argv[2]);
} else {
spawned_new_process = true;
int pid = fork();
if (!pid) {
if (ptrace(PT_TRACE_ME, 0, 0, 0) == -1) {
@ -100,6 +103,18 @@ int main(int argc, char** argv)
return 1;
}
if (spawned_new_process) {
if (ptrace(PT_CONTINUE, g_pid, 0, 0) < 0) {
perror("continue");
return 1;
}
if (waitpid(g_pid, nullptr, WSTOPPED) != g_pid) {
perror("wait_pid");
return 1;
}
}
for (;;) {
if (ptrace(PT_SYSCALL, g_pid, 0, 0) == -1) {
if (errno == ESRCH)