Merge "debuggerd: simplify output handling"
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commit
34de747570
2 changed files with 11 additions and 24 deletions
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@ -276,6 +276,13 @@ bool debuggerd_trigger_dump(pid_t tid, DebuggerdDumpType dump_type, unsigned int
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return false;
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}
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// WARNING: It's not possible to replace the below with a splice call.
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// Due to the way debuggerd does many small writes across the pipe,
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// this would cause splice to copy a page for each write. The second
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// pipe fills up based on the number of pages being copied, even
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// though there is not much data being transferred per page. When
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// the second pipe is full, everything stops since there is nothing
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// reading the second pipe to clear it.
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char buf[1024];
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rc = TEMP_FAILURE_RETRY(read(pipe_read.get(), buf, sizeof(buf)));
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if (rc == 0) {
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@ -41,22 +41,6 @@ static void usage(int exit_code) {
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_exit(exit_code);
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}
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static std::thread spawn_redirect_thread(unique_fd fd) {
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return std::thread([fd{ std::move(fd) }]() {
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while (true) {
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char buf[BUFSIZ];
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ssize_t rc = TEMP_FAILURE_RETRY(read(fd.get(), buf, sizeof(buf)));
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if (rc <= 0) {
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return;
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}
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if (!android::base::WriteFully(STDOUT_FILENO, buf, rc)) {
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return;
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}
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}
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});
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}
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int main(int argc, char* argv[]) {
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if (argc <= 1) usage(0);
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if (argc > 3) usage(1);
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@ -107,14 +91,11 @@ int main(int argc, char* argv[]) {
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}
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}
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unique_fd piperead, pipewrite;
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if (!Pipe(&piperead, &pipewrite)) {
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err(1, "failed to create pipe");
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unique_fd output_fd(fcntl(STDOUT_FILENO, F_DUPFD_CLOEXEC, 0));
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if (output_fd.get() == -1) {
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err(1, "failed to fcntl dup stdout");
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}
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std::thread redirect_thread = spawn_redirect_thread(std::move(piperead));
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if (!debuggerd_trigger_dump(proc_info.pid, dump_type, 0, std::move(pipewrite))) {
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redirect_thread.join();
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if (!debuggerd_trigger_dump(proc_info.pid, dump_type, 0, std::move(output_fd))) {
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if (pid == proc_info.pid) {
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errx(1, "failed to dump process %d", pid);
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} else {
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@ -122,6 +103,5 @@ int main(int argc, char* argv[]) {
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}
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}
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redirect_thread.join();
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return 0;
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}
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