113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
#include <fcntl.h>
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#include <unistd.h>
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#include <sys/epoll.h>
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#include <system_error>
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#include "log.h"
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#include "misc.h"
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#include "logcat_thread.h"
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#define EPOLL_MAX_EVENTS 10
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static void mark_nonblock(int fd) {
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int flags = fcntl(fd, F_GETFL);
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if (flags < 0) {
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throw make_system_error("fcntl(fd, F_GETFL)");
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}
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if (!(flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
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throw make_system_error("fcntl(fd, F_SETFL)");
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}
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}
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LogcatThread::LogcatThread(bool* run_event_loop) {
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int fds[2];
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struct epoll_event event = {.events = EPOLLIN | EPOLLET};
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if (pipe(fds)) {
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std::system_error e = make_system_error("pipe() for stdout");
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this->~LogcatThread();
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throw e;
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}
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this->_stdout_read_fd = fds[0];
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this->_stdout_write_fd = fds[1];
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try {
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mark_nonblock(this->_stdout_read_fd);
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} catch (const std::exception& e) {
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this->~LogcatThread();
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throw;
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}
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if (pipe(fds)) {
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std::system_error e = make_system_error("pipe() for stderr");
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this->~LogcatThread();
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throw e;
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}
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this->_stderr_read_fd = fds[0];
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this->_stderr_write_fd = fds[1];
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try {
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mark_nonblock(this->_stderr_read_fd);
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} catch (const std::exception& e) {
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this->~LogcatThread();
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throw;
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}
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this->_epoll_fd = epoll_create1(EPOLL_CLOEXEC);
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if (this->_epoll_fd == -1) {
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throw make_system_error("epoll_create1()");
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}
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event.data.fd = this->_stdout_read_fd;
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if (epoll_ctl(this->_epoll_fd, EPOLL_CTL_ADD, this->_stdout_read_fd, &event)) {
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std::system_error e = make_system_error("epoll_ctl() for stdout");
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this->~LogcatThread();
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throw e;
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}
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event.data.fd = this->_stderr_read_fd;
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if (epoll_ctl(this->_epoll_fd, EPOLL_CTL_ADD, this->_stderr_read_fd, &event)) {
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std::system_error e = make_system_error("epoll_ctl() for stderr");
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this->~LogcatThread();
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throw e;
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}
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this->_thread = std::thread(&LogcatThread::_run, this, run_event_loop);
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}
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LogcatThread::~LogcatThread() {
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if (this->_epoll_fd != -1 && close(this->_epoll_fd)) {
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log(std::string("Failed to close epoll file descriptor: ") + make_system_error("close()").what());
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}
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if (this->_stdout_read_fd != -1 && close(this->_stdout_read_fd)) {
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log(std::string("Failed to close stdout read pipe: ") + make_system_error("close()").what());
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}
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if (this->_stdout_write_fd != -1 && close(this->_stdout_write_fd)) {
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log(std::string("Failed to close stdout write pipe: ") + make_system_error("close()").what());
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}
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if (this->_stderr_read_fd != -1 && close(this->_stderr_read_fd)) {
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log(std::string("Failed to close stderr read pipe: ") + make_system_error("close()").what());
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}
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if (this->_stderr_write_fd != -1 && close(this->_stderr_write_fd)) {
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log(std::string("Failed to close stderr write pipe: ") + make_system_error("close()").what());
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}
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}
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void LogcatThread::join() {
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this->_thread.join();
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}
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void LogcatThread::_run(bool* run_event_loop) {
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struct epoll_event events[EPOLL_MAX_EVENTS];
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while (*run_event_loop) {
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printf("(boop)\n");
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int ready_fds = epoll_wait(this->_epoll_fd, events, EPOLL_MAX_EVENTS, 1000);
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if (ready_fds == -1) {
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printf("%s\n", format_log(make_system_error("epoll_wait()").what()).c_str());
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break;
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}
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for (int i=0; i < ready_fds; i++) {
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printf("ain't no way in hell do we get a ready fd (#%d) when we haven't set up anything\n", i);
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}
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}
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}
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