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Fix non blocking I/O on POSIX.

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This commit is contained in:
ArthurSonzogni 2020-05-02 02:02:04 +02:00
parent 2d292b5382
commit cccbe5baa9
1 changed files with 24 additions and 12 deletions
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36
src/ftxui/component/screen_interactive.cpp
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@ -26,7 +26,7 @@
#else
#include <termios.h>
#include <unistd.h>
#include <sys/select.h>
#include <fcntl.h>
#endif
// Quick exit is missing in standard CLang headers
@ -93,22 +93,28 @@ void Win32EventListener(std::atomic<bool>* quit,
#else
int CheckStdinReady(int usec_timeout) {
timeval tv = {0, usec_timeout};
fd_set fds;
FD_ZERO(&fds);
FD_SET(STDIN_FILENO, &fds);
select(STDIN_FILENO + 1, &fds, NULL, NULL, &tv);
return FD_ISSET(STDIN_FILENO, &fds);
}
// Read char from the terminal.
void UnixEventListener(std::atomic<bool>* quit, Sender<char> sender) {
fd_set readfds;
FD_ZERO(&readfds);
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 300000;
const int buffer_size = 100;
const int timeout_usec = 50000;
// short CHAR_AVAILABLE_TO_READ = POLLIN | POLLPRI;
while (!*quit) {
FD_SET(STDIN_FILENO, &readfds);
if (!select(1, &readfds, NULL, NULL, &timeout))
if (!CheckStdinReady(timeout_usec))
continue;
char c = getchar();
sender->Send(c);
char buff[buffer_size];
int l = read(fileno(stdin), buff, buffer_size);
for (int i = 0; i < l; ++i)
sender->Send(buff[i]);
}
}
@ -211,6 +217,12 @@ void ScreenInteractive::Loop(Component* component) {
terminal.c_lflag &= ~ICANON; // Non canonique terminal.
terminal.c_lflag &= ~ECHO; // Do not print after a key press.
terminal.c_cc[VMIN] = 0;
terminal.c_cc[VTIME] = 0;
auto oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);
on_exit_functions.push([=] { fcntl(STDIN_FILENO, F_GETFL, oldf); });
tcsetattr(STDIN_FILENO, TCSANOW, &terminal);
// Handle resize.