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Do not always set stdin to FNONBLOCK when PICO_PLATFORM=host #1334

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Do not always set stdin to FNONBLOCK when PICO_PLATFORM=host #1334

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16 changes: 14 additions & 2 deletions src/host/hardware_uart/uart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -48,12 +48,24 @@ void _inittty(void) {
//_tty.c_oflag &= ~ONLCR;
tcsetattr(STDIN_FILENO, TCSANOW, &_tty);

fcntl(STDIN_FILENO, F_SETFL, FNONBLOCK);
atexit(_resettty);
}

static int non_blocking_getchar(void) {
fcntl(STDIN_FILENO, F_SETFL, FNONBLOCK);

int c = getchar();

int old = fcntl(STDIN_FILENO, F_GETFL);

fcntl(STDIN_FILENO, F_SETFL, old & ~FNONBLOCK);

return c;
}

#else
void _inittty() {}
static int non_blocking_getchar(void) { return getchar(); }
#endif

typedef struct {
Expand All @@ -67,7 +79,7 @@ static int _nextchar = EOF;

static bool _peekchar() {
if (_nextchar == EOF) {
_nextchar = getchar();
_nextchar = non_blocking_getchar();
}
return _nextchar != EOF;
}
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