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arch/sim: set stdin/stdout nonblocking in host_uart_start() #20032

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Merged
acassis merged 3 commits into from
Sep 2, 2026
+10 −0
Merged

arch/sim: set stdin/stdout nonblocking in host_uart_start() #20032

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256e5bf
sim_hostuart.c: add nonblock flags for /dev/console
chenzihan0416 Aug 20, 2025
576a8a8
sim/hostuart: set stdout to O_NONBLOCK to prevent blocking
GUIDINGLI Feb 28, 2026
e94fe22
arch/sim: switch nonblock setup to ioctl FIONBIO
xiaoxiang781216 Sep 1, 2026
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10 changes: 10 additions & 0 deletions arch/sim/src/sim/posix/sim_hostuart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,8 @@ static void restoremode(void)

void host_uart_start(void)
{
int nonblock = 1;

/* Get the current stdin terminal mode */

tcgetattr(0, &g_cooked);
Expand All @@ -103,6 +105,14 @@ void host_uart_start(void)

setrawmode(0);

host_uninterruptible_no_return(ioctl, 0, FIONBIO, &nonblock);

/* Set stdout to non-blocking to prevent write(1, ...) from blocking
* the entire sim process when the host pipe buffer is full.
*/

host_uninterruptible_no_return(ioctl, 1, FIONBIO, &nonblock);

/* Restore the original terminal mode before exit */

atexit(restoremode);
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