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+id = 2462
+title = "QEMU SIFIVE reading from stdin hangs"
+state = "closed"
+created_at = "2024-07-27T13:19:31.620Z"
+closed_at = "2024-08-13T02:30:02.602Z"
+labels = ["target: riscv"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2462"
+host-os = "Ubuntu23"
+host-arch = "x86"
+qemu-version = "git from july26, 2024"
+guest-os = "n/a"
+guest-arch = "n/a"
+description = """I have a simple test program (C and ASM) that reads from stdin.  When i was using the qemu provided by Ubuntu, QEMU emulator version 8.0.4 (Debian 1:8.0.4+dfsg-1ubuntu3.23.10.5), my test was working, and was able to read bytes from stdin.
+
+Using the latest Qemu from git, breaks my test.  I can still print, but now reading hangs, like its always waiting for input but never getting it.
+
+My guess is that this commit breaks my code:
+https://github.com/qemu/qemu/commit/6ee7ba1b8a10bd8eb1d3b918eaaf9f832a51adb4
+
+Before the above commit, `qemu_chr_fe_set_handlers` was being called, and that is what allowed the default behavior of reading from stdin is on by default?
+
+from sifive_uart.c
+```
+    qemu_chr_fe_set_handlers(&s->chr, sifive_uart_can_rx, sifive_uart_rx,
+                             sifive_uart_event, sifive_uart_be_change, s,
+                             NULL, true);
+```"""
+reproduce = """1. compile simple C program that calls `read` reading a single byte from stdin
+2. do not initialize UART options
+3. run in QEMU, send input, hangs."""
+additional = """Other examples online, like riscv-probe, use a uart init function like below:
+```
+static void sifive_uart_init()
+{
+    uart = (int *)(void *)getauxval(SIFIVE_UART0_CTRL_ADDR);
+    uint32_t uart_freq = getauxval(UART0_CLOCK_FREQ);
+    uint32_t baud_rate = getauxval(UART0_BAUD_RATE);
+    uint32_t divisor = uart_freq / baud_rate - 1;
+    uart[UART_REG_DIV] = divisor;
+    uart[UART_REG_TXCTRL] = UART_TXEN;
+    uart[UART_REG_RXCTRL] = UART_RXEN;
+    uart[UART_REG_IE] = 0;
+}
+```
+
+However, when I was using QEMU 8.0.4, i did not have to write a function like above to init UART, because stdin and stdout were working out of the box.
+Below is my C and ASM:"""