diff --git a/boards/posix/native_sim/doc/index.rst b/boards/posix/native_sim/doc/index.rst index 42cef26e40cd276..06787a548d5c622 100644 --- a/boards/posix/native_sim/doc/index.rst +++ b/boards/posix/native_sim/doc/index.rst @@ -120,7 +120,7 @@ host libC (:kconfig:option:`CONFIG_EXTERNAL_LIBC`). input, input SDL touch, :kconfig:option:`CONFIG_INPUT_SDL_TOUCH`, host libC log backend, native backend, :kconfig:option:`CONFIG_LOG_BACKEND_NATIVE_POSIX`, all rtc, RTC emul, :kconfig:option:`CONFIG_RTC_EMUL`, all - serial, uart native posix/PTTY, :kconfig:option:`CONFIG_UART_NATIVE_POSIX`, host libC + serial, uart native posix/PTTY, :kconfig:option:`CONFIG_UART_NATIVE_POSIX`, all serial, uart native TTY, :kconfig:option:`CONFIG_UART_NATIVE_TTY`, host libC spi, SPI emul, :kconfig:option:`CONFIG_SPI_EMUL`, all system tick, native_posix timer, :kconfig:option:`CONFIG_NATIVE_POSIX_TIMER`, all diff --git a/drivers/serial/CMakeLists.txt b/drivers/serial/CMakeLists.txt index 9224c29aa645e2a..365db9eb7423d9e 100644 --- a/drivers/serial/CMakeLists.txt +++ b/drivers/serial/CMakeLists.txt @@ -68,7 +68,12 @@ zephyr_library_sources_ifdef(CONFIG_USERSPACE uart_handlers.c) if(CONFIG_UART_NATIVE_POSIX) zephyr_library_compile_definitions(NO_POSIX_CHEATS) - zephyr_library_sources(uart_native_posix.c) + zephyr_library_sources(uart_native_ptty.c) + if (CONFIG_NATIVE_APPLICATION) + zephyr_library_sources(uart_native_ptty_bottom.c) + else() + target_sources(native_simulator INTERFACE uart_native_ptty_bottom.c) + endif() endif() if(CONFIG_UART_NATIVE_TTY) diff --git a/drivers/serial/Kconfig.native_posix b/drivers/serial/Kconfig.native_posix index 6873bff5308eee6..39acf155f9bddb0 100644 --- a/drivers/serial/Kconfig.native_posix +++ b/drivers/serial/Kconfig.native_posix @@ -4,7 +4,6 @@ config UART_NATIVE_POSIX bool "UART driver for native_posix" default y depends on DT_HAS_ZEPHYR_NATIVE_POSIX_UART_ENABLED - depends on EXTERNAL_LIBC select SERIAL_HAS_DRIVER help This enables a UART driver for the POSIX ARCH with up to 2 UARTs. diff --git a/drivers/serial/uart_native_posix.c b/drivers/serial/uart_native_posix.c deleted file mode 100644 index 767df09ec93bf43..000000000000000 --- a/drivers/serial/uart_native_posix.c +++ /dev/null @@ -1,470 +0,0 @@ -/* - * Copyright (c) 2018, Oticon A/S - * - * SPDX-License-Identifier: Apache-2.0 - */ - -#define DT_DRV_COMPAT zephyr_native_posix_uart - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#include "cmdline.h" /* native_posix command line options header */ -#include "posix_native_task.h" - -/* - * UART driver for POSIX ARCH based boards. - * It can support up to two UARTs. - * - * For the first UART: - * - * It can either be connected to the process STDIN+STDOUT - * OR - * to a dedicated pseudo terminal - * - * The 2nd option is the recommended one for interactive use, as the pseudo - * terminal driver will be configured in "raw" mode, and will therefore behave - * more like a real UART. - * - * When connected to its own pseudo terminal, it may also auto attach a terminal - * emulator to it, if set so from command line. - */ - -static int np_uart_stdin_poll_in(const struct device *dev, - unsigned char *p_char); -static int np_uart_tty_poll_in(const struct device *dev, - unsigned char *p_char); -static void np_uart_poll_out(const struct device *dev, - unsigned char out_char); - -static bool auto_attach; -static bool wait_pts; -static const char default_cmd[] = CONFIG_NATIVE_UART_AUTOATTACH_DEFAULT_CMD; -static char *auto_attach_cmd; - -struct native_uart_status { - int out_fd; /* File descriptor used for output */ - int in_fd; /* File descriptor used for input */ -}; - -static struct native_uart_status native_uart_status_0; - -static struct uart_driver_api np_uart_driver_api_0 = { - .poll_out = np_uart_poll_out, - .poll_in = np_uart_tty_poll_in, -}; - -#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) -static struct native_uart_status native_uart_status_1; - -static struct uart_driver_api np_uart_driver_api_1 = { - .poll_out = np_uart_poll_out, - .poll_in = np_uart_tty_poll_in, -}; -#endif /* CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE */ - -#define ERROR posix_print_error_and_exit -#define WARN posix_print_warning - -/** - * Attempt to connect a terminal emulator to the slave side of the pty - * If -attach_uart_cmd= is provided as a command line option, will be - * used. Otherwise, the default command, - * CONFIG_NATIVE_UART_AUTOATTACH_DEFAULT_CMD, will be used instead - */ -static void attach_to_tty(const char *slave_tty) -{ - if (auto_attach_cmd == NULL) { - auto_attach_cmd = (char *)default_cmd; - } - char command[strlen(auto_attach_cmd) + strlen(slave_tty) + 1]; - - sprintf(command, auto_attach_cmd, slave_tty); - - int ret = system(command); - - if (ret != 0) { - WARN("Could not attach to the UART with \"%s\"\n", command); - WARN("The command returned %i\n", WEXITSTATUS(ret)); - } -} - -/** - * Attempt to allocate and open a new pseudoterminal - * - * Returns the file descriptor of the master side - * If auto_attach was set, it will also attempt to connect a new terminal - * emulator to its slave side. - */ -static int open_tty(struct native_uart_status *driver_data, - const char *uart_name, - bool do_auto_attach) -{ - int master_pty; - char *slave_pty_name; - struct termios ter; - struct winsize win; - int err_nbr; - int ret; - int flags; - - win.ws_col = 80; - win.ws_row = 24; - - master_pty = posix_openpt(O_RDWR | O_NOCTTY); - if (master_pty == -1) { - ERROR("Could not open a new TTY for the UART\n"); - } - ret = grantpt(master_pty); - if (ret == -1) { - err_nbr = errno; - close(master_pty); - ERROR("Could not grant access to the slave PTY side (%i)\n", - err_nbr); - } - ret = unlockpt(master_pty); - if (ret == -1) { - err_nbr = errno; - close(master_pty); - ERROR("Could not unlock the slave PTY side (%i)\n", err_nbr); - } - slave_pty_name = ptsname(master_pty); - if (slave_pty_name == NULL) { - err_nbr = errno; - close(master_pty); - ERROR("Error getting slave PTY device name (%i)\n", err_nbr); - } - /* Set the master PTY as non blocking */ - flags = fcntl(master_pty, F_GETFL); - if (flags == -1) { - err_nbr = errno; - close(master_pty); - ERROR("Could not read the master PTY file status flags (%i)\n", - err_nbr); - } - - ret = fcntl(master_pty, F_SETFL, flags | O_NONBLOCK); - if (ret == -1) { - err_nbr = errno; - close(master_pty); - ERROR("Could not set the master PTY as non-blocking (%i)\n", - err_nbr); - } - - (void) err_nbr; - - /* - * Set terminal in "raw" mode: - * Not canonical (no line input) - * No signal generation from Ctr+{C|Z..} - * No echoing, no input or output processing - * No replacing of NL or CR - * No flow control - */ - ret = tcgetattr(master_pty, &ter); - if (ret == -1) { - ERROR("Could not read terminal driver settings\n"); - } - ter.c_cc[VMIN] = 0; - ter.c_cc[VTIME] = 0; - ter.c_lflag &= ~(ICANON | ISIG | IEXTEN | ECHO); - ter.c_iflag &= ~(BRKINT | ICRNL | IGNBRK | IGNCR | INLCR | INPCK - | ISTRIP | IXON | PARMRK); - ter.c_oflag &= ~OPOST; - ret = tcsetattr(master_pty, TCSANOW, &ter); - if (ret == -1) { - ERROR("Could not change terminal driver settings\n"); - } - - posix_print_trace("%s connected to pseudotty: %s\n", - uart_name, slave_pty_name); - - if (wait_pts) { - /* - * This trick sets the HUP flag on the tty master, making it - * possible to detect a client connection using poll. - * The connection of the client would cause the HUP flag to be - * cleared, and in turn set again at disconnect. - */ - ret = open(slave_pty_name, O_RDWR | O_NOCTTY); - if (ret == -1) { - err_nbr = errno; - ERROR("%s: Could not open terminal from the slave side (%i,%s)\n", - __func__, err_nbr, strerror(err_nbr)); - } - ret = close(ret); - if (ret == -1) { - err_nbr = errno; - ERROR("%s: Could not close terminal from the slave side (%i,%s)\n", - __func__, err_nbr, strerror(err_nbr)); - } - } - if (do_auto_attach) { - attach_to_tty(slave_pty_name); - } - - return master_pty; -} - -/** - * @brief Initialize the first native_posix serial port - * - * @param dev UART_0 device struct - * - * @return 0 (if it fails catastrophically, the execution is terminated) - */ -static int np_uart_0_init(const struct device *dev) -{ - struct native_uart_status *d; - - d = (struct native_uart_status *)dev->data; - - if (IS_ENABLED(CONFIG_NATIVE_UART_0_ON_OWN_PTY)) { - int tty_fn = open_tty(d, dev->name, auto_attach); - - d->in_fd = tty_fn; - d->out_fd = tty_fn; - np_uart_driver_api_0.poll_in = np_uart_tty_poll_in; - } else { /* NATIVE_UART_0_ON_STDINOUT */ - d->in_fd = STDIN_FILENO; - d->out_fd = STDOUT_FILENO; - np_uart_driver_api_0.poll_in = np_uart_stdin_poll_in; - - if (isatty(STDIN_FILENO)) { - WARN("The UART driver has been configured to map to the" - " process stdin&out (NATIVE_UART_0_ON_STDINOUT), " - "but stdin seems to be left attached to the shell." - " This will most likely NOT behave as you want it " - "to. This option is NOT meant for interactive use " - "but for piping/feeding from/to files to the UART" - ); - } - } - - return 0; -} - -#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) -/* - * Initialize the 2nd UART port. - * This port will be always attached to its own new pseudoterminal. - */ -static int np_uart_1_init(const struct device *dev) -{ - struct native_uart_status *d; - int tty_fn; - - d = (struct native_uart_status *)dev->data; - - tty_fn = open_tty(d, dev->name, false); - - d->in_fd = tty_fn; - d->out_fd = tty_fn; - - return 0; -} -#endif - -/* - * @brief Output a character towards the serial port - * - * @param dev UART device struct - * @param out_char Character to send. - */ -static void np_uart_poll_out(const struct device *dev, - unsigned char out_char) -{ - int ret; - struct native_uart_status *d = (struct native_uart_status *)dev->data; - - if (wait_pts) { - struct pollfd pfd = { .fd = d->out_fd, .events = POLLHUP }; - - while (1) { - ret = poll(&pfd, 1, 0); - if (ret == -1) { - int err = errno; - /* - * Possible errors are: - * * EINTR :A signal was received => ok - * * EFAULT and EINVAL: parameters/programming error - * * ENOMEM no RAM left - */ - if (err != EINTR) { - ERROR("%s: unexpected error during poll, errno=%i,%s\n", - __func__, err, strerror(err)); - } - } - if (!(pfd.revents & POLLHUP)) { - /* There is now a reader on the slave side */ - break; - } - k_sleep(K_MSEC(100)); - } - } - - /* The return value of write() cannot be ignored (there is a warning) - * but we do not need the return value for anything. - */ - ret = write(d->out_fd, &out_char, 1); - (void) ret; -} - -/** - * @brief Poll the device for input. - * - * @param dev UART device structure. - * @param p_char Pointer to character. - * - * @retval 0 If a character arrived and was stored in p_char - * @retval -1 If no character was available to read - */ -static int np_uart_stdin_poll_in(const struct device *dev, - unsigned char *p_char) -{ - static bool disconnected; - - if (disconnected || feof(stdin)) { - /* - * The stdinput is fed from a file which finished or the user - * pressed Ctrl+D - */ - disconnected = true; - return -1; - } - - int n = -1; - int in_f = ((struct native_uart_status *)dev->data)->in_fd; - - int ready; - fd_set readfds; - static struct timeval timeout; /* just zero */ - - FD_ZERO(&readfds); - FD_SET(in_f, &readfds); - - ready = select(in_f+1, &readfds, NULL, NULL, &timeout); - - if (ready == 0) { - return -1; - } else if (ready == -1) { - ERROR("%s: Error on select ()\n", __func__); - } - - n = read(in_f, p_char, 1); - if ((n == -1) || (n == 0)) { - return -1; - } - - return 0; -} - -/** - * @brief Poll the device for input. - * - * @param dev UART device structure. - * @param p_char Pointer to character. - * - * @retval 0 If a character arrived and was stored in p_char - * @retval -1 If no character was available to read - */ -static int np_uart_tty_poll_in(const struct device *dev, - unsigned char *p_char) -{ - int n = -1; - int in_f = ((struct native_uart_status *)dev->data)->in_fd; - - n = read(in_f, p_char, 1); - if (n == -1) { - return -1; - } - return 0; -} - -DEVICE_DT_INST_DEFINE(0, - &np_uart_0_init, NULL, - (void *)&native_uart_status_0, NULL, - PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, - &np_uart_driver_api_0); - -#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) -DEVICE_DT_INST_DEFINE(1, - &np_uart_1_init, NULL, - (void *)&native_uart_status_1, NULL, - PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, - &np_uart_driver_api_1); -#endif /* CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE */ - -static void auto_attach_cmd_cb(char *argv, int offset) -{ - ARG_UNUSED(argv); - ARG_UNUSED(offset); - - auto_attach = true; -} - -static void np_add_uart_options(void) -{ - if (!IS_ENABLED(CONFIG_NATIVE_UART_0_ON_OWN_PTY)) { - return; - } - - static struct args_struct_t uart_options[] = { - /* - * Fields: - * manual, mandatory, switch, - * option_name, var_name ,type, - * destination, callback, - * description - */ - {false, false, true, - "attach_uart", "", 'b', - (void *)&auto_attach, NULL, - "Automatically attach to the UART terminal"}, - {false, false, false, - "attach_uart_cmd", "\"cmd\"", 's', - (void *)&auto_attach_cmd, auto_attach_cmd_cb, - "Command used to automatically attach to the terminal" - "(implies auto_attach), by " - "default: '" CONFIG_NATIVE_UART_AUTOATTACH_DEFAULT_CMD "'"}, - IF_ENABLED(CONFIG_UART_NATIVE_WAIT_PTS_READY_ENABLE, ( - {false, false, true, - "wait_uart", "", 'b', - (void *)&wait_pts, NULL, - "Hold writes to the uart/pts until a client is " - "connected/ready"},) - ) - ARG_TABLE_ENDMARKER - }; - - native_add_command_line_opts(uart_options); -} - -static void np_cleanup_uart(void) -{ - if (IS_ENABLED(CONFIG_NATIVE_UART_0_ON_OWN_PTY)) { - if (native_uart_status_0.in_fd != 0) { - close(native_uart_status_0.in_fd); - } - } - -#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) - if (native_uart_status_1.in_fd != 0) { - close(native_uart_status_1.in_fd); - } -#endif -} - -NATIVE_TASK(np_add_uart_options, PRE_BOOT_1, 11); -NATIVE_TASK(np_cleanup_uart, ON_EXIT, 99); diff --git a/drivers/serial/uart_native_ptty.c b/drivers/serial/uart_native_ptty.c new file mode 100644 index 000000000000000..77f609a6309eb67 --- /dev/null +++ b/drivers/serial/uart_native_ptty.c @@ -0,0 +1,279 @@ +/* + * Copyright (c) 2018, Oticon A/S + * + * SPDX-License-Identifier: Apache-2.0 + */ + +#define DT_DRV_COMPAT zephyr_native_posix_uart + +#include + +#include +#include + +#include "cmdline.h" /* native_posix command line options header */ +#include "posix_native_task.h" +#include "uart_native_ptty_bottom.h" +#include "nsi_host_trampolines.h" + +/* + * UART driver for POSIX ARCH based boards. + * It can support up to two UARTs. + * + * For the first UART: + * + * It can either be connected to the process STDIN+STDOUT + * OR + * to a dedicated pseudo terminal + * + * The 2nd option is the recommended one for interactive use, as the pseudo + * terminal driver will be configured in "raw" mode, and will therefore behave + * more like a real UART. + * + * When connected to its own pseudo terminal, it may also auto attach a terminal + * emulator to it, if set so from command line. + */ + +static int np_uart_stdin_poll_in(const struct device *dev, + unsigned char *p_char); +static int np_uart_tty_poll_in(const struct device *dev, + unsigned char *p_char); +static void np_uart_poll_out(const struct device *dev, + unsigned char out_char); + +static bool auto_attach; +static bool wait_pts; +static char *auto_attach_cmd = CONFIG_NATIVE_UART_AUTOATTACH_DEFAULT_CMD; + +struct native_uart_status { + int out_fd; /* File descriptor used for output */ + int in_fd; /* File descriptor used for input */ +}; + +static struct native_uart_status native_uart_status_0; + +static struct uart_driver_api np_uart_driver_api_0 = { + .poll_out = np_uart_poll_out, + .poll_in = np_uart_tty_poll_in, +}; + +#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) +static struct native_uart_status native_uart_status_1; + +static struct uart_driver_api np_uart_driver_api_1 = { + .poll_out = np_uart_poll_out, + .poll_in = np_uart_tty_poll_in, +}; +#endif /* CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE */ + +#define ERROR posix_print_error_and_exit +#define WARN posix_print_warning + + + +/** + * @brief Initialize the first native_posix serial port + * + * @param dev UART_0 device struct + * + * @return 0 (if it fails catastrophically, the execution is terminated) + */ +static int np_uart_0_init(const struct device *dev) +{ + struct native_uart_status *d; + + d = (struct native_uart_status *)dev->data; + + if (IS_ENABLED(CONFIG_NATIVE_UART_0_ON_OWN_PTY)) { + int tty_fn = np_uart_open_ptty(dev->name, auto_attach_cmd, auto_attach, wait_pts); + + d->in_fd = tty_fn; + d->out_fd = tty_fn; + np_uart_driver_api_0.poll_in = np_uart_tty_poll_in; + } else { /* NATIVE_UART_0_ON_STDINOUT */ + d->in_fd = np_uart_ptty_get_stdin_fileno(); + d->out_fd = np_uart_ptty_get_stdout_fileno(); + np_uart_driver_api_0.poll_in = np_uart_stdin_poll_in; + } + + return 0; +} + +#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) +/* + * Initialize the 2nd UART port. + * This port will be always attached to its own new pseudoterminal. + */ +static int np_uart_1_init(const struct device *dev) +{ + struct native_uart_status *d; + int tty_fn; + + d = (struct native_uart_status *)dev->data; + + tty_fn = np_uart_open_ptty(dev->name, NULL, false, wait_pts); + + d->in_fd = tty_fn; + d->out_fd = tty_fn; + + return 0; +} +#endif + +/* + * @brief Output a character towards the serial port + * + * @param dev UART device struct + * @param out_char Character to send. + */ +static void np_uart_poll_out(const struct device *dev, + unsigned char out_char) +{ + int ret; + struct native_uart_status *d = (struct native_uart_status *)dev->data; + + if (wait_pts) { + + while (1) { + int rc = np_uart_slave_connected(d->out_fd); + + if (rc == 1) { + break; + } + k_sleep(K_MSEC(100)); + } + } + + /* The return value of write() cannot be ignored (there is a warning) + * but we do not need the return value for anything. + */ + ret = nsi_host_write(d->out_fd, &out_char, 1); + (void) ret; +} + +/** + * @brief Poll the device for input. + * + * @param dev UART device structure. + * @param p_char Pointer to character. + * + * @retval 0 If a character arrived and was stored in p_char + * @retval -1 If no character was available to read + */ +static int np_uart_stdin_poll_in(const struct device *dev, + unsigned char *p_char) +{ + int in_f = ((struct native_uart_status *)dev->data)->in_fd; + static bool disconnected; + int rc; + + if (disconnected == true) { + return -1; + } + + rc = np_uart_stdin_poll_in_bottom(in_f, p_char); + if (rc == -2) { + disconnected = true; + return -1; + } + + return rc; +} + +/** + * @brief Poll the device for input. + * + * @param dev UART device structure. + * @param p_char Pointer to character. + * + * @retval 0 If a character arrived and was stored in p_char + * @retval -1 If no character was available to read + */ +static int np_uart_tty_poll_in(const struct device *dev, + unsigned char *p_char) +{ + int n = -1; + int in_f = ((struct native_uart_status *)dev->data)->in_fd; + + n = nsi_host_read(in_f, p_char, 1); + if (n == -1) { + return -1; + } + return 0; +} + +DEVICE_DT_INST_DEFINE(0, + &np_uart_0_init, NULL, + (void *)&native_uart_status_0, NULL, + PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, + &np_uart_driver_api_0); + +#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) +DEVICE_DT_INST_DEFINE(1, + &np_uart_1_init, NULL, + (void *)&native_uart_status_1, NULL, + PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, + &np_uart_driver_api_1); +#endif /* CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE */ + +static void auto_attach_cmd_cb(char *argv, int offset) +{ + auto_attach_cmd = &argv[offset]; + auto_attach = true; +} + +static void np_add_uart_options(void) +{ + if (!IS_ENABLED(CONFIG_NATIVE_UART_0_ON_OWN_PTY)) { + return; + } + + static struct args_struct_t uart_options[] = { + { + .is_switch = true, + .option = "attach_uart", + .type = 'b', + .dest = (void *)&auto_attach, + .descript = "Automatically attach to the UART terminal" + }, + { + .option = "attach_uart_cmd", + .name = "\"cmd\"", + .type = 's', + .call_when_found = auto_attach_cmd_cb, + .descript = "Command used to automatically attach to the terminal (implies " + "auto_attach), by default: " + "'" CONFIG_NATIVE_UART_AUTOATTACH_DEFAULT_CMD "'" + }, + IF_ENABLED(CONFIG_UART_NATIVE_WAIT_PTS_READY_ENABLE, ( + { + .is_switch = true, + .option = "wait_uart", + .type = 'b', + .dest = (void *)&wait_pts, + .descript = "Hold writes to the uart/pts until a client is connected/ready" + }, + )) + ARG_TABLE_ENDMARKER + }; + + native_add_command_line_opts(uart_options); +} + +static void np_cleanup_uart(void) +{ + if (IS_ENABLED(CONFIG_NATIVE_UART_0_ON_OWN_PTY)) { + if (native_uart_status_0.in_fd != 0) { + nsi_host_close(native_uart_status_0.in_fd); + } + } + +#if defined(CONFIG_UART_NATIVE_POSIX_PORT_1_ENABLE) + if (native_uart_status_1.in_fd != 0) { + nsi_host_close(native_uart_status_1.in_fd); + } +#endif +} + +NATIVE_TASK(np_add_uart_options, PRE_BOOT_1, 11); +NATIVE_TASK(np_cleanup_uart, ON_EXIT, 99); diff --git a/drivers/serial/uart_native_ptty_bottom.c b/drivers/serial/uart_native_ptty_bottom.c new file mode 100644 index 000000000000000..51348423cc98754 --- /dev/null +++ b/drivers/serial/uart_native_ptty_bottom.c @@ -0,0 +1,242 @@ +/* + * Copyright (c) 2018, Oticon A/S + * Copyright (c) 2023, Nordic Semiconductor ASA + * + * SPDX-License-Identifier: Apache-2.0 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ERROR nsi_print_error_and_exit +#define WARN nsi_print_warning + +/** + * @brief Poll the device for input. + * + * @param in_f Input file descriptor + * @param p_char Pointer to character. + * + * @retval 0 If a character arrived and was stored in p_char + * @retval -1 If no character was available to read + * @retval -2 if the stdin is disconnected + */ +int np_uart_stdin_poll_in_bottom(int in_f, unsigned char *p_char) +{ + if (feof(stdin)) { + /* + * The stdinput is fed from a file which finished or the user + * pressed Ctrl+D + */ + return -2; + } + + int n = -1; + + int ready; + fd_set readfds; + static struct timeval timeout; /* just zero */ + + FD_ZERO(&readfds); + FD_SET(in_f, &readfds); + + ready = select(in_f+1, &readfds, NULL, NULL, &timeout); + + if (ready == 0) { + return -1; + } else if (ready == -1) { + ERROR("%s: Error on select ()\n", __func__); + } + + n = read(in_f, p_char, 1); + if ((n == -1) || (n == 0)) { + return -1; + } + + return 0; +} + +/** + * @brief Check if the output descriptor has something connected to the slave side + * + * @param fd file number + * + * @retval 0 Nothing connected yet + * @retval 1 Something connected to the slave side + */ +int np_uart_slave_connected(int fd) +{ + struct pollfd pfd = { .fd = fd, .events = POLLHUP }; + int ret; + + ret = poll(&pfd, 1, 0); + if (ret == -1) { + int err = errno; + /* + * Possible errors are: + * * EINTR :A signal was received => ok + * * EFAULT and EINVAL: parameters/programming error + * * ENOMEM no RAM left + */ + if (err != EINTR) { + ERROR("%s: unexpected error during poll, errno=%i,%s\n", + __func__, err, strerror(err)); + } + } + if (!(pfd.revents & POLLHUP)) { + /* There is now a reader on the slave side */ + return 1; + } + return 0; +} + +/** + * Attempt to connect a terminal emulator to the slave side of the pty + * If -attach_uart_cmd= is provided as a command line option, will be + * used. Otherwise, the default command, + * CONFIG_NATIVE_UART_AUTOATTACH_DEFAULT_CMD, will be used instead + */ +static void attach_to_tty(const char *slave_tty, const char *auto_attach_cmd) +{ + char command[strlen(auto_attach_cmd) + strlen(slave_tty) + 1]; + + sprintf(command, auto_attach_cmd, slave_tty); + + int ret = system(command); + + if (ret != 0) { + WARN("Could not attach to the UART with \"%s\"\n", command); + WARN("The command returned %i\n", WEXITSTATUS(ret)); + } +} +/** + * Attempt to allocate and open a new pseudoterminal + * + * Returns the file descriptor of the master side + * If auto_attach was set, it will also attempt to connect a new terminal + * emulator to its slave side. + */ +int np_uart_open_ptty(const char *uart_name, const char *auto_attach_cmd, + bool do_auto_attach, bool wait_pts) +{ + int master_pty; + char *slave_pty_name; + struct termios ter; + int err_nbr; + int ret; + int flags; + + master_pty = posix_openpt(O_RDWR | O_NOCTTY); + if (master_pty == -1) { + ERROR("Could not open a new TTY for the UART\n"); + } + ret = grantpt(master_pty); + if (ret == -1) { + err_nbr = errno; + close(master_pty); + ERROR("Could not grant access to the slave PTY side (%i)\n", + err_nbr); + } + ret = unlockpt(master_pty); + if (ret == -1) { + err_nbr = errno; + close(master_pty); + ERROR("Could not unlock the slave PTY side (%i)\n", err_nbr); + } + slave_pty_name = ptsname(master_pty); + if (slave_pty_name == NULL) { + err_nbr = errno; + close(master_pty); + ERROR("Error getting slave PTY device name (%i)\n", err_nbr); + } + /* Set the master PTY as non blocking */ + flags = fcntl(master_pty, F_GETFL); + if (flags == -1) { + err_nbr = errno; + close(master_pty); + ERROR("Could not read the master PTY file status flags (%i)\n", + err_nbr); + } + + ret = fcntl(master_pty, F_SETFL, flags | O_NONBLOCK); + if (ret == -1) { + err_nbr = errno; + close(master_pty); + ERROR("Could not set the master PTY as non-blocking (%i)\n", + err_nbr); + } + + (void) err_nbr; + + /* + * Set terminal in "raw" mode: + * Not canonical (no line input) + * No signal generation from Ctr+{C|Z..} + * No echoing, no input or output processing + * No replacing of NL or CR + * No flow control + */ + ret = tcgetattr(master_pty, &ter); + if (ret == -1) { + ERROR("Could not read terminal driver settings\n"); + } + ter.c_cc[VMIN] = 0; + ter.c_cc[VTIME] = 0; + ter.c_lflag &= ~(ICANON | ISIG | IEXTEN | ECHO); + ter.c_iflag &= ~(BRKINT | ICRNL | IGNBRK | IGNCR | INLCR | INPCK + | ISTRIP | IXON | PARMRK); + ter.c_oflag &= ~OPOST; + ret = tcsetattr(master_pty, TCSANOW, &ter); + if (ret == -1) { + ERROR("Could not change terminal driver settings\n"); + } + + nsi_print_trace("%s connected to pseudotty: %s\n", + uart_name, slave_pty_name); + + if (wait_pts) { + /* + * This trick sets the HUP flag on the tty master, making it + * possible to detect a client connection using poll. + * The connection of the client would cause the HUP flag to be + * cleared, and in turn set again at disconnect. + */ + ret = open(slave_pty_name, O_RDWR | O_NOCTTY); + if (ret == -1) { + err_nbr = errno; + ERROR("%s: Could not open terminal from the slave side (%i,%s)\n", + __func__, err_nbr, strerror(err_nbr)); + } + ret = close(ret); + if (ret == -1) { + err_nbr = errno; + ERROR("%s: Could not close terminal from the slave side (%i,%s)\n", + __func__, err_nbr, strerror(err_nbr)); + } + } + if (do_auto_attach) { + attach_to_tty(slave_pty_name, auto_attach_cmd); + } + + return master_pty; +} + +int np_uart_ptty_get_stdin_fileno(void) +{ + return STDIN_FILENO; +} + +int np_uart_ptty_get_stdout_fileno(void) +{ + return STDOUT_FILENO; +} diff --git a/drivers/serial/uart_native_ptty_bottom.h b/drivers/serial/uart_native_ptty_bottom.h new file mode 100644 index 000000000000000..cc5ec282450f001 --- /dev/null +++ b/drivers/serial/uart_native_ptty_bottom.h @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2023, Nordic Semiconductor ASA + * + * SPDX-License-Identifier: Apache-2.0 + * + * "Bottom" of native ptty uart driver + * When built with the native_simulator this will be built in the runner context, + * that is, with the host C library, and with the host include paths. + */ + +#ifndef DRIVERS_SERIAL_UART_NATIVE_PTTY_BOTTOM_H +#define DRIVERS_SERIAL_UART_NATIVE_PTTY_BOTTOM_H + +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +/* Note: None of these functions are public interfaces. But internal to the native ptty driver */ + +int np_uart_stdin_poll_in_bottom(int in_f, unsigned char *p_char); +int np_uart_slave_connected(int fd); +int np_uart_open_ptty(const char *uart_name, const char *auto_attach_cmd, + bool do_auto_attach, bool wait_pts); +int np_uart_ptty_get_stdin_fileno(void); +int np_uart_ptty_get_stdout_fileno(void); + +#ifdef __cplusplus +} +#endif + +#endif /* DRIVERS_SERIAL_UART_NATIVE_PTTY_BOTTOM_H */