termios

问题 I want to implement auto-completion feature for my CLI application. The default behavior of getc() is returning only when the following list of characters are entered: NEW_LINE or EOF. I want to add TAB to this list so that I can trigger my auto-completion algorithm. Is there a way to do it, for instance, using termios? The editline library (http://www.thrysoee.dk/editline/) can do it but I could not figure how it does? 回答1: Handling of terminal IO takes about 40 pages in the second edition

问题 When I use this piece of code in canonical mode: #include <stdio.h> #include <termios.h> #include <unistd.h> static struct termios newt; static struct termios oldt; static void kb_fini(void) { tcsetattr(STDIN_FILENO, TCSANOW, &oldt); } void kb_init(void) { tcgetattr(STDIN_FILENO, &oldt); newt = oldt; newt.c_lflag &= (tcflag_t)~(ICANON | ECHO | ISIG); newt.c_cc[VMIN] = 1; newt.c_cc[VTIME] = 0; tcsetattr(STDIN_FILENO, TCSANOW, &newt); atexit(kb_fini); } int main(void) { int c; kb_init(); printf

问题 What I want to achieve: I want to set custom baud rate values for some tty* -like UART -mapped terminals. How: The only way I found by far is to use the struct termios2 structure which is located in <asm/termios> header (as mentioned here, first answer). My solution works very well by far, but now I need to use some functions: speed_t cfgetispeed(const struct termios *); int tcdrain(int); int tcflow(int, int); int tcflush(int, int); int tcgetattr(int, struct termios *); pid_t tcgetsid(int);

问题 How do I enter raw or cbreak mode under WSL? I want keyboard input available to stdin immediately, instead of waiting for enter key. I've tried using termios to put the TTY in raw or canonical mode, either by using cfmakeraw or by fiddling with various flags, following the example from the termios manual page and several variations (only disabling ICANON , code similar to ncurses internals, and so on): termios_p->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);

问题 Does Linux buffer keys typed in terminal so that you can read them later one key at a time ? I am asking because I want to catch ESC and arrow key presses and can't find a way to reliably read the codes. I put terminal in non-canonical mode and want program to block if there is no input, but if there is, I want to fetch only one key press for processing. Update 2 : Arrow keys is just an example. I need to identify key presses even for the keys with unknown escape sequences for my program.

问题 I'm attempting to read from a serial port ( /dev/ttyS4 ) on a BeagleBone Black, but I think(?) this should apply to all Linux devices in general. Currently, I can set up minicom with a baud rate of 9600 and 8N1 data to read from the serial port correctly. However, if I attempt to directly cat /dev/ttyS4 , nothing shows up in my terminal. My code also does this, and returns a Resource temporarily unavailable error, which I suspect is what is happening with the cat command. If I run stty -F

问题 The functions below are used consequently to read data from serial port under Linux. I can read the complete data when I debug, but when I launch the program, read_buffer seems not to be complete. I receive the small part of the data correctly but the rest of the buffer is completely zero . What could be the problem? int8_t __serial_port_open(uint8_t *port) { mode_t perms = S_IRWXU; fd = open(port, O_RDWR | O_NOCTTY | O_SYNC, perms); if (fd < 0) { return -1; } if (__serial_port_configure() !=

问题 I have been looking int the man 3 tcgetattr (as I want to change the terminal settings in a program) and found this. int tcgetattr(int fd, struct termios *termios_p); int tcsetattr(int fd, int optional_actions, const struct termios *termios_p); Question: I would like to know what fd should mean? (it seems to be stdin , yet I do not understand why)? Background My comprehension is that terminal is input and output together, as my understanding was that a /dev/tty or /dev/pty yields stdin ,

问题 I am trying to interface a contact-less smart card reader over UART (usbserial) using termios framework under Linux. The code works fine on the PC, but when I cross-compile and try it out on an ARM9 target, it is able to open the device and even writing the command to the device, but the read command blocks indefinitely. Here is the code snippet : int mifare_rdr_init(struct mifare_1K * ptr, char *rdr_devnode) { bzero(ptr, sizeof(struct mifare_1K)); // zero the entire structure // open serial

问题 I'm attempting to read and write data from and to an FPGA board. The board itself came with a driver that create a terminal device called ttyUSB0 whenever the board is plugged in. On the FPGA, an asynchronous receiver and transmitter were implemented, and they seem to work. However, there seems to be an issue on C side of things. I've been using some test vectors to test if the FPGA is outputting the proper information. I've noticed a few things things: The device sometimes does not open