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diff --git a/docs/stackoverflow.com_questions_4327942_non-buffering-stdin-reading.txt b/docs/stackoverflow.com_questions_4327942_non-buffering-stdin-reading.txt new file mode 100644 index 0000000..2a6bb30 --- /dev/null +++ b/docs/stackoverflow.com_questions_4327942_non-buffering-stdin-reading.txt @@ -0,0 +1,725 @@ + #[1]Stack Overflow [2]Feed for question 'non-buffering stdin reading' + + [3]Stack Overflow + 1. [4]About + 2. [5]Products + 3. [6]For Teams + + 1. [7]Stack Overflow Public questions & answers + 2. [8]Stack Overflow for Teams Where developers & technologists share + private knowledge with coworkers + 3. [9]Talent Build your employer brand + 4. [10]Advertising Reach developers & technologists worldwide + 5. [11]Labs The future of collective knowledge sharing + 6. 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But in fact *s is + printed only after '\n' in the console. So seems like stdin (file with + desc 0) is buffered. But the read function is buffer-less, isn't it? + Where am I wrong. + + UPD: I use linux. + + So the solution is +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <termios.h> + +int main(int argc, char *argv[], char *envp[]) { + int fd[2]; + + if(pipe(fd) < 0) { + printf("Can\'t create pipe\n"); + exit(-1); + } + + struct termios term, term_orig; + + if(tcgetattr(0, &term_orig)) { + printf("tcgetattr failed\n"); + exit(-1); + } + + term = term_orig; + + term.c_lflag &= ~ICANON; + term.c_lflag |= ECHO; + term.c_cc[VMIN] = 0; + term.c_cc[VTIME] = 0; + + if (tcsetattr(0, TCSANOW, &term)) { + printf("tcsetattr failed\n"); + exit(-1); + } + + pid_t fpid = fork(); + if (fpid == 0) { + close(0); + close(fd[1]); + char *s = (char *) malloc(sizeof(char)); + while(1) if (read(fd[0], s, 1)) printf("%i\n", *s); + } + close(fd[0]); + char *c = (char *) malloc(sizeof(char)); + while (1) { + if (read(0, c, 1) > 0) write(fd[1], c, 1); + } + return 0; +} + + * [37]c + * [38]linux + * [39]unix + * [40]posix + + [41]Share + (BUTTON) Follow + [42]edited Dec 1, 2010 at 19:10 + Ximik + asked Dec 1, 2010 at 18:54 + Ximik's user avatar + [43]XimikXimik + 2,45533 gold badges2727 silver badges5353 bronze badges + 2 + * 1 + Note that this has nothing to do with buffering. + - [44]Simon Tóth + Dec 1, 2010 at 19:05 + * Shouldn't the code reset the terminal attributes in the parent to + term_orig before exiting? You should probably also have the child + exit at some point -- it will continually get 0 from read() after + the parent shuts up shop. However, the parent is also in an + infinite loop; the processes only end when signalled. You really + need a signal handler that calls tcsetattr() with the original + terminal values for the main signals you're likely to get (that can + be handled): HUP, INT, QUIT perhaps, PIPE and TERM is a good set. + You can't do anything about KILL or STOP, of course. + - [45]Jonathan Leffler + Jan 19, 2021 at 3:27 + + [46]Add a comment | + +3 Answers 3 + + Sorted by: [47]Reset to default + [Highest score (default)___________] + (BUTTON) + 15 + (BUTTON) (BUTTON) + + Unfortunately, the behavior you're looking for is not possible with + standard ANSI C, and the default mode for UNIX terminal I/O is + line-oriented, which means you will always need an inputted \n + character to retrieve the input. You'll need to use terminal I/O + facilities that let you program in [48]non-canonical mode, so that each + key-press triggers an event. On Linux/UNIX, you can look into the + <termios.h> header, or the [49]ncurses library. + [50]Share + (BUTTON) Follow + [51]edited May 23, 2017 at 10:29 + Community's user avatar + [52]CommunityBot + 111 silver badge + answered Dec 1, 2010 at 18:56 + Charles Salvia's user avatar + [53]Charles SalviaCharles Salvia + 52.6k1414 gold badges130130 silver badges142142 bronze badges + 1 + * 4 + @Ximik, yes and they are not using standard ANSI C. Most use + external libraries such as ncurses or termcap. + - [54]Charles Salvia + Dec 1, 2010 at 18:59 + + [55]Add a comment | + (BUTTON) + 5 + (BUTTON) (BUTTON) + + It seems to me that your solution is a little bit complicated. Still + don't understand why do you need pipe and 2 process. +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <termios.h> + +int main(int argc, char *argv[], char *envp[]) { + struct termios term, term_orig; + + if(tcgetattr(0, &term_orig)) { + printf("tcgetattr failed\n"); + exit(-1); + } + + term = term_orig; + + term.c_lflag &= ~ICANON; + term.c_lflag |= ECHO; + term.c_cc[VMIN] = 0; + term.c_cc[VTIME] = 0; + + if (tcsetattr(0, TCSANOW, &term)) { + printf("tcsetattr failed\n"); + exit(-1); + } + + char ch; + while (1) { + if (read(0, &ch, 1) > 0) + printf(" %d\n", ch); + } + return 0; +} + + [56]Share + (BUTTON) Follow + [57]edited Dec 30, 2014 at 12:56 + answered Dec 30, 2014 at 12:14 + Sam Toliman's user avatar + [58]Sam TolimanSam Toliman + 12311 silver badge55 bronze badges + + [59]Add a comment | + (BUTTON) + 3 + (BUTTON) (BUTTON) + + Unix buffers your tty characters inside the kernel in part so that + programs don't have to individually handle line editing unless they + want to. + + You can instruct the tty driver to give you the bytes immediately. + There are various libraries that make this a bit easier than using the + raw ioctl. You might start with termios(3). + [60]Share + (BUTTON) Follow + answered Dec 1, 2010 at 18:59 + DigitalRoss's user avatar + [61]DigitalRossDigitalRoss + 144k2525 gold badges250250 silver badges330330 bronze badges + 1 + * 3 + And sadly nobody got around to improving this kernel-level line + editing to make it actually usable... In principle it could be + nearly as nice as readline. + - [62]R.. GitHub STOP HELPING ICE + Dec 1, 2010 at 20:46 + + [63]Add a comment | + +Your Answer + + Reminder: Answers generated by artificial intelligence tools are not + allowed on Stack Overflow. 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