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[34]non-buffering stdin reading
[35]Ask Question
Asked 13 years, 1 month ago
Modified [36]9 years ago
Viewed 6k times
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9
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My test application is
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
int main(int argc, char *argv[], char *envp[]) {
int fd[2];
if(pipe(fd) < 0) {
printf("Can\'t create pipe\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;
}
I want to see char-code after each entered char. 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
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[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
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15
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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
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[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 |
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5
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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
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[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 |
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3
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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
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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. [64]Learn more
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