10-09-2001
You will need to reprogram your tty driver to do what you want. You will need to disable line processing, input processing, and signal generation to get that "any key" part working. The exact details vary depending on your tty driver. But it is probably documented on the termio man page.
You will do one ioctl to get the current params, change some, then do a second ioctl to put them back.
Something like this:
struct termio modes;
ioctl(fd, TCGETA, (char *) &modes);
modes.c_lflag &= ~(ISIG|ICANON);
modes.c_cc[VMIN] = 1;
modes.c_cc[VTIME] = 1;
ioctl(fd, TCSETA. (char *) &modes);
Now, I'm not sure if I got this right for my system let alone yours, but it should get you started.
You have a second problem in that getchar and printf are buffered. I think that your getchar would work but the printf won't output anything unless it happens to fill the buffer. So you will need to call setvbuf to set fd 1 to completely non-buffered.
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GETS(3) Linux Programmer's Manual GETS(3)
NAME
fgetc, fgets, getc, getchar, gets, ungetc - input of characters and strings
SYNOPSIS
#include <stdio.h>
int fgetc(FILE *stream);
char *fgets(char *s, int size, FILE *stream);
int getc(FILE *stream);
int getchar(void);
char *gets(char *s);
int ungetc(int c, FILE *stream);
DESCRIPTION
fgetc() reads the next character from stream and returns it as an unsigned char cast to an int, or EOF on end of file or error.
getc() is equivalent to fgetc() except that it may be implemented as a macro which evaluates stream more than once.
getchar() is equivalent to getc(stdin).
gets() reads a line from stdin into the buffer pointed to by s until either a terminating newline or EOF, which it replaces with '