gnuports@2rosenthals.com ?????????????? ????? #32

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???: "Dave Yeo" <gnuports@2rosenthals.com> ?? ???? ????????? ??: getting a single keypress ??: Sun, 15 May 2022 21:07:25 -0700 ??: GNU Ports for eCS Mailing List <gnuports@2rosenthals.com>

Trying to fix mpg123's key reading while playing a mp3, things like pause etc.
Example program that almost works from the developer, here it hangs and sometimes hangs the system.

-----------8<--------------

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/select.h>
#include <unistd.h>
#include <termios.h>

int term_fd = -1;

int get_key(int do_delay, char *val)
{
fd_set r;
struct timeval t;
t.tv_sec=0;
t.tv_usec=(do_delay) ? 1000 : 0;
FD_ZERO(&r);
FD_SET(term_fd,&r);
int n = select(term_fd+1,&r,NULL,NULL,&t);
if(n > 0 && FD_ISSET(term_fd,&r) && read(term_fd,val,1) == 1)
return 1;
return 0;
}


int main(int argc, char **argv)
{
if(argc >= 2)
term_fd = open("/dev/tty", O_RDONLY);
else
term_fd = STDIN_FILENO;
if(term_fd < 0)
{
perror("failure opening terminal input");
return 1;
}
fprintf(stderr, "terminal fd: %d\n", term_fd);

struct termios old_tio;
int termsetup = 0;
if(!tcgetattr(term_fd, &old_tio))
{
fprintf(stderr, "proper terminal setup\n");
struct termios tio = old_tio;
tio.c_lflag &= ~(ICANON|ECHO);
tio.c_cc[VMIN] = 1;
tio.c_cc[VTIME] = 0;
tcsetattr(term_fd,TCSANOW,&tio);
termsetup = 1;
}

char val = 0;
while(val != 'q')
{
if(get_key(1, &val))
fprintf(stderr, "got key: %c\n", val);
}

if(termsetup)
tcsetattr(term_fd,TCSAFLUSH,&old_tio);
if(term_fd > 0)
close(term_fd);
return 0;
}

------------>8--------------

Ideas or fixes?
Dave

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