int
main(int argc, char *argv[])
{
int flags, j, cnt;
struct termios origTermios;
char ch;
struct sigaction sa;
Boolean done;
/* Establish handler for "I/O possible" signal */
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = sigioHandler;
if (sigaction(SIGIO, &sa, NULL) == -1)
errExit("sigaction");
/* Set owner process that is to receive "I/O possible" signal */
if (fcntl(STDIN_FILENO, F_SETOWN, getpid()) == -1)
errExit("fcntl(F_SETOWN)");
/* Enable "I/O possible" signaling and make I/O nonblocking
for file descriptor */
flags = fcntl(STDIN_FILENO, F_GETFL);
if (fcntl(STDIN_FILENO, F_SETFL, flags | O_ASYNC | O_NONBLOCK) == -1)
errExit("fcntl(F_SETFL)");
/* Place terminal in cbreak mode */
if (ttySetCbreak(STDIN_FILENO, &origTermios) == -1)
errExit("ttySetCbreak");
for (done = FALSE, cnt = 0; !done ; cnt++) {
for (j = 0; j < 100000000; j++)
continue; /* Slow main loop down a little */
if (gotSigio) { /* Is input available? */
gotSigio = 0;
/* Read all available input until error (probably EAGAIN)
or EOF (not actually possible in cbreak mode) or a
hash (#) character is read */
while (read(STDIN_FILENO, &ch, 1) > 0 && !done) {
printf("cnt=%d; read %c\n", cnt, ch);
done = ch == '#';
}
}
}
/* Restore original terminal settings */
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &origTermios) == -1)
errExit("tcsetattr");
exit(EXIT_SUCCESS);
}
int main()
{
int fd = STDIN_FILENO;
int flags = fcntl(fd, F_GETFL);
char ch;
int done, cnt, j;
struct sigaction sa;
struct termios orig_termios;
/* handler for i/o possible signal */
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = sigio_handler;
if (sigaction(SIGIO, &sa, NULL) == -1) {
return err_exit("sigaction");
}
/* set owner, enable SIGIO signalling */
if (fcntl(fd, F_SETOWN, getpid()) == -1) {
return err_exit("fcntl(F_SETOWN)");
}
if (fcntl(fd, F_SETFL, flags | O_ASYNC | O_NONBLOCK) == -1) {
return err_exit("fcntl(F_SETFL)");
}
/* Do processing over the terminal until we ask it to exit */
/* Place terminal in cbreak mode */
if (ttySetCbreak(fd, &orig_termios) == -1) {
return err_exit("ttySetCbreak");
}
for (done = 0, cnt = 0; !done ; cnt++) {
/* Slow main loop down a little */
for (j = 0; j < 100000000; j++)
continue;
if (gotSigio) {
/* Is input available? */
/* Read all available input until error
(probably EAGAIN)
or EOF (not actually possible in cbreak mode)
or a hash (#) character is read */
while (read(fd, &ch, 1) > 0 && !done) {
printf("cnt=%d; read %c\n", cnt, ch);
done = (ch == '#');
}
gotSigio = 0;
}
}
/* Restore original terminal settings */
if (tcsetattr(fd, TCSAFLUSH, &orig_termios) == -1)
return err_exit("tcsetattr");
return 0;
}
int
main(int argc, char *argv[])
{
char ch;
struct sigaction sa, prev;
ssize_t n;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (argc > 1) { /* Use cbreak mode */
if (ttySetCbreak(STDIN_FILENO, &userTermios) == -1)
errExit("ttySetCbreak");
/* Terminal special characters can generate signals in cbreak
mode. Catch them so that we can adjust the terminal mode.
We establish handlers only if the signals are not being ignored. */
sa.sa_handler = handler;
if (sigaction(SIGQUIT, NULL, &prev) == -1)
errExit("sigaction");
if (prev.sa_handler != SIG_IGN)
if (sigaction(SIGQUIT, &sa, NULL) == -1)
errExit("sigaction");
if (sigaction(SIGINT, NULL, &prev) == -1)
errExit("sigaction");
if (prev.sa_handler != SIG_IGN)
if (sigaction(SIGINT, &sa, NULL) == -1)
errExit("sigaction");
sa.sa_handler = tstpHandler;
if (sigaction(SIGTSTP, NULL, &prev) == -1)
errExit("sigaction");
if (prev.sa_handler != SIG_IGN)
if (sigaction(SIGTSTP, &sa, NULL) == -1)
errExit("sigaction");
} else { /* Use raw mode */
if (ttySetRaw(STDIN_FILENO, &userTermios) == -1)
errExit("ttySetRaw");
}
sa.sa_handler = handler;
if (sigaction(SIGTERM, &sa, NULL) == -1)
errExit("sigaction");
setbuf(stdout, NULL); /* Disable stdout buffering */
for (;;) { /* Read and echo stdin */
n = read(STDIN_FILENO, &ch, 1);
if (n == -1) {
errMsg("read");
break;
}
if (n == 0) /* Can occur after terminal disconnect */
break;
if (isalpha((unsigned char) ch)) /* Letters --> lowercase */
putchar(tolower((unsigned char) ch));
else if (ch == '\n' || ch == '\r')
putchar(ch);
else if (iscntrl((unsigned char) ch))
printf("^%c", ch ^ 64); /* Echo Control-A as ^A, etc. */
else
putchar('*'); /* All other chars as '*' */
if (ch == 'q') /* Quit loop */
break;
}
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &userTermios) == -1)
errExit("tcsetattr");
exit(EXIT_SUCCESS);
}
