int cmd_ctty(char *param)
{ int f, attr, failed;
if(!param || !*param) {
displayString(TEXT_CMDHELP_CTTY);
return 1;
}
#ifdef DEBUG
devAttr(0);
devAttr(1);
devAttr(2);
#endif
if((f = devopen(param, O_RDWR)) < 0) {
error_no_rw_device(param);
return 1;
}
if(((attr = fdattr(f)) & 0x80) == 0
|| write(f, "\r\n", 2) != 2) { /* need \r as in bin mode */
close(f);
error_no_rw_device(param);
return 1;
}
/* Now inform the system that this device is the new console
now; STDIN and STDOUT flag are the most lowest two bits */
fdsetattr(f, (attr & 0xFF) | 0x03);
fflush(stdin); /* prepare asynchroneous changes of internal fd's */
fflush(stdout);
fflush(stderr);
/* Now change the file descriptors:
0 := rdonly
1,2 := wronly
if CTTY is called within a pipe or its I/O is redirected,
oldinfd or oldoutfd is not equal to -1. In such case the
old*fd is modified in order to effect the file descriptor
after the redirections are restored. Otherwise a pipe or
redirection would left CTTY in a half-made status.
*/
failed = dup2(f, 2); /* no redirection support */
if(oldinfd != -1)
close(oldinfd);
oldinfd = f;
if(oldoutfd != -1)
close(oldoutfd);
if((oldoutfd = dup(f)) == -1)
failed = 1;
if(failed)
error_ctty_dup(param);
return failed;
}
int cmd_ctty(char *param)
{ int fin, fout;
int failed;
if(!param || !*param) {
displayString(TEXT_CMDHELP_CTTY);
return 1;
}
#ifdef DEBUG
devAttr(0);
devAttr(1);
devAttr(2);
#endif
if((fin = devopen(param, O_BINARY | O_RDONLY)) < 0
|| (fout = devopen(param, O_BINARY | O_WRONLY)) < 0) {
close(fin); /* if fin failed, close(-1) won't hurt */
error_no_rw_device(param);
return 1;
}
fflush(stdin); /* prepare asynchroneous changes of internal fd's */
fflush(stdout);
fflush(stderr);
/* Now change the file descriptors:
0 := rdonly
1,2 := wronly
if CTTY is called within a pipe or its I/O is redirected,
oldinfd or oldoutfd is not equal to -1. In such case the
old*fd is modified in order to effect the file descriptor
after the redirections are restored. Otherwise a pipe or
redirection would left CTTY in a half-made status.
*/
failed = dup2(fout, 2); /* no redirection support */
if(oldinfd == -1) { /* stdin not redirected */
failed = dup2(fin, 0) || failed;
close(fin);
} else oldinfd = fin;
if(oldoutfd == -1) { /* stdout not redirected */
failed = dup2(fout, 1) || failed;
close(fout);
} else oldoutfd = fout;
if(failed)
error_ctty_dup(param);
return failed;
}
