/* opens a rs232 window, returns handle to give to functions below. */
int rs232dev_open(int device)
{
int i, fd;
for (i = 0; i < RS232_NUM_DEVICES; i++) {
if (!fds[i].inuse) {
break;
}
}
if (i >= RS232_NUM_DEVICES) {
log_error(rs232dev_log, "No more devices available.");
return -1;
}
#ifdef DEBUG
log_message(rs232dev_log, "rs232dev_open(device=%d).", device);
#endif
if (rs232_devfile[device][0] == '|') {
#if defined(OPENSTEP_COMPILE) || defined(RHAPSODY_COMPILE) \
|| defined(NEXTSTEP_COMPILE)
log_error(rs232dev_log, "Forking not supported on this platform.");
return -1;
#else
if (fork_coproc(&fds[i].fd_w, &fds[i].fd_r, rs232_devfile[device] + 1) < 0) {
log_error(rs232dev_log, "Cannot fork process.");
return -1;
}
#endif
fds[i].type = T_PROC;
fds[i].inuse = 1;
fds[i].file = rs232_devfile[device];
} else {
#if !defined(OPENSTEP_COMPILE) && !defined(NEXTSTEP_COMPILE)
fd = open(rs232_devfile[device], O_RDWR | O_NOCTTY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd < 0) {
log_error(rs232dev_log, "Cannot open file \"%s\": %s", rs232_devfile[device], strerror(errno));
return -1;
}
fds[i].fd_r = fds[i].fd_w = fd;
fds[i].file = rs232_devfile[device];
if (isatty(fd)) {
fds[i].type = T_TTY;
set_tty(i, devbaud[device]);
} else {
fds[i].type = T_FILE;
}
fds[i].inuse = 1;
#endif
}
return i;
}
/*
* TODO: only do this on systems which support it.
*/
FILE *fopen_or_pipe(char *name)
{
if (name[0] == '|') {
#if COPROC_SUPPORT
int fd_rd, fd_wr;
if (fork_coproc(&fd_wr, &fd_rd, name + 1) < 0) {
/* error */
return NULL;
}
close(fd_rd); /* We only want to write to the process */
return fdopen(fd_wr, MODE_WRITE);
#else
log_error(LOG_DEFAULT, "Cannot fork process.");
return NULL;
#endif
} else {
return fopen(name, MODE_APPEND);
}
}
