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#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include "ttyutils.h"
#include "pathnames.h"
static struct speed_struct {
int user_speed;
speed_t termios_speed;
} speed_table[] = {
{300, B300},
{600, B600},
{1200, B1200},
{2400, B2400},
{4800, B4800},
{9600, B9600},
{19200, B19200},
{38400, B38400},
#ifdef B57600
{57600, B57600},
#endif
#ifdef B115200
{115200, B115200},
#endif
#ifdef B230400
{230400, B230400},
#endif
#ifdef B460800
{460800, B460800},
#endif
{-1, B0}
};
int tty_raw(int fd, int hwflag)
{
struct termios term;
if (tcgetattr(fd, &term) == -1) {
perror("tty_raw: tcgetattr");
return FALSE;
}
term.c_cc[VMIN] = 1;
term.c_cc[VTIME] = 0;
term.c_iflag = IGNBRK | IGNPAR;
term.c_oflag = 0;
term.c_lflag = 0;
#ifdef CIBAUD
term.c_cflag = (term.c_cflag & (CBAUD | CIBAUD)) | CREAD | CS8 | CLOCAL;
#else
term.c_cflag = (term.c_cflag & CBAUD) | CREAD | CS8 | CLOCAL;
#endif
if (hwflag)
term.c_cflag |= CRTSCTS;
if (tcsetattr(fd, TCSANOW, &term) == -1) {
perror("tty_raw: tcsetattr");
return FALSE;
}
return TRUE;
}
int tty_speed(int fd, int speed)
{
struct termios term;
struct speed_struct *s;
for (s = speed_table; s->user_speed != -1; s++)
if (s->user_speed == speed)
break;
if (s->user_speed == -1) {
fprintf(stderr, "tty_speed: invalid speed %d\n", speed);
return FALSE;
}
if (tcgetattr(fd, &term) == -1) {
perror("tty_speed: tcgetattr");
return FALSE;
}
cfsetispeed(&term, s->termios_speed);
cfsetospeed(&term, s->termios_speed);
if (tcsetattr(fd, TCSANOW, &term) == -1) {
perror("tty_speed: tcsetattr");
return FALSE;
}
return TRUE;
}
int tty_is_locked(char *tty)
{
char buffer[50], *s;
FILE *fp;
int pid = 0;
if ((s = strrchr(tty, '/')) != NULL)
s++;
else
s = tty;
sprintf(buffer, "%s/LCK..%s", LOCK_SERIAL_DIR, s);
if ((fp = fopen(buffer, "r")) == NULL)
return FALSE;
if (fscanf(fp, "%d", &pid) != 1) {
fclose(fp);
return FALSE;
}
fclose(fp);
if (kill(pid, 0) == 0)
return TRUE;
return FALSE;
}
int tty_lock(char *tty)
{
char buffer[50], *s;
FILE *fp;
if ((s = strrchr(tty, '/')) != NULL)
s++;
else
s = tty;
sprintf(buffer, "%s/LCK..%s", LOCK_SERIAL_DIR, s);
if ((fp = fopen(buffer, "w")) == NULL)
return FALSE;
fprintf(fp, "%10d\n", getpid());
fclose(fp);
return TRUE;
}
int tty_unlock(char *tty)
{
char buffer[50], *s;
if ((s = strrchr(tty, '/')) != NULL)
s++;
else
s = tty;
sprintf(buffer, "%s/LCK..%s", LOCK_SERIAL_DIR, s);
return unlink(buffer) == 0;
}
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