binutils-gdb/gdb/ser-unix.c
1993-05-06 22:17:10 +00:00

393 lines
8.1 KiB
C

/* Serial interface for local (hardwired) serial ports on Un*x like systems
Copyright 1992, 1993 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "serial.h"
#include <fcntl.h>
#include <sys/types.h>
#include <sys/time.h>
#if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
#define HAVE_SGTTY
#endif
#ifdef HAVE_TERMIOS
#include <termios.h>
#include <unistd.h>
#endif
#ifdef HAVE_TERMIO
#include <termio.h>
#endif
#ifdef HAVE_SGTTY
#include <sgtty.h>
#endif
static int hardwire_open PARAMS ((serial_t scb, const char *name));
static void hardwire_raw PARAMS ((serial_t scb));
static int wait_for PARAMS ((serial_t scb, int timeout));
static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
static int rate_to_code PARAMS ((int rate));
static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
static void hardwire_restore PARAMS ((serial_t scb));
static void hardwire_close PARAMS ((serial_t scb));
/* Open up a real live device for serial I/O */
static int
hardwire_open(scb, name)
serial_t scb;
const char *name;
{
scb->fd = open (name, O_RDWR);
if (scb->fd < 0)
return -1;
return 0;
}
static void
hardwire_raw(scb)
serial_t scb;
{
#ifdef HAVE_TERMIOS
struct termios termios;
if (tcgetattr(scb->fd, &termios))
{
fprintf(stderr, "tcgetattr failed: %s\n", safe_strerror(errno));
}
termios.c_iflag = 0;
termios.c_oflag = 0;
termios.c_lflag = 0;
termios.c_cflag &= ~(CSIZE|PARENB);
termios.c_cflag |= CS8;
termios.c_cc[VMIN] = 0;
termios.c_cc[VTIME] = 0;
if (tcsetattr(scb->fd, TCSANOW, &termios))
{
fprintf(stderr, "tcsetattr failed: %s\n", safe_strerror(errno));
}
#endif
#ifdef HAVE_TERMIO
struct termio termio;
if (ioctl (scb->fd, TCGETA, &termio))
{
fprintf(stderr, "TCGETA failed: %s\n", safe_strerror(errno));
}
termio.c_iflag = 0;
termio.c_oflag = 0;
termio.c_lflag = 0;
termio.c_cflag &= ~(CSIZE|PARENB);
termio.c_cflag |= CS8;
termio.c_cc[VMIN] = 0;
termio.c_cc[VTIME] = 0;
if (ioctl (scb->fd, TCSETA, &termio))
{
fprintf(stderr, "TCSETA failed: %s\n", safe_strerror(errno));
}
#endif
#ifdef HAVE_SGTTY
struct sgttyb sgttyb;
if (ioctl (scb->fd, TIOCGETP, &sgttyb))
fprintf(stderr, "TIOCGETP failed: %s\n", safe_strerror(errno));
sgttyb.sg_flags |= RAW | ANYP;
sgttyb.sg_flags &= ~(CBREAK | ECHO);
if (ioctl (scb->fd, TIOCSETP, &sgttyb))
fprintf(stderr, "TIOCSETP failed: %s\n", safe_strerror(errno));
#endif
scb->current_timeout = 0;
}
/* Wait for input on scb, with timeout seconds. Returns 0 on success,
otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
For termio{s}, we actually just setup VTIME if necessary, and let the
timeout occur in the read() in hardwire_read().
*/
static int
wait_for(scb, timeout)
serial_t scb;
int timeout;
{
int numfds;
#ifdef HAVE_SGTTY
struct timeval tv;
fd_set readfds;
FD_ZERO (&readfds);
tv.tv_sec = timeout;
tv.tv_usec = 0;
FD_SET(scb->fd, &readfds);
if (timeout >= 0)
numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
else
numfds = select(scb->fd+1, &readfds, 0, 0, 0);
if (numfds <= 0)
if (numfds == 0)
return SERIAL_TIMEOUT;
else
return SERIAL_ERROR; /* Got an error from select or poll */
return 0;
#endif /* HAVE_SGTTY */
#if defined HAVE_TERMIO || defined HAVE_TERMIOS
if (timeout == scb->current_timeout)
return 0;
{
#ifdef HAVE_TERMIOS
struct termios termios;
if (tcgetattr(scb->fd, &termios))
fprintf(stderr, "wait_for() tcgetattr failed: %s\n", safe_strerror(errno));
termios.c_cc[VTIME] = timeout * 10;
if (tcsetattr(scb->fd, TCSANOW, &termios))
fprintf(stderr, "wait_for() tcsetattr failed: %s\n", safe_strerror(errno));
#endif /* HAVE_TERMIOS */
#ifdef HAVE_TERMIO
struct termio termio;
if (ioctl (scb->fd, TCGETA, &termio))
fprintf(stderr, "wait_for() TCGETA failed: %s\n", safe_strerror(errno));
termio.c_cc[VTIME] = timeout * 10;
if (ioctl (scb->fd, TCSETA, &termio))
fprintf(stderr, "TCSETA failed: %s\n", safe_strerror(errno));
#endif /* HAVE_TERMIO */
scb->current_timeout = timeout;
return 0;
}
#endif /* HAVE_TERMIO || HAVE_TERMIOS */
}
/* Read a character with user-specified timeout. TIMEOUT is number of seconds
to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
char if successful. Returns -2 if timeout expired, EOF if line dropped
dead, or -3 for any other error (see errno in that case). */
static int
hardwire_readchar(scb, timeout)
serial_t scb;
int timeout;
{
int status;
if (scb->bufcnt-- > 0)
return *scb->bufp++;
status = wait_for(scb, timeout);
if (status < 0)
return status;
scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
if (scb->bufcnt <= 0)
if (scb->bufcnt == 0)
return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
distinguish between EOF & timeouts
someday] */
else
return SERIAL_ERROR; /* Got an error from read */
scb->bufcnt--;
scb->bufp = scb->buf;
return *scb->bufp++;
}
#ifndef B19200
#define B19200 EXTA
#endif
#ifndef B38400
#define B38400 EXTB
#endif
/* Translate baud rates from integers to damn B_codes. Unix should
have outgrown this crap years ago, but even POSIX wouldn't buck it. */
static struct
{
int rate;
int code;
}
baudtab[] =
{
{50, B50},
{75, B75},
{110, B110},
{134, B134},
{150, B150},
{200, B200},
{300, B300},
{600, B600},
{1200, B1200},
{1800, B1800},
{2400, B2400},
{4800, B4800},
{9600, B9600},
{19200, B19200},
{38400, B38400},
{-1, -1},
};
static int
rate_to_code(rate)
int rate;
{
int i;
for (i = 0; baudtab[i].rate != -1; i++)
if (rate == baudtab[i].rate)
return baudtab[i].code;
return -1;
}
static int
hardwire_setbaudrate(scb, rate)
serial_t scb;
int rate;
{
#ifdef HAVE_TERMIOS
struct termios termios;
if (tcgetattr (scb->fd, &termios))
return -1;
cfsetospeed (&termios, rate_to_code (rate));
cfsetispeed (&termios, rate_to_code (rate));
if (tcsetattr (scb->fd, TCSANOW, &termios))
return -1;
#endif
#ifdef HAVE_TERMIO
struct termio termio;
if (ioctl (scb->fd, TCGETA, &termio))
return -1;
#ifndef CIBAUD
#define CIBAUD CBAUD
#endif
termio.c_cflag &= ~(CBAUD | CIBAUD);
termio.c_cflag |= rate_to_code (rate);
if (ioctl (scb->fd, TCSETA, &termio))
return -1;
#endif
#ifdef HAVE_SGTTY
struct sgttyb sgttyb;
if (ioctl (scb->fd, TIOCGETP, &sgttyb))
return -1;
sgttyb.sg_ispeed = rate_to_code (rate);
sgttyb.sg_ospeed = rate_to_code (rate);
if (ioctl (scb->fd, TIOCSETP, &sgttyb))
return -1;
#endif
return 0;
}
static int
hardwire_write(scb, str, len)
serial_t scb;
const char *str;
int len;
{
int cc;
while (len > 0)
{
cc = write(scb->fd, str, len);
if (cc < 0)
return 1;
len -= cc;
str += cc;
}
return 0;
}
static void
hardwire_restore(scb)
serial_t scb;
{
}
static void
hardwire_close(scb)
serial_t scb;
{
if (scb->fd < 0)
return;
close(scb->fd);
scb->fd = -1;
}
static struct serial_ops hardwire_ops =
{
"hardwire",
0,
hardwire_open,
hardwire_close,
hardwire_readchar,
hardwire_write,
hardwire_raw,
hardwire_restore,
hardwire_setbaudrate
};
void
_initialize_ser_hardwire ()
{
serial_add_interface (&hardwire_ops);
}