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/* Remote serial interface for OS's with termios, for GDB.
Copyright 1992 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 <fcntl.h>
#include <sys/time.h>
#include "serial.h"
static int desc = -1;
void
serial_raw(fd, oldstate)
int fd;
struct ttystate *oldstate;
{
struct termios termios;
oldstate->flags = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, oldstate->flags|FNDELAY);
if (tcgetattr(fd, &termios))
{
fprintf(stderr, "tcgetattr failed: %s\n", safe_strerror(errno));
}
oldstate->termios = termios;
termios.c_iflag = 0;
termios.c_oflag = 0;
termios.c_lflag = 0;
termios.c_cc[VMIN] = 0;
termios.c_cc[VTIME] = 0;
if (tcsetattr(fd, TCSANOW, &termios))
{
fprintf(stderr, "tcsetattr failed: %s\n", safe_strerror(errno));
}
}
void
serial_restore(fd, oldstate)
int fd;
struct ttystate *oldstate;
{
fcntl(fd, F_SETFL, oldstate->flags);
tcsetattr(fd, TCSANOW, &oldstate->termios);
}
static struct ttystate oldstate;
static fd_set readfds;
int
serial_open(name)
const char *name;
{
struct termios termios;
desc = open (name, O_RDWR);
if (desc < 0)
error("Open of %s failed: %s", name, safe_strerror(errno));
serial_raw(desc, &oldstate);
/* Setup constant stuff for select */
FD_ZERO(&readfds);
return desc;
}
/* 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). */
int
serial_readchar(timeout)
int timeout;
{
static unsigned char buf[BUFSIZ];
static unsigned char *bufp;
static int bufcnt = 0;
int numfds;
struct timeval tv;
if (bufcnt-- > 0)
return *bufp++;
tv.tv_sec = timeout;
tv.tv_usec = 0;
FD_SET(desc, &readfds);
if (timeout >= 0)
numfds = select(desc+1, &readfds, 0, 0, &tv);
else
numfds = select(desc+1, &readfds, 0, 0, 0);
if (numfds <= 0)
if (numfds == 0)
return -2; /* Timeout */
else
return -3; /* Got an error from select */
bufcnt = read(desc, buf, BUFSIZ);
if (bufcnt <= 0)
if (bufcnt == 0)
return EOF; /* 0 chars means end of file */
else
return -3; /* Got an error from read */
bufcnt--;
bufp = buf;
return *bufp++;
}
/* 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;
}
int
serial_setbaudrate(rate)
int rate;
{
struct termios termios;
if (tcgetattr(desc, &termios))
error("tcgetattr failed: %s\n", safe_strerror(errno));
cfsetospeed(&termios, rate_to_code(rate));
cfsetispeed(&termios, rate_to_code(rate));
if (tcsetattr(desc, TCSANOW, &termios))
error("tcsetattr failed: %s\n", safe_strerror(errno));
return 1;
}
int
serial_write(str, len)
const char *str;
int len;
{
int cc;
while (len > 0)
{
cc = write(desc, str, len);
if (cc < 0)
return 0;
len -= cc;
str += cc;
}
return 1;
}
void
serial_close()
{
if (desc < 0)
return;
serial_restore(desc, &oldstate);
close(desc);
desc = -1;
}
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