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scsh-0.6/scsh/tty1.c

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/* To do:
* - Replace explicit 8/24 splits with macros.
* - We need to pass the control-chars vecs in as Scheme
* strings, and test the length before doing the memcpy.
*/
/*
* Scheme48/scsh terminal control interface.
* Routines that require custom C support.
* Copyright (c) 1995 by Brian D. Carlstrom
* Re-written by Olin.
*/
#include "sysdep.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h> /* ctermid decl */
#include <termios.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include "scheme48.h"
#ifdef HAVE_STROPTS_H
#include <stropts.h>
#endif
#ifdef HAVE_PTY_H
#include <pty.h> /* openpty() on Tru64, Linux */
#endif
#ifdef HAVE_LIBUTIL_H
#include <libutil.h> /* openpty() on FreeBSD */
#endif
#ifdef HAVE_UTIL_H
#include <util.h> /* openpty() on NetBSD */
#endif
#ifndef countof
# define countof(x) (sizeof (x) / sizeof (*(x)))
#endif
#define INTERRUPTIBLE_CLOSE
int
retry_close (int filedes)
{
#ifdef INTERRUPTIBLE_CLOSE
int did_retry = 0;
int rtnval;
while ((rtnval = close (filedes)) == -1
&& (errno == EINTR))
did_retry = 1;
/* If close is interrupted SunOS 4.1 may or may not have closed the
file descriptor. If it did the second close will fail with
errno = EBADF. That means we have succeeded. */
if (rtnval == -1 && did_retry && errno == EBADF)
return 0;
return rtnval;
#else
return close (filedes);
#endif
}
/* This #include is for the #ifdef'd code in open_ctty() below, and
** is therefor ifdef'd identically.
*/
#if defined(TIOCSCTTY) && !defined(CIBAUD)
#include <sys/ioctl.h>
#endif
#include "tty1.h" /* Make sure the .h interface agrees with the code. */
/*****************************************************************************/
s48_value scheme_tcgetattr(s48_value sch_fd, s48_value sch_control_chars)
/* int *iflag,
int *oflag,
int *cflag,
int *lflag,
int *ispeed, int *ospeed)*/
{
struct termios t;
int fd = s48_extract_fixnum(sch_fd);
if (isatty(fd) == 0) {
fprintf(stderr, "%d is not a tty\n", fd);
return S48_FALSE;
}
int result = tcgetattr(s48_extract_fixnum (sch_fd), &t);
int i;
s48_value sch_iflag = S48_UNSPECIFIC;
s48_value sch_oflag = S48_UNSPECIFIC;
s48_value sch_cflag = S48_UNSPECIFIC;
s48_value sch_lflag = S48_UNSPECIFIC;
s48_value sch_ispeed = S48_UNSPECIFIC;
s48_value sch_ospeed = S48_UNSPECIFIC;
s48_value sch_retval = S48_UNSPECIFIC;
S48_DECLARE_GC_PROTECT(6);
S48_GC_PROTECT_6(sch_iflag, sch_oflag, sch_cflag, sch_lflag, sch_ispeed,
sch_ospeed);
if (result == -1) {
S48_GC_UNPROTECT();
s48_raise_os_error_2 (errno, sch_fd, sch_control_chars);
}
for (i = 0; i < NCCS; i++)
S48_STRING_SET(sch_control_chars, i, t.c_cc[i]);
{
sch_iflag = s48_enter_integer(t.c_iflag);
sch_oflag = s48_enter_integer(t.c_oflag);
sch_cflag = s48_enter_integer(t.c_cflag);
sch_lflag = s48_enter_integer(t.c_lflag);
sch_ispeed = s48_enter_integer(cfgetispeed(&t));
sch_ospeed = s48_enter_integer(cfgetospeed(&t));
sch_retval = s48_list_6 (sch_iflag, sch_oflag, sch_cflag, sch_lflag,
sch_ispeed, sch_ospeed);
S48_GC_UNPROTECT();
return sch_retval;
}
}
/* The Scheme caller of this is commented out...*/
int scheme_tcgetattrB(int fd, char *control_chars, s48_value scmvec)
{
struct termios t;
int result = tcgetattr(fd, &t);
S48_DECLARE_GC_PROTECT(1);
S48_GC_PROTECT_1(scmvec);
/* JMG int *ivec = ADDRESS_AFTER_HEADER(scmvec, int);*/
if (result != -1) {
memcpy(control_chars, t.c_cc, NCCS);
S48_VECTOR_SET(scmvec, 0, s48_enter_integer(t.c_iflag));
S48_VECTOR_SET(scmvec, 1, s48_enter_integer(t.c_oflag));
S48_VECTOR_SET(scmvec, 2, s48_enter_integer(t.c_cflag));
S48_VECTOR_SET(scmvec, 3, s48_enter_integer(t.c_lflag));
S48_VECTOR_SET(scmvec, 4, s48_enter_fixnum(cfgetispeed(&t)));
S48_VECTOR_SET(scmvec, 5, s48_enter_fixnum(cfgetospeed(&t)));
}
S48_GC_UNPROTECT();
return result;
}
/*****************************************************************************/
s48_value scheme_tcsetattr(s48_value sch_fd, s48_value sch_option,
s48_value sch_control_chars,
s48_value sch_iflag,
s48_value sch_oflag,
s48_value sch_cflag,
s48_value sch_lflag,
s48_value sch_ispeed, s48_value sch_ospeed,
s48_value sch_min, s48_value sch_time)
{
struct termios t;
memcpy(t.c_cc, s48_extract_string (sch_control_chars), NCCS);
/* This first clause of this conditional test will hopefully
** resolve the branch at compile time. However, since VMIN/VEOF
** and VTIME/VEOL are allowed by POSIX to colllide, we have to check.
** If they do collide, we set EOF & EOL in canonical mode, and MIN & TIME
** in raw mode. Ah, Unix.
*/
t.c_iflag = s48_extract_integer (sch_iflag);
t.c_oflag = s48_extract_integer (sch_oflag);
t.c_cflag = s48_extract_integer (sch_cflag);
t.c_lflag = s48_extract_integer (sch_lflag);
if( (VMIN != VEOF && VTIME != VEOL) || !(t.c_lflag & ICANON) ) {
t.c_cc[VMIN] = s48_extract_fixnum (sch_min);
t.c_cc[VTIME] = s48_extract_integer (sch_time);
}
cfsetispeed(&t, s48_extract_integer (sch_ispeed));
cfsetospeed(&t, s48_extract_integer (sch_ospeed));
if (tcsetattr(s48_extract_fixnum (sch_fd), s48_extract_integer (sch_option),
&t)
== -1)
s48_raise_os_error_1 (errno, sch_fd);
return S48_UNSPECIFIC;
}
s48_value sch_tcsendbreak (s48_value sch_fd, s48_value sch_duration)
{
if (tcsendbreak (s48_extract_fixnum (sch_fd),
s48_extract_integer (sch_duration)) == -1)
s48_raise_os_error_2 (errno, sch_fd, sch_duration);
return S48_UNSPECIFIC;
}
s48_value sch_tcdrain (s48_value sch_fd)
{
if (tcdrain (s48_extract_fixnum (sch_fd)) == -1)
s48_raise_os_error_1 (errno, sch_fd);
return S48_UNSPECIFIC;
}
s48_value sch_tcflush (s48_value sch_fd, s48_value sch_action)
{
if (tcflush (s48_extract_fixnum (sch_fd),
s48_extract_fixnum (sch_action)) == -1)
s48_raise_os_error_2 (errno, sch_fd, sch_action);
return S48_UNSPECIFIC;
}
s48_value sch_tcflow (s48_value sch_fd, s48_value sch_action)
{
if (tcflow (s48_extract_fixnum (sch_fd),
s48_extract_fixnum (sch_action)) == -1)
s48_raise_os_error_2 (errno, sch_fd, sch_action);
return S48_UNSPECIFIC;
}
s48_value sch_tcsetpgrp (s48_value sch_fd, s48_value sch_pid)
{
if (tcsetpgrp (s48_extract_fixnum (sch_fd),
s48_extract_fixnum (sch_pid)) == -1)
s48_raise_os_error_2 (errno, sch_fd, sch_pid);
return S48_UNSPECIFIC;
}
s48_value sch_tcgetpgrp (s48_value sch_fd)
{
int ret = tcgetpgrp (s48_extract_fixnum (sch_fd));
if (ret == -1)
s48_raise_os_error_1 (errno, sch_fd);
return s48_enter_integer (ret);
}
/*****************************************************************************/
s48_value open_ctty(s48_value sch_ttyname, s48_value sch_flags)
{
int fd = open(s48_extract_string (sch_ttyname),
s48_extract_integer (sch_flags));
#if defined(TIOCSCTTY) && !defined(CIBAUD) && !defined(__hpux)
/* 4.3+BSD way to acquire control tty. !CIBAUD rules out SunOS.
** This code stolen from Steven's *Advanced Prog. in the Unix Env.*
*/
if( (fd >= 0) && (ioctl(fd, TIOCSCTTY, (char *) 0) < 0) ) {
int e = errno;
close(fd);
s48_raise_os_error_2 (e, sch_ttyname, sch_flags);
}
#endif
if (fd == -1)
s48_raise_os_error_2 (errno, sch_ttyname, sch_flags);
return s48_enter_fixnum (fd);
}
s48_value make_ctty(s48_value sch_fd)
{
int fd = s48_extract_fixnum (sch_fd);
#if defined(TIOCSCTTY) && !defined(CIBAUD) && !defined(__hpux)
/* 4.3+BSD way to acquire control tty. !CIBAUD rules out SunOS.
** This code stolen from Steven's *Advanced Prog. in the Unix Env.*
*/
if( (fd >= 0) && (ioctl(fd, TIOCSCTTY, (char *) 0) < 0) ) {
s48_raise_os_error_1 (errno, sch_fd);
}
#endif
return S48_UNSPECIFIC;
}
s48_value pty2tty(s48_value sch_fd)
{
int fd = s48_extract_fixnum(sch_fd);
#if defined (HAVE_ISASTREAM) && defined (I_PUSH)
if (isastream (fd))
{
# if defined (I_FIND)
# define stream_module_pushed(fd, module) (ioctl (fd, I_FIND, module) == 1)
# else
# define stream_module_pushed(fd, module) 0
# endif
if ((! stream_module_pushed (fd, "ptem")) &&
(ioctl (fd, I_PUSH, "ptem") < 0))
s48_raise_os_error_1 (errno, sch_fd);
if ((! stream_module_pushed (fd, "ldterm")) &&
(ioctl (fd, I_PUSH, "ldterm") < 0))
s48_raise_os_error_1 (errno, sch_fd);
if ((! stream_module_pushed (fd, "ttcompat")) &&
(ioctl (fd, I_PUSH, "ttcompat") < 0))
s48_raise_os_error_1 (errno, sch_fd);
}
#endif /* defined (HAVE_ISASTREAM) && defined (I_PUSH) */
return S48_UNSPECIFIC;
}
s48_value sch_isatty (s48_value sch_fd)
{
return ((isatty (s48_extract_fixnum (sch_fd))) ? S48_TRUE : S48_FALSE);
}
s48_value sch_ttyname (s48_value sch_fd)
{
char* ret = ttyname (s48_extract_fixnum (sch_fd));
if (ret == NULL)
s48_raise_os_error_1 (errno, sch_fd);
return s48_enter_string (ret);
}
s48_value scm_ctermid()
{
char* ret = ctermid(0);
if (ret == NULL)
s48_raise_os_error (errno);
return s48_enter_string (ret);
}
static int allocate_master (const char**, const char **);
static const char* allocate_slave_name(int, const char*);
#define BLOCK_SIGNAL(sig) do \
{ \
sigset_t sig_mask; \
sigemptyset (&sig_mask); \
sigaddset (&sig_mask, sig); \
sigprocmask (SIG_BLOCK, &sig_mask, NULL); \
} while (0)
#define UNBLOCK_SIGNAL(sig) do \
{ \
sigset_t sig_mask; \
sigemptyset (&sig_mask); \
sigaddset (&sig_mask, sig); \
sigprocmask (SIG_UNBLOCK, &sig_mask, NULL); \
} while (0)
/* Open an available pty, returning a file descriptor.
Return -1 on failure. */
allocate_pty (void)
{
/* Unix98 standardized grantpt, unlockpt, and ptsname, but not the
functions required to open a master pty in the first place :-(
Modern Unix systems all seems to have convenience methods to open
a master pty fd in one function call, but there is little
agreement on how to do it.
allocate_pty() tries all the different known easy ways of opening
a pty. In case of failure, we resort to the old BSD-style pty
grovelling code in allocate_pty_the_old_fashioned_way(). */
int master_fd = -1;
const char *slave_name = NULL;
const char* clone = NULL;
s48_value scm_slave_name = S48_UNSPECIFIC;
master_fd = allocate_master(&slave_name, &clone);
if (master_fd == -1)
return S48_FALSE;
if (slave_name == NULL){
slave_name = allocate_slave_name(master_fd, clone);
if (slave_name == NULL){
retry_close (master_fd);
return S48_FALSE;
}
}
scm_slave_name = s48_enter_string((char *) slave_name);
#ifdef TIOCPKT
/* In some systems (Linux through 2.0.0, at least), packet mode doesn't
get cleared when a pty is closed, so we need to clear it here.
Linux pre2.0.13 contained an attempted fix for this (from Ted Ts'o,
tytso@mit.edu), but apparently it messed up rlogind and telnetd, so he
removed the fix in pre2.0.14. - dkindred@cs.cmu.edu
*/
int off = 0;
ioctl (master_fd, TIOCPKT, (char *)&off);
#endif /* TIOCPKT */
/* We jump through some hoops to frob the pty.
It's not obvious that checking the return code here is useful. */
/* "The grantpt() function will fail if it is unable to successfully
invoke the setuid root program. It may also fail if the
application has installed a signal handler to catch SIGCHLD
signals." */
#if defined (HAVE_GRANTPT) || defined (HAVE_UNLOCKPT)
BLOCK_SIGNAL (SIGCHLD);
#if defined (HAVE_GRANTPT)
grantpt (master_fd);
#endif /* HAVE_GRANTPT */
#if defined (HAVE_UNLOCKPT)
unlockpt (master_fd);
#endif
UNBLOCK_SIGNAL (SIGCHLD);
#endif /* HAVE_GRANTPT || HAVE_UNLOCKPT */
fcntl(master_fd, F_SETFL, O_NONBLOCK);
return s48_cons(s48_enter_fixnum(master_fd), scm_slave_name);
}
static int
allocate_master(const char ** slave_name, const char** clone){
int master_fd = -1;
static const char * const clones[] =
/* Different pty master clone devices */
{
"/dev/ptmx", /* Various systems */
"/dev/ptm/clone", /* HPUX */
"/dev/ptc", /* AIX */
"/dev/ptmx_bsd" /* Tru64 */
};
#ifdef HAVE_GETPT /* glibc */
master_fd = getpt ();
if (master_fd >= 0)
return master_fd;
#endif /* HAVE_GETPT */
#if defined(HAVE_OPENPTY) /* BSD, Tru64, glibc */
{
int slave_fd = -1;
int rc;
BLOCK_SIGNAL (SIGCHLD);
rc = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
UNBLOCK_SIGNAL (SIGCHLD);
if (rc == 0)
{
*slave_name = ttyname (slave_fd);
retry_close (slave_fd);
return master_fd;
}
else
{
if (master_fd >= 0)
retry_close (master_fd);
if (slave_fd >= 0)
retry_close (slave_fd);
}
}
#endif /* HAVE_OPENPTY */
#if defined(HAVE__GETPTY) && defined (O_NDELAY) /* SGI */
master_fd = -1;
BLOCK_SIGNAL (SIGCHLD);
*slave_name = _getpty (&master_fd, O_RDWR | O_NDELAY, 0600, 0);
UNBLOCK_SIGNAL (SIGCHLD);
if (master_fd >= 0 && *slave_name != NULL)
return master_fd;
#endif /* HAVE__GETPTY */
/* Master clone devices are available on most systems */
{
int i;
for (i = 0; i < countof (clones); i++)
{
*clone = clones[i];
master_fd = open ((char *) *clone, // TODO: retry open
O_RDWR | O_NONBLOCK, 0);
if (master_fd >= 0)
return master_fd;
}
*clone = NULL;
}
return -1;
}
static const char*
allocate_slave_name(int master_fd, const char* clone){
char * slave_name;
#if defined (HAVE_PTSNAME)
slave_name = ptsname (master_fd);
if (slave_name)
return slave_name;
#endif
/* kludge for AIX */
if (clone
&& !strcmp (clone, "/dev/ptc")
&& (slave_name = ttyname (master_fd)) != NULL)
return slave_name;
return NULL;
}
void s48_init_tty(void)
{
S48_EXPORT_FUNCTION(scheme_tcgetattr);
S48_EXPORT_FUNCTION(scheme_tcsetattr);
S48_EXPORT_FUNCTION(sch_tcsendbreak);
S48_EXPORT_FUNCTION(sch_tcdrain);
S48_EXPORT_FUNCTION(sch_tcflush);
S48_EXPORT_FUNCTION(sch_tcflow);
S48_EXPORT_FUNCTION(sch_tcsetpgrp);
S48_EXPORT_FUNCTION(sch_tcgetpgrp);
S48_EXPORT_FUNCTION(open_ctty);
S48_EXPORT_FUNCTION(make_ctty);
S48_EXPORT_FUNCTION(pty2tty);
S48_EXPORT_FUNCTION(sch_isatty);
S48_EXPORT_FUNCTION(sch_ttyname);
S48_EXPORT_FUNCTION(scm_ctermid);
S48_EXPORT_FUNCTION(allocate_pty);
}
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