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mc/slang/slutty.c
Norbert Warmuth f807b91600 Tue Apr 13 07:07:36 1999 Norbert Warmuth <nwarmuth@privat.circular.de> 
* slang/slutty.c (SLsys_getkey): handle EOF on stdin (return
SLANG_GETKEY_ERROR on EOF instead of returning garbage)

* slang/Makefile.in (clean): remove the symbolic link slang.h on the
distclean target and not on the clean target.


Tue Apr 13 07:14:10 1999  Norbert Warmuth  <nwarmuth@privat.circular.de>

* src/slint.c (getch): Quit MC when SLang_getkey returns an error. Looking
at the code that's only the case when we read EOF from stdin.

This fixes the problem where MC consumes a lot of cpu time while
reading EOF from stdin in a tight loop. This situation arises when the
terminal line/connection drops without MC being sent SIGHUP.


Tue Apr 13 06:07:05 1999  Norbert Warmuth  <nwarmuth@privat.circular.de>

* configure.in: Some AC_ARG_WITH macros haven't checked $withval, i.e.
--with-PACKAGE and --without-PACKAGE gave the same results.
1999-04-13 19:21:03 +00:00

542 lines
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/* slutty.c --- Unix Low level terminal (tty) functions for S-Lang */
/* Copyright (c) 1992, 1995 John E. Davis
* All rights reserved.
*
* You may distribute under the terms of either the GNU General Public
* License or the Perl Artistic License.
*/
#include "config.h"
#include <stdio.h>
#include <signal.h>
/* sequent support thanks to Kenneth Lorber <keni@oasys.dt.navy.mil> */
/* SYSV (SYSV ISC R3.2 v3.0) provided by iain.lea@erlm.siemens.de */
#if defined (_AIX) && !defined (_ALL_SOURCE)
# define _ALL_SOURCE /* so NBBY is defined in <sys/types.h> */
#endif
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#ifdef SYSV
# include <fcntl.h>
# ifndef CRAY
# include <sys/termio.h>
# include <sys/stream.h>
# include <sys/ptem.h>
# include <sys/tty.h>
# endif
#endif
#ifdef __BEOS__
/* Prototype for select */
# include <net/socket.h>
#endif
#include <sys/file.h>
#ifndef sun
# include <sys/ioctl.h>
#endif
#ifdef __QNX__
# include <sys/select.h>
#endif
#include <sys/stat.h>
#include <errno.h>
#if defined (_AIX) && !defined (FD_SET)
# include <sys/select.h> /* for FD_ISSET, FD_SET, FD_ZERO */
#endif
#ifndef O_RDWR
# include <fcntl.h>
#endif
#include "slang.h"
#include "_slang.h"
int SLang_TT_Read_FD = -1;
int SLang_TT_Baud_Rate;
#ifdef HAVE_TERMIOS_H
# if !defined(HAVE_TCGETATTR) || !defined(HAVE_TCSETATTR)
# undef HAVE_TERMIOS_H
# endif
#endif
#ifndef HAVE_TERMIOS_H
# if !defined(CBREAK) && defined(sun)
# ifndef BSD_COMP
# define BSD_COMP 1
# endif
# include <sys/ioctl.h>
# endif
typedef struct
{
struct tchars t;
struct ltchars lt;
struct sgttyb s;
}
TTY_Termio_Type;
#else
# include <termios.h>
typedef struct termios TTY_Termio_Type;
#endif
static TTY_Termio_Type Old_TTY;
#ifdef HAVE_TERMIOS_H
static struct
{
speed_t key;
int value;
} Baud_Rates[] =
{
{B0, 0},
{B50, 50},
{B75, 75},
{B110, 110},
{B134, 134},
{B150, 150},
{B200, 200},
{B300, 300},
{B600, 600},
{B1200, 1200},
{B1800, 1800},
{B2400, 2400},
{B4800, 4800},
{B9600, 9600},
{B19200, 19200},
{B38400, 38400}
#ifdef B57600
, {B57600, 57600}
#endif
#ifdef B115200
, {B115200, 115200}
#endif
#ifdef B230400
, {B230400, 230400}
#endif
};
#endif
#ifdef HAVE_TERMIOS_H
# define GET_TERMIOS(fd, x) tcgetattr(fd, x)
# define SET_TERMIOS(fd, x) tcsetattr(fd, TCSADRAIN, x)
#else
# ifdef TCGETS
# define GET_TERMIOS(fd, x) ioctl(fd, TCGETS, x)
# define SET_TERMIOS(fd, x) ioctl(fd, TCSETS, x)
# else
# define X(x,m) &(((TTY_Termio_Type *)(x))->m)
# define GET_TERMIOS(fd, x) \
((ioctl(fd, TIOCGETC, X(x,t)) || \
ioctl(fd, TIOCGLTC, X(x,lt)) || \
ioctl(fd, TIOCGETP, X(x,s))) ? -1 : 0)
# define SET_TERMIOS(fd, x) \
((ioctl(fd, TIOCSETC, X(x,t)) ||\
ioctl(fd, TIOCSLTC, X(x,lt)) || \
ioctl(fd, TIOCSETP, X(x,s))) ? -1 : 0)
# endif
#endif
static int TTY_Inited = 0;
static int TTY_Open = 0;
#ifdef ultrix /* Ultrix gets _POSIX_VDISABLE wrong! */
# define NULL_VALUE -1
#else
# ifdef _POSIX_VDISABLE
# define NULL_VALUE _POSIX_VDISABLE
# else
# define NULL_VALUE 255
# endif
#endif
static int
speed_t2baud_rate (speed_t s)
{
int i;
for (i = 0; i < sizeof (Baud_Rates)/sizeof (Baud_Rates[0]); i++)
if (Baud_Rates[i].key == s)
return (Baud_Rates[i].value);
return 0;
}
int SLang_init_tty (int abort_char, int no_flow_control, int opost)
{
TTY_Termio_Type newtty;
SLsig_block_signals ();
if (TTY_Inited)
{
SLsig_unblock_signals ();
return 0;
}
TTY_Open = 0;
if ((SLang_TT_Read_FD == -1)
|| (1 != isatty (SLang_TT_Read_FD)))
{
#if 0
#ifdef O_RDWR
# ifndef __BEOS__ /* I have been told that BEOS will HANG if passed /dev/tty */
if ((SLang_TT_Read_FD = open("/dev/tty", O_RDWR)) >= 0)
{
TTY_Open = 1;
}
# endif
#endif
#endif /* 0 */
if (TTY_Open == 0)
{
#if 0
/* In the Midnight Commander we bind stderr sometimes to a pipe. If we
use stderr for terminal input and call SLang_getkey while stderr is
bound to a pipe MC will hang completly in SLsys_input_pending.
NOTE: There's an independent fix for this problem in src/slint.c for
the case that the Midnight Commander is linked against a shared slang
library compiled from different sources.
*/
SLang_TT_Read_FD = fileno (stderr);
if (1 != isatty (SLang_TT_Read_FD))
#endif
{
SLang_TT_Read_FD = fileno (stdin);
if (1 != isatty (SLang_TT_Read_FD))
{
fprintf (stderr, "Failed to open terminal.");
return -1;
}
}
}
}
SLang_Abort_Char = abort_char;
/* Some systems may not permit signals to be blocked. As a result, the
* return code must be checked.
*/
while (-1 == GET_TERMIOS(SLang_TT_Read_FD, &Old_TTY))
{
if (errno != EINTR)
{
SLsig_unblock_signals ();
return -1;
}
}
while (-1 == GET_TERMIOS(SLang_TT_Read_FD, &newtty))
{
if (errno != EINTR)
{
SLsig_unblock_signals ();
return -1;
}
}
#ifndef HAVE_TERMIOS_H
newtty.s.sg_flags &= ~(ECHO);
newtty.s.sg_flags &= ~(CRMOD);
/* if (Flow_Control == 0) newtty.s.sg_flags &= ~IXON; */
newtty.t.t_eofc = 1;
if (abort_char == -1) SLang_Abort_Char = newtty.t.t_intrc;
newtty.t.t_intrc = SLang_Abort_Char; /* ^G */
newtty.t.t_quitc = 255;
newtty.lt.t_suspc = 255; /* to ignore ^Z */
newtty.lt.t_dsuspc = 255; /* to ignore ^Y */
newtty.lt.t_lnextc = 255;
newtty.s.sg_flags |= CBREAK; /* do I want cbreak or raw????? */
#else
/* get baud rate */
/* [not only QNX related !?!]
* ECHO(0x08) is a c_lflag bit, it means here PARMRK(0x08) in c_iflag!!!
*/
/*newtty.c_iflag &= ~(ECHO | INLCR | ICRNL);*/
newtty.c_iflag &= ~(INLCR | ICRNL);
#ifdef ISTRIP
/* newtty.c_iflag &= ~ISTRIP; */
#endif
if (opost == 0) newtty.c_oflag &= ~OPOST;
if (SLang_TT_Baud_Rate == 0)
{
/* Note: if this generates an compiler error, simply remove
the statement */
#ifdef HAVE_CFGETOSPEED
SLang_TT_Baud_Rate = cfgetospeed (&newtty);
#endif
SLang_TT_Baud_Rate = speed_t2baud_rate (SLang_TT_Baud_Rate);
}
if (no_flow_control) newtty.c_iflag &= ~IXON; else newtty.c_iflag |= IXON;
newtty.c_cc[VMIN] = 1;
newtty.c_cc[VTIME] = 0;
newtty.c_cc[VEOF] = 1;
newtty.c_lflag = ISIG | NOFLSH;
if (abort_char == -1) SLang_Abort_Char = newtty.c_cc[VINTR];
newtty.c_cc[VINTR] = SLang_Abort_Char; /* ^G */
newtty.c_cc[VQUIT] = NULL_VALUE;
newtty.c_cc[VSUSP] = NULL_VALUE; /* to ignore ^Z */
#ifdef VSWTCH
newtty.c_cc[VSWTCH] = NULL_VALUE; /* to ignore who knows what */
#endif
#endif /* NOT HAVE_TERMIOS_H */
while (-1 == SET_TERMIOS(SLang_TT_Read_FD, &newtty))
{
if (errno != EINTR)
{
SLsig_unblock_signals ();
return -1;
}
}
TTY_Inited = 1;
SLsig_unblock_signals ();
return 0;
}
void SLtty_set_suspend_state (int mode)
{
TTY_Termio_Type newtty;
SLsig_block_signals ();
if (TTY_Inited == 0)
{
SLsig_unblock_signals ();
return;
}
while ((-1 == GET_TERMIOS (SLang_TT_Read_FD, &newtty))
&& (errno == EINTR))
;
#ifndef HAVE_TERMIOS_H
if (mode == 0) newtty.lt.t_suspc = 255;
else newtty.lt.t_suspc = Old_TTY.lt.t_suspc;
#else
if (mode == 0) newtty.c_cc[VSUSP] = NULL_VALUE;
else newtty.c_cc[VSUSP] = Old_TTY.c_cc[VSUSP];
#endif
while ((-1 == SET_TERMIOS (SLang_TT_Read_FD, &newtty))
&& (errno == EINTR))
;
SLsig_unblock_signals ();
}
void SLang_reset_tty (void)
{
SLsig_block_signals ();
if (TTY_Inited == 0)
{
SLsig_unblock_signals ();
return;
}
while ((-1 == SET_TERMIOS(SLang_TT_Read_FD, &Old_TTY))
&& (errno == EINTR))
;
if (TTY_Open)
{
while ((-1 == close (SLang_TT_Read_FD))
&& (errno == EINTR))
;
TTY_Open = 0;
SLang_TT_Read_FD = -1;
}
TTY_Inited = 0;
SLsig_unblock_signals ();
}
static void default_sigint (int sig)
{
sig = errno; /* use parameter */
SLKeyBoard_Quit = 1;
if (SLang_Ignore_User_Abort == 0) SLang_Error = USER_BREAK;
SLsignal_intr (SIGINT, default_sigint);
errno = sig;
}
void SLang_set_abort_signal (void (*hand)(int))
{
int save_errno = errno;
if (hand == NULL) hand = default_sigint;
SLsignal_intr (SIGINT, hand);
errno = save_errno;
}
#ifndef FD_SET
#define FD_SET(fd, tthis) *(tthis) = 1 << (fd)
#define FD_ZERO(tthis) *(tthis) = 0
#define FD_ISSET(fd, tthis) (*(tthis) & (1 << fd))
typedef int fd_set;
#endif
static fd_set Read_FD_Set;
/* HACK: If > 0, use 1/10 seconds. If < 0, use 1/1000 seconds */
int SLsys_input_pending(int tsecs)
{
struct timeval wait;
long usecs, secs;
if (TTY_Inited == 0) return -1;
if (tsecs >= 0)
{
secs = tsecs / 10;
usecs = (tsecs % 10) * 100000;
}
else
{
tsecs = -tsecs;
secs = tsecs / 1000;
usecs = (tsecs % 1000) * 1000;
}
wait.tv_sec = secs;
wait.tv_usec = usecs;
FD_ZERO(&Read_FD_Set);
FD_SET(SLang_TT_Read_FD, &Read_FD_Set);
return select(SLang_TT_Read_FD + 1, &Read_FD_Set, NULL, NULL, &wait);
}
int (*SLang_getkey_intr_hook) (void);
static int handle_interrupt (void)
{
if (SLang_getkey_intr_hook != NULL)
{
int save_tty_fd = SLang_TT_Read_FD;
if (-1 == (*SLang_getkey_intr_hook) ())
return -1;
if (save_tty_fd != SLang_TT_Read_FD)
return -1;
}
return 0;
}
unsigned int SLsys_getkey (void)
{
unsigned char c;
unsigned int i;
if (TTY_Inited == 0)
{
int ic = fgetc (stdin);
if (ic == EOF) return SLANG_GETKEY_ERROR;
return (unsigned int) ic;
}
while (1)
{
int ret;
if (SLKeyBoard_Quit)
return SLang_Abort_Char;
if (0 == (ret = SLsys_input_pending (100)))
continue;
if (ret != -1)
break;
if (SLKeyBoard_Quit)
return SLang_Abort_Char;
if (errno == EINTR)
{
if (-1 == handle_interrupt ())
return SLANG_GETKEY_ERROR;
continue;
}
break; /* let read handle it */
}
while (-1 == (i = read(SLang_TT_Read_FD, (char *) &c, 1)))
{
if (errno == EINTR)
{
if (-1 == handle_interrupt ())
return SLANG_GETKEY_ERROR;
if (SLKeyBoard_Quit)
return SLang_Abort_Char;
continue;
}
#ifdef EAGAIN
if (errno == EAGAIN)
{
sleep (1);
continue;
}
#endif
#ifdef EWOULDBLOCK
if (errno == EWOULDBLOCK)
{
sleep (1);
continue;
}
#endif
#ifdef EIO
if (errno == EIO)
{
SLang_exit_error ("SLsys_getkey: EIO error.");
}
#endif
return SLANG_GETKEY_ERROR;
}
if (i == 0)
return SLANG_GETKEY_ERROR;
return((unsigned int) c);
}
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