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v9.2.0491
vim-mirror/src/pty.c
T
Hirohito Higashi 3c79e33aeb patch 9.2.0298: Some internal variables are not modified 
Problem:  Some internal variables are not modified
Solution: Add const qualifier to static table data
          (Hirohito Higashi).

Several static arrays that are never modified at runtime were missing the
const qualifier. Add const to move them from .data to .rodata section.

closes: #19901

Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
2026-04-04 09:09:13 +00:00

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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* The stuff in this file mostly comes from the "screen" program.
* Included with permission from Juergen Weigert.
* Copied from "pty.c". "putenv.c" was used for putenv() in misc2.c.
*
* It has been modified to work better with Vim.
* The parts that are not used in Vim have been deleted.
* See the "screen" sources for the complete stuff.
*
* This specific version is distributed under the Vim license (attribution by
* Juergen Weigert), the GPL applies to the original version, see the
* copyright notice below.
*/
// Copyright (c) 1993
// Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
// Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
// Copyright (c) 1987 Oliver Laumann
//
// 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, 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 (see the file COPYING); if not, write to the
// Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
#include "vim.h"
#if defined(FEAT_GUI) || defined(FEAT_JOB_CHANNEL)
#include <signal.h>
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#if HAVE_STROPTS_H
# include <sys/types.h>
# ifdef sinix
# define buf_T __system_buf_t__
# endif
# include <stropts.h>
# ifdef sinix
# undef buf_T
# endif
# ifdef SUN_SYSTEM
# include <sys/conf.h>
# if defined(HAVE_SYS_PTMS_H) && defined(HAVE_SVR4_PTYS)
# include <sys/ptms.h>
# endif
# endif
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_TERMIO_H
# include <termio.h>
#else
# ifdef HAVE_TERMIOS_H
# include <termios.h>
# endif
#endif
#if HAVE_SYS_STREAM_H
# include <sys/stream.h>
#endif
#if HAVE_SYS_PTEM_H
# include <sys/ptem.h>
#endif
#if !defined(SUN_SYSTEM) && !defined(VMS)
# include <sys/ioctl.h>
#endif
#if defined(SUN_SYSTEM) && defined(LOCKPTY) && !defined(TIOCEXCL)
# include <sys/ttold.h>
#endif
#ifdef ISC
# include <sys/tty.h>
# include <sys/sioctl.h>
# include <sys/pty.h>
#endif
#ifdef sgi
# include <sys/sysmacros.h>
#endif
#if defined(_INCLUDE_HPUX_SOURCE) && !defined(hpux)
# define hpux
#endif
/*
* if no PTYRANGE[01] is in the config file, we pick a default
*/
#ifndef PTYRANGE0
# define PTYRANGE0 "qprs"
#endif
#ifndef PTYRANGE1
# define PTYRANGE1 "0123456789abcdef"
#endif
// SVR4 pseudo ttys don't seem to work with SCO-5
#ifdef M_UNIX
# undef HAVE_SVR4_PTYS
#endif
/*
* Open all ptys with O_NOCTTY, just to be on the safe side.
*/
#ifndef O_NOCTTY
# define O_NOCTTY 0
#endif
#if defined(HAVE_SVR4_PTYS) || defined(HAVE_POSIX_OPENPT)
// These should be in stdlib.h, but it depends on _XOPEN_SOURCE.
char *ptsname(int);
int unlockpt(int);
int grantpt(int);
int posix_openpt(int flags);
#endif
static void
initmaster(int f UNUSED)
{
#ifndef VMS
# ifdef POSIX
tcflush(f, TCIOFLUSH);
# else
# ifdef TIOCFLUSH
(void)ioctl(f, TIOCFLUSH, (char *) 0);
# endif
# endif
# ifdef LOCKPTY
(void)ioctl(f, TIOCEXCL, (char *) 0);
# endif
#endif
}
/*
* This causes a hang on some systems, but is required for a properly working
* pty on others. Needs to be tuned...
*/
int
setup_slavepty(int fd)
{
if (fd < 0)
return 0;
#if defined(I_PUSH) && defined(HAVE_SVR4_PTYS) && !defined(sgi) \
&& !defined(linux) && !defined(__osf__) && !defined(M_UNIX)
# if defined(HAVE_SYS_PTEM_H) || defined(hpux)
if (ioctl(fd, I_PUSH, "ptem") != 0)
return -1;
# endif
if (ioctl(fd, I_PUSH, "ldterm") != 0)
return -1;
# ifdef SUN_SYSTEM
if (ioctl(fd, I_PUSH, "ttcompat") != 0)
return -1;
# endif
#endif
return 0;
}
#if defined(HAVE_POSIX_OPENPT) && !defined(PTY_DONE)
# define PTY_DONE
int
mch_openpty(char **ttyn)
{
int f;
char *m;
sighandler_T sigcld;
static char TtyName[32]; // used for opening a new pty-pair
if ((f = posix_openpt(O_RDWR | O_NOCTTY | O_EXTRA)) == -1)
return -1;
// SIGCHLD set to SIG_DFL for grantpt() because it fork()s and
// exec()s pt_chmod
sigcld = mch_signal(SIGCHLD, SIG_DFL);
if ((m = ptsname(f)) == NULL || grantpt(f) || unlockpt(f))
{
mch_signal(SIGCHLD, sigcld);
close(f);
return -1;
}
mch_signal(SIGCHLD, sigcld);
vim_strncpy((char_u *)TtyName, (char_u *)m, sizeof(TtyName) - 1);
initmaster(f);
*ttyn = TtyName;
return f;
}
#endif
#if defined(OSX) && !defined(PTY_DONE)
# define PTY_DONE
int
mch_openpty(char **ttyn)
{
int f;
static char TtyName[32];
if ((f = open_controlling_pty(TtyName)) < 0)
return -1;
initmaster(f);
*ttyn = TtyName;
return f;
}
#endif
#if (defined(sequent) || defined(_SEQUENT_)) && defined(HAVE_GETPSEUDOTTY) \
&& !defined(PTY_DONE)
# define PTY_DONE
int
mch_openpty(char **ttyn)
{
char *m, *s;
int f;
// used for opening a new pty-pair:
static char PtyName[32];
static char TtyName[32];
if ((f = getpseudotty(&s, &m)) < 0)
return -1;
# ifdef _SEQUENT_
fvhangup(s);
# endif
vim_strncpy((char_u *)PtyName, (char_u *)m, sizeof(PtyName) - 1);
vim_strncpy((char_u *)TtyName, (char_u *)s, sizeof(TtyName) - 1);
initmaster(f);
*ttyn = TtyName;
return f;
}
#endif
#if defined(MIPS) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
# define PTY_DONE
int
mch_openpty(char **ttyn)
{
int f;
stat_T buf;
// used for opening a new pty-pair:
static char TtyName[32];
if ((f = open("/dev/ptc", O_RDWR | O_NOCTTY | O_NONBLOCK | O_EXTRA, 0)) < 0)
return -1;
if (mch_fstat(f, &buf) < 0)
{
close(f);
return -1;
}
sprintf(TtyName, "/dev/ttyq%d", minor(buf.st_rdev));
initmaster(f);
*ttyn = TtyName;
return f;
}
#endif
#if defined(HAVE_SVR4_PTYS) && !defined(PTY_DONE) && !defined(hpux) \
&& !(defined(MACOS_X) && !defined(MAC_OS_X_VERSION_10_6))
// NOTE: Even though HPUX can have /dev/ptmx, the code below doesn't work!
// Same for Mac OS X Leopard (10.5).
# define PTY_DONE
int
mch_openpty(char **ttyn)
{
int f;
char *m;
sighandler_T sigcld;
// used for opening a new pty-pair:
static char TtyName[32];
if ((f = open("/dev/ptmx", O_RDWR | O_NOCTTY | O_EXTRA, 0)) == -1)
return -1;
/*
* SIGCHLD set to SIG_DFL for grantpt() because it fork()s and
* exec()s pt_chmod
*/
sigcld = mch_signal(SIGCHLD, SIG_DFL);
if ((m = ptsname(f)) == NULL || grantpt(f) || unlockpt(f))
{
mch_signal(SIGCHLD, sigcld);
close(f);
return -1;
}
mch_signal(SIGCHLD, sigcld);
vim_strncpy((char_u *)TtyName, (char_u *)m, sizeof(TtyName) - 1);
initmaster(f);
*ttyn = TtyName;
return f;
}
#endif
#if defined(_AIX) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
# define PTY_DONE
# ifdef _IBMR2
static int aixhack = -1;
# endif
int
mch_openpty(char **ttyn)
{
int f;
// used for opening a new pty-pair:
static char TtyName[32];
// a dumb looking loop replaced by mycrofts code:
if ((f = open("/dev/ptc", O_RDWR | O_NOCTTY | O_EXTRA)) < 0)
return -1;
vim_strncpy((char_u *)TtyName, (char_u *)ttyname(f), sizeof(TtyName) - 1);
if (geteuid() != ROOT_UID && mch_access(TtyName, R_OK | W_OK))
{
close(f);
return -1;
}
initmaster(f);
# ifdef _IBMR2
if (aixhack >= 0)
close(aixhack);
if ((aixhack = open(TtyName, O_RDWR | O_NOCTTY | O_EXTRA, 0)) < 0)
{
close(f);
return -1;
}
# endif
*ttyn = TtyName;
return f;
}
#endif
#ifndef PTY_DONE
# ifdef hpux
static const char PtyProto[] = "/dev/ptym/ptyXY";
static const char TtyProto[] = "/dev/pty/ttyXY";
# else
# ifdef __HAIKU__
static const char PtyProto[] = "/dev/pt/XY";
static const char TtyProto[] = "/dev/tt/XY";
# else
static const char PtyProto[] = "/dev/ptyXY";
static const char TtyProto[] = "/dev/ttyXY";
# endif
# endif
int
mch_openpty(char **ttyn)
{
char *p, *q, *l, *d;
int f;
// used for opening a new pty-pair:
static char PtyName[32];
static char TtyName[32];
vim_strncpy((char_u *)PtyName, (char_u *)PtyProto, sizeof(PtyName) - 1);
vim_strncpy((char_u *)TtyName, (char_u *)TtyProto, sizeof(TtyName) - 1);
for (p = PtyName; *p != 'X'; p++)
;
for (q = TtyName; *q != 'X'; q++)
;
for (l = PTYRANGE0; (*p = *l) != '\0'; l++)
{
for (d = PTYRANGE1; (p[1] = *d) != '\0'; d++)
{
if ((f = open(PtyName, O_RDWR | O_NOCTTY | O_EXTRA, 0)) == -1)
continue;
q[0] = *l;
q[1] = *d;
if (geteuid() != ROOT_UID && mch_access(TtyName, R_OK | W_OK))
{
close(f);
continue;
}
# if defined(SUN_SYSTEM) && defined(TIOCGPGRP) && !defined(SUNOS3)
// Hack to ensure that the slave side of the pty is
// unused. May not work in anything other than SunOS4.1
{
int pgrp;
// tcgetpgrp does not work (uses TIOCGETPGRP)!
if (ioctl(f, TIOCGPGRP, (char *)&pgrp) != -1 || errno != EIO)
{
close(f);
continue;
}
}
# endif
initmaster(f);
*ttyn = TtyName;
return f;
}
}
return -1;
}
#endif
/*
* Call isatty(fd), except for SunOS where it's done differently.
*/
int
mch_isatty(int fd)
{
#if defined(I_STR) && defined(HAVE_SYS_PTMS_H) && defined(HAVE_SVR4_PTYS) \
&& defined(SUN_SYSTEM)
// On SunOS, isatty() for /dev/ptmx returns false or sometimes can hang up
// in the inner ioctl(), and therefore first determine whether "fd" is a
// master device.
struct strioctl istr;
istr.ic_cmd = ISPTM;
istr.ic_timout = 0;
istr.ic_dp = NULL;
istr.ic_len = 0;
if (ioctl(fd, I_STR, &istr) == 0)
// Trick: return 2 in order to advice the caller that "fd" is a master
// device. cf. src/os_unix.c:get_tty_fd()
return 2;
#endif
return isatty(fd);
}
#endif // FEAT_GUI || FEAT_JOB_CHANNEL
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