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-rw-r--r--examples/rlfe/pty.c388
1 files changed, 388 insertions, 0 deletions
diff --git a/examples/rlfe/pty.c b/examples/rlfe/pty.c
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+/* Copyright (c) 1993-2002
+ * 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 "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <signal.h>
+
+#include <unistd.h>
+
+#include "screen.h"
+
+#ifndef sun
+# include <sys/ioctl.h>
+#endif
+
+/* for solaris 2.1, Unixware (SVR4.2) and possibly others */
+#if defined (HAVE_SVR4_PTYS) && defined (HAVE_SYS_STROPTS_H)
+# include <sys/stropts.h>
+#endif
+
+#if defined(sun) && 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 /* sgi */
+
+#include "extern.h"
+
+/*
+ * if no PTYRANGE[01] is in the config file, we pick a default
+ */
+#ifndef PTYRANGE0
+# define PTYRANGE0 "qpr"
+#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
+
+extern int eff_uid;
+
+/* used for opening a new pty-pair: */
+static char PtyName[32], TtyName[32];
+
+#if !(defined(sequent) || defined(_SEQUENT_) || defined(HAVE_SVR4_PTYS))
+# ifdef hpux
+static char PtyProto[] = "/dev/ptym/ptyXY";
+static char TtyProto[] = "/dev/pty/ttyXY";
+# else
+# ifdef M_UNIX
+static char PtyProto[] = "/dev/ptypXY";
+static char TtyProto[] = "/dev/ttypXY";
+# else
+static char PtyProto[] = "/dev/ptyXY";
+static char TtyProto[] = "/dev/ttyXY";
+# endif
+# endif /* hpux */
+#endif
+
+static void initmaster __P((int));
+
+#if defined(sun)
+/* sun's utmp_update program opens the salve side, thus corrupting
+ */
+int pty_preopen = 1;
+#else
+int pty_preopen = 0;
+#endif
+
+/*
+ * Open all ptys with O_NOCTTY, just to be on the safe side
+ * (RISCos mips breaks otherwise)
+ */
+#ifndef O_NOCTTY
+# define O_NOCTTY 0
+#endif
+
+/***************************************************************/
+
+static void
+initmaster(f)
+int f;
+{
+#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
+}
+
+void
+InitPTY(f)
+int f;
+{
+ if (f < 0)
+ return;
+#if defined(I_PUSH) && defined(HAVE_SVR4_PTYS) && !defined(sgi) && !defined(linux) && !defined(__osf__) && !defined(M_UNIX)
+ if (ioctl(f, I_PUSH, "ptem"))
+ Panic(errno, "InitPTY: cannot I_PUSH ptem");
+ if (ioctl(f, I_PUSH, "ldterm"))
+ Panic(errno, "InitPTY: cannot I_PUSH ldterm");
+# ifdef sun
+ if (ioctl(f, I_PUSH, "ttcompat"))
+ Panic(errno, "InitPTY: cannot I_PUSH ttcompat");
+# endif
+#endif
+}
+
+/***************************************************************/
+
+#if defined(OSX) && !defined(PTY_DONE)
+#define PTY_DONE
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ register int f;
+ if ((f = open_controlling_pty(TtyName)) < 0)
+ return -1;
+ initmaster(f);
+ *ttyn = TtyName;
+ return f;
+}
+#endif
+
+/***************************************************************/
+
+#if (defined(sequent) || defined(_SEQUENT_)) && !defined(PTY_DONE)
+#define PTY_DONE
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ char *m, *s;
+ register int f;
+
+ if ((f = getpseudotty(&s, &m)) < 0)
+ return -1;
+#ifdef _SEQUENT_
+ fvhangup(s);
+#endif
+ strncpy(PtyName, m, sizeof(PtyName));
+ strncpy(TtyName, s, sizeof(TtyName));
+ initmaster(f);
+ *ttyn = TtyName;
+ return f;
+}
+#endif
+
+/***************************************************************/
+
+#if defined(__sgi) && !defined(PTY_DONE)
+#define PTY_DONE
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ int f;
+ char *name, *_getpty();
+ sigret_t (*sigcld)__P(SIGPROTOARG);
+
+ /*
+ * SIGCHLD set to SIG_DFL for _getpty() because it may fork() and
+ * exec() /usr/adm/mkpts
+ */
+ sigcld = signal(SIGCHLD, SIG_DFL);
+ name = _getpty(&f, O_RDWR | O_NONBLOCK, 0600, 0);
+ signal(SIGCHLD, sigcld);
+
+ if (name == 0)
+ return -1;
+ initmaster(f);
+ *ttyn = name;
+ return f;
+}
+#endif
+
+/***************************************************************/
+
+#if defined(MIPS) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
+#define PTY_DONE
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ register int f;
+ struct stat buf;
+
+ strcpy(PtyName, "/dev/ptc");
+ if ((f = open(PtyName, O_RDWR | O_NOCTTY | O_NONBLOCK)) < 0)
+ return -1;
+ if (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)
+#define PTY_DONE
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ register int f;
+ char *m, *ptsname();
+ int unlockpt __P((int)), grantpt __P((int));
+#if defined(HAVE_GETPT) && defined(linux)
+ int getpt __P((void));
+#endif
+ sigret_t (*sigcld)__P(SIGPROTOARG);
+
+ strcpy(PtyName, "/dev/ptmx");
+#if defined(HAVE_GETPT) && defined(linux)
+ if ((f = getpt()) == -1)
+#else
+ if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1)
+#endif
+ return -1;
+
+ /*
+ * SIGCHLD set to SIG_DFL for grantpt() because it fork()s and
+ * exec()s pt_chmod
+ */
+ sigcld = signal(SIGCHLD, SIG_DFL);
+ if ((m = ptsname(f)) == NULL || grantpt(f) || unlockpt(f))
+ {
+ signal(SIGCHLD, sigcld);
+ close(f);
+ return -1;
+ }
+ signal(SIGCHLD, sigcld);
+ strncpy(TtyName, m, sizeof(TtyName));
+ initmaster(f);
+ *ttyn = TtyName;
+ return f;
+}
+#endif
+
+/***************************************************************/
+
+#if defined(_AIX) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
+#define PTY_DONE
+
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ register int f;
+
+ /* a dumb looking loop replaced by mycrofts code: */
+ strcpy (PtyName, "/dev/ptc");
+ if ((f = open (PtyName, O_RDWR | O_NOCTTY)) < 0)
+ return -1;
+ strncpy(TtyName, ttyname(f), sizeof(TtyName));
+ if (eff_uid && access(TtyName, R_OK | W_OK))
+ {
+ close(f);
+ return -1;
+ }
+ initmaster(f);
+# ifdef _IBMR2
+ pty_preopen = 1;
+# endif
+ *ttyn = TtyName;
+ return f;
+}
+#endif
+
+/***************************************************************/
+
+#if defined(HAVE_OPENPTY) && !defined(PTY_DONE)
+#define PTY_DONE
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ int f, s;
+ if (openpty(&f, &s, TtyName, NULL, NULL) != 0)
+ return -1;
+ close(s);
+ initmaster(f);
+ pty_preopen = 1;
+ *ttyn = TtyName;
+ return f;
+}
+#endif
+
+/***************************************************************/
+
+#ifndef PTY_DONE
+int
+OpenPTY(ttyn)
+char **ttyn;
+{
+ register char *p, *q, *l, *d;
+ register int f;
+
+ debug("OpenPTY: Using BSD style ptys.\n");
+ strcpy(PtyName, PtyProto);
+ strcpy(TtyName, TtyProto);
+ 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++)
+ {
+ debug1("OpenPTY tries '%s'\n", PtyName);
+ if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1)
+ continue;
+ q[0] = *l;
+ q[1] = *d;
+ if (eff_uid && access(TtyName, R_OK | W_OK))
+ {
+ close(f);
+ continue;
+ }
+#if defined(sun) && 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
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