readline/readline/examples/rlfe/pty.c

   1 /* Copyright (c) 1993-2002
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  * Copyright (c) 1987 Oliver Laumann
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program (see the file COPYING); if not, write to the
  18  * Free Software Foundation, Inc.,
  19  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  20  *
  21  ****************************************************************
  22  */
  23 #include "config.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29
  30 #include <unistd.h>
  31
  32 #include "screen.h"
  33
  34 #ifndef sun
  35 # include <sys/ioctl.h>
  36 #endif
  37
  38 /* for solaris 2.1, Unixware (SVR4.2) and possibly others */
  39 #if defined (HAVE_SVR4_PTYS) && defined (HAVE_SYS_STROPTS_H)
  40 # include <sys/stropts.h>
  41 #endif
  42
  43 #if defined(sun) && defined(LOCKPTY) && !defined(TIOCEXCL)
  44 # include <sys/ttold.h>
  45 #endif
  46
  47 #ifdef ISC
  48 # include <sys/tty.h>
  49 # include <sys/sioctl.h>
  50 # include <sys/pty.h>
  51 #endif
  52
  53 #ifdef sgi
  54 # include <sys/sysmacros.h>
  55 #endif /* sgi */
  56
  57 #include "extern.h"
  58
  59 /*
  60  * if no PTYRANGE[01] is in the config file, we pick a default
  61  */
  62 #ifndef PTYRANGE0
  63 # define PTYRANGE0 "qpr"
  64 #endif
  65 #ifndef PTYRANGE1
  66 # define PTYRANGE1 "0123456789abcdef"
  67 #endif
  68
  69 /* SVR4 pseudo ttys don't seem to work with SCO-5 */
  70 #ifdef M_UNIX
  71 # undef HAVE_SVR4_PTYS
  72 #endif
  73
  74 extern int eff_uid;
  75
  76 /* used for opening a new pty-pair: */
  77 static char PtyName[32], TtyName[32];
  78
  79 #if !(defined(sequent) || defined(_SEQUENT_) || defined(HAVE_SVR4_PTYS))
  80 # ifdef hpux
  81 static char PtyProto[] = "/dev/ptym/ptyXY";
  82 static char TtyProto[] = "/dev/pty/ttyXY";
  83 # else
  84 #  ifdef M_UNIX
  85 static char PtyProto[] = "/dev/ptypXY";
  86 static char TtyProto[] = "/dev/ttypXY";
  87 #  else
  88 static char PtyProto[] = "/dev/ptyXY";
  89 static char TtyProto[] = "/dev/ttyXY";
  90 #  endif
  91 # endif /* hpux */
  92 #endif
  93
  94 static void initmaster __P((int));
  95
  96 #if defined(sun)
  97 /* sun's utmp_update program opens the salve side, thus corrupting
  98  */
  99 int pty_preopen = 1;
 100 #else
 101 int pty_preopen = 0;
 102 #endif
 103
 104 /*
 105  *  Open all ptys with O_NOCTTY, just to be on the safe side
 106  *  (RISCos mips breaks otherwise)
 107  */
 108 #ifndef O_NOCTTY
 109 # define O_NOCTTY 0
 110 #endif
 111
 112 /***************************************************************/
 113
 114 static void
 115 initmaster(f)
 116 int f;
 117 {
 118 #ifdef POSIX
 119   tcflush(f, TCIOFLUSH);
 120 #else
 121 # ifdef TIOCFLUSH
 122   (void) ioctl(f, TIOCFLUSH, (char *) 0);
 123 # endif
 124 #endif
 125 #ifdef LOCKPTY
 126   (void) ioctl(f, TIOCEXCL, (char *) 0);
 127 #endif
 128 }
 129
 130 void
 131 InitPTY(f)
 132 int f;
 133 {
 134   if (f < 0)
 135     return;
 136 #if defined(I_PUSH) && defined(HAVE_SVR4_PTYS) && !defined(sgi) && !defined(linux) && !defined(__osf__) && !defined(M_UNIX)
 137   if (ioctl(f, I_PUSH, "ptem"))
 138     Panic(errno, "InitPTY: cannot I_PUSH ptem");
 139   if (ioctl(f, I_PUSH, "ldterm"))
 140     Panic(errno, "InitPTY: cannot I_PUSH ldterm");
 141 # ifdef sun
 142   if (ioctl(f, I_PUSH, "ttcompat"))
 143     Panic(errno, "InitPTY: cannot I_PUSH ttcompat");
 144 # endif
 145 #endif
 146 }
 147
 148 /***************************************************************/
 149
 150 #if defined(OSX) && !defined(PTY_DONE)
 151 #define PTY_DONE
 152 int
 153 OpenPTY(ttyn)
 154 char **ttyn;
 155 {
 156   register int f;
 157   if ((f = open_controlling_pty(TtyName)) < 0)
 158     return -1;
 159   initmaster(f);
 160   *ttyn = TtyName;
 161   return f;
 162 }
 163 #endif
 164
 165 /***************************************************************/
 166
 167 #if (defined(sequent) || defined(_SEQUENT_)) && !defined(PTY_DONE)
 168 #define PTY_DONE
 169 int
 170 OpenPTY(ttyn)
 171 char **ttyn;
 172 {
 173   char *m, *s;
 174   register int f;
 175
 176   if ((f = getpseudotty(&s, &m)) < 0)
 177     return -1;
 178 #ifdef _SEQUENT_
 179   fvhangup(s);
 180 #endif
 181   strncpy(PtyName, m, sizeof(PtyName));
 182   strncpy(TtyName, s, sizeof(TtyName));
 183   initmaster(f);
 184   *ttyn = TtyName;
 185   return f;
 186 }
 187 #endif
 188
 189 /***************************************************************/
 190
 191 #if defined(__sgi) && !defined(PTY_DONE)
 192 #define PTY_DONE
 193 int
 194 OpenPTY(ttyn)
 195 char **ttyn;
 196 {
 197   int f;
 198   char *name, *_getpty();
 199   sigret_t (*sigcld)__P(SIGPROTOARG);
 200
 201   /*
 202    * SIGCHLD set to SIG_DFL for _getpty() because it may fork() and
 203    * exec() /usr/adm/mkpts
 204    */
 205   sigcld = signal(SIGCHLD, SIG_DFL);
 206   name = _getpty(&f, O_RDWR | O_NONBLOCK, 0600, 0);
 207   signal(SIGCHLD, sigcld);
 208
 209   if (name == 0)
 210     return -1;
 211   initmaster(f);
 212   *ttyn = name;
 213   return f;
 214 }
 215 #endif
 216
 217 /***************************************************************/
 218
 219 #if defined(MIPS) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
 220 #define PTY_DONE
 221 int
 222 OpenPTY(ttyn)
 223 char **ttyn;
 224 {
 225   register int f;
 226   struct stat buf;
 227
 228   strcpy(PtyName, "/dev/ptc");
 229   if ((f = open(PtyName, O_RDWR | O_NOCTTY | O_NONBLOCK)) < 0)
 230     return -1;
 231   if (fstat(f, &buf) < 0)
 232     {
 233       close(f);
 234       return -1;
 235     }
 236   sprintf(TtyName, "/dev/ttyq%d", minor(buf.st_rdev));
 237   initmaster(f);
 238   *ttyn = TtyName;
 239   return f;
 240 }
 241 #endif
 242
 243 /***************************************************************/
 244
 245 #if defined(HAVE_SVR4_PTYS) && !defined(PTY_DONE)
 246 #define PTY_DONE
 247 int
 248 OpenPTY(ttyn)
 249 char **ttyn;
 250 {
 251   register int f;
 252   char *m, *ptsname();
 253   int unlockpt __P((int)), grantpt __P((int));
 254 #if defined(HAVE_GETPT) && defined(linux)
 255   int getpt __P((void));
 256 #endif
 257   sigret_t (*sigcld)__P(SIGPROTOARG);
 258
 259   strcpy(PtyName, "/dev/ptmx");
 260 #if defined(HAVE_GETPT) && defined(linux)
 261   if ((f = getpt()) == -1)
 262 #else
 263   if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1)
 264 #endif
 265     return -1;
 266
 267   /*
 268    * SIGCHLD set to SIG_DFL for grantpt() because it fork()s and
 269    * exec()s pt_chmod
 270    */
 271   sigcld = signal(SIGCHLD, SIG_DFL);
 272   if ((m = ptsname(f)) == NULL || grantpt(f) || unlockpt(f))
 273     {
 274       signal(SIGCHLD, sigcld);
 275       close(f);
 276       return -1;
 277     }
 278   signal(SIGCHLD, sigcld);
 279   strncpy(TtyName, m, sizeof(TtyName));
 280   initmaster(f);
 281   *ttyn = TtyName;
 282   return f;
 283 }
 284 #endif
 285
 286 /***************************************************************/
 287
 288 #if defined(_AIX) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
 289 #define PTY_DONE
 290
 291 int
 292 OpenPTY(ttyn)
 293 char **ttyn;
 294 {
 295   register int f;
 296
 297   /* a dumb looking loop replaced by mycrofts code: */
 298   strcpy (PtyName, "/dev/ptc");
 299   if ((f = open (PtyName, O_RDWR | O_NOCTTY)) < 0)
 300     return -1;
 301   strncpy(TtyName, ttyname(f), sizeof(TtyName));
 302   if (eff_uid && access(TtyName, R_OK | W_OK))
 303     {
 304       close(f);
 305       return -1;
 306     }
 307   initmaster(f);
 308 # ifdef _IBMR2
 309   pty_preopen = 1;
 310 # endif
 311   *ttyn = TtyName;
 312   return f;
 313 }
 314 #endif
 315
 316 /***************************************************************/
 317
 318 #if defined(HAVE_OPENPTY) && !defined(PTY_DONE)
 319 #define PTY_DONE
 320 int
 321 OpenPTY(ttyn)
 322 char **ttyn;
 323 {
 324   int f, s;
 325   if (openpty(&f, &s, TtyName, NULL, NULL) != 0)
 326     return -1;
 327   close(s);
 328   initmaster(f);
 329   pty_preopen = 1;
 330   *ttyn = TtyName;
 331   return f;
 332 }
 333 #endif
 334
 335 /***************************************************************/
 336
 337 #ifndef PTY_DONE
 338 int
 339 OpenPTY(ttyn)
 340 char **ttyn;
 341 {
 342   register char *p, *q, *l, *d;
 343   register int f;
 344
 345   debug("OpenPTY: Using BSD style ptys.\n");
 346   strcpy(PtyName, PtyProto);
 347   strcpy(TtyName, TtyProto);
 348   for (p = PtyName; *p != 'X'; p++)
 349     ;
 350   for (q = TtyName; *q != 'X'; q++)
 351     ;
 352   for (l = PTYRANGE0; (*p = *l) != '\0'; l++)
 353     {
 354       for (d = PTYRANGE1; (p[1] = *d) != '\0'; d++)
 355         {
 356           debug1("OpenPTY tries '%s'\n", PtyName);
 357           if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1)
 358             continue;
 359           q[0] = *l;
 360           q[1] = *d;
 361           if (eff_uid && access(TtyName, R_OK | W_OK))
 362             {
 363               close(f);
 364               continue;
 365             }
 366 #if defined(sun) && defined(TIOCGPGRP) && !defined(SUNOS3)
 367           /* Hack to ensure that the slave side of the pty is
 368            * unused. May not work in anything other than SunOS4.1
 369            */
 370             {
 371               int pgrp;
 372
 373               /* tcgetpgrp does not work (uses TIOCGETPGRP)! */
 374               if (ioctl(f, TIOCGPGRP, (char *)&pgrp) != -1 || errno != EIO)
 375                 {
 376                   close(f);
 377                   continue;
 378                 }
 379             }
 380 #endif
 381           initmaster(f);
 382           *ttyn = TtyName;
 383           return f;
 384         }
 385     }
 386   return -1;
 387 }
 388 #endif