pty.c revision 256281
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 24#include <sys/types.h> 25#include <sys/stat.h> 26#include <fcntl.h> 27#include <signal.h> 28 29#include "config.h" 30#include "screen.h" 31 32#ifndef sun 33# include <sys/ioctl.h> 34#endif 35 36/* for solaris 2.1, Unixware (SVR4.2) and possibly others */ 37#ifdef HAVE_SVR4_PTYS 38# include <sys/stropts.h> 39#endif 40 41#if defined(sun) && defined(LOCKPTY) && !defined(TIOCEXCL) 42# include <sys/ttold.h> 43#endif 44 45#ifdef ISC 46# include <sys/tty.h> 47# include <sys/sioctl.h> 48# include <sys/pty.h> 49#endif 50 51#ifdef sgi 52# include <sys/sysmacros.h> 53#endif /* sgi */ 54 55#include "extern.h" 56 57/* 58 * if no PTYRANGE[01] is in the config file, we pick a default 59 */ 60#ifndef PTYRANGE0 61# define PTYRANGE0 "qpr" 62#endif 63#ifndef PTYRANGE1 64# define PTYRANGE1 "0123456789abcdef" 65#endif 66 67/* SVR4 pseudo ttys don't seem to work with SCO-5 */ 68#ifdef M_UNIX 69# undef HAVE_SVR4_PTYS 70#endif 71 72extern int eff_uid; 73 74/* used for opening a new pty-pair: */ 75static char PtyName[32], TtyName[32]; 76 77#if !(defined(sequent) || defined(_SEQUENT_) || defined(HAVE_SVR4_PTYS)) 78# ifdef hpux 79static char PtyProto[] = "/dev/ptym/ptyXY"; 80static char TtyProto[] = "/dev/pty/ttyXY"; 81# else 82# ifdef M_UNIX 83static char PtyProto[] = "/dev/ptypXY"; 84static char TtyProto[] = "/dev/ttypXY"; 85# else 86static char PtyProto[] = "/dev/ptyXY"; 87static char TtyProto[] = "/dev/ttyXY"; 88# endif 89# endif /* hpux */ 90#endif 91 92static void initmaster __P((int)); 93 94#if defined(sun) 95/* sun's utmp_update program opens the salve side, thus corrupting 96 */ 97int pty_preopen = 1; 98#else 99int pty_preopen = 0; 100#endif 101 102/* 103 * Open all ptys with O_NOCTTY, just to be on the safe side 104 * (RISCos mips breaks otherwise) 105 */ 106#ifndef O_NOCTTY 107# define O_NOCTTY 0 108#endif 109 110/***************************************************************/ 111 112static void 113initmaster(f) 114int f; 115{ 116#ifdef POSIX 117 tcflush(f, TCIOFLUSH); 118#else 119# ifdef TIOCFLUSH 120 (void) ioctl(f, TIOCFLUSH, (char *) 0); 121# endif 122#endif 123#ifdef LOCKPTY 124 (void) ioctl(f, TIOCEXCL, (char *) 0); 125#endif 126} 127 128void 129InitPTY(f) 130int f; 131{ 132 if (f < 0) 133 return; 134#if defined(I_PUSH) && defined(HAVE_SVR4_PTYS) && !defined(sgi) && !defined(linux) && !defined(__osf__) && !defined(M_UNIX) 135 if (ioctl(f, I_PUSH, "ptem")) 136 Panic(errno, "InitPTY: cannot I_PUSH ptem"); 137 if (ioctl(f, I_PUSH, "ldterm")) 138 Panic(errno, "InitPTY: cannot I_PUSH ldterm"); 139# ifdef sun 140 if (ioctl(f, I_PUSH, "ttcompat")) 141 Panic(errno, "InitPTY: cannot I_PUSH ttcompat"); 142# endif 143#endif 144} 145 146/***************************************************************/ 147 148#if defined(OSX) && !defined(PTY_DONE) 149#define PTY_DONE 150int 151OpenPTY(ttyn) 152char **ttyn; 153{ 154 register int f; 155 if ((f = open_controlling_pty(TtyName)) < 0) 156 return -1; 157 initmaster(f); 158 *ttyn = TtyName; 159 return f; 160} 161#endif 162 163/***************************************************************/ 164 165#if (defined(sequent) || defined(_SEQUENT_)) && !defined(PTY_DONE) 166#define PTY_DONE 167int 168OpenPTY(ttyn) 169char **ttyn; 170{ 171 char *m, *s; 172 register int f; 173 174 if ((f = getpseudotty(&s, &m)) < 0) 175 return -1; 176#ifdef _SEQUENT_ 177 fvhangup(s); 178#endif 179 strncpy(PtyName, m, sizeof(PtyName)); 180 strncpy(TtyName, s, sizeof(TtyName)); 181 initmaster(f); 182 *ttyn = TtyName; 183 return f; 184} 185#endif 186 187/***************************************************************/ 188 189#if defined(__sgi) && !defined(PTY_DONE) 190#define PTY_DONE 191int 192OpenPTY(ttyn) 193char **ttyn; 194{ 195 int f; 196 char *name, *_getpty(); 197 sigret_t (*sigcld)__P(SIGPROTOARG); 198 199 /* 200 * SIGCHLD set to SIG_DFL for _getpty() because it may fork() and 201 * exec() /usr/adm/mkpts 202 */ 203 sigcld = signal(SIGCHLD, SIG_DFL); 204 name = _getpty(&f, O_RDWR | O_NONBLOCK, 0600, 0); 205 signal(SIGCHLD, sigcld); 206 207 if (name == 0) 208 return -1; 209 initmaster(f); 210 *ttyn = name; 211 return f; 212} 213#endif 214 215/***************************************************************/ 216 217#if defined(MIPS) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE) 218#define PTY_DONE 219int 220OpenPTY(ttyn) 221char **ttyn; 222{ 223 register int f; 224 struct stat buf; 225 226 strcpy(PtyName, "/dev/ptc"); 227 if ((f = open(PtyName, O_RDWR | O_NOCTTY | O_NONBLOCK)) < 0) 228 return -1; 229 if (fstat(f, &buf) < 0) 230 { 231 close(f); 232 return -1; 233 } 234 sprintf(TtyName, "/dev/ttyq%d", minor(buf.st_rdev)); 235 initmaster(f); 236 *ttyn = TtyName; 237 return f; 238} 239#endif 240 241/***************************************************************/ 242 243#if defined(HAVE_SVR4_PTYS) && !defined(PTY_DONE) 244#define PTY_DONE 245int 246OpenPTY(ttyn) 247char **ttyn; 248{ 249 register int f; 250 char *m, *ptsname(); 251 int unlockpt __P((int)), grantpt __P((int)); 252#if defined(HAVE_GETPT) && defined(linux) 253 int getpt __P((void)); 254#endif 255 sigret_t (*sigcld)__P(SIGPROTOARG); 256 257 strcpy(PtyName, "/dev/ptmx"); 258#if defined(HAVE_GETPT) && defined(linux) 259 if ((f = getpt()) == -1) 260#else 261 if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1) 262#endif 263 return -1; 264 265 /* 266 * SIGCHLD set to SIG_DFL for grantpt() because it fork()s and 267 * exec()s pt_chmod 268 */ 269 sigcld = signal(SIGCHLD, SIG_DFL); 270 if ((m = ptsname(f)) == NULL || grantpt(f) || unlockpt(f)) 271 { 272 signal(SIGCHLD, sigcld); 273 close(f); 274 return -1; 275 } 276 signal(SIGCHLD, sigcld); 277 strncpy(TtyName, m, sizeof(TtyName)); 278 initmaster(f); 279 *ttyn = TtyName; 280 return f; 281} 282#endif 283 284/***************************************************************/ 285 286#if defined(_AIX) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE) 287#define PTY_DONE 288 289int 290OpenPTY(ttyn) 291char **ttyn; 292{ 293 register int f; 294 295 /* a dumb looking loop replaced by mycrofts code: */ 296 strcpy (PtyName, "/dev/ptc"); 297 if ((f = open (PtyName, O_RDWR | O_NOCTTY)) < 0) 298 return -1; 299 strncpy(TtyName, ttyname(f), sizeof(TtyName)); 300 if (eff_uid && access(TtyName, R_OK | W_OK)) 301 { 302 close(f); 303 return -1; 304 } 305 initmaster(f); 306# ifdef _IBMR2 307 pty_preopen = 1; 308# endif 309 *ttyn = TtyName; 310 return f; 311} 312#endif 313 314/***************************************************************/ 315 316#if defined(HAVE_OPENPTY) && !defined(PTY_DONE) 317#define PTY_DONE 318int 319OpenPTY(ttyn) 320char **ttyn; 321{ 322 int f, s; 323 if (openpty(&f, &s, TtyName, NULL, NULL) != 0) 324 return -1; 325 close(s); 326 initmaster(f); 327 pty_preopen = 1; 328 *ttyn = TtyName; 329 return f; 330} 331#endif 332 333/***************************************************************/ 334 335#ifndef PTY_DONE 336int 337OpenPTY(ttyn) 338char **ttyn; 339{ 340 register char *p, *q, *l, *d; 341 register int f; 342 343 debug("OpenPTY: Using BSD style ptys.\n"); 344 strcpy(PtyName, PtyProto); 345 strcpy(TtyName, TtyProto); 346 for (p = PtyName; *p != 'X'; p++) 347 ; 348 for (q = TtyName; *q != 'X'; q++) 349 ; 350 for (l = PTYRANGE0; (*p = *l) != '\0'; l++) 351 { 352 for (d = PTYRANGE1; (p[1] = *d) != '\0'; d++) 353 { 354 debug1("OpenPTY tries '%s'\n", PtyName); 355 if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1) 356 continue; 357 q[0] = *l; 358 q[1] = *d; 359 if (eff_uid && access(TtyName, R_OK | W_OK)) 360 { 361 close(f); 362 continue; 363 } 364#if defined(sun) && defined(TIOCGPGRP) && !defined(SUNOS3) 365 /* Hack to ensure that the slave side of the pty is 366 * unused. May not work in anything other than SunOS4.1 367 */ 368 { 369 int pgrp; 370 371 /* tcgetpgrp does not work (uses TIOCGETPGRP)! */ 372 if (ioctl(f, TIOCGPGRP, (char *)&pgrp) != -1 || errno != EIO) 373 { 374 close(f); 375 continue; 376 } 377 } 378#endif 379 initmaster(f); 380 *ttyn = TtyName; 381 return f; 382 } 383 } 384 return -1; 385} 386#endif 387 388