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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