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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.41 by sf-exg, Fri Nov 11 15:11:18 2011 UTC vs.
Revision 1.56 by sf-exg, Fri May 1 13:12:17 2015 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
4/*----------------------------------------------------------------------* 1/*----------------------------------------------------------------------*
5 * File: ptytty.C 2 * File: ptytty.C
6 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
7 * 4 *
8 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
… …
27 24
28#include "config.h" 25#include "config.h"
29 26
30#include "ptytty.h" 27#include "ptytty.h"
31 28
32#include <cstdlib> 29#include <stdlib.h>
30#include <stdio.h>
33#include <cstring> 31#include <string.h>
34#include <csignal>
35 32
36#include <sys/types.h> 33#include <sys/types.h>
37#include <sys/stat.h> 34#include <sys/stat.h>
38#include <unistd.h> 35#include <unistd.h>
39#include <fcntl.h> 36#include <fcntl.h>
40 37
41#ifdef HAVE_SYS_IOCTL_H 38#ifdef HAVE_SYS_IOCTL_H
42# include <sys/ioctl.h> 39# include <sys/ioctl.h>
43#endif 40#endif
44#if defined(HAVE_SYS_STROPTS_H) 41#ifdef HAVE_STROPTS_H
45# include <sys/stropts.h> /* for I_PUSH */
46#endif
47#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
48# include <stropts.h> 42# include <stropts.h>
49#endif 43#endif
50#if defined(HAVE_PTY_H) 44#if defined(HAVE_PTY_H)
51# include <pty.h> 45# include <pty.h>
52#elif defined(HAVE_LIBUTIL_H) 46#elif defined(HAVE_LIBUTIL_H)
… …
56#endif 50#endif
57#ifdef TTY_GID_SUPPORT 51#ifdef TTY_GID_SUPPORT
58#include <grp.h> 52#include <grp.h>
59#endif 53#endif
60 54
61#include <cstdio> 55#ifndef O_NOCTTY
56# define O_NOCTTY 0
57#endif
62 58
63///////////////////////////////////////////////////////////////////////////// 59/////////////////////////////////////////////////////////////////////////////
64 60
65/* ------------------------------------------------------------------------- * 61/* ------------------------------------------------------------------------- *
66 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 62 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
… …
76 get_pty (int *fd_tty, char **ttydev) 72 get_pty (int *fd_tty, char **ttydev)
77 { 73 {
78 int pfd; 74 int pfd;
79 75
80# if defined(HAVE_GETPT) 76# if defined(HAVE_GETPT)
81 pfd = getpt(); 77 pfd = getpt ();
82# elif defined(HAVE_POSIX_OPENPT) 78# elif defined(HAVE_POSIX_OPENPT)
83 pfd = posix_openpt (O_RDWR | O_NOCTTY); 79 pfd = posix_openpt (O_RDWR | O_NOCTTY);
84# else 80# else
85# ifdef _AIX 81# ifdef _AIX
86 pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0); 82 pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
… …
130 get_pty (int *fd_tty, char **ttydev) 126 get_pty (int *fd_tty, char **ttydev)
131 { 127 {
132 int pfd; 128 int pfd;
133 char *slave; 129 char *slave;
134 130
135 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 131 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
136 132
137 if (slave != NULL) 133 if (slave != NULL)
138 { 134 {
139 *ttydev = strdup (slave); 135 *ttydev = strdup (slave);
140 return pfd; 136 return pfd;
… …
156 const char *majors = "pqrstuvwxyzabcde"; 152 const char *majors = "pqrstuvwxyzabcde";
157 const char *minors = "0123456789abcdef"; 153 const char *minors = "0123456789abcdef";
158 154
159 for (i = 0; i < 256; i++) 155 for (i = 0; i < 256; i++)
160 { 156 {
161 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 157 snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
162 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); 158 snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
163 159
164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 160 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
165 { 161 {
166 snprintf(pty_name, 32, "/dev/ptyp%d", i); 162 snprintf (pty_name, 32, "/dev/ptyp%d", i);
167 snprintf(tty_name, 32, "/dev/ttyp%d", i); 163 snprintf (tty_name, 32, "/dev/ttyp%d", i);
168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
169 continue; 165 continue;
170 } 166 }
171 167
172 if (access (tty_name, R_OK | W_OK) == 0) 168 if (access (tty_name, R_OK | W_OK) == 0)
… …
329{ 325{
330 /* get master (pty) */ 326 /* get master (pty) */
331 if ((pty = get_pty (&tty, &name)) < 0) 327 if ((pty = get_pty (&tty, &name)) < 0)
332 return false; 328 return false;
333 329
334 fcntl (pty, F_SETFL, O_NONBLOCK);
335
336 /* get slave (tty) */ 330 /* get slave (tty) */
337 if (tty < 0) 331 if (tty < 0)
338 { 332 {
339#ifndef NO_SETOWNER_TTYDEV 333#ifndef NO_SETOWNER_TTYDEV
340 chown (name, getuid (), ttyconf.gid); /* fail silently */ 334 chown (name, getuid (), ttyconf.gid); /* fail silently */
… …
356 * Push STREAMS modules: 350 * Push STREAMS modules:
357 * ptem: pseudo-terminal hardware emulation module. 351 * ptem: pseudo-terminal hardware emulation module.
358 * ldterm: standard terminal line discipline. 352 * ldterm: standard terminal line discipline.
359 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 353 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
360 * 354 *
361 * After we push the STREAMS modules, the first open () on the slave side 355 * On Solaris, a process can acquire a controlling terminal in the
362 * should make the "ptem" (or "ldterm" depending upon either which OS 356 * following ways:
363 * version or which set of manual pages you have) module give us a 357 * - open() of /dev/ptmx or of a slave device without O_NOCTTY
364 * controlling terminal. We must already have close ()d the master side 358 * - I_PUSH ioctl() of the "ptem" or "ldterm" module on a slave device
365 * fd in this child process before we push STREAMS modules on because the 359 * The second case is problematic, because it cannot be disabled.
366 * documentation is really unclear about whether it is any close () on 360 * Fortunately, Solaris (10 and 11 at least) provides an undocumented
367 * the master side or the last close () - i.e. a proper STREAMS dismantling 361 * __IPUSH_NOCTTY ioctl which does not have this side-effect, so we
368 * close () - on the master side which causes a hang up to be sent 362 * use it if defined. See
369 * through - Geoff Wing 363 * https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/os/streamio.c#L3755
364 * https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/io/ptem.c#L203
365 * https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/io/ldterm.c#L794
366 * Note that an open() of a slave device autoloads the modules,
367 * with __I_PUSH_NOCTTY, if xpg[46] mode is enabled (which requires
368 * linking /usr/lib/values-xpg[46].o).
369 * https://github.com/illumos/illumos-gate/blob/master/usr/src/lib/libc/port/sys/open.c#L173
370 */ 370 */
371
372#ifdef __I_PUSH_NOCTTY
373# define PT_I_PUSH __I_PUSH_NOCTTY
374#else
375# define PT_I_PUSH I_PUSH
376#endif
377
371#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H) 378#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
372 if (isastream (tty) == 1) 379 if (isastream (tty) == 1)
373# endif 380# endif
374 { 381 {
382 if (!ioctl (tty, I_FIND, "ptem"))
375 ioctl (tty, I_PUSH, "ptem"); 383 ioctl (tty, PT_I_PUSH, "ptem");
384
385 if (!ioctl (tty, I_FIND, "ldterm"))
376 ioctl (tty, I_PUSH, "ldterm"); 386 ioctl (tty, PT_I_PUSH, "ldterm");
387
388 if (!ioctl (tty, I_FIND, "ttcompat"))
377 ioctl (tty, I_PUSH, "ttcompat"); 389 ioctl (tty, PT_I_PUSH, "ttcompat");
378 } 390 }
379#endif 391#endif
380 392
393#if UTMP_SUPPORT
394# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
395 int fd_stdin = dup (STDIN_FILENO);
396 dup2 (tty, STDIN_FILENO);
397
398 utmp_pos = ttyslot ();
399
400 dup2 (fd_stdin, STDIN_FILENO);
401 close (fd_stdin);
402# endif
403#endif
404
381 return true; 405 return true;
382} 406}
383 407

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