| File: | /rootdir/_build/../src/pty.cc |
| Warning: | line 189, column 22 Value stored to 'errsv' during its initialization is never read |
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| 1 | /* |
| 2 | * Copyright (C) 2001,2002 Red Hat, Inc. |
| 3 | * Copyright © 2009, 2010, 2019 Christian Persch |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 3 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | /** |
| 21 | * SECTION: bte-pty |
| 22 | * @short_description: Functions for starting a new process on a new pseudo-terminal and for |
| 23 | * manipulating pseudo-terminals |
| 24 | * |
| 25 | * The terminal widget uses these functions to start commands with new controlling |
| 26 | * pseudo-terminals and to resize pseudo-terminals. |
| 27 | */ |
| 28 | |
| 29 | #include "config.h" |
| 30 | |
| 31 | #include "pty.hh" |
| 32 | |
| 33 | #include "libc-glue.hh" |
| 34 | |
| 35 | #include <bte/bte.h> |
| 36 | #include "bteptyinternal.hh" |
| 37 | |
| 38 | #include <assert.h> |
| 39 | #include <sys/types.h> |
| 40 | #include <sys/ioctl.h> |
| 41 | #include <sys/socket.h> |
| 42 | #ifdef HAVE_SYS_TERMIOS_H |
| 43 | #include <sys/termios.h> |
| 44 | #endif |
| 45 | #include <errno(*__errno_location ()).h> |
| 46 | #include <fcntl.h> |
| 47 | #include <limits.h> |
| 48 | #ifdef HAVE_SYS_SYSLIMITS_H |
| 49 | #include <sys/syslimits.h> |
| 50 | #endif |
| 51 | #include <signal.h> |
| 52 | #include <pthread.h> |
| 53 | #include <stdio.h> |
| 54 | #include <stdlib.h> |
| 55 | #include <string.h> |
| 56 | #ifdef HAVE_TERMIOS_H |
| 57 | #include <termios.h> |
| 58 | #endif |
| 59 | #include <unistd.h> |
| 60 | #ifdef HAVE_UTIL_H |
| 61 | #include <util.h> |
| 62 | #endif |
| 63 | #ifdef HAVE_PTY_H |
| 64 | #include <pty.h> |
| 65 | #endif |
| 66 | #if defined(__sun) && defined(HAVE_STROPTS_H) |
| 67 | #include <stropts.h> |
| 68 | #endif |
| 69 | #include <glib.h> |
| 70 | #include <gio/gio.h> |
| 71 | #include "debug.h" |
| 72 | |
| 73 | #include <glib/gi18n-lib.h> |
| 74 | |
| 75 | #include "glib-glue.hh" |
| 76 | |
| 77 | #include "btedefines.hh" |
| 78 | |
| 79 | #include "missing.hh" |
| 80 | |
| 81 | namespace bte::base { |
| 82 | |
| 83 | Pty* |
| 84 | Pty::ref() noexcept |
| 85 | { |
| 86 | g_atomic_int_inc(&m_refcount)(__extension__ ({ static_assert (sizeof *(&m_refcount) == sizeof (gint), "Expression evaluates to false"); (void) (0 ? *(&m_refcount) ^ *(&m_refcount) : 1); (void) __atomic_fetch_add ((&m_refcount), 1, 5); })); |
| 87 | return this; |
| 88 | } |
| 89 | |
| 90 | void |
| 91 | Pty::unref() noexcept |
| 92 | { |
| 93 | if (g_atomic_int_dec_and_test(&m_refcount)(__extension__ ({ static_assert (sizeof *(&m_refcount) == sizeof (gint), "Expression evaluates to false"); (void) (0 ? *(&m_refcount) ^ *(&m_refcount) : 1); __atomic_fetch_sub ((&m_refcount), 1, 5) == 1; }))) |
| 94 | delete this; |
| 95 | } |
| 96 | |
| 97 | int |
| 98 | Pty::get_peer(bool cloexec) const noexcept |
| 99 | { |
| 100 | if (!m_pty_fd) |
| 101 | return -1; |
| 102 | |
| 103 | /* FIXME? else if (m_flags & BTE_PTY_NO_CTTTY) |
| 104 | * No session and no controlling TTY wanted, do we need to lose our controlling TTY, |
| 105 | * perhaps by open("/dev/tty") + ioctl(TIOCNOTTY) ? |
| 106 | */ |
| 107 | |
| 108 | /* Now open the PTY peer. Note that this also makes the PTY our controlling TTY. */ |
| 109 | auto const fd_flags = int{O_RDWR02 | |
| 110 | ((m_flags & BTE_PTY_NO_CTTY) ? O_NOCTTY0400 : 0) | |
| 111 | (cloexec ? O_CLOEXEC02000000 : 0)}; |
| 112 | |
| 113 | auto peer_fd = bte::libc::FD{}; |
| 114 | |
| 115 | #ifdef __linux__1 |
| 116 | peer_fd = ioctl(m_pty_fd.get(), TIOCGPTPEER(((0U) << (((0 +8)+8)+14)) | ((('T')) << (0 +8)) | (((0x41)) << 0) | ((0) << ((0 +8)+8))), fd_flags); |
| 117 | /* Note: According to the kernel's own tests (tools/testing/selftests/filesystems/devpts_pts.c), |
| 118 | * the error returned when the running kernel does not support this ioctl should be EINVAL. |
| 119 | * However it appears that the actual error returned is ENOTTY. So we check for both of them. |
| 120 | * See issue#182. |
| 121 | */ |
| 122 | if (!peer_fd && |
| 123 | errno(*__errno_location ()) != EINVAL22 && |
| 124 | errno(*__errno_location ()) != ENOTTY25) { |
| 125 | auto errsv = bte::libc::ErrnoSaver{}; |
| 126 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 127 | "ioctl(TIOCGPTPEER)", g_strerror(errsv))do { } while(0); |
| 128 | return -1; |
| 129 | } |
| 130 | |
| 131 | /* Fall back to ptsname + open */ |
| 132 | #endif |
| 133 | |
| 134 | if (!peer_fd) { |
| 135 | auto const name = ptsname(m_pty_fd.get()); |
| 136 | if (name == nullptr) { |
| 137 | auto errsv = bte::libc::ErrnoSaver{}; |
| 138 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 139 | "ptsname", g_strerror(errsv))do { } while(0); |
| 140 | return -1; |
| 141 | } |
| 142 | |
| 143 | _bte_debug_print (BTE_DEBUG_PTY,do { } while(0) |
| 144 | "Setting up child pty: master FD = %d name = %s\n",do { } while(0) |
| 145 | m_pty_fd.get(), name)do { } while(0); |
| 146 | |
| 147 | peer_fd = ::open(name, fd_flags); |
| 148 | if (!peer_fd) { |
| 149 | auto errsv = bte::libc::ErrnoSaver{}; |
| 150 | _bte_debug_print (BTE_DEBUG_PTY, "Failed to open PTY: %s\n",do { } while(0) |
| 151 | g_strerror(errsv))do { } while(0); |
| 152 | return -1; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | assert(bool(peer_fd))(static_cast <bool> (bool(peer_fd)) ? void (0) : __assert_fail ("bool(peer_fd)", "../src/pty.cc", 156, __extension__ __PRETTY_FUNCTION__ )); |
| 157 | |
| 158 | #if defined(__sun) && defined(HAVE_STROPTS_H) |
| 159 | /* See https://illumos.org/man/7i/streamio */ |
| 160 | if (isastream (peer_fd.get()) == 1) { |
| 161 | /* https://illumos.org/man/7m/ptem */ |
| 162 | if ((ioctl(peer_fd.get(), I_FIND, "ptem") == 0) && |
| 163 | (ioctl(peer_fd.get(), I_PUSH, "ptem") == -1)) { |
| 164 | return -1; |
| 165 | } |
| 166 | /* https://illumos.org/man/7m/ldterm */ |
| 167 | if ((ioctl(peer_fd.get(), I_FIND, "ldterm") == 0) && |
| 168 | (ioctl(peer_fd.get(), I_PUSH, "ldterm") == -1)) { |
| 169 | return -1; |
| 170 | } |
| 171 | /* https://illumos.org/man/7m/ttcompat */ |
| 172 | if ((ioctl(peer_fd.get(), I_FIND, "ttcompat") == 0) && |
| 173 | (ioctl(peer_fd.get(), I_PUSH, "ttcompat") == -1)) { |
| 174 | return -1; |
| 175 | } |
| 176 | } |
| 177 | #endif |
| 178 | |
| 179 | return peer_fd.release(); |
| 180 | } |
| 181 | |
| 182 | void |
| 183 | Pty::child_setup() const noexcept |
| 184 | { |
| 185 | /* Unblock all signals */ |
| 186 | sigset_t set; |
| 187 | sigemptyset(&set); |
| 188 | if (pthread_sigmask(SIG_SETMASK2, &set, nullptr) == -1) { |
| 189 | auto errsv = bte::libc::ErrnoSaver{}; |
Value stored to 'errsv' during its initialization is never read | |
| 190 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 191 | "pthread_sigmask", g_strerror(errsv))do { } while(0); |
| 192 | _exit(127); |
| 193 | } |
| 194 | |
| 195 | /* Reset the handlers for all signals to their defaults. The parent |
| 196 | * (or one of the libraries it links to) may have changed one to be ignored. |
| 197 | */ |
| 198 | for (int n = 1; n < NSIG(64 + 1); n++) { |
| 199 | if (n == SIGSTOP19 || n == SIGKILL9) |
| 200 | continue; |
| 201 | |
| 202 | signal(n, SIG_DFL((__sighandler_t) 0)); |
| 203 | } |
| 204 | |
| 205 | if (!(m_flags & BTE_PTY_NO_SESSION)) { |
| 206 | /* This starts a new session; we become its process-group leader, |
| 207 | * and lose our controlling TTY. |
| 208 | */ |
| 209 | _bte_debug_print (BTE_DEBUG_PTY, "Starting new session\n")do { } while(0); |
| 210 | if (setsid() == -1) { |
| 211 | auto errsv = bte::libc::ErrnoSaver{}; |
| 212 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 213 | "setsid", g_strerror(errsv))do { } while(0); |
| 214 | _exit(127); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | auto peer_fd = get_peer(); |
| 219 | if (peer_fd == -1) |
| 220 | _exit(127); |
| 221 | |
| 222 | #ifdef TIOCSCTTY0x540E |
| 223 | /* On linux, opening the PTY peer above already made it our controlling TTY (since |
| 224 | * previously there was none, after the setsid() call). However, it appears that e.g. |
| 225 | * on *BSD, that doesn't happen, so we need this explicit ioctl here. |
| 226 | */ |
| 227 | if (!(m_flags & BTE_PTY_NO_CTTY)) { |
| 228 | if (ioctl(peer_fd, TIOCSCTTY0x540E, peer_fd) != 0) { |
| 229 | auto errsv = bte::libc::ErrnoSaver{}; |
| 230 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 231 | "ioctl(TIOCSCTTY)", g_strerror(errsv))do { } while(0); |
| 232 | _exit(127); |
| 233 | } |
| 234 | } |
| 235 | #endif |
| 236 | |
| 237 | /* now setup child I/O through the tty */ |
| 238 | if (peer_fd != STDIN_FILENO0) { |
| 239 | if (dup2(peer_fd, STDIN_FILENO0) != STDIN_FILENO0){ |
| 240 | _exit (127); |
| 241 | } |
| 242 | } |
| 243 | if (peer_fd != STDOUT_FILENO1) { |
| 244 | if (dup2(peer_fd, STDOUT_FILENO1) != STDOUT_FILENO1){ |
| 245 | _exit (127); |
| 246 | } |
| 247 | } |
| 248 | if (peer_fd != STDERR_FILENO2) { |
| 249 | if (dup2(peer_fd, STDERR_FILENO2) != STDERR_FILENO2){ |
| 250 | _exit (127); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /* If the peer FD has not been consumed above as one of the stdio descriptors, |
| 255 | * need to close it now so that it doesn't leak to the child. |
| 256 | */ |
| 257 | if (peer_fd != STDIN_FILENO0 && |
| 258 | peer_fd != STDOUT_FILENO1 && |
| 259 | peer_fd != STDERR_FILENO2) { |
| 260 | close(peer_fd); |
| 261 | } |
| 262 | |
| 263 | /* Now set the TERM environment variable */ |
| 264 | /* FIXME: Setting environment here seems to have no effect, the merged envp2 will override on exec. |
| 265 | * By the way, we'd need to set the one from there, if any. */ |
| 266 | g_setenv("TERM", BTE_TERMINFO_NAME"xterm-256color", TRUE(!(0))); |
| 267 | |
| 268 | char version[7]; |
| 269 | g_snprintf (version, sizeof (version), "%u", BTE_VERSION_NUMERIC(((0)) * 10000 + ((65)) * 100 + ((0)))); |
| 270 | g_setenv ("BTE_VERSION", version, TRUE(!(0))); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Pty::set_size: |
| 275 | * @rows: the desired number of rows |
| 276 | * @columns: the desired number of columns |
| 277 | * @cell_height_px: the height of a cell in px, or 0 for undetermined |
| 278 | * @cell_width_px: the width of a cell in px, or 0 for undetermined |
| 279 | * |
| 280 | * Attempts to resize the pseudo terminal's window size. If successful, the |
| 281 | * OS kernel will send #SIGWINCH to the child process group. |
| 282 | * |
| 283 | * Returns: %true on success, or %false on error with errno set |
| 284 | */ |
| 285 | bool |
| 286 | Pty::set_size(int rows, |
| 287 | int columns, |
| 288 | int cell_height_px, |
| 289 | int cell_width_px) const noexcept |
| 290 | { |
| 291 | auto master = fd(); |
| 292 | |
| 293 | struct winsize size; |
| 294 | memset(&size, 0, sizeof(size)); |
| 295 | size.ws_row = rows > 0 ? rows : 24; |
| 296 | size.ws_col = columns > 0 ? columns : 80; |
| 297 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 298 | "Setting size on fd %d to (%d,%d).\n",do { } while(0) |
| 299 | master, columns, rows)do { } while(0); |
| 300 | auto ret = ioctl(master, TIOCSWINSZ0x5414, &size); |
| 301 | |
| 302 | if (ret != 0) { |
| 303 | auto errsv = bte::libc::ErrnoSaver{}; |
| 304 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 305 | "Failed to set size on %d: %s\n",do { } while(0) |
| 306 | master, g_strerror(errsv))do { } while(0); |
| 307 | } |
| 308 | |
| 309 | return ret == 0; |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * Pty::get_size: |
| 314 | * @rows: (out) (allow-none): a location to store the number of rows, or %NULL |
| 315 | * @columns: (out) (allow-none): a location to store the number of columns, or %NULL |
| 316 | * |
| 317 | * Reads the pseudo terminal's window size. |
| 318 | * |
| 319 | * If getting the window size failed, @error will be set to a #GIOError. |
| 320 | * |
| 321 | * Returns: %true on success, or %false on error with errno set |
| 322 | */ |
| 323 | bool |
| 324 | Pty::get_size(int* rows, |
| 325 | int* columns) const noexcept |
| 326 | { |
| 327 | auto master = fd(); |
| 328 | |
| 329 | struct winsize size; |
| 330 | memset(&size, 0, sizeof(size)); |
| 331 | auto ret = ioctl(master, TIOCGWINSZ0x5413, &size); |
| 332 | if (ret == 0) { |
| 333 | if (columns != nullptr) { |
| 334 | *columns = size.ws_col; |
| 335 | } |
| 336 | if (rows != nullptr) { |
| 337 | *rows = size.ws_row; |
| 338 | } |
| 339 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 340 | "Size on fd %d is (%d,%d).\n",do { } while(0) |
| 341 | master, size.ws_col, size.ws_row)do { } while(0); |
| 342 | return true; |
| 343 | } |
| 344 | |
| 345 | auto errsv = bte::libc::ErrnoSaver{}; |
| 346 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 347 | "Failed to read size from fd %d: %s\n",do { } while(0) |
| 348 | master, g_strerror(errsv))do { } while(0); |
| 349 | |
| 350 | return false; |
| 351 | } |
| 352 | |
| 353 | static int |
| 354 | fd_set_cpkt(bte::libc::FD& fd) |
| 355 | { |
| 356 | /* tty_ioctl(4) -> every read() gives an extra byte at the beginning |
| 357 | * notifying us of stop/start (^S/^Q) events. */ |
| 358 | int one = 1; |
| 359 | return ioctl(fd.get(), TIOCPKT0x5420, &one); |
| 360 | } |
| 361 | |
| 362 | static int |
| 363 | fd_setup(bte::libc::FD& fd) |
| 364 | { |
| 365 | if (grantpt(fd.get()) != 0) { |
| 366 | auto errsv = bte::libc::ErrnoSaver{}; |
| 367 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 368 | "grantpt", g_strerror(errsv))do { } while(0); |
| 369 | return -1; |
| 370 | } |
| 371 | |
| 372 | if (unlockpt(fd.get()) != 0) { |
| 373 | auto errsv = bte::libc::ErrnoSaver{}; |
| 374 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 375 | "unlockpt", g_strerror(errsv))do { } while(0); |
| 376 | return -1; |
| 377 | } |
| 378 | |
| 379 | if (bte::libc::fd_set_cloexec(fd.get()) < 0) { |
| 380 | auto errsv = bte::libc::ErrnoSaver{}; |
| 381 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 382 | "%s failed: %s",do { } while(0) |
| 383 | "Setting CLOEXEC flag", g_strerror(errsv))do { } while(0); |
| 384 | return -1; |
| 385 | } |
| 386 | |
| 387 | if (bte::libc::fd_set_nonblock(fd.get()) < 0) { |
| 388 | auto errsv = bte::libc::ErrnoSaver{}; |
| 389 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 390 | "%s failed: %s",do { } while(0) |
| 391 | "Setting O_NONBLOCK flag", g_strerror(errsv))do { } while(0); |
| 392 | return -1; |
| 393 | } |
| 394 | |
| 395 | if (fd_set_cpkt(fd) < 0) { |
| 396 | auto errsv = bte::libc::ErrnoSaver{}; |
| 397 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 398 | "%s failed: %s",do { } while(0) |
| 399 | "ioctl(TIOCPKT)", g_strerror(errsv))do { } while(0); |
| 400 | return -1; |
| 401 | } |
| 402 | |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * _bte_pty_open_posix: |
| 408 | * @pty: a #BtePty |
| 409 | * @error: a location to store a #GError, or %NULL |
| 410 | * |
| 411 | * Opens a new file descriptor to a new PTY master. |
| 412 | * |
| 413 | * Returns: the new PTY's master FD, or -1 |
| 414 | */ |
| 415 | static bte::libc::FD |
| 416 | _bte_pty_open_posix(void) |
| 417 | { |
| 418 | /* Attempt to open the master. */ |
| 419 | auto fd = bte::libc::FD{posix_openpt(O_RDWR02 | O_NOCTTY0400 | O_NONBLOCK04000 | O_CLOEXEC02000000)}; |
| 420 | #ifndef __linux__1 |
| 421 | /* Other kernels may not support CLOEXEC or NONBLOCK above, so try to fall back */ |
| 422 | bool need_cloexec = false, need_nonblocking = false; |
| 423 | if (!fd && errno(*__errno_location ()) == EINVAL22) { |
| 424 | /* Try without NONBLOCK and apply the flag afterward */ |
| 425 | need_nonblocking = true; |
| 426 | fd = posix_openpt(O_RDWR02 | O_NOCTTY0400 | O_CLOEXEC02000000); |
| 427 | if (!fd && errno(*__errno_location ()) == EINVAL22) { |
| 428 | /* Try without CLOEXEC and apply the flag afterwards */ |
| 429 | need_cloexec = true; |
| 430 | fd = posix_openpt(O_RDWR02 | O_NOCTTY0400); |
| 431 | } |
| 432 | } |
| 433 | #endif /* !linux */ |
| 434 | |
| 435 | if (!fd) { |
| 436 | auto errsv = bte::libc::ErrnoSaver{}; |
| 437 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 438 | "%s failed: %s",do { } while(0) |
| 439 | "posix_openpt", g_strerror(errsv))do { } while(0); |
| 440 | return {}; |
| 441 | } |
| 442 | |
| 443 | #ifndef __linux__1 |
| 444 | if (need_cloexec && bte::libc::fd_set_cloexec(fd.get()) < 0) { |
| 445 | auto errsv = bte::libc::ErrnoSaver{}; |
| 446 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 447 | "%s failed: %s",do { } while(0) |
| 448 | "Setting CLOEXEC flag", g_strerror(errsv))do { } while(0); |
| 449 | return {}; |
| 450 | } |
| 451 | |
| 452 | if (need_nonblocking && bte::libc::fd_set_nonblock(fd.get()) < 0) { |
| 453 | auto errsv = bte::libc::ErrnoSaver{}; |
| 454 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 455 | "%s failed: %s",do { } while(0) |
| 456 | "Setting NONBLOCK flag", g_strerror(errsv))do { } while(0); |
| 457 | return {}; |
| 458 | } |
| 459 | #endif /* !linux */ |
| 460 | |
| 461 | if (fd_set_cpkt(fd) < 0) { |
| 462 | auto errsv = bte::libc::ErrnoSaver{}; |
| 463 | _bte_debug_print(BTE_DEBUG_PTY,do { } while(0) |
| 464 | "%s failed: %s",do { } while(0) |
| 465 | "ioctl(TIOCPKT)", g_strerror(errsv))do { } while(0); |
| 466 | return {}; |
| 467 | } |
| 468 | |
| 469 | if (grantpt(fd.get()) != 0) { |
| 470 | auto errsv = bte::libc::ErrnoSaver{}; |
| 471 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 472 | "grantpt", g_strerror(errsv))do { } while(0); |
| 473 | return {}; |
| 474 | } |
| 475 | |
| 476 | if (unlockpt(fd.get()) != 0) { |
| 477 | auto errsv = bte::libc::ErrnoSaver{}; |
| 478 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s\n",do { } while(0) |
| 479 | "unlockpt", g_strerror(errsv))do { } while(0); |
| 480 | return {}; |
| 481 | } |
| 482 | |
| 483 | _bte_debug_print(BTE_DEBUG_PTY, "Allocated pty on fd %d.\n", fd.get())do { } while(0); |
| 484 | |
| 485 | return fd; |
| 486 | } |
| 487 | |
| 488 | static bte::libc::FD |
| 489 | _bte_pty_open_foreign(int masterfd /* consumed */) |
| 490 | { |
| 491 | auto fd = bte::libc::FD{masterfd}; |
| 492 | if (!fd) { |
| 493 | errno(*__errno_location ()) = EBADF9; |
| 494 | return {}; |
| 495 | } |
| 496 | |
| 497 | if (fd_setup(fd) < 0) |
| 498 | return {}; |
| 499 | |
| 500 | return fd; |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * Pty::set_utf8: |
| 505 | * @utf8: whether or not the pty is in UTF-8 mode |
| 506 | * |
| 507 | * Tells the kernel whether the terminal is UTF-8 or not, in case it can make |
| 508 | * use of the info. Linux 2.6.5 or so defines IUTF8 to make the line |
| 509 | * discipline do multibyte backspace correctly. |
| 510 | * |
| 511 | * Returns: %true on success, or %false on error with errno set |
| 512 | */ |
| 513 | bool |
| 514 | Pty::set_utf8(bool utf8) const noexcept |
| 515 | { |
| 516 | #ifdef IUTF80040000 |
| 517 | struct termios tio; |
| 518 | if (tcgetattr(fd(), &tio) == -1) { |
| 519 | auto errsv = bte::libc::ErrnoSaver{}; |
| 520 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s",do { } while(0) |
| 521 | "tcgetattr", g_strerror(errsv))do { } while(0); |
| 522 | return false; |
| 523 | } |
| 524 | |
| 525 | auto saved_cflag = tio.c_iflag; |
| 526 | if (utf8) { |
| 527 | tio.c_iflag |= IUTF80040000; |
| 528 | } else { |
| 529 | tio.c_iflag &= ~IUTF80040000; |
| 530 | } |
| 531 | |
| 532 | /* Only set the flag if it changes */ |
| 533 | if (saved_cflag != tio.c_iflag && |
| 534 | tcsetattr(fd(), TCSANOW0, &tio) == -1) { |
| 535 | auto errsv = bte::libc::ErrnoSaver{}; |
| 536 | _bte_debug_print(BTE_DEBUG_PTY, "%s failed: %s",do { } while(0) |
| 537 | "tcsetattr", g_strerror(errsv))do { } while(0); |
| 538 | return false; |
| 539 | } |
| 540 | #endif |
| 541 | |
| 542 | return true; |
| 543 | } |
| 544 | |
| 545 | Pty* |
| 546 | Pty::create(BtePtyFlags flags) |
| 547 | { |
| 548 | auto fd = _bte_pty_open_posix(); |
| 549 | if (!fd) |
| 550 | return nullptr; |
| 551 | |
| 552 | return new Pty{std::move(fd), flags}; |
| 553 | } |
| 554 | |
| 555 | Pty* |
| 556 | Pty::create_foreign(int foreign_fd, |
| 557 | BtePtyFlags flags) |
| 558 | { |
| 559 | auto fd = _bte_pty_open_foreign(foreign_fd); |
| 560 | if (!fd) |
| 561 | return nullptr; |
| 562 | |
| 563 | return new Pty{std::move(fd), flags}; |
| 564 | } |
| 565 | |
| 566 | } // namespace bte::base |