1 /* 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #include <stdio.h> 7 #include <unistd.h> 8 #include <errno.h> 9 #include <fcntl.h> 10 #include <signal.h> 11 #include <sys/ioctl.h> 12 #include <sys/mount.h> 13 #include <sys/socket.h> 14 #include <sys/stat.h> 15 #include <sys/un.h> 16 #include <sys/types.h> 17 #include <os.h> 18 19 static void copy_stat(struct uml_stat *dst, const struct stat64 *src) 20 { 21 *dst = ((struct uml_stat) { 22 .ust_dev = src->st_dev, /* device */ 23 .ust_ino = src->st_ino, /* inode */ 24 .ust_mode = src->st_mode, /* protection */ 25 .ust_nlink = src->st_nlink, /* number of hard links */ 26 .ust_uid = src->st_uid, /* user ID of owner */ 27 .ust_gid = src->st_gid, /* group ID of owner */ 28 .ust_size = src->st_size, /* total size, in bytes */ 29 .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */ 30 .ust_blocks = src->st_blocks, /* number of blocks allocated */ 31 .ust_atime = src->st_atime, /* time of last access */ 32 .ust_mtime = src->st_mtime, /* time of last modification */ 33 .ust_ctime = src->st_ctime, /* time of last change */ 34 }); 35 } 36 37 int os_stat_fd(const int fd, struct uml_stat *ubuf) 38 { 39 struct stat64 sbuf; 40 int err; 41 42 CATCH_EINTR(err = fstat64(fd, &sbuf)); 43 if (err < 0) 44 return -errno; 45 46 if (ubuf != NULL) 47 copy_stat(ubuf, &sbuf); 48 return err; 49 } 50 51 int os_stat_file(const char *file_name, struct uml_stat *ubuf) 52 { 53 struct stat64 sbuf; 54 int err; 55 56 CATCH_EINTR(err = stat64(file_name, &sbuf)); 57 if (err < 0) 58 return -errno; 59 60 if (ubuf != NULL) 61 copy_stat(ubuf, &sbuf); 62 return err; 63 } 64 65 int os_access(const char *file, int mode) 66 { 67 int amode, err; 68 69 amode = (mode & OS_ACC_R_OK ? R_OK : 0) | 70 (mode & OS_ACC_W_OK ? W_OK : 0) | 71 (mode & OS_ACC_X_OK ? X_OK : 0) | 72 (mode & OS_ACC_F_OK ? F_OK : 0); 73 74 err = access(file, amode); 75 if (err < 0) 76 return -errno; 77 78 return 0; 79 } 80 81 /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ 82 int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) 83 { 84 int err; 85 86 err = ioctl(fd, cmd, arg); 87 if (err < 0) 88 return -errno; 89 90 return err; 91 } 92 93 /* FIXME: ensure namebuf in os_get_if_name is big enough */ 94 int os_get_ifname(int fd, char* namebuf) 95 { 96 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0) 97 return -errno; 98 99 return 0; 100 } 101 102 int os_set_slip(int fd) 103 { 104 int disc, sencap; 105 106 disc = N_SLIP; 107 if (ioctl(fd, TIOCSETD, &disc) < 0) 108 return -errno; 109 110 sencap = 0; 111 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0) 112 return -errno; 113 114 return 0; 115 } 116 117 int os_mode_fd(int fd, int mode) 118 { 119 int err; 120 121 CATCH_EINTR(err = fchmod(fd, mode)); 122 if (err < 0) 123 return -errno; 124 125 return 0; 126 } 127 128 int os_file_type(char *file) 129 { 130 struct uml_stat buf; 131 int err; 132 133 err = os_stat_file(file, &buf); 134 if (err < 0) 135 return err; 136 137 if (S_ISDIR(buf.ust_mode)) 138 return OS_TYPE_DIR; 139 else if (S_ISLNK(buf.ust_mode)) 140 return OS_TYPE_SYMLINK; 141 else if (S_ISCHR(buf.ust_mode)) 142 return OS_TYPE_CHARDEV; 143 else if (S_ISBLK(buf.ust_mode)) 144 return OS_TYPE_BLOCKDEV; 145 else if (S_ISFIFO(buf.ust_mode)) 146 return OS_TYPE_FIFO; 147 else if (S_ISSOCK(buf.ust_mode)) 148 return OS_TYPE_SOCK; 149 else return OS_TYPE_FILE; 150 } 151 152 int os_file_mode(const char *file, struct openflags *mode_out) 153 { 154 int err; 155 156 *mode_out = OPENFLAGS(); 157 158 err = access(file, W_OK); 159 if (err && (errno != EACCES)) 160 return -errno; 161 else if (!err) 162 *mode_out = of_write(*mode_out); 163 164 err = access(file, R_OK); 165 if (err && (errno != EACCES)) 166 return -errno; 167 else if (!err) 168 *mode_out = of_read(*mode_out); 169 170 return err; 171 } 172 173 int os_open_file(const char *file, struct openflags flags, int mode) 174 { 175 int fd, err, f = 0; 176 177 if (flags.r && flags.w) 178 f = O_RDWR; 179 else if (flags.r) 180 f = O_RDONLY; 181 else if (flags.w) 182 f = O_WRONLY; 183 else f = 0; 184 185 if (flags.s) 186 f |= O_SYNC; 187 if (flags.c) 188 f |= O_CREAT; 189 if (flags.t) 190 f |= O_TRUNC; 191 if (flags.e) 192 f |= O_EXCL; 193 if (flags.a) 194 f |= O_APPEND; 195 196 fd = open64(file, f, mode); 197 if (fd < 0) 198 return -errno; 199 200 if (flags.cl && fcntl(fd, F_SETFD, 1)) { 201 err = -errno; 202 close(fd); 203 return err; 204 } 205 206 return fd; 207 } 208 209 int os_connect_socket(const char *name) 210 { 211 struct sockaddr_un sock; 212 int fd, err; 213 214 sock.sun_family = AF_UNIX; 215 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 216 217 fd = socket(AF_UNIX, SOCK_STREAM, 0); 218 if (fd < 0) { 219 err = -errno; 220 goto out; 221 } 222 223 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 224 if (err) { 225 err = -errno; 226 goto out_close; 227 } 228 229 return fd; 230 231 out_close: 232 close(fd); 233 out: 234 return err; 235 } 236 237 void os_close_file(int fd) 238 { 239 close(fd); 240 } 241 int os_fsync_file(int fd) 242 { 243 if (fsync(fd) < 0) 244 return -errno; 245 return 0; 246 } 247 248 int os_seek_file(int fd, unsigned long long offset) 249 { 250 unsigned long long actual; 251 252 actual = lseek64(fd, offset, SEEK_SET); 253 if (actual != offset) 254 return -errno; 255 return 0; 256 } 257 258 int os_read_file(int fd, void *buf, int len) 259 { 260 int n = read(fd, buf, len); 261 262 if (n < 0) 263 return -errno; 264 return n; 265 } 266 267 int os_write_file(int fd, const void *buf, int len) 268 { 269 int n = write(fd, (void *) buf, len); 270 271 if (n < 0) 272 return -errno; 273 return n; 274 } 275 276 int os_sync_file(int fd) 277 { 278 int n = fsync(fd); 279 280 if (n < 0) 281 return -errno; 282 return n; 283 } 284 285 int os_file_size(const char *file, unsigned long long *size_out) 286 { 287 struct uml_stat buf; 288 int err; 289 290 err = os_stat_file(file, &buf); 291 if (err < 0) { 292 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 293 -err); 294 return err; 295 } 296 297 if (S_ISBLK(buf.ust_mode)) { 298 int fd; 299 long blocks; 300 301 fd = open(file, O_RDONLY, 0); 302 if (fd < 0) { 303 err = -errno; 304 printk(UM_KERN_ERR "Couldn't open \"%s\", " 305 "errno = %d\n", file, errno); 306 return err; 307 } 308 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) { 309 err = -errno; 310 printk(UM_KERN_ERR "Couldn't get the block size of " 311 "\"%s\", errno = %d\n", file, errno); 312 close(fd); 313 return err; 314 } 315 *size_out = ((long long) blocks) * 512; 316 close(fd); 317 } 318 else *size_out = buf.ust_size; 319 320 return 0; 321 } 322 323 int os_file_modtime(const char *file, unsigned long *modtime) 324 { 325 struct uml_stat buf; 326 int err; 327 328 err = os_stat_file(file, &buf); 329 if (err < 0) { 330 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 331 -err); 332 return err; 333 } 334 335 *modtime = buf.ust_mtime; 336 return 0; 337 } 338 339 int os_set_exec_close(int fd) 340 { 341 int err; 342 343 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); 344 345 if (err < 0) 346 return -errno; 347 return err; 348 } 349 350 int os_pipe(int *fds, int stream, int close_on_exec) 351 { 352 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 353 354 err = socketpair(AF_UNIX, type, 0, fds); 355 if (err < 0) 356 return -errno; 357 358 if (!close_on_exec) 359 return 0; 360 361 err = os_set_exec_close(fds[0]); 362 if (err < 0) 363 goto error; 364 365 err = os_set_exec_close(fds[1]); 366 if (err < 0) 367 goto error; 368 369 return 0; 370 371 error: 372 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n", 373 -err); 374 close(fds[1]); 375 close(fds[0]); 376 return err; 377 } 378 379 int os_set_fd_async(int fd) 380 { 381 int err, flags; 382 383 flags = fcntl(fd, F_GETFL); 384 if (flags < 0) 385 return -errno; 386 387 flags |= O_ASYNC | O_NONBLOCK; 388 if (fcntl(fd, F_SETFL, flags) < 0) { 389 err = -errno; 390 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC " 391 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 392 return err; 393 } 394 395 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) || 396 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) { 397 err = -errno; 398 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN " 399 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno); 400 return err; 401 } 402 403 return 0; 404 } 405 406 int os_clear_fd_async(int fd) 407 { 408 int flags; 409 410 flags = fcntl(fd, F_GETFL); 411 if (flags < 0) 412 return -errno; 413 414 flags &= ~(O_ASYNC | O_NONBLOCK); 415 if (fcntl(fd, F_SETFL, flags) < 0) 416 return -errno; 417 return 0; 418 } 419 420 int os_set_fd_block(int fd, int blocking) 421 { 422 int flags; 423 424 flags = fcntl(fd, F_GETFL); 425 if (flags < 0) 426 return -errno; 427 428 if (blocking) 429 flags &= ~O_NONBLOCK; 430 else 431 flags |= O_NONBLOCK; 432 433 if (fcntl(fd, F_SETFL, flags) < 0) 434 return -errno; 435 436 return 0; 437 } 438 439 int os_accept_connection(int fd) 440 { 441 int new; 442 443 new = accept(fd, NULL, 0); 444 if (new < 0) 445 return -errno; 446 return new; 447 } 448 449 #ifndef SHUT_RD 450 #define SHUT_RD 0 451 #endif 452 453 #ifndef SHUT_WR 454 #define SHUT_WR 1 455 #endif 456 457 #ifndef SHUT_RDWR 458 #define SHUT_RDWR 2 459 #endif 460 461 int os_shutdown_socket(int fd, int r, int w) 462 { 463 int what, err; 464 465 if (r && w) 466 what = SHUT_RDWR; 467 else if (r) 468 what = SHUT_RD; 469 else if (w) 470 what = SHUT_WR; 471 else 472 return -EINVAL; 473 474 err = shutdown(fd, what); 475 if (err < 0) 476 return -errno; 477 return 0; 478 } 479 480 int os_rcv_fd(int fd, int *helper_pid_out) 481 { 482 int new, n; 483 char buf[CMSG_SPACE(sizeof(new))]; 484 struct msghdr msg; 485 struct cmsghdr *cmsg; 486 struct iovec iov; 487 488 msg.msg_name = NULL; 489 msg.msg_namelen = 0; 490 iov = ((struct iovec) { .iov_base = helper_pid_out, 491 .iov_len = sizeof(*helper_pid_out) }); 492 msg.msg_iov = &iov; 493 msg.msg_iovlen = 1; 494 msg.msg_control = buf; 495 msg.msg_controllen = sizeof(buf); 496 msg.msg_flags = 0; 497 498 n = recvmsg(fd, &msg, 0); 499 if (n < 0) 500 return -errno; 501 else if (n != iov.iov_len) 502 *helper_pid_out = -1; 503 504 cmsg = CMSG_FIRSTHDR(&msg); 505 if (cmsg == NULL) { 506 printk(UM_KERN_ERR "rcv_fd didn't receive anything, " 507 "error = %d\n", errno); 508 return -1; 509 } 510 if ((cmsg->cmsg_level != SOL_SOCKET) || 511 (cmsg->cmsg_type != SCM_RIGHTS)) { 512 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n"); 513 return -1; 514 } 515 516 new = ((int *) CMSG_DATA(cmsg))[0]; 517 return new; 518 } 519 520 int os_create_unix_socket(const char *file, int len, int close_on_exec) 521 { 522 struct sockaddr_un addr; 523 int sock, err; 524 525 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 526 if (sock < 0) 527 return -errno; 528 529 if (close_on_exec) { 530 err = os_set_exec_close(sock); 531 if (err < 0) 532 printk(UM_KERN_ERR "create_unix_socket : " 533 "close_on_exec failed, err = %d", -err); 534 } 535 536 addr.sun_family = AF_UNIX; 537 538 snprintf(addr.sun_path, len, "%s", file); 539 540 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 541 if (err < 0) 542 return -errno; 543 544 return sock; 545 } 546 547 void os_flush_stdout(void) 548 { 549 fflush(stdout); 550 } 551 552 int os_lock_file(int fd, int excl) 553 { 554 int type = excl ? F_WRLCK : F_RDLCK; 555 struct flock lock = ((struct flock) { .l_type = type, 556 .l_whence = SEEK_SET, 557 .l_start = 0, 558 .l_len = 0 } ); 559 int err, save; 560 561 err = fcntl(fd, F_SETLK, &lock); 562 if (!err) 563 goto out; 564 565 save = -errno; 566 err = fcntl(fd, F_GETLK, &lock); 567 if (err) { 568 err = -errno; 569 goto out; 570 } 571 572 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n", 573 lock.l_pid); 574 err = save; 575 out: 576 return err; 577 } 578 579 unsigned os_major(unsigned long long dev) 580 { 581 return major(dev); 582 } 583 584 unsigned os_minor(unsigned long long dev) 585 { 586 return minor(dev); 587 } 588 589 unsigned long long os_makedev(unsigned major, unsigned minor) 590 { 591 return makedev(major, minor); 592 } 593