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_pread_file(int fd, void *buf, int len, unsigned long long offset) 268 { 269 int n = pread(fd, buf, len, offset); 270 271 if (n < 0) 272 return -errno; 273 return n; 274 } 275 276 int os_write_file(int fd, const void *buf, int len) 277 { 278 int n = write(fd, (void *) buf, len); 279 280 if (n < 0) 281 return -errno; 282 return n; 283 } 284 285 int os_sync_file(int fd) 286 { 287 int n = fsync(fd); 288 289 if (n < 0) 290 return -errno; 291 return n; 292 } 293 294 int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset) 295 { 296 int n = pwrite(fd, (void *) buf, len, offset); 297 298 if (n < 0) 299 return -errno; 300 return n; 301 } 302 303 304 int os_file_size(const char *file, unsigned long long *size_out) 305 { 306 struct uml_stat buf; 307 int err; 308 309 err = os_stat_file(file, &buf); 310 if (err < 0) { 311 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 312 -err); 313 return err; 314 } 315 316 if (S_ISBLK(buf.ust_mode)) { 317 int fd; 318 long blocks; 319 320 fd = open(file, O_RDONLY, 0); 321 if (fd < 0) { 322 err = -errno; 323 printk(UM_KERN_ERR "Couldn't open \"%s\", " 324 "errno = %d\n", file, errno); 325 return err; 326 } 327 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) { 328 err = -errno; 329 printk(UM_KERN_ERR "Couldn't get the block size of " 330 "\"%s\", errno = %d\n", file, errno); 331 close(fd); 332 return err; 333 } 334 *size_out = ((long long) blocks) * 512; 335 close(fd); 336 } 337 else *size_out = buf.ust_size; 338 339 return 0; 340 } 341 342 int os_file_modtime(const char *file, unsigned long *modtime) 343 { 344 struct uml_stat buf; 345 int err; 346 347 err = os_stat_file(file, &buf); 348 if (err < 0) { 349 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 350 -err); 351 return err; 352 } 353 354 *modtime = buf.ust_mtime; 355 return 0; 356 } 357 358 int os_set_exec_close(int fd) 359 { 360 int err; 361 362 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); 363 364 if (err < 0) 365 return -errno; 366 return err; 367 } 368 369 int os_pipe(int *fds, int stream, int close_on_exec) 370 { 371 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 372 373 err = socketpair(AF_UNIX, type, 0, fds); 374 if (err < 0) 375 return -errno; 376 377 if (!close_on_exec) 378 return 0; 379 380 err = os_set_exec_close(fds[0]); 381 if (err < 0) 382 goto error; 383 384 err = os_set_exec_close(fds[1]); 385 if (err < 0) 386 goto error; 387 388 return 0; 389 390 error: 391 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n", 392 -err); 393 close(fds[1]); 394 close(fds[0]); 395 return err; 396 } 397 398 int os_set_fd_async(int fd) 399 { 400 int err, flags; 401 402 flags = fcntl(fd, F_GETFL); 403 if (flags < 0) 404 return -errno; 405 406 flags |= O_ASYNC | O_NONBLOCK; 407 if (fcntl(fd, F_SETFL, flags) < 0) { 408 err = -errno; 409 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC " 410 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 411 return err; 412 } 413 414 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) || 415 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) { 416 err = -errno; 417 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN " 418 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno); 419 return err; 420 } 421 422 return 0; 423 } 424 425 int os_clear_fd_async(int fd) 426 { 427 int flags; 428 429 flags = fcntl(fd, F_GETFL); 430 if (flags < 0) 431 return -errno; 432 433 flags &= ~(O_ASYNC | O_NONBLOCK); 434 if (fcntl(fd, F_SETFL, flags) < 0) 435 return -errno; 436 return 0; 437 } 438 439 int os_set_fd_block(int fd, int blocking) 440 { 441 int flags; 442 443 flags = fcntl(fd, F_GETFL); 444 if (flags < 0) 445 return -errno; 446 447 if (blocking) 448 flags &= ~O_NONBLOCK; 449 else 450 flags |= O_NONBLOCK; 451 452 if (fcntl(fd, F_SETFL, flags) < 0) 453 return -errno; 454 455 return 0; 456 } 457 458 int os_accept_connection(int fd) 459 { 460 int new; 461 462 new = accept(fd, NULL, 0); 463 if (new < 0) 464 return -errno; 465 return new; 466 } 467 468 #ifndef SHUT_RD 469 #define SHUT_RD 0 470 #endif 471 472 #ifndef SHUT_WR 473 #define SHUT_WR 1 474 #endif 475 476 #ifndef SHUT_RDWR 477 #define SHUT_RDWR 2 478 #endif 479 480 int os_shutdown_socket(int fd, int r, int w) 481 { 482 int what, err; 483 484 if (r && w) 485 what = SHUT_RDWR; 486 else if (r) 487 what = SHUT_RD; 488 else if (w) 489 what = SHUT_WR; 490 else 491 return -EINVAL; 492 493 err = shutdown(fd, what); 494 if (err < 0) 495 return -errno; 496 return 0; 497 } 498 499 int os_rcv_fd(int fd, int *helper_pid_out) 500 { 501 int new, n; 502 char buf[CMSG_SPACE(sizeof(new))]; 503 struct msghdr msg; 504 struct cmsghdr *cmsg; 505 struct iovec iov; 506 507 msg.msg_name = NULL; 508 msg.msg_namelen = 0; 509 iov = ((struct iovec) { .iov_base = helper_pid_out, 510 .iov_len = sizeof(*helper_pid_out) }); 511 msg.msg_iov = &iov; 512 msg.msg_iovlen = 1; 513 msg.msg_control = buf; 514 msg.msg_controllen = sizeof(buf); 515 msg.msg_flags = 0; 516 517 n = recvmsg(fd, &msg, 0); 518 if (n < 0) 519 return -errno; 520 else if (n != iov.iov_len) 521 *helper_pid_out = -1; 522 523 cmsg = CMSG_FIRSTHDR(&msg); 524 if (cmsg == NULL) { 525 printk(UM_KERN_ERR "rcv_fd didn't receive anything, " 526 "error = %d\n", errno); 527 return -1; 528 } 529 if ((cmsg->cmsg_level != SOL_SOCKET) || 530 (cmsg->cmsg_type != SCM_RIGHTS)) { 531 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n"); 532 return -1; 533 } 534 535 new = ((int *) CMSG_DATA(cmsg))[0]; 536 return new; 537 } 538 539 int os_create_unix_socket(const char *file, int len, int close_on_exec) 540 { 541 struct sockaddr_un addr; 542 int sock, err; 543 544 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 545 if (sock < 0) 546 return -errno; 547 548 if (close_on_exec) { 549 err = os_set_exec_close(sock); 550 if (err < 0) 551 printk(UM_KERN_ERR "create_unix_socket : " 552 "close_on_exec failed, err = %d", -err); 553 } 554 555 addr.sun_family = AF_UNIX; 556 557 snprintf(addr.sun_path, len, "%s", file); 558 559 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 560 if (err < 0) 561 return -errno; 562 563 return sock; 564 } 565 566 void os_flush_stdout(void) 567 { 568 fflush(stdout); 569 } 570 571 int os_lock_file(int fd, int excl) 572 { 573 int type = excl ? F_WRLCK : F_RDLCK; 574 struct flock lock = ((struct flock) { .l_type = type, 575 .l_whence = SEEK_SET, 576 .l_start = 0, 577 .l_len = 0 } ); 578 int err, save; 579 580 err = fcntl(fd, F_SETLK, &lock); 581 if (!err) 582 goto out; 583 584 save = -errno; 585 err = fcntl(fd, F_GETLK, &lock); 586 if (err) { 587 err = -errno; 588 goto out; 589 } 590 591 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n", 592 lock.l_pid); 593 err = save; 594 out: 595 return err; 596 } 597 598 unsigned os_major(unsigned long long dev) 599 { 600 return major(dev); 601 } 602 603 unsigned os_minor(unsigned long long dev) 604 { 605 return minor(dev); 606 } 607 608 unsigned long long os_makedev(unsigned major, unsigned minor) 609 { 610 return makedev(major, minor); 611 } 612