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/sysmacros.h> 16 #include <sys/un.h> 17 #include <sys/types.h> 18 #include <os.h> 19 20 static void copy_stat(struct uml_stat *dst, const struct stat64 *src) 21 { 22 *dst = ((struct uml_stat) { 23 .ust_dev = src->st_dev, /* device */ 24 .ust_ino = src->st_ino, /* inode */ 25 .ust_mode = src->st_mode, /* protection */ 26 .ust_nlink = src->st_nlink, /* number of hard links */ 27 .ust_uid = src->st_uid, /* user ID of owner */ 28 .ust_gid = src->st_gid, /* group ID of owner */ 29 .ust_size = src->st_size, /* total size, in bytes */ 30 .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */ 31 .ust_blocks = src->st_blocks, /* number of blocks allocated */ 32 .ust_atime = src->st_atime, /* time of last access */ 33 .ust_mtime = src->st_mtime, /* time of last modification */ 34 .ust_ctime = src->st_ctime, /* time of last change */ 35 }); 36 } 37 38 int os_stat_fd(const int fd, struct uml_stat *ubuf) 39 { 40 struct stat64 sbuf; 41 int err; 42 43 CATCH_EINTR(err = fstat64(fd, &sbuf)); 44 if (err < 0) 45 return -errno; 46 47 if (ubuf != NULL) 48 copy_stat(ubuf, &sbuf); 49 return err; 50 } 51 52 int os_stat_file(const char *file_name, struct uml_stat *ubuf) 53 { 54 struct stat64 sbuf; 55 int err; 56 57 CATCH_EINTR(err = stat64(file_name, &sbuf)); 58 if (err < 0) 59 return -errno; 60 61 if (ubuf != NULL) 62 copy_stat(ubuf, &sbuf); 63 return err; 64 } 65 66 int os_access(const char *file, int mode) 67 { 68 int amode, err; 69 70 amode = (mode & OS_ACC_R_OK ? R_OK : 0) | 71 (mode & OS_ACC_W_OK ? W_OK : 0) | 72 (mode & OS_ACC_X_OK ? X_OK : 0) | 73 (mode & OS_ACC_F_OK ? F_OK : 0); 74 75 err = access(file, amode); 76 if (err < 0) 77 return -errno; 78 79 return 0; 80 } 81 82 /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ 83 int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) 84 { 85 int err; 86 87 err = ioctl(fd, cmd, arg); 88 if (err < 0) 89 return -errno; 90 91 return err; 92 } 93 94 /* FIXME: ensure namebuf in os_get_if_name is big enough */ 95 int os_get_ifname(int fd, char* namebuf) 96 { 97 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0) 98 return -errno; 99 100 return 0; 101 } 102 103 int os_set_slip(int fd) 104 { 105 int disc, sencap; 106 107 disc = N_SLIP; 108 if (ioctl(fd, TIOCSETD, &disc) < 0) 109 return -errno; 110 111 sencap = 0; 112 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0) 113 return -errno; 114 115 return 0; 116 } 117 118 int os_mode_fd(int fd, int mode) 119 { 120 int err; 121 122 CATCH_EINTR(err = fchmod(fd, mode)); 123 if (err < 0) 124 return -errno; 125 126 return 0; 127 } 128 129 int os_file_type(char *file) 130 { 131 struct uml_stat buf; 132 int err; 133 134 err = os_stat_file(file, &buf); 135 if (err < 0) 136 return err; 137 138 if (S_ISDIR(buf.ust_mode)) 139 return OS_TYPE_DIR; 140 else if (S_ISLNK(buf.ust_mode)) 141 return OS_TYPE_SYMLINK; 142 else if (S_ISCHR(buf.ust_mode)) 143 return OS_TYPE_CHARDEV; 144 else if (S_ISBLK(buf.ust_mode)) 145 return OS_TYPE_BLOCKDEV; 146 else if (S_ISFIFO(buf.ust_mode)) 147 return OS_TYPE_FIFO; 148 else if (S_ISSOCK(buf.ust_mode)) 149 return OS_TYPE_SOCK; 150 else return OS_TYPE_FILE; 151 } 152 153 int os_file_mode(const char *file, struct openflags *mode_out) 154 { 155 int err; 156 157 *mode_out = OPENFLAGS(); 158 159 err = access(file, W_OK); 160 if (err && (errno != EACCES)) 161 return -errno; 162 else if (!err) 163 *mode_out = of_write(*mode_out); 164 165 err = access(file, R_OK); 166 if (err && (errno != EACCES)) 167 return -errno; 168 else if (!err) 169 *mode_out = of_read(*mode_out); 170 171 return err; 172 } 173 174 int os_open_file(const char *file, struct openflags flags, int mode) 175 { 176 int fd, err, f = 0; 177 178 if (flags.r && flags.w) 179 f = O_RDWR; 180 else if (flags.r) 181 f = O_RDONLY; 182 else if (flags.w) 183 f = O_WRONLY; 184 else f = 0; 185 186 if (flags.s) 187 f |= O_SYNC; 188 if (flags.c) 189 f |= O_CREAT; 190 if (flags.t) 191 f |= O_TRUNC; 192 if (flags.e) 193 f |= O_EXCL; 194 if (flags.a) 195 f |= O_APPEND; 196 197 fd = open64(file, f, mode); 198 if (fd < 0) 199 return -errno; 200 201 if (flags.cl && fcntl(fd, F_SETFD, 1)) { 202 err = -errno; 203 close(fd); 204 return err; 205 } 206 207 return fd; 208 } 209 210 int os_connect_socket(const char *name) 211 { 212 struct sockaddr_un sock; 213 int fd, err; 214 215 sock.sun_family = AF_UNIX; 216 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 217 218 fd = socket(AF_UNIX, SOCK_STREAM, 0); 219 if (fd < 0) { 220 err = -errno; 221 goto out; 222 } 223 224 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 225 if (err) { 226 err = -errno; 227 goto out_close; 228 } 229 230 return fd; 231 232 out_close: 233 close(fd); 234 out: 235 return err; 236 } 237 238 void os_close_file(int fd) 239 { 240 close(fd); 241 } 242 int os_fsync_file(int fd) 243 { 244 if (fsync(fd) < 0) 245 return -errno; 246 return 0; 247 } 248 249 int os_seek_file(int fd, unsigned long long offset) 250 { 251 unsigned long long actual; 252 253 actual = lseek64(fd, offset, SEEK_SET); 254 if (actual != offset) 255 return -errno; 256 return 0; 257 } 258 259 int os_read_file(int fd, void *buf, int len) 260 { 261 int n = read(fd, buf, len); 262 263 if (n < 0) 264 return -errno; 265 return n; 266 } 267 268 int os_pread_file(int fd, void *buf, int len, unsigned long long offset) 269 { 270 int n = pread(fd, buf, len, offset); 271 272 if (n < 0) 273 return -errno; 274 return n; 275 } 276 277 int os_write_file(int fd, const void *buf, int len) 278 { 279 int n = write(fd, (void *) buf, len); 280 281 if (n < 0) 282 return -errno; 283 return n; 284 } 285 286 int os_sync_file(int fd) 287 { 288 int n = fsync(fd); 289 290 if (n < 0) 291 return -errno; 292 return n; 293 } 294 295 int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset) 296 { 297 int n = pwrite(fd, (void *) buf, len, offset); 298 299 if (n < 0) 300 return -errno; 301 return n; 302 } 303 304 305 int os_file_size(const char *file, unsigned long long *size_out) 306 { 307 struct uml_stat buf; 308 int err; 309 310 err = os_stat_file(file, &buf); 311 if (err < 0) { 312 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 313 -err); 314 return err; 315 } 316 317 if (S_ISBLK(buf.ust_mode)) { 318 int fd; 319 long blocks; 320 321 fd = open(file, O_RDONLY, 0); 322 if (fd < 0) { 323 err = -errno; 324 printk(UM_KERN_ERR "Couldn't open \"%s\", " 325 "errno = %d\n", file, errno); 326 return err; 327 } 328 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) { 329 err = -errno; 330 printk(UM_KERN_ERR "Couldn't get the block size of " 331 "\"%s\", errno = %d\n", file, errno); 332 close(fd); 333 return err; 334 } 335 *size_out = ((long long) blocks) * 512; 336 close(fd); 337 } 338 else *size_out = buf.ust_size; 339 340 return 0; 341 } 342 343 int os_file_modtime(const char *file, unsigned long *modtime) 344 { 345 struct uml_stat buf; 346 int err; 347 348 err = os_stat_file(file, &buf); 349 if (err < 0) { 350 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 351 -err); 352 return err; 353 } 354 355 *modtime = buf.ust_mtime; 356 return 0; 357 } 358 359 int os_set_exec_close(int fd) 360 { 361 int err; 362 363 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); 364 365 if (err < 0) 366 return -errno; 367 return err; 368 } 369 370 int os_pipe(int *fds, int stream, int close_on_exec) 371 { 372 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 373 374 err = socketpair(AF_UNIX, type, 0, fds); 375 if (err < 0) 376 return -errno; 377 378 if (!close_on_exec) 379 return 0; 380 381 err = os_set_exec_close(fds[0]); 382 if (err < 0) 383 goto error; 384 385 err = os_set_exec_close(fds[1]); 386 if (err < 0) 387 goto error; 388 389 return 0; 390 391 error: 392 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n", 393 -err); 394 close(fds[1]); 395 close(fds[0]); 396 return err; 397 } 398 399 int os_set_fd_async(int fd) 400 { 401 int err, flags; 402 403 flags = fcntl(fd, F_GETFL); 404 if (flags < 0) 405 return -errno; 406 407 flags |= O_ASYNC | O_NONBLOCK; 408 if (fcntl(fd, F_SETFL, flags) < 0) { 409 err = -errno; 410 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC " 411 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 412 return err; 413 } 414 415 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) || 416 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) { 417 err = -errno; 418 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN " 419 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno); 420 return err; 421 } 422 423 return 0; 424 } 425 426 int os_clear_fd_async(int fd) 427 { 428 int flags; 429 430 flags = fcntl(fd, F_GETFL); 431 if (flags < 0) 432 return -errno; 433 434 flags &= ~(O_ASYNC | O_NONBLOCK); 435 if (fcntl(fd, F_SETFL, flags) < 0) 436 return -errno; 437 return 0; 438 } 439 440 int os_set_fd_block(int fd, int blocking) 441 { 442 int flags; 443 444 flags = fcntl(fd, F_GETFL); 445 if (flags < 0) 446 return -errno; 447 448 if (blocking) 449 flags &= ~O_NONBLOCK; 450 else 451 flags |= O_NONBLOCK; 452 453 if (fcntl(fd, F_SETFL, flags) < 0) 454 return -errno; 455 456 return 0; 457 } 458 459 int os_accept_connection(int fd) 460 { 461 int new; 462 463 new = accept(fd, NULL, 0); 464 if (new < 0) 465 return -errno; 466 return new; 467 } 468 469 #ifndef SHUT_RD 470 #define SHUT_RD 0 471 #endif 472 473 #ifndef SHUT_WR 474 #define SHUT_WR 1 475 #endif 476 477 #ifndef SHUT_RDWR 478 #define SHUT_RDWR 2 479 #endif 480 481 int os_shutdown_socket(int fd, int r, int w) 482 { 483 int what, err; 484 485 if (r && w) 486 what = SHUT_RDWR; 487 else if (r) 488 what = SHUT_RD; 489 else if (w) 490 what = SHUT_WR; 491 else 492 return -EINVAL; 493 494 err = shutdown(fd, what); 495 if (err < 0) 496 return -errno; 497 return 0; 498 } 499 500 int os_rcv_fd(int fd, int *helper_pid_out) 501 { 502 int new, n; 503 char buf[CMSG_SPACE(sizeof(new))]; 504 struct msghdr msg; 505 struct cmsghdr *cmsg; 506 struct iovec iov; 507 508 msg.msg_name = NULL; 509 msg.msg_namelen = 0; 510 iov = ((struct iovec) { .iov_base = helper_pid_out, 511 .iov_len = sizeof(*helper_pid_out) }); 512 msg.msg_iov = &iov; 513 msg.msg_iovlen = 1; 514 msg.msg_control = buf; 515 msg.msg_controllen = sizeof(buf); 516 msg.msg_flags = 0; 517 518 n = recvmsg(fd, &msg, 0); 519 if (n < 0) 520 return -errno; 521 else if (n != iov.iov_len) 522 *helper_pid_out = -1; 523 524 cmsg = CMSG_FIRSTHDR(&msg); 525 if (cmsg == NULL) { 526 printk(UM_KERN_ERR "rcv_fd didn't receive anything, " 527 "error = %d\n", errno); 528 return -1; 529 } 530 if ((cmsg->cmsg_level != SOL_SOCKET) || 531 (cmsg->cmsg_type != SCM_RIGHTS)) { 532 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n"); 533 return -1; 534 } 535 536 new = ((int *) CMSG_DATA(cmsg))[0]; 537 return new; 538 } 539 540 int os_create_unix_socket(const char *file, int len, int close_on_exec) 541 { 542 struct sockaddr_un addr; 543 int sock, err; 544 545 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 546 if (sock < 0) 547 return -errno; 548 549 if (close_on_exec) { 550 err = os_set_exec_close(sock); 551 if (err < 0) 552 printk(UM_KERN_ERR "create_unix_socket : " 553 "close_on_exec failed, err = %d", -err); 554 } 555 556 addr.sun_family = AF_UNIX; 557 558 snprintf(addr.sun_path, len, "%s", file); 559 560 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 561 if (err < 0) 562 return -errno; 563 564 return sock; 565 } 566 567 void os_flush_stdout(void) 568 { 569 fflush(stdout); 570 } 571 572 int os_lock_file(int fd, int excl) 573 { 574 int type = excl ? F_WRLCK : F_RDLCK; 575 struct flock lock = ((struct flock) { .l_type = type, 576 .l_whence = SEEK_SET, 577 .l_start = 0, 578 .l_len = 0 } ); 579 int err, save; 580 581 err = fcntl(fd, F_SETLK, &lock); 582 if (!err) 583 goto out; 584 585 save = -errno; 586 err = fcntl(fd, F_GETLK, &lock); 587 if (err) { 588 err = -errno; 589 goto out; 590 } 591 592 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n", 593 lock.l_pid); 594 err = save; 595 out: 596 return err; 597 } 598 599 unsigned os_major(unsigned long long dev) 600 { 601 return major(dev); 602 } 603 604 unsigned os_minor(unsigned long long dev) 605 { 606 return minor(dev); 607 } 608 609 unsigned long long os_makedev(unsigned major, unsigned minor) 610 { 611 return makedev(major, minor); 612 } 613 614 int os_falloc_punch(int fd, unsigned long long offset, int len) 615 { 616 int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len); 617 618 if (n < 0) 619 return -errno; 620 return n; 621 } 622 623