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