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 } 240 241 int os_seek_file(int fd, unsigned long long offset) 242 { 243 unsigned long long actual; 244 245 actual = lseek64(fd, offset, SEEK_SET); 246 if (actual != offset) 247 return -errno; 248 return 0; 249 } 250 251 int os_read_file(int fd, void *buf, int len) 252 { 253 int n = read(fd, buf, len); 254 255 if (n < 0) 256 return -errno; 257 return n; 258 } 259 260 int os_write_file(int fd, const void *buf, int len) 261 { 262 int n = write(fd, (void *) buf, len); 263 264 if (n < 0) 265 return -errno; 266 return n; 267 } 268 269 int os_sync_file(int fd) 270 { 271 int n = fsync(fd); 272 273 if (n < 0) 274 return -errno; 275 return n; 276 } 277 278 int os_file_size(const char *file, unsigned long long *size_out) 279 { 280 struct uml_stat buf; 281 int err; 282 283 err = os_stat_file(file, &buf); 284 if (err < 0) { 285 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 286 -err); 287 return err; 288 } 289 290 if (S_ISBLK(buf.ust_mode)) { 291 int fd; 292 long blocks; 293 294 fd = open(file, O_RDONLY, 0); 295 if (fd < 0) { 296 err = -errno; 297 printk(UM_KERN_ERR "Couldn't open \"%s\", " 298 "errno = %d\n", file, errno); 299 return err; 300 } 301 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) { 302 err = -errno; 303 printk(UM_KERN_ERR "Couldn't get the block size of " 304 "\"%s\", errno = %d\n", file, errno); 305 close(fd); 306 return err; 307 } 308 *size_out = ((long long) blocks) * 512; 309 close(fd); 310 } 311 else *size_out = buf.ust_size; 312 313 return 0; 314 } 315 316 int os_file_modtime(const char *file, unsigned long *modtime) 317 { 318 struct uml_stat buf; 319 int err; 320 321 err = os_stat_file(file, &buf); 322 if (err < 0) { 323 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 324 -err); 325 return err; 326 } 327 328 *modtime = buf.ust_mtime; 329 return 0; 330 } 331 332 int os_set_exec_close(int fd) 333 { 334 int err; 335 336 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); 337 338 if (err < 0) 339 return -errno; 340 return err; 341 } 342 343 int os_pipe(int *fds, int stream, int close_on_exec) 344 { 345 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 346 347 err = socketpair(AF_UNIX, type, 0, fds); 348 if (err < 0) 349 return -errno; 350 351 if (!close_on_exec) 352 return 0; 353 354 err = os_set_exec_close(fds[0]); 355 if (err < 0) 356 goto error; 357 358 err = os_set_exec_close(fds[1]); 359 if (err < 0) 360 goto error; 361 362 return 0; 363 364 error: 365 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n", 366 -err); 367 close(fds[1]); 368 close(fds[0]); 369 return err; 370 } 371 372 int os_set_fd_async(int fd) 373 { 374 int err, flags; 375 376 flags = fcntl(fd, F_GETFL); 377 if (flags < 0) 378 return -errno; 379 380 flags |= O_ASYNC | O_NONBLOCK; 381 if (fcntl(fd, F_SETFL, flags) < 0) { 382 err = -errno; 383 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC " 384 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 385 return err; 386 } 387 388 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) || 389 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) { 390 err = -errno; 391 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN " 392 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno); 393 return err; 394 } 395 396 return 0; 397 } 398 399 int os_clear_fd_async(int fd) 400 { 401 int 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 return -errno; 410 return 0; 411 } 412 413 int os_set_fd_block(int fd, int blocking) 414 { 415 int flags; 416 417 flags = fcntl(fd, F_GETFL); 418 if (flags < 0) 419 return -errno; 420 421 if (blocking) 422 flags &= ~O_NONBLOCK; 423 else 424 flags |= O_NONBLOCK; 425 426 if (fcntl(fd, F_SETFL, flags) < 0) 427 return -errno; 428 429 return 0; 430 } 431 432 int os_accept_connection(int fd) 433 { 434 int new; 435 436 new = accept(fd, NULL, 0); 437 if (new < 0) 438 return -errno; 439 return new; 440 } 441 442 #ifndef SHUT_RD 443 #define SHUT_RD 0 444 #endif 445 446 #ifndef SHUT_WR 447 #define SHUT_WR 1 448 #endif 449 450 #ifndef SHUT_RDWR 451 #define SHUT_RDWR 2 452 #endif 453 454 int os_shutdown_socket(int fd, int r, int w) 455 { 456 int what, err; 457 458 if (r && w) 459 what = SHUT_RDWR; 460 else if (r) 461 what = SHUT_RD; 462 else if (w) 463 what = SHUT_WR; 464 else 465 return -EINVAL; 466 467 err = shutdown(fd, what); 468 if (err < 0) 469 return -errno; 470 return 0; 471 } 472 473 int os_rcv_fd(int fd, int *helper_pid_out) 474 { 475 int new, n; 476 char buf[CMSG_SPACE(sizeof(new))]; 477 struct msghdr msg; 478 struct cmsghdr *cmsg; 479 struct iovec iov; 480 481 msg.msg_name = NULL; 482 msg.msg_namelen = 0; 483 iov = ((struct iovec) { .iov_base = helper_pid_out, 484 .iov_len = sizeof(*helper_pid_out) }); 485 msg.msg_iov = &iov; 486 msg.msg_iovlen = 1; 487 msg.msg_control = buf; 488 msg.msg_controllen = sizeof(buf); 489 msg.msg_flags = 0; 490 491 n = recvmsg(fd, &msg, 0); 492 if (n < 0) 493 return -errno; 494 else if (n != iov.iov_len) 495 *helper_pid_out = -1; 496 497 cmsg = CMSG_FIRSTHDR(&msg); 498 if (cmsg == NULL) { 499 printk(UM_KERN_ERR "rcv_fd didn't receive anything, " 500 "error = %d\n", errno); 501 return -1; 502 } 503 if ((cmsg->cmsg_level != SOL_SOCKET) || 504 (cmsg->cmsg_type != SCM_RIGHTS)) { 505 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n"); 506 return -1; 507 } 508 509 new = ((int *) CMSG_DATA(cmsg))[0]; 510 return new; 511 } 512 513 int os_create_unix_socket(const char *file, int len, int close_on_exec) 514 { 515 struct sockaddr_un addr; 516 int sock, err; 517 518 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 519 if (sock < 0) 520 return -errno; 521 522 if (close_on_exec) { 523 err = os_set_exec_close(sock); 524 if (err < 0) 525 printk(UM_KERN_ERR "create_unix_socket : " 526 "close_on_exec failed, err = %d", -err); 527 } 528 529 addr.sun_family = AF_UNIX; 530 531 snprintf(addr.sun_path, len, "%s", file); 532 533 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 534 if (err < 0) 535 return -errno; 536 537 return sock; 538 } 539 540 void os_flush_stdout(void) 541 { 542 fflush(stdout); 543 } 544 545 int os_lock_file(int fd, int excl) 546 { 547 int type = excl ? F_WRLCK : F_RDLCK; 548 struct flock lock = ((struct flock) { .l_type = type, 549 .l_whence = SEEK_SET, 550 .l_start = 0, 551 .l_len = 0 } ); 552 int err, save; 553 554 err = fcntl(fd, F_SETLK, &lock); 555 if (!err) 556 goto out; 557 558 save = -errno; 559 err = fcntl(fd, F_GETLK, &lock); 560 if (err) { 561 err = -errno; 562 goto out; 563 } 564 565 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n", 566 lock.l_pid); 567 err = save; 568 out: 569 return err; 570 } 571 572 unsigned os_major(unsigned long long dev) 573 { 574 return major(dev); 575 } 576 577 unsigned os_minor(unsigned long long dev) 578 { 579 return minor(dev); 580 } 581 582 unsigned long long os_makedev(unsigned major, unsigned minor) 583 { 584 return makedev(major, minor); 585 } 586