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