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 "kern_constants.h" 17 #include "os.h" 18 #include "user.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 } 242 243 int os_seek_file(int fd, unsigned long long offset) 244 { 245 unsigned long long actual; 246 247 actual = lseek64(fd, offset, SEEK_SET); 248 if (actual != offset) 249 return -errno; 250 return 0; 251 } 252 253 int os_read_file(int fd, void *buf, int len) 254 { 255 int n = read(fd, buf, len); 256 257 if (n < 0) 258 return -errno; 259 return n; 260 } 261 262 int os_write_file(int fd, const void *buf, int len) 263 { 264 int n = write(fd, (void *) buf, len); 265 266 if (n < 0) 267 return -errno; 268 return n; 269 } 270 271 int os_file_size(const char *file, unsigned long long *size_out) 272 { 273 struct uml_stat buf; 274 int err; 275 276 err = os_stat_file(file, &buf); 277 if (err < 0) { 278 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 279 -err); 280 return err; 281 } 282 283 if (S_ISBLK(buf.ust_mode)) { 284 int fd; 285 long blocks; 286 287 fd = open(file, O_RDONLY, 0); 288 if (fd < 0) { 289 err = -errno; 290 printk(UM_KERN_ERR "Couldn't open \"%s\", " 291 "errno = %d\n", file, errno); 292 return err; 293 } 294 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) { 295 err = -errno; 296 printk(UM_KERN_ERR "Couldn't get the block size of " 297 "\"%s\", errno = %d\n", file, errno); 298 close(fd); 299 return err; 300 } 301 *size_out = ((long long) blocks) * 512; 302 close(fd); 303 } 304 else *size_out = buf.ust_size; 305 306 return 0; 307 } 308 309 int os_file_modtime(const char *file, unsigned long *modtime) 310 { 311 struct uml_stat buf; 312 int err; 313 314 err = os_stat_file(file, &buf); 315 if (err < 0) { 316 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 317 -err); 318 return err; 319 } 320 321 *modtime = buf.ust_mtime; 322 return 0; 323 } 324 325 int os_set_exec_close(int fd) 326 { 327 int err; 328 329 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); 330 331 if (err < 0) 332 return -errno; 333 return err; 334 } 335 336 int os_pipe(int *fds, int stream, int close_on_exec) 337 { 338 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 339 340 err = socketpair(AF_UNIX, type, 0, fds); 341 if (err < 0) 342 return -errno; 343 344 if (!close_on_exec) 345 return 0; 346 347 err = os_set_exec_close(fds[0]); 348 if (err < 0) 349 goto error; 350 351 err = os_set_exec_close(fds[1]); 352 if (err < 0) 353 goto error; 354 355 return 0; 356 357 error: 358 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n", 359 -err); 360 close(fds[1]); 361 close(fds[0]); 362 return err; 363 } 364 365 int os_set_fd_async(int fd) 366 { 367 int err, flags; 368 369 flags = fcntl(fd, F_GETFL); 370 if (flags < 0) 371 return -errno; 372 373 flags |= O_ASYNC | O_NONBLOCK; 374 if (fcntl(fd, F_SETFL, flags) < 0) { 375 err = -errno; 376 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC " 377 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 378 return err; 379 } 380 381 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) || 382 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) { 383 err = -errno; 384 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN " 385 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno); 386 return err; 387 } 388 389 return 0; 390 } 391 392 int os_clear_fd_async(int fd) 393 { 394 int flags; 395 396 flags = fcntl(fd, F_GETFL); 397 if (flags < 0) 398 return -errno; 399 400 flags &= ~(O_ASYNC | O_NONBLOCK); 401 if (fcntl(fd, F_SETFL, flags) < 0) 402 return -errno; 403 return 0; 404 } 405 406 int os_set_fd_block(int fd, int blocking) 407 { 408 int flags; 409 410 flags = fcntl(fd, F_GETFL); 411 if (flags < 0) 412 return -errno; 413 414 if (blocking) 415 flags &= ~O_NONBLOCK; 416 else 417 flags |= O_NONBLOCK; 418 419 if (fcntl(fd, F_SETFL, flags) < 0) 420 return -errno; 421 422 return 0; 423 } 424 425 int os_accept_connection(int fd) 426 { 427 int new; 428 429 new = accept(fd, NULL, 0); 430 if (new < 0) 431 return -errno; 432 return new; 433 } 434 435 #ifndef SHUT_RD 436 #define SHUT_RD 0 437 #endif 438 439 #ifndef SHUT_WR 440 #define SHUT_WR 1 441 #endif 442 443 #ifndef SHUT_RDWR 444 #define SHUT_RDWR 2 445 #endif 446 447 int os_shutdown_socket(int fd, int r, int w) 448 { 449 int what, err; 450 451 if (r && w) 452 what = SHUT_RDWR; 453 else if (r) 454 what = SHUT_RD; 455 else if (w) 456 what = SHUT_WR; 457 else 458 return -EINVAL; 459 460 err = shutdown(fd, what); 461 if (err < 0) 462 return -errno; 463 return 0; 464 } 465 466 int os_rcv_fd(int fd, int *helper_pid_out) 467 { 468 int new, n; 469 char buf[CMSG_SPACE(sizeof(new))]; 470 struct msghdr msg; 471 struct cmsghdr *cmsg; 472 struct iovec iov; 473 474 msg.msg_name = NULL; 475 msg.msg_namelen = 0; 476 iov = ((struct iovec) { .iov_base = helper_pid_out, 477 .iov_len = sizeof(*helper_pid_out) }); 478 msg.msg_iov = &iov; 479 msg.msg_iovlen = 1; 480 msg.msg_control = buf; 481 msg.msg_controllen = sizeof(buf); 482 msg.msg_flags = 0; 483 484 n = recvmsg(fd, &msg, 0); 485 if (n < 0) 486 return -errno; 487 else if (n != iov.iov_len) 488 *helper_pid_out = -1; 489 490 cmsg = CMSG_FIRSTHDR(&msg); 491 if (cmsg == NULL) { 492 printk(UM_KERN_ERR "rcv_fd didn't receive anything, " 493 "error = %d\n", errno); 494 return -1; 495 } 496 if ((cmsg->cmsg_level != SOL_SOCKET) || 497 (cmsg->cmsg_type != SCM_RIGHTS)) { 498 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n"); 499 return -1; 500 } 501 502 new = ((int *) CMSG_DATA(cmsg))[0]; 503 return new; 504 } 505 506 int os_create_unix_socket(const char *file, int len, int close_on_exec) 507 { 508 struct sockaddr_un addr; 509 int sock, err; 510 511 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 512 if (sock < 0) 513 return -errno; 514 515 if (close_on_exec) { 516 err = os_set_exec_close(sock); 517 if (err < 0) 518 printk(UM_KERN_ERR "create_unix_socket : " 519 "close_on_exec failed, err = %d", -err); 520 } 521 522 addr.sun_family = AF_UNIX; 523 524 snprintf(addr.sun_path, len, "%s", file); 525 526 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 527 if (err < 0) 528 return -errno; 529 530 return sock; 531 } 532 533 void os_flush_stdout(void) 534 { 535 fflush(stdout); 536 } 537 538 int os_lock_file(int fd, int excl) 539 { 540 int type = excl ? F_WRLCK : F_RDLCK; 541 struct flock lock = ((struct flock) { .l_type = type, 542 .l_whence = SEEK_SET, 543 .l_start = 0, 544 .l_len = 0 } ); 545 int err, save; 546 547 err = fcntl(fd, F_SETLK, &lock); 548 if (!err) 549 goto out; 550 551 save = -errno; 552 err = fcntl(fd, F_GETLK, &lock); 553 if (err) { 554 err = -errno; 555 goto out; 556 } 557 558 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n", 559 lock.l_pid); 560 err = save; 561 out: 562 return err; 563 } 564 565 unsigned os_major(unsigned long long dev) 566 { 567 return major(dev); 568 } 569 570 unsigned os_minor(unsigned long long dev) 571 { 572 return minor(dev); 573 } 574 575 unsigned long long os_makedev(unsigned major, unsigned minor) 576 { 577 return makedev(major, minor); 578 } 579