1 /* 2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.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/types.h> 12 #include <sys/stat.h> 13 #include <sys/socket.h> 14 #include <sys/un.h> 15 #include <sys/ioctl.h> 16 #include <sys/mount.h> 17 #include <sys/uio.h> 18 #include "os.h" 19 #include "user.h" 20 #include "kern_util.h" 21 22 static void copy_stat(struct uml_stat *dst, struct stat64 *src) 23 { 24 *dst = ((struct uml_stat) { 25 .ust_dev = src->st_dev, /* device */ 26 .ust_ino = src->st_ino, /* inode */ 27 .ust_mode = src->st_mode, /* protection */ 28 .ust_nlink = src->st_nlink, /* number of hard links */ 29 .ust_uid = src->st_uid, /* user ID of owner */ 30 .ust_gid = src->st_gid, /* group ID of owner */ 31 .ust_size = src->st_size, /* total size, in bytes */ 32 .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */ 33 .ust_blocks = src->st_blocks, /* number of blocks allocated */ 34 .ust_atime = src->st_atime, /* time of last access */ 35 .ust_mtime = src->st_mtime, /* time of last modification */ 36 .ust_ctime = src->st_ctime, /* time of last change */ 37 }); 38 } 39 40 int os_stat_fd(const int fd, struct uml_stat *ubuf) 41 { 42 struct stat64 sbuf; 43 int err; 44 45 do { 46 err = fstat64(fd, &sbuf); 47 } while((err < 0) && (errno == EINTR)) ; 48 49 if(err < 0) 50 return(-errno); 51 52 if(ubuf != NULL) 53 copy_stat(ubuf, &sbuf); 54 return(err); 55 } 56 57 int os_stat_file(const char *file_name, struct uml_stat *ubuf) 58 { 59 struct stat64 sbuf; 60 int err; 61 62 do { 63 err = stat64(file_name, &sbuf); 64 } while((err < 0) && (errno == EINTR)) ; 65 66 if(err < 0) 67 return(-errno); 68 69 if(ubuf != NULL) 70 copy_stat(ubuf, &sbuf); 71 return(err); 72 } 73 74 int os_access(const char* file, int mode) 75 { 76 int amode, err; 77 78 amode=(mode&OS_ACC_R_OK ? R_OK : 0) | (mode&OS_ACC_W_OK ? W_OK : 0) | 79 (mode&OS_ACC_X_OK ? X_OK : 0) | (mode&OS_ACC_F_OK ? F_OK : 0) ; 80 81 err = access(file, amode); 82 if(err < 0) 83 return(-errno); 84 85 return(0); 86 } 87 88 void os_print_error(int error, const char* str) 89 { 90 errno = error < 0 ? -error : error; 91 92 perror(str); 93 } 94 95 /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ 96 int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) 97 { 98 int err; 99 100 err = ioctl(fd, cmd, arg); 101 if(err < 0) 102 return(-errno); 103 104 return(err); 105 } 106 107 int os_window_size(int fd, int *rows, int *cols) 108 { 109 struct winsize size; 110 111 if(ioctl(fd, TIOCGWINSZ, &size) < 0) 112 return(-errno); 113 114 *rows = size.ws_row; 115 *cols = size.ws_col; 116 117 return(0); 118 } 119 120 int os_new_tty_pgrp(int fd, int pid) 121 { 122 if(ioctl(fd, TIOCSCTTY, 0) < 0){ 123 printk("TIOCSCTTY failed, errno = %d\n", errno); 124 return(-errno); 125 } 126 127 if(tcsetpgrp(fd, pid) < 0){ 128 printk("tcsetpgrp failed, errno = %d\n", errno); 129 return(-errno); 130 } 131 132 return(0); 133 } 134 135 /* FIXME: ensure namebuf in os_get_if_name is big enough */ 136 int os_get_ifname(int fd, char* namebuf) 137 { 138 if(ioctl(fd, SIOCGIFNAME, namebuf) < 0) 139 return(-errno); 140 141 return(0); 142 } 143 144 int os_set_slip(int fd) 145 { 146 int disc, sencap; 147 148 disc = N_SLIP; 149 if(ioctl(fd, TIOCSETD, &disc) < 0){ 150 printk("Failed to set slip line discipline - " 151 "errno = %d\n", errno); 152 return(-errno); 153 } 154 155 sencap = 0; 156 if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0){ 157 printk("Failed to set slip encapsulation - " 158 "errno = %d\n", errno); 159 return(-errno); 160 } 161 162 return(0); 163 } 164 165 int os_set_owner(int fd, int pid) 166 { 167 if(fcntl(fd, F_SETOWN, pid) < 0){ 168 int save_errno = errno; 169 170 if(fcntl(fd, F_GETOWN, 0) != pid) 171 return(-save_errno); 172 } 173 174 return(0); 175 } 176 177 /* FIXME? moved wholesale from sigio_user.c to get fcntls out of that file */ 178 int os_sigio_async(int master, int slave) 179 { 180 int flags; 181 182 flags = fcntl(master, F_GETFL); 183 if(flags < 0) { 184 printk("fcntl F_GETFL failed, errno = %d\n", errno); 185 return(-errno); 186 } 187 188 if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) || 189 (fcntl(master, F_SETOWN, os_getpid()) < 0)){ 190 printk("fcntl F_SETFL or F_SETOWN failed, errno = %d\n", 191 errno); 192 return(-errno); 193 } 194 195 if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0)){ 196 printk("fcntl F_SETFL failed, errno = %d\n", errno); 197 return(-errno); 198 } 199 200 return(0); 201 } 202 203 int os_mode_fd(int fd, int mode) 204 { 205 int err; 206 207 do { 208 err = fchmod(fd, mode); 209 } while((err < 0) && (errno==EINTR)) ; 210 211 if(err < 0) 212 return(-errno); 213 214 return(0); 215 } 216 217 int os_file_type(char *file) 218 { 219 struct uml_stat buf; 220 int err; 221 222 err = os_stat_file(file, &buf); 223 if(err < 0) 224 return(err); 225 226 if(S_ISDIR(buf.ust_mode)) return(OS_TYPE_DIR); 227 else if(S_ISLNK(buf.ust_mode)) return(OS_TYPE_SYMLINK); 228 else if(S_ISCHR(buf.ust_mode)) return(OS_TYPE_CHARDEV); 229 else if(S_ISBLK(buf.ust_mode)) return(OS_TYPE_BLOCKDEV); 230 else if(S_ISFIFO(buf.ust_mode)) return(OS_TYPE_FIFO); 231 else if(S_ISSOCK(buf.ust_mode)) return(OS_TYPE_SOCK); 232 else return(OS_TYPE_FILE); 233 } 234 235 int os_file_mode(char *file, struct openflags *mode_out) 236 { 237 int err; 238 239 *mode_out = OPENFLAGS(); 240 241 err = os_access(file, OS_ACC_W_OK); 242 if((err < 0) && (err != -EACCES)) 243 return(err); 244 245 *mode_out = of_write(*mode_out); 246 247 err = os_access(file, OS_ACC_R_OK); 248 if((err < 0) && (err != -EACCES)) 249 return(err); 250 251 *mode_out = of_read(*mode_out); 252 253 return(0); 254 } 255 256 int os_open_file(char *file, struct openflags flags, int mode) 257 { 258 int fd, f = 0; 259 260 if(flags.r && flags.w) f = O_RDWR; 261 else if(flags.r) f = O_RDONLY; 262 else if(flags.w) f = O_WRONLY; 263 else f = 0; 264 265 if(flags.s) f |= O_SYNC; 266 if(flags.c) f |= O_CREAT; 267 if(flags.t) f |= O_TRUNC; 268 if(flags.e) f |= O_EXCL; 269 270 fd = open64(file, f, mode); 271 if(fd < 0) 272 return(-errno); 273 274 if(flags.cl && fcntl(fd, F_SETFD, 1)){ 275 os_close_file(fd); 276 return(-errno); 277 } 278 279 return(fd); 280 } 281 282 int os_connect_socket(char *name) 283 { 284 struct sockaddr_un sock; 285 int fd, err; 286 287 sock.sun_family = AF_UNIX; 288 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 289 290 fd = socket(AF_UNIX, SOCK_STREAM, 0); 291 if(fd < 0) 292 return(fd); 293 294 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 295 if(err) 296 return(-errno); 297 298 return(fd); 299 } 300 301 void os_close_file(int fd) 302 { 303 close(fd); 304 } 305 306 int os_seek_file(int fd, __u64 offset) 307 { 308 __u64 actual; 309 310 actual = lseek64(fd, offset, SEEK_SET); 311 if(actual != offset) 312 return(-errno); 313 return(0); 314 } 315 316 static int fault_buffer(void *start, int len, 317 int (*copy_proc)(void *addr, void *buf, int len)) 318 { 319 int page = getpagesize(), i; 320 char c; 321 322 for(i = 0; i < len; i += page){ 323 if((*copy_proc)(start + i, &c, sizeof(c))) 324 return(-EFAULT); 325 } 326 if((len % page) != 0){ 327 if((*copy_proc)(start + len - 1, &c, sizeof(c))) 328 return(-EFAULT); 329 } 330 return(0); 331 } 332 333 static int file_io(int fd, void *buf, int len, 334 int (*io_proc)(int fd, void *buf, int len), 335 int (*copy_user_proc)(void *addr, void *buf, int len)) 336 { 337 int n, err; 338 339 do { 340 n = (*io_proc)(fd, buf, len); 341 if((n < 0) && (errno == EFAULT)){ 342 err = fault_buffer(buf, len, copy_user_proc); 343 if(err) 344 return(err); 345 n = (*io_proc)(fd, buf, len); 346 } 347 } while((n < 0) && (errno == EINTR)); 348 349 if(n < 0) 350 return(-errno); 351 return(n); 352 } 353 354 int os_read_file(int fd, void *buf, int len) 355 { 356 return(file_io(fd, buf, len, (int (*)(int, void *, int)) read, 357 copy_from_user_proc)); 358 } 359 360 int os_write_file(int fd, const void *buf, int len) 361 { 362 return(file_io(fd, (void *) buf, len, 363 (int (*)(int, void *, int)) write, copy_to_user_proc)); 364 } 365 366 int os_file_size(char *file, unsigned long long *size_out) 367 { 368 struct uml_stat buf; 369 int err; 370 371 err = os_stat_file(file, &buf); 372 if(err < 0){ 373 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 374 return(err); 375 } 376 377 if(S_ISBLK(buf.ust_mode)){ 378 int fd, blocks; 379 380 fd = os_open_file(file, of_read(OPENFLAGS()), 0); 381 if(fd < 0){ 382 printk("Couldn't open \"%s\", errno = %d\n", file, -fd); 383 return(fd); 384 } 385 if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ 386 printk("Couldn't get the block size of \"%s\", " 387 "errno = %d\n", file, errno); 388 err = -errno; 389 os_close_file(fd); 390 return(err); 391 } 392 *size_out = ((long long) blocks) * 512; 393 os_close_file(fd); 394 return(0); 395 } 396 *size_out = buf.ust_size; 397 return(0); 398 } 399 400 int os_file_modtime(char *file, unsigned long *modtime) 401 { 402 struct uml_stat buf; 403 int err; 404 405 err = os_stat_file(file, &buf); 406 if(err < 0){ 407 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 408 return(err); 409 } 410 411 *modtime = buf.ust_mtime; 412 return(0); 413 } 414 415 int os_get_exec_close(int fd, int* close_on_exec) 416 { 417 int ret; 418 419 do { 420 ret = fcntl(fd, F_GETFD); 421 } while((ret < 0) && (errno == EINTR)) ; 422 423 if(ret < 0) 424 return(-errno); 425 426 *close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0; 427 return(ret); 428 } 429 430 int os_set_exec_close(int fd, int close_on_exec) 431 { 432 int flag, err; 433 434 if(close_on_exec) flag = FD_CLOEXEC; 435 else flag = 0; 436 437 do { 438 err = fcntl(fd, F_SETFD, flag); 439 } while((err < 0) && (errno == EINTR)) ; 440 441 if(err < 0) 442 return(-errno); 443 return(err); 444 } 445 446 int os_pipe(int *fds, int stream, int close_on_exec) 447 { 448 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 449 450 err = socketpair(AF_UNIX, type, 0, fds); 451 if(err < 0) 452 return(-errno); 453 454 if(!close_on_exec) 455 return(0); 456 457 err = os_set_exec_close(fds[0], 1); 458 if(err < 0) 459 goto error; 460 461 err = os_set_exec_close(fds[1], 1); 462 if(err < 0) 463 goto error; 464 465 return(0); 466 467 error: 468 printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); 469 os_close_file(fds[1]); 470 os_close_file(fds[0]); 471 return(err); 472 } 473 474 int os_set_fd_async(int fd, int owner) 475 { 476 /* XXX This should do F_GETFL first */ 477 if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ 478 printk("os_set_fd_async : failed to set O_ASYNC and " 479 "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 480 return(-errno); 481 } 482 #ifdef notdef 483 if(fcntl(fd, F_SETFD, 1) < 0){ 484 printk("os_set_fd_async : Setting FD_CLOEXEC failed, " 485 "errno = %d\n", errno); 486 } 487 #endif 488 489 if((fcntl(fd, F_SETSIG, SIGIO) < 0) || 490 (fcntl(fd, F_SETOWN, owner) < 0)){ 491 printk("os_set_fd_async : Failed to fcntl F_SETOWN " 492 "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, 493 owner, errno); 494 return(-errno); 495 } 496 497 return(0); 498 } 499 500 int os_clear_fd_async(int fd) 501 { 502 int flags = fcntl(fd, F_GETFL); 503 504 flags &= ~(O_ASYNC | O_NONBLOCK); 505 if(fcntl(fd, F_SETFL, flags) < 0) 506 return(-errno); 507 return(0); 508 } 509 510 int os_set_fd_block(int fd, int blocking) 511 { 512 int flags; 513 514 flags = fcntl(fd, F_GETFL); 515 516 if(blocking) flags &= ~O_NONBLOCK; 517 else flags |= O_NONBLOCK; 518 519 if(fcntl(fd, F_SETFL, flags) < 0){ 520 printk("Failed to change blocking on fd # %d, errno = %d\n", 521 fd, errno); 522 return(-errno); 523 } 524 return(0); 525 } 526 527 int os_accept_connection(int fd) 528 { 529 int new; 530 531 new = accept(fd, NULL, 0); 532 if(new < 0) 533 return(-errno); 534 return(new); 535 } 536 537 #ifndef SHUT_RD 538 #define SHUT_RD 0 539 #endif 540 541 #ifndef SHUT_WR 542 #define SHUT_WR 1 543 #endif 544 545 #ifndef SHUT_RDWR 546 #define SHUT_RDWR 2 547 #endif 548 549 int os_shutdown_socket(int fd, int r, int w) 550 { 551 int what, err; 552 553 if(r && w) what = SHUT_RDWR; 554 else if(r) what = SHUT_RD; 555 else if(w) what = SHUT_WR; 556 else { 557 printk("os_shutdown_socket : neither r or w was set\n"); 558 return(-EINVAL); 559 } 560 err = shutdown(fd, what); 561 if(err < 0) 562 return(-errno); 563 return(0); 564 } 565 566 int os_rcv_fd(int fd, int *helper_pid_out) 567 { 568 int new, n; 569 char buf[CMSG_SPACE(sizeof(new))]; 570 struct msghdr msg; 571 struct cmsghdr *cmsg; 572 struct iovec iov; 573 574 msg.msg_name = NULL; 575 msg.msg_namelen = 0; 576 iov = ((struct iovec) { .iov_base = helper_pid_out, 577 .iov_len = sizeof(*helper_pid_out) }); 578 msg.msg_iov = &iov; 579 msg.msg_iovlen = 1; 580 msg.msg_control = buf; 581 msg.msg_controllen = sizeof(buf); 582 msg.msg_flags = 0; 583 584 n = recvmsg(fd, &msg, 0); 585 if(n < 0) 586 return(-errno); 587 588 else if(n != sizeof(iov.iov_len)) 589 *helper_pid_out = -1; 590 591 cmsg = CMSG_FIRSTHDR(&msg); 592 if(cmsg == NULL){ 593 printk("rcv_fd didn't receive anything, error = %d\n", errno); 594 return(-1); 595 } 596 if((cmsg->cmsg_level != SOL_SOCKET) || 597 (cmsg->cmsg_type != SCM_RIGHTS)){ 598 printk("rcv_fd didn't receive a descriptor\n"); 599 return(-1); 600 } 601 602 new = ((int *) CMSG_DATA(cmsg))[0]; 603 return(new); 604 } 605 606 int os_create_unix_socket(char *file, int len, int close_on_exec) 607 { 608 struct sockaddr_un addr; 609 int sock, err; 610 611 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 612 if (sock < 0){ 613 printk("create_unix_socket - socket failed, errno = %d\n", 614 errno); 615 return(-errno); 616 } 617 618 if(close_on_exec) { 619 err = os_set_exec_close(sock, 1); 620 if(err < 0) 621 printk("create_unix_socket : close_on_exec failed, " 622 "err = %d", -err); 623 } 624 625 addr.sun_family = AF_UNIX; 626 627 /* XXX Be more careful about overflow */ 628 snprintf(addr.sun_path, len, "%s", file); 629 630 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 631 if (err < 0){ 632 printk("create_listening_socket at '%s' - bind failed, " 633 "errno = %d\n", file, errno); 634 return(-errno); 635 } 636 637 return(sock); 638 } 639 640 void os_flush_stdout(void) 641 { 642 fflush(stdout); 643 } 644 645 int os_lock_file(int fd, int excl) 646 { 647 int type = excl ? F_WRLCK : F_RDLCK; 648 struct flock lock = ((struct flock) { .l_type = type, 649 .l_whence = SEEK_SET, 650 .l_start = 0, 651 .l_len = 0 } ); 652 int err, save; 653 654 err = fcntl(fd, F_SETLK, &lock); 655 if(!err) 656 goto out; 657 658 save = -errno; 659 err = fcntl(fd, F_GETLK, &lock); 660 if(err){ 661 err = -errno; 662 goto out; 663 } 664 665 printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); 666 err = save; 667 out: 668 return(err); 669 } 670 671 /* 672 * Overrides for Emacs so that we follow Linus's tabbing style. 673 * Emacs will notice this stuff at the end of the file and automatically 674 * adjust the settings for this buffer only. This must remain at the end 675 * of the file. 676 * --------------------------------------------------------------------------- 677 * Local variables: 678 * c-file-style: "linux" 679 * End: 680 */ 681