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 return -errno; 124 125 if(tcsetpgrp(fd, pid) < 0) 126 return -errno; 127 128 return(0); 129 } 130 131 /* FIXME: ensure namebuf in os_get_if_name is big enough */ 132 int os_get_ifname(int fd, char* namebuf) 133 { 134 if(ioctl(fd, SIOCGIFNAME, namebuf) < 0) 135 return(-errno); 136 137 return(0); 138 } 139 140 int os_set_slip(int fd) 141 { 142 int disc, sencap; 143 144 disc = N_SLIP; 145 if(ioctl(fd, TIOCSETD, &disc) < 0) 146 return -errno; 147 148 sencap = 0; 149 if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0) 150 return -errno; 151 152 return(0); 153 } 154 155 int os_set_owner(int fd, int pid) 156 { 157 if(fcntl(fd, F_SETOWN, pid) < 0){ 158 int save_errno = errno; 159 160 if(fcntl(fd, F_GETOWN, 0) != pid) 161 return(-save_errno); 162 } 163 164 return(0); 165 } 166 167 /* FIXME? moved wholesale from sigio_user.c to get fcntls out of that file */ 168 int os_sigio_async(int master, int slave) 169 { 170 int flags; 171 172 flags = fcntl(master, F_GETFL); 173 if(flags < 0) 174 return -errno; 175 176 if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) || 177 (fcntl(master, F_SETOWN, os_getpid()) < 0)) 178 return -errno; 179 180 if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0)) 181 return -errno; 182 183 return(0); 184 } 185 186 int os_mode_fd(int fd, int mode) 187 { 188 int err; 189 190 do { 191 err = fchmod(fd, mode); 192 } while((err < 0) && (errno==EINTR)) ; 193 194 if(err < 0) 195 return(-errno); 196 197 return(0); 198 } 199 200 int os_file_type(char *file) 201 { 202 struct uml_stat buf; 203 int err; 204 205 err = os_stat_file(file, &buf); 206 if(err < 0) 207 return(err); 208 209 if(S_ISDIR(buf.ust_mode)) return(OS_TYPE_DIR); 210 else if(S_ISLNK(buf.ust_mode)) return(OS_TYPE_SYMLINK); 211 else if(S_ISCHR(buf.ust_mode)) return(OS_TYPE_CHARDEV); 212 else if(S_ISBLK(buf.ust_mode)) return(OS_TYPE_BLOCKDEV); 213 else if(S_ISFIFO(buf.ust_mode)) return(OS_TYPE_FIFO); 214 else if(S_ISSOCK(buf.ust_mode)) return(OS_TYPE_SOCK); 215 else return(OS_TYPE_FILE); 216 } 217 218 int os_file_mode(char *file, struct openflags *mode_out) 219 { 220 int err; 221 222 *mode_out = OPENFLAGS(); 223 224 err = os_access(file, OS_ACC_W_OK); 225 if((err < 0) && (err != -EACCES)) 226 return(err); 227 228 *mode_out = of_write(*mode_out); 229 230 err = os_access(file, OS_ACC_R_OK); 231 if((err < 0) && (err != -EACCES)) 232 return(err); 233 234 *mode_out = of_read(*mode_out); 235 236 return(0); 237 } 238 239 int os_open_file(char *file, struct openflags flags, int mode) 240 { 241 int fd, err, f = 0; 242 243 if(flags.r && flags.w) f = O_RDWR; 244 else if(flags.r) f = O_RDONLY; 245 else if(flags.w) f = O_WRONLY; 246 else f = 0; 247 248 if(flags.s) f |= O_SYNC; 249 if(flags.c) f |= O_CREAT; 250 if(flags.t) f |= O_TRUNC; 251 if(flags.e) f |= O_EXCL; 252 253 fd = open64(file, f, mode); 254 if(fd < 0) 255 return(-errno); 256 257 if(flags.cl && fcntl(fd, F_SETFD, 1)){ 258 err = -errno; 259 os_close_file(fd); 260 return err; 261 } 262 263 return(fd); 264 } 265 266 int os_connect_socket(char *name) 267 { 268 struct sockaddr_un sock; 269 int fd, err; 270 271 sock.sun_family = AF_UNIX; 272 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 273 274 fd = socket(AF_UNIX, SOCK_STREAM, 0); 275 if(fd < 0) { 276 err = -errno; 277 goto out; 278 } 279 280 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 281 if(err) { 282 err = -errno; 283 goto out_close; 284 } 285 286 return fd; 287 288 out_close: 289 close(fd); 290 out: 291 return err; 292 } 293 294 void os_close_file(int fd) 295 { 296 close(fd); 297 } 298 299 int os_seek_file(int fd, __u64 offset) 300 { 301 __u64 actual; 302 303 actual = lseek64(fd, offset, SEEK_SET); 304 if(actual != offset) 305 return(-errno); 306 return(0); 307 } 308 309 static int fault_buffer(void *start, int len, 310 int (*copy_proc)(void *addr, void *buf, int len)) 311 { 312 int page = getpagesize(), i; 313 char c; 314 315 for(i = 0; i < len; i += page){ 316 if((*copy_proc)(start + i, &c, sizeof(c))) 317 return(-EFAULT); 318 } 319 if((len % page) != 0){ 320 if((*copy_proc)(start + len - 1, &c, sizeof(c))) 321 return(-EFAULT); 322 } 323 return(0); 324 } 325 326 static int file_io(int fd, void *buf, int len, 327 int (*io_proc)(int fd, void *buf, int len), 328 int (*copy_user_proc)(void *addr, void *buf, int len)) 329 { 330 int n, err; 331 332 do { 333 n = (*io_proc)(fd, buf, len); 334 if((n < 0) && (errno == EFAULT)){ 335 err = fault_buffer(buf, len, copy_user_proc); 336 if(err) 337 return(err); 338 n = (*io_proc)(fd, buf, len); 339 } 340 } while((n < 0) && (errno == EINTR)); 341 342 if(n < 0) 343 return(-errno); 344 return(n); 345 } 346 347 int os_read_file(int fd, void *buf, int len) 348 { 349 return(file_io(fd, buf, len, (int (*)(int, void *, int)) read, 350 copy_from_user_proc)); 351 } 352 353 int os_write_file(int fd, const void *buf, int len) 354 { 355 return(file_io(fd, (void *) buf, len, 356 (int (*)(int, void *, int)) write, copy_to_user_proc)); 357 } 358 359 int os_file_size(char *file, unsigned long long *size_out) 360 { 361 struct uml_stat buf; 362 int err; 363 364 err = os_stat_file(file, &buf); 365 if(err < 0){ 366 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 367 return(err); 368 } 369 370 if(S_ISBLK(buf.ust_mode)){ 371 int fd, blocks; 372 373 fd = os_open_file(file, of_read(OPENFLAGS()), 0); 374 if(fd < 0){ 375 printk("Couldn't open \"%s\", errno = %d\n", file, -fd); 376 return(fd); 377 } 378 if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ 379 err = -errno; 380 printk("Couldn't get the block size of \"%s\", " 381 "errno = %d\n", file, errno); 382 os_close_file(fd); 383 return(err); 384 } 385 *size_out = ((long long) blocks) * 512; 386 os_close_file(fd); 387 return(0); 388 } 389 *size_out = buf.ust_size; 390 return(0); 391 } 392 393 int os_file_modtime(char *file, unsigned long *modtime) 394 { 395 struct uml_stat buf; 396 int err; 397 398 err = os_stat_file(file, &buf); 399 if(err < 0){ 400 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 401 return(err); 402 } 403 404 *modtime = buf.ust_mtime; 405 return(0); 406 } 407 408 int os_get_exec_close(int fd, int* close_on_exec) 409 { 410 int ret; 411 412 do { 413 ret = fcntl(fd, F_GETFD); 414 } while((ret < 0) && (errno == EINTR)) ; 415 416 if(ret < 0) 417 return(-errno); 418 419 *close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0; 420 return(ret); 421 } 422 423 int os_set_exec_close(int fd, int close_on_exec) 424 { 425 int flag, err; 426 427 if(close_on_exec) flag = FD_CLOEXEC; 428 else flag = 0; 429 430 do { 431 err = fcntl(fd, F_SETFD, flag); 432 } while((err < 0) && (errno == EINTR)) ; 433 434 if(err < 0) 435 return(-errno); 436 return(err); 437 } 438 439 int os_pipe(int *fds, int stream, int close_on_exec) 440 { 441 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 442 443 err = socketpair(AF_UNIX, type, 0, fds); 444 if(err < 0) 445 return(-errno); 446 447 if(!close_on_exec) 448 return(0); 449 450 err = os_set_exec_close(fds[0], 1); 451 if(err < 0) 452 goto error; 453 454 err = os_set_exec_close(fds[1], 1); 455 if(err < 0) 456 goto error; 457 458 return(0); 459 460 error: 461 printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); 462 os_close_file(fds[1]); 463 os_close_file(fds[0]); 464 return(err); 465 } 466 467 int os_set_fd_async(int fd, int owner) 468 { 469 int err; 470 471 /* XXX This should do F_GETFL first */ 472 if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ 473 err = -errno; 474 printk("os_set_fd_async : failed to set O_ASYNC and " 475 "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 476 return err; 477 } 478 #ifdef notdef 479 if(fcntl(fd, F_SETFD, 1) < 0){ 480 printk("os_set_fd_async : Setting FD_CLOEXEC failed, " 481 "errno = %d\n", errno); 482 } 483 #endif 484 485 if((fcntl(fd, F_SETSIG, SIGIO) < 0) || 486 (fcntl(fd, F_SETOWN, owner) < 0)){ 487 err = -errno; 488 printk("os_set_fd_async : Failed to fcntl F_SETOWN " 489 "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, 490 owner, errno); 491 return err; 492 } 493 494 return(0); 495 } 496 497 int os_clear_fd_async(int fd) 498 { 499 int flags = fcntl(fd, F_GETFL); 500 501 flags &= ~(O_ASYNC | O_NONBLOCK); 502 if(fcntl(fd, F_SETFL, flags) < 0) 503 return(-errno); 504 return(0); 505 } 506 507 int os_set_fd_block(int fd, int blocking) 508 { 509 int flags; 510 511 flags = fcntl(fd, F_GETFL); 512 513 if(blocking) flags &= ~O_NONBLOCK; 514 else flags |= O_NONBLOCK; 515 516 if(fcntl(fd, F_SETFL, flags) < 0) 517 return -errno; 518 519 return(0); 520 } 521 522 int os_accept_connection(int fd) 523 { 524 int new; 525 526 new = accept(fd, NULL, 0); 527 if(new < 0) 528 return(-errno); 529 return(new); 530 } 531 532 #ifndef SHUT_RD 533 #define SHUT_RD 0 534 #endif 535 536 #ifndef SHUT_WR 537 #define SHUT_WR 1 538 #endif 539 540 #ifndef SHUT_RDWR 541 #define SHUT_RDWR 2 542 #endif 543 544 int os_shutdown_socket(int fd, int r, int w) 545 { 546 int what, err; 547 548 if(r && w) what = SHUT_RDWR; 549 else if(r) what = SHUT_RD; 550 else if(w) what = SHUT_WR; 551 else { 552 printk("os_shutdown_socket : neither r or w was set\n"); 553 return(-EINVAL); 554 } 555 err = shutdown(fd, what); 556 if(err < 0) 557 return(-errno); 558 return(0); 559 } 560 561 int os_rcv_fd(int fd, int *helper_pid_out) 562 { 563 int new, n; 564 char buf[CMSG_SPACE(sizeof(new))]; 565 struct msghdr msg; 566 struct cmsghdr *cmsg; 567 struct iovec iov; 568 569 msg.msg_name = NULL; 570 msg.msg_namelen = 0; 571 iov = ((struct iovec) { .iov_base = helper_pid_out, 572 .iov_len = sizeof(*helper_pid_out) }); 573 msg.msg_iov = &iov; 574 msg.msg_iovlen = 1; 575 msg.msg_control = buf; 576 msg.msg_controllen = sizeof(buf); 577 msg.msg_flags = 0; 578 579 n = recvmsg(fd, &msg, 0); 580 if(n < 0) 581 return(-errno); 582 583 else if(n != sizeof(iov.iov_len)) 584 *helper_pid_out = -1; 585 586 cmsg = CMSG_FIRSTHDR(&msg); 587 if(cmsg == NULL){ 588 printk("rcv_fd didn't receive anything, error = %d\n", errno); 589 return(-1); 590 } 591 if((cmsg->cmsg_level != SOL_SOCKET) || 592 (cmsg->cmsg_type != SCM_RIGHTS)){ 593 printk("rcv_fd didn't receive a descriptor\n"); 594 return(-1); 595 } 596 597 new = ((int *) CMSG_DATA(cmsg))[0]; 598 return(new); 599 } 600 601 int os_create_unix_socket(char *file, int len, int close_on_exec) 602 { 603 struct sockaddr_un addr; 604 int sock, err; 605 606 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 607 if(sock < 0) 608 return -errno; 609 610 if(close_on_exec) { 611 err = os_set_exec_close(sock, 1); 612 if(err < 0) 613 printk("create_unix_socket : close_on_exec failed, " 614 "err = %d", -err); 615 } 616 617 addr.sun_family = AF_UNIX; 618 619 /* XXX Be more careful about overflow */ 620 snprintf(addr.sun_path, len, "%s", file); 621 622 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 623 if(err < 0) 624 return -errno; 625 626 return(sock); 627 } 628 629 void os_flush_stdout(void) 630 { 631 fflush(stdout); 632 } 633 634 int os_lock_file(int fd, int excl) 635 { 636 int type = excl ? F_WRLCK : F_RDLCK; 637 struct flock lock = ((struct flock) { .l_type = type, 638 .l_whence = SEEK_SET, 639 .l_start = 0, 640 .l_len = 0 } ); 641 int err, save; 642 643 err = fcntl(fd, F_SETLK, &lock); 644 if(!err) 645 goto out; 646 647 save = -errno; 648 err = fcntl(fd, F_GETLK, &lock); 649 if(err){ 650 err = -errno; 651 goto out; 652 } 653 654 printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); 655 err = save; 656 out: 657 return(err); 658 } 659 660 /* 661 * Overrides for Emacs so that we follow Linus's tabbing style. 662 * Emacs will notice this stuff at the end of the file and automatically 663 * adjust the settings for this buffer only. This must remain at the end 664 * of the file. 665 * --------------------------------------------------------------------------- 666 * Local variables: 667 * c-file-style: "linux" 668 * End: 669 */ 670