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 return(fd); 277 278 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 279 if(err) 280 return(-errno); 281 282 return(fd); 283 } 284 285 void os_close_file(int fd) 286 { 287 close(fd); 288 } 289 290 int os_seek_file(int fd, __u64 offset) 291 { 292 __u64 actual; 293 294 actual = lseek64(fd, offset, SEEK_SET); 295 if(actual != offset) 296 return(-errno); 297 return(0); 298 } 299 300 static int fault_buffer(void *start, int len, 301 int (*copy_proc)(void *addr, void *buf, int len)) 302 { 303 int page = getpagesize(), i; 304 char c; 305 306 for(i = 0; i < len; i += page){ 307 if((*copy_proc)(start + i, &c, sizeof(c))) 308 return(-EFAULT); 309 } 310 if((len % page) != 0){ 311 if((*copy_proc)(start + len - 1, &c, sizeof(c))) 312 return(-EFAULT); 313 } 314 return(0); 315 } 316 317 static int file_io(int fd, void *buf, int len, 318 int (*io_proc)(int fd, void *buf, int len), 319 int (*copy_user_proc)(void *addr, void *buf, int len)) 320 { 321 int n, err; 322 323 do { 324 n = (*io_proc)(fd, buf, len); 325 if((n < 0) && (errno == EFAULT)){ 326 err = fault_buffer(buf, len, copy_user_proc); 327 if(err) 328 return(err); 329 n = (*io_proc)(fd, buf, len); 330 } 331 } while((n < 0) && (errno == EINTR)); 332 333 if(n < 0) 334 return(-errno); 335 return(n); 336 } 337 338 int os_read_file(int fd, void *buf, int len) 339 { 340 return(file_io(fd, buf, len, (int (*)(int, void *, int)) read, 341 copy_from_user_proc)); 342 } 343 344 int os_write_file(int fd, const void *buf, int len) 345 { 346 return(file_io(fd, (void *) buf, len, 347 (int (*)(int, void *, int)) write, copy_to_user_proc)); 348 } 349 350 int os_file_size(char *file, unsigned long long *size_out) 351 { 352 struct uml_stat buf; 353 int err; 354 355 err = os_stat_file(file, &buf); 356 if(err < 0){ 357 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 358 return(err); 359 } 360 361 if(S_ISBLK(buf.ust_mode)){ 362 int fd, blocks; 363 364 fd = os_open_file(file, of_read(OPENFLAGS()), 0); 365 if(fd < 0){ 366 printk("Couldn't open \"%s\", errno = %d\n", file, -fd); 367 return(fd); 368 } 369 if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ 370 err = -errno; 371 printk("Couldn't get the block size of \"%s\", " 372 "errno = %d\n", file, errno); 373 os_close_file(fd); 374 return(err); 375 } 376 *size_out = ((long long) blocks) * 512; 377 os_close_file(fd); 378 return(0); 379 } 380 *size_out = buf.ust_size; 381 return(0); 382 } 383 384 int os_file_modtime(char *file, unsigned long *modtime) 385 { 386 struct uml_stat buf; 387 int err; 388 389 err = os_stat_file(file, &buf); 390 if(err < 0){ 391 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 392 return(err); 393 } 394 395 *modtime = buf.ust_mtime; 396 return(0); 397 } 398 399 int os_get_exec_close(int fd, int* close_on_exec) 400 { 401 int ret; 402 403 do { 404 ret = fcntl(fd, F_GETFD); 405 } while((ret < 0) && (errno == EINTR)) ; 406 407 if(ret < 0) 408 return(-errno); 409 410 *close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0; 411 return(ret); 412 } 413 414 int os_set_exec_close(int fd, int close_on_exec) 415 { 416 int flag, err; 417 418 if(close_on_exec) flag = FD_CLOEXEC; 419 else flag = 0; 420 421 do { 422 err = fcntl(fd, F_SETFD, flag); 423 } while((err < 0) && (errno == EINTR)) ; 424 425 if(err < 0) 426 return(-errno); 427 return(err); 428 } 429 430 int os_pipe(int *fds, int stream, int close_on_exec) 431 { 432 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 433 434 err = socketpair(AF_UNIX, type, 0, fds); 435 if(err < 0) 436 return(-errno); 437 438 if(!close_on_exec) 439 return(0); 440 441 err = os_set_exec_close(fds[0], 1); 442 if(err < 0) 443 goto error; 444 445 err = os_set_exec_close(fds[1], 1); 446 if(err < 0) 447 goto error; 448 449 return(0); 450 451 error: 452 printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); 453 os_close_file(fds[1]); 454 os_close_file(fds[0]); 455 return(err); 456 } 457 458 int os_set_fd_async(int fd, int owner) 459 { 460 int err; 461 462 /* XXX This should do F_GETFL first */ 463 if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ 464 err = -errno; 465 printk("os_set_fd_async : failed to set O_ASYNC and " 466 "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 467 return err; 468 } 469 #ifdef notdef 470 if(fcntl(fd, F_SETFD, 1) < 0){ 471 printk("os_set_fd_async : Setting FD_CLOEXEC failed, " 472 "errno = %d\n", errno); 473 } 474 #endif 475 476 if((fcntl(fd, F_SETSIG, SIGIO) < 0) || 477 (fcntl(fd, F_SETOWN, owner) < 0)){ 478 err = -errno; 479 printk("os_set_fd_async : Failed to fcntl F_SETOWN " 480 "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, 481 owner, errno); 482 return err; 483 } 484 485 return(0); 486 } 487 488 int os_clear_fd_async(int fd) 489 { 490 int flags = fcntl(fd, F_GETFL); 491 492 flags &= ~(O_ASYNC | O_NONBLOCK); 493 if(fcntl(fd, F_SETFL, flags) < 0) 494 return(-errno); 495 return(0); 496 } 497 498 int os_set_fd_block(int fd, int blocking) 499 { 500 int flags; 501 502 flags = fcntl(fd, F_GETFL); 503 504 if(blocking) flags &= ~O_NONBLOCK; 505 else flags |= O_NONBLOCK; 506 507 if(fcntl(fd, F_SETFL, flags) < 0) 508 return -errno; 509 510 return(0); 511 } 512 513 int os_accept_connection(int fd) 514 { 515 int new; 516 517 new = accept(fd, NULL, 0); 518 if(new < 0) 519 return(-errno); 520 return(new); 521 } 522 523 #ifndef SHUT_RD 524 #define SHUT_RD 0 525 #endif 526 527 #ifndef SHUT_WR 528 #define SHUT_WR 1 529 #endif 530 531 #ifndef SHUT_RDWR 532 #define SHUT_RDWR 2 533 #endif 534 535 int os_shutdown_socket(int fd, int r, int w) 536 { 537 int what, err; 538 539 if(r && w) what = SHUT_RDWR; 540 else if(r) what = SHUT_RD; 541 else if(w) what = SHUT_WR; 542 else { 543 printk("os_shutdown_socket : neither r or w was set\n"); 544 return(-EINVAL); 545 } 546 err = shutdown(fd, what); 547 if(err < 0) 548 return(-errno); 549 return(0); 550 } 551 552 int os_rcv_fd(int fd, int *helper_pid_out) 553 { 554 int new, n; 555 char buf[CMSG_SPACE(sizeof(new))]; 556 struct msghdr msg; 557 struct cmsghdr *cmsg; 558 struct iovec iov; 559 560 msg.msg_name = NULL; 561 msg.msg_namelen = 0; 562 iov = ((struct iovec) { .iov_base = helper_pid_out, 563 .iov_len = sizeof(*helper_pid_out) }); 564 msg.msg_iov = &iov; 565 msg.msg_iovlen = 1; 566 msg.msg_control = buf; 567 msg.msg_controllen = sizeof(buf); 568 msg.msg_flags = 0; 569 570 n = recvmsg(fd, &msg, 0); 571 if(n < 0) 572 return(-errno); 573 574 else if(n != sizeof(iov.iov_len)) 575 *helper_pid_out = -1; 576 577 cmsg = CMSG_FIRSTHDR(&msg); 578 if(cmsg == NULL){ 579 printk("rcv_fd didn't receive anything, error = %d\n", errno); 580 return(-1); 581 } 582 if((cmsg->cmsg_level != SOL_SOCKET) || 583 (cmsg->cmsg_type != SCM_RIGHTS)){ 584 printk("rcv_fd didn't receive a descriptor\n"); 585 return(-1); 586 } 587 588 new = ((int *) CMSG_DATA(cmsg))[0]; 589 return(new); 590 } 591 592 int os_create_unix_socket(char *file, int len, int close_on_exec) 593 { 594 struct sockaddr_un addr; 595 int sock, err; 596 597 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 598 if(sock < 0) 599 return -errno; 600 601 if(close_on_exec) { 602 err = os_set_exec_close(sock, 1); 603 if(err < 0) 604 printk("create_unix_socket : close_on_exec failed, " 605 "err = %d", -err); 606 } 607 608 addr.sun_family = AF_UNIX; 609 610 /* XXX Be more careful about overflow */ 611 snprintf(addr.sun_path, len, "%s", file); 612 613 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 614 if(err < 0) 615 return -errno; 616 617 return(sock); 618 } 619 620 void os_flush_stdout(void) 621 { 622 fflush(stdout); 623 } 624 625 int os_lock_file(int fd, int excl) 626 { 627 int type = excl ? F_WRLCK : F_RDLCK; 628 struct flock lock = ((struct flock) { .l_type = type, 629 .l_whence = SEEK_SET, 630 .l_start = 0, 631 .l_len = 0 } ); 632 int err, save; 633 634 err = fcntl(fd, F_SETLK, &lock); 635 if(!err) 636 goto out; 637 638 save = -errno; 639 err = fcntl(fd, F_GETLK, &lock); 640 if(err){ 641 err = -errno; 642 goto out; 643 } 644 645 printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); 646 err = save; 647 out: 648 return(err); 649 } 650 651 /* 652 * Overrides for Emacs so that we follow Linus's tabbing style. 653 * Emacs will notice this stuff at the end of the file and automatically 654 * adjust the settings for this buffer only. This must remain at the end 655 * of the file. 656 * --------------------------------------------------------------------------- 657 * Local variables: 658 * c-file-style: "linux" 659 * End: 660 */ 661