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 CATCH_EINTR(err = fstat64(fd, &sbuf)); 46 if(err < 0) 47 return -errno; 48 49 if(ubuf != NULL) 50 copy_stat(ubuf, &sbuf); 51 return err; 52 } 53 54 int os_stat_file(const char *file_name, struct uml_stat *ubuf) 55 { 56 struct stat64 sbuf; 57 int err; 58 59 do { 60 err = stat64(file_name, &sbuf); 61 } while((err < 0) && (errno == EINTR)) ; 62 63 if(err < 0) 64 return -errno; 65 66 if(ubuf != NULL) 67 copy_stat(ubuf, &sbuf); 68 return err; 69 } 70 71 int os_access(const char* file, int mode) 72 { 73 int amode, err; 74 75 amode=(mode&OS_ACC_R_OK ? R_OK : 0) | (mode&OS_ACC_W_OK ? W_OK : 0) | 76 (mode&OS_ACC_X_OK ? X_OK : 0) | (mode&OS_ACC_F_OK ? F_OK : 0) ; 77 78 err = access(file, amode); 79 if(err < 0) 80 return -errno; 81 82 return 0; 83 } 84 85 void os_print_error(int error, const char* str) 86 { 87 errno = error < 0 ? -error : error; 88 89 perror(str); 90 } 91 92 /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ 93 int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) 94 { 95 int err; 96 97 err = ioctl(fd, cmd, arg); 98 if(err < 0) 99 return -errno; 100 101 return err; 102 } 103 104 int os_new_tty_pgrp(int fd, int pid) 105 { 106 if(ioctl(fd, TIOCSCTTY, 0) < 0) 107 return -errno; 108 109 if(tcsetpgrp(fd, pid) < 0) 110 return -errno; 111 112 return 0; 113 } 114 115 /* FIXME: ensure namebuf in os_get_if_name is big enough */ 116 int os_get_ifname(int fd, char* namebuf) 117 { 118 if(ioctl(fd, SIOCGIFNAME, namebuf) < 0) 119 return -errno; 120 121 return 0; 122 } 123 124 int os_set_slip(int fd) 125 { 126 int disc, sencap; 127 128 disc = N_SLIP; 129 if(ioctl(fd, TIOCSETD, &disc) < 0) 130 return -errno; 131 132 sencap = 0; 133 if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0) 134 return -errno; 135 136 return 0; 137 } 138 139 int os_set_owner(int fd, int pid) 140 { 141 if(fcntl(fd, F_SETOWN, pid) < 0){ 142 int save_errno = errno; 143 144 if(fcntl(fd, F_GETOWN, 0) != pid) 145 return -save_errno; 146 } 147 148 return 0; 149 } 150 151 int os_mode_fd(int fd, int mode) 152 { 153 int err; 154 155 do { 156 err = fchmod(fd, mode); 157 } while((err < 0) && (errno==EINTR)) ; 158 159 if(err < 0) 160 return -errno; 161 162 return 0; 163 } 164 165 int os_file_type(char *file) 166 { 167 struct uml_stat buf; 168 int err; 169 170 err = os_stat_file(file, &buf); 171 if(err < 0) 172 return err; 173 174 if(S_ISDIR(buf.ust_mode)) 175 return OS_TYPE_DIR; 176 else if(S_ISLNK(buf.ust_mode)) 177 return OS_TYPE_SYMLINK; 178 else if(S_ISCHR(buf.ust_mode)) 179 return OS_TYPE_CHARDEV; 180 else if(S_ISBLK(buf.ust_mode)) 181 return OS_TYPE_BLOCKDEV; 182 else if(S_ISFIFO(buf.ust_mode)) 183 return OS_TYPE_FIFO; 184 else if(S_ISSOCK(buf.ust_mode)) 185 return OS_TYPE_SOCK; 186 else return OS_TYPE_FILE; 187 } 188 189 int os_file_mode(char *file, struct openflags *mode_out) 190 { 191 int err; 192 193 *mode_out = OPENFLAGS(); 194 195 err = os_access(file, OS_ACC_W_OK); 196 if((err < 0) && (err != -EACCES)) 197 return(err); 198 199 *mode_out = of_write(*mode_out); 200 201 err = os_access(file, OS_ACC_R_OK); 202 if((err < 0) && (err != -EACCES)) 203 return(err); 204 205 *mode_out = of_read(*mode_out); 206 207 return(0); 208 } 209 210 int os_open_file(char *file, struct openflags flags, int mode) 211 { 212 int fd, err, f = 0; 213 214 if(flags.r && flags.w) f = O_RDWR; 215 else if(flags.r) f = O_RDONLY; 216 else if(flags.w) f = O_WRONLY; 217 else f = 0; 218 219 if(flags.s) f |= O_SYNC; 220 if(flags.c) f |= O_CREAT; 221 if(flags.t) f |= O_TRUNC; 222 if(flags.e) f |= O_EXCL; 223 224 fd = open64(file, f, mode); 225 if(fd < 0) 226 return(-errno); 227 228 if(flags.cl && fcntl(fd, F_SETFD, 1)){ 229 err = -errno; 230 os_close_file(fd); 231 return err; 232 } 233 234 return(fd); 235 } 236 237 int os_connect_socket(char *name) 238 { 239 struct sockaddr_un sock; 240 int fd, err; 241 242 sock.sun_family = AF_UNIX; 243 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 244 245 fd = socket(AF_UNIX, SOCK_STREAM, 0); 246 if(fd < 0) { 247 err = -errno; 248 goto out; 249 } 250 251 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 252 if(err) { 253 err = -errno; 254 goto out_close; 255 } 256 257 return fd; 258 259 out_close: 260 close(fd); 261 out: 262 return err; 263 } 264 265 void os_close_file(int fd) 266 { 267 close(fd); 268 } 269 270 int os_seek_file(int fd, __u64 offset) 271 { 272 __u64 actual; 273 274 actual = lseek64(fd, offset, SEEK_SET); 275 if(actual != offset) 276 return -errno; 277 return 0; 278 } 279 280 int os_read_file(int fd, void *buf, int len) 281 { 282 int n = read(fd, buf, len); 283 284 if(n < 0) 285 return -errno; 286 return n; 287 } 288 289 int os_write_file(int fd, const void *buf, int len) 290 { 291 int n = write(fd, (void *) buf, len); 292 293 if(n < 0) 294 return -errno; 295 return n; 296 } 297 298 int os_file_size(char *file, unsigned long long *size_out) 299 { 300 struct uml_stat buf; 301 int err; 302 303 err = os_stat_file(file, &buf); 304 if(err < 0){ 305 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 306 return(err); 307 } 308 309 if(S_ISBLK(buf.ust_mode)){ 310 int fd; 311 long blocks; 312 313 fd = os_open_file(file, of_read(OPENFLAGS()), 0); 314 if(fd < 0){ 315 printk("Couldn't open \"%s\", errno = %d\n", file, -fd); 316 return(fd); 317 } 318 if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ 319 err = -errno; 320 printk("Couldn't get the block size of \"%s\", " 321 "errno = %d\n", file, errno); 322 os_close_file(fd); 323 return(err); 324 } 325 *size_out = ((long long) blocks) * 512; 326 os_close_file(fd); 327 return(0); 328 } 329 *size_out = buf.ust_size; 330 return(0); 331 } 332 333 int os_file_modtime(char *file, unsigned long *modtime) 334 { 335 struct uml_stat buf; 336 int err; 337 338 err = os_stat_file(file, &buf); 339 if(err < 0){ 340 printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 341 return err; 342 } 343 344 *modtime = buf.ust_mtime; 345 return 0; 346 } 347 348 int os_get_exec_close(int fd, int* close_on_exec) 349 { 350 int ret; 351 352 do { 353 ret = fcntl(fd, F_GETFD); 354 } while((ret < 0) && (errno == EINTR)) ; 355 356 if(ret < 0) 357 return(-errno); 358 359 *close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0; 360 return(ret); 361 } 362 363 int os_set_exec_close(int fd, int close_on_exec) 364 { 365 int flag, err; 366 367 if(close_on_exec) flag = FD_CLOEXEC; 368 else flag = 0; 369 370 do { 371 err = fcntl(fd, F_SETFD, flag); 372 } while((err < 0) && (errno == EINTR)) ; 373 374 if(err < 0) 375 return(-errno); 376 return(err); 377 } 378 379 int os_pipe(int *fds, int stream, int close_on_exec) 380 { 381 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 382 383 err = socketpair(AF_UNIX, type, 0, fds); 384 if(err < 0) 385 return(-errno); 386 387 if(!close_on_exec) 388 return(0); 389 390 err = os_set_exec_close(fds[0], 1); 391 if(err < 0) 392 goto error; 393 394 err = os_set_exec_close(fds[1], 1); 395 if(err < 0) 396 goto error; 397 398 return 0; 399 400 error: 401 printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); 402 os_close_file(fds[1]); 403 os_close_file(fds[0]); 404 return(err); 405 } 406 407 int os_set_fd_async(int fd, int owner) 408 { 409 int err; 410 411 /* XXX This should do F_GETFL first */ 412 if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ 413 err = -errno; 414 printk("os_set_fd_async : failed to set O_ASYNC and " 415 "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 416 return err; 417 } 418 #ifdef notdef 419 if(fcntl(fd, F_SETFD, 1) < 0){ 420 printk("os_set_fd_async : Setting FD_CLOEXEC failed, " 421 "errno = %d\n", errno); 422 } 423 #endif 424 425 if((fcntl(fd, F_SETSIG, SIGIO) < 0) || 426 (fcntl(fd, F_SETOWN, owner) < 0)){ 427 err = -errno; 428 printk("os_set_fd_async : Failed to fcntl F_SETOWN " 429 "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, 430 owner, errno); 431 return err; 432 } 433 434 return 0; 435 } 436 437 int os_clear_fd_async(int fd) 438 { 439 int flags = fcntl(fd, F_GETFL); 440 441 flags &= ~(O_ASYNC | O_NONBLOCK); 442 if(fcntl(fd, F_SETFL, flags) < 0) 443 return -errno; 444 return 0; 445 } 446 447 int os_set_fd_block(int fd, int blocking) 448 { 449 int flags; 450 451 flags = fcntl(fd, F_GETFL); 452 453 if(blocking) flags &= ~O_NONBLOCK; 454 else flags |= O_NONBLOCK; 455 456 if(fcntl(fd, F_SETFL, flags) < 0) 457 return -errno; 458 459 return 0; 460 } 461 462 int os_accept_connection(int fd) 463 { 464 int new; 465 466 new = accept(fd, NULL, 0); 467 if(new < 0) 468 return -errno; 469 return new; 470 } 471 472 #ifndef SHUT_RD 473 #define SHUT_RD 0 474 #endif 475 476 #ifndef SHUT_WR 477 #define SHUT_WR 1 478 #endif 479 480 #ifndef SHUT_RDWR 481 #define SHUT_RDWR 2 482 #endif 483 484 int os_shutdown_socket(int fd, int r, int w) 485 { 486 int what, err; 487 488 if(r && w) what = SHUT_RDWR; 489 else if(r) what = SHUT_RD; 490 else if(w) what = SHUT_WR; 491 else { 492 printk("os_shutdown_socket : neither r or w was set\n"); 493 return -EINVAL; 494 } 495 err = shutdown(fd, what); 496 if(err < 0) 497 return -errno; 498 return 0; 499 } 500 501 int os_rcv_fd(int fd, int *helper_pid_out) 502 { 503 int new, n; 504 char buf[CMSG_SPACE(sizeof(new))]; 505 struct msghdr msg; 506 struct cmsghdr *cmsg; 507 struct iovec iov; 508 509 msg.msg_name = NULL; 510 msg.msg_namelen = 0; 511 iov = ((struct iovec) { .iov_base = helper_pid_out, 512 .iov_len = sizeof(*helper_pid_out) }); 513 msg.msg_iov = &iov; 514 msg.msg_iovlen = 1; 515 msg.msg_control = buf; 516 msg.msg_controllen = sizeof(buf); 517 msg.msg_flags = 0; 518 519 n = recvmsg(fd, &msg, 0); 520 if(n < 0) 521 return -errno; 522 523 else if(n != sizeof(iov.iov_len)) 524 *helper_pid_out = -1; 525 526 cmsg = CMSG_FIRSTHDR(&msg); 527 if(cmsg == NULL){ 528 printk("rcv_fd didn't receive anything, error = %d\n", errno); 529 return -1; 530 } 531 if((cmsg->cmsg_level != SOL_SOCKET) || 532 (cmsg->cmsg_type != SCM_RIGHTS)){ 533 printk("rcv_fd didn't receive a descriptor\n"); 534 return -1; 535 } 536 537 new = ((int *) CMSG_DATA(cmsg))[0]; 538 return new; 539 } 540 541 int os_create_unix_socket(char *file, int len, int close_on_exec) 542 { 543 struct sockaddr_un addr; 544 int sock, err; 545 546 sock = socket(PF_UNIX, SOCK_DGRAM, 0); 547 if(sock < 0) 548 return -errno; 549 550 if(close_on_exec) { 551 err = os_set_exec_close(sock, 1); 552 if(err < 0) 553 printk("create_unix_socket : close_on_exec failed, " 554 "err = %d", -err); 555 } 556 557 addr.sun_family = AF_UNIX; 558 559 /* XXX Be more careful about overflow */ 560 snprintf(addr.sun_path, len, "%s", file); 561 562 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 563 if(err < 0) 564 return -errno; 565 566 return sock; 567 } 568 569 void os_flush_stdout(void) 570 { 571 fflush(stdout); 572 } 573 574 int os_lock_file(int fd, int excl) 575 { 576 int type = excl ? F_WRLCK : F_RDLCK; 577 struct flock lock = ((struct flock) { .l_type = type, 578 .l_whence = SEEK_SET, 579 .l_start = 0, 580 .l_len = 0 } ); 581 int err, save; 582 583 err = fcntl(fd, F_SETLK, &lock); 584 if(!err) 585 goto out; 586 587 save = -errno; 588 err = fcntl(fd, F_GETLK, &lock); 589 if(err){ 590 err = -errno; 591 goto out; 592 } 593 594 printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); 595 err = save; 596 out: 597 return err; 598 } 599