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