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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 <sys/types.h>
17#include <os.h>
18
19static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
20{
21 *dst = ((struct uml_stat) {
22 .ust_dev = src->st_dev,
23 .ust_ino = src->st_ino,
24 .ust_mode = src->st_mode,
25 .ust_nlink = src->st_nlink,
26 .ust_uid = src->st_uid,
27 .ust_gid = src->st_gid,
28 .ust_size = src->st_size,
29 .ust_blksize = src->st_blksize,
30 .ust_blocks = src->st_blocks,
31 .ust_atime = src->st_atime,
32 .ust_mtime = src->st_mtime,
33 .ust_ctime = src->st_ctime,
34 });
35}
36
37int os_stat_fd(const int fd, struct uml_stat *ubuf)
38{
39 struct stat64 sbuf;
40 int err;
41
42 CATCH_EINTR(err = fstat64(fd, &sbuf));
43 if (err < 0)
44 return -errno;
45
46 if (ubuf != NULL)
47 copy_stat(ubuf, &sbuf);
48 return err;
49}
50
51int os_stat_file(const char *file_name, struct uml_stat *ubuf)
52{
53 struct stat64 sbuf;
54 int err;
55
56 CATCH_EINTR(err = stat64(file_name, &sbuf));
57 if (err < 0)
58 return -errno;
59
60 if (ubuf != NULL)
61 copy_stat(ubuf, &sbuf);
62 return err;
63}
64
65int os_access(const char *file, int mode)
66{
67 int amode, err;
68
69 amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
70 (mode & OS_ACC_W_OK ? W_OK : 0) |
71 (mode & OS_ACC_X_OK ? X_OK : 0) |
72 (mode & OS_ACC_F_OK ? F_OK : 0);
73
74 err = access(file, amode);
75 if (err < 0)
76 return -errno;
77
78 return 0;
79}
80
81
82int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
83{
84 int err;
85
86 err = ioctl(fd, cmd, arg);
87 if (err < 0)
88 return -errno;
89
90 return err;
91}
92
93
94int os_get_ifname(int fd, char* namebuf)
95{
96 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
97 return -errno;
98
99 return 0;
100}
101
102int os_set_slip(int fd)
103{
104 int disc, sencap;
105
106 disc = N_SLIP;
107 if (ioctl(fd, TIOCSETD, &disc) < 0)
108 return -errno;
109
110 sencap = 0;
111 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
112 return -errno;
113
114 return 0;
115}
116
117int os_mode_fd(int fd, int mode)
118{
119 int err;
120
121 CATCH_EINTR(err = fchmod(fd, mode));
122 if (err < 0)
123 return -errno;
124
125 return 0;
126}
127
128int os_file_type(char *file)
129{
130 struct uml_stat buf;
131 int err;
132
133 err = os_stat_file(file, &buf);
134 if (err < 0)
135 return err;
136
137 if (S_ISDIR(buf.ust_mode))
138 return OS_TYPE_DIR;
139 else if (S_ISLNK(buf.ust_mode))
140 return OS_TYPE_SYMLINK;
141 else if (S_ISCHR(buf.ust_mode))
142 return OS_TYPE_CHARDEV;
143 else if (S_ISBLK(buf.ust_mode))
144 return OS_TYPE_BLOCKDEV;
145 else if (S_ISFIFO(buf.ust_mode))
146 return OS_TYPE_FIFO;
147 else if (S_ISSOCK(buf.ust_mode))
148 return OS_TYPE_SOCK;
149 else return OS_TYPE_FILE;
150}
151
152int os_file_mode(const char *file, struct openflags *mode_out)
153{
154 int err;
155
156 *mode_out = OPENFLAGS();
157
158 err = access(file, W_OK);
159 if (err && (errno != EACCES))
160 return -errno;
161 else if (!err)
162 *mode_out = of_write(*mode_out);
163
164 err = access(file, R_OK);
165 if (err && (errno != EACCES))
166 return -errno;
167 else if (!err)
168 *mode_out = of_read(*mode_out);
169
170 return err;
171}
172
173int os_open_file(const char *file, struct openflags flags, int mode)
174{
175 int fd, err, f = 0;
176
177 if (flags.r && flags.w)
178 f = O_RDWR;
179 else if (flags.r)
180 f = O_RDONLY;
181 else if (flags.w)
182 f = O_WRONLY;
183 else f = 0;
184
185 if (flags.s)
186 f |= O_SYNC;
187 if (flags.c)
188 f |= O_CREAT;
189 if (flags.t)
190 f |= O_TRUNC;
191 if (flags.e)
192 f |= O_EXCL;
193 if (flags.a)
194 f |= O_APPEND;
195
196 fd = open64(file, f, mode);
197 if (fd < 0)
198 return -errno;
199
200 if (flags.cl && fcntl(fd, F_SETFD, 1)) {
201 err = -errno;
202 close(fd);
203 return err;
204 }
205
206 return fd;
207}
208
209int os_connect_socket(const char *name)
210{
211 struct sockaddr_un sock;
212 int fd, err;
213
214 sock.sun_family = AF_UNIX;
215 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
216
217 fd = socket(AF_UNIX, SOCK_STREAM, 0);
218 if (fd < 0) {
219 err = -errno;
220 goto out;
221 }
222
223 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
224 if (err) {
225 err = -errno;
226 goto out_close;
227 }
228
229 return fd;
230
231out_close:
232 close(fd);
233out:
234 return err;
235}
236
237void os_close_file(int fd)
238{
239 close(fd);
240}
241int os_fsync_file(int fd)
242{
243 if (fsync(fd) < 0)
244 return -errno;
245 return 0;
246}
247
248int os_seek_file(int fd, unsigned long long offset)
249{
250 unsigned long long actual;
251
252 actual = lseek64(fd, offset, SEEK_SET);
253 if (actual != offset)
254 return -errno;
255 return 0;
256}
257
258int os_read_file(int fd, void *buf, int len)
259{
260 int n = read(fd, buf, len);
261
262 if (n < 0)
263 return -errno;
264 return n;
265}
266
267int os_pread_file(int fd, void *buf, int len, unsigned long long offset)
268{
269 int n = pread(fd, buf, len, offset);
270
271 if (n < 0)
272 return -errno;
273 return n;
274}
275
276int os_write_file(int fd, const void *buf, int len)
277{
278 int n = write(fd, (void *) buf, len);
279
280 if (n < 0)
281 return -errno;
282 return n;
283}
284
285int os_sync_file(int fd)
286{
287 int n = fsync(fd);
288
289 if (n < 0)
290 return -errno;
291 return n;
292}
293
294int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset)
295{
296 int n = pwrite(fd, (void *) buf, len, offset);
297
298 if (n < 0)
299 return -errno;
300 return n;
301}
302
303
304int os_file_size(const char *file, unsigned long long *size_out)
305{
306 struct uml_stat buf;
307 int err;
308
309 err = os_stat_file(file, &buf);
310 if (err < 0) {
311 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
312 -err);
313 return err;
314 }
315
316 if (S_ISBLK(buf.ust_mode)) {
317 int fd;
318 long blocks;
319
320 fd = open(file, O_RDONLY, 0);
321 if (fd < 0) {
322 err = -errno;
323 printk(UM_KERN_ERR "Couldn't open \"%s\", "
324 "errno = %d\n", file, errno);
325 return err;
326 }
327 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
328 err = -errno;
329 printk(UM_KERN_ERR "Couldn't get the block size of "
330 "\"%s\", errno = %d\n", file, errno);
331 close(fd);
332 return err;
333 }
334 *size_out = ((long long) blocks) * 512;
335 close(fd);
336 }
337 else *size_out = buf.ust_size;
338
339 return 0;
340}
341
342int os_file_modtime(const char *file, unsigned long *modtime)
343{
344 struct uml_stat buf;
345 int err;
346
347 err = os_stat_file(file, &buf);
348 if (err < 0) {
349 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
350 -err);
351 return err;
352 }
353
354 *modtime = buf.ust_mtime;
355 return 0;
356}
357
358int os_set_exec_close(int fd)
359{
360 int err;
361
362 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
363
364 if (err < 0)
365 return -errno;
366 return err;
367}
368
369int os_pipe(int *fds, int stream, int close_on_exec)
370{
371 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
372
373 err = socketpair(AF_UNIX, type, 0, fds);
374 if (err < 0)
375 return -errno;
376
377 if (!close_on_exec)
378 return 0;
379
380 err = os_set_exec_close(fds[0]);
381 if (err < 0)
382 goto error;
383
384 err = os_set_exec_close(fds[1]);
385 if (err < 0)
386 goto error;
387
388 return 0;
389
390 error:
391 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
392 -err);
393 close(fds[1]);
394 close(fds[0]);
395 return err;
396}
397
398int os_set_fd_async(int fd)
399{
400 int err, flags;
401
402 flags = fcntl(fd, F_GETFL);
403 if (flags < 0)
404 return -errno;
405
406 flags |= O_ASYNC | O_NONBLOCK;
407 if (fcntl(fd, F_SETFL, flags) < 0) {
408 err = -errno;
409 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
410 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
411 return err;
412 }
413
414 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
415 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
416 err = -errno;
417 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
418 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
419 return err;
420 }
421
422 return 0;
423}
424
425int os_clear_fd_async(int fd)
426{
427 int flags;
428
429 flags = fcntl(fd, F_GETFL);
430 if (flags < 0)
431 return -errno;
432
433 flags &= ~(O_ASYNC | O_NONBLOCK);
434 if (fcntl(fd, F_SETFL, flags) < 0)
435 return -errno;
436 return 0;
437}
438
439int os_set_fd_block(int fd, int blocking)
440{
441 int flags;
442
443 flags = fcntl(fd, F_GETFL);
444 if (flags < 0)
445 return -errno;
446
447 if (blocking)
448 flags &= ~O_NONBLOCK;
449 else
450 flags |= O_NONBLOCK;
451
452 if (fcntl(fd, F_SETFL, flags) < 0)
453 return -errno;
454
455 return 0;
456}
457
458int os_accept_connection(int fd)
459{
460 int new;
461
462 new = accept(fd, NULL, 0);
463 if (new < 0)
464 return -errno;
465 return new;
466}
467
468#ifndef SHUT_RD
469#define SHUT_RD 0
470#endif
471
472#ifndef SHUT_WR
473#define SHUT_WR 1
474#endif
475
476#ifndef SHUT_RDWR
477#define SHUT_RDWR 2
478#endif
479
480int os_shutdown_socket(int fd, int r, int w)
481{
482 int what, err;
483
484 if (r && w)
485 what = SHUT_RDWR;
486 else if (r)
487 what = SHUT_RD;
488 else if (w)
489 what = SHUT_WR;
490 else
491 return -EINVAL;
492
493 err = shutdown(fd, what);
494 if (err < 0)
495 return -errno;
496 return 0;
497}
498
499int os_rcv_fd(int fd, int *helper_pid_out)
500{
501 int new, n;
502 char buf[CMSG_SPACE(sizeof(new))];
503 struct msghdr msg;
504 struct cmsghdr *cmsg;
505 struct iovec iov;
506
507 msg.msg_name = NULL;
508 msg.msg_namelen = 0;
509 iov = ((struct iovec) { .iov_base = helper_pid_out,
510 .iov_len = sizeof(*helper_pid_out) });
511 msg.msg_iov = &iov;
512 msg.msg_iovlen = 1;
513 msg.msg_control = buf;
514 msg.msg_controllen = sizeof(buf);
515 msg.msg_flags = 0;
516
517 n = recvmsg(fd, &msg, 0);
518 if (n < 0)
519 return -errno;
520 else if (n != iov.iov_len)
521 *helper_pid_out = -1;
522
523 cmsg = CMSG_FIRSTHDR(&msg);
524 if (cmsg == NULL) {
525 printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
526 "error = %d\n", errno);
527 return -1;
528 }
529 if ((cmsg->cmsg_level != SOL_SOCKET) ||
530 (cmsg->cmsg_type != SCM_RIGHTS)) {
531 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
532 return -1;
533 }
534
535 new = ((int *) CMSG_DATA(cmsg))[0];
536 return new;
537}
538
539int os_create_unix_socket(const char *file, int len, int close_on_exec)
540{
541 struct sockaddr_un addr;
542 int sock, err;
543
544 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
545 if (sock < 0)
546 return -errno;
547
548 if (close_on_exec) {
549 err = os_set_exec_close(sock);
550 if (err < 0)
551 printk(UM_KERN_ERR "create_unix_socket : "
552 "close_on_exec failed, err = %d", -err);
553 }
554
555 addr.sun_family = AF_UNIX;
556
557 snprintf(addr.sun_path, len, "%s", file);
558
559 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
560 if (err < 0)
561 return -errno;
562
563 return sock;
564}
565
566void os_flush_stdout(void)
567{
568 fflush(stdout);
569}
570
571int os_lock_file(int fd, int excl)
572{
573 int type = excl ? F_WRLCK : F_RDLCK;
574 struct flock lock = ((struct flock) { .l_type = type,
575 .l_whence = SEEK_SET,
576 .l_start = 0,
577 .l_len = 0 } );
578 int err, save;
579
580 err = fcntl(fd, F_SETLK, &lock);
581 if (!err)
582 goto out;
583
584 save = -errno;
585 err = fcntl(fd, F_GETLK, &lock);
586 if (err) {
587 err = -errno;
588 goto out;
589 }
590
591 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
592 lock.l_pid);
593 err = save;
594 out:
595 return err;
596}
597
598unsigned os_major(unsigned long long dev)
599{
600 return major(dev);
601}
602
603unsigned os_minor(unsigned long long dev)
604{
605 return minor(dev);
606}
607
608unsigned long long os_makedev(unsigned major, unsigned minor)
609{
610 return makedev(major, minor);
611}
612
