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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 <os.h>
17
18static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
19{
20 *dst = ((struct uml_stat) {
21 .ust_dev = src->st_dev,
22 .ust_ino = src->st_ino,
23 .ust_mode = src->st_mode,
24 .ust_nlink = src->st_nlink,
25 .ust_uid = src->st_uid,
26 .ust_gid = src->st_gid,
27 .ust_size = src->st_size,
28 .ust_blksize = src->st_blksize,
29 .ust_blocks = src->st_blocks,
30 .ust_atime = src->st_atime,
31 .ust_mtime = src->st_mtime,
32 .ust_ctime = src->st_ctime,
33 });
34}
35
36int 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
50int 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
64int 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
81int 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
93int os_get_ifname(int fd, char* namebuf)
94{
95 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
96 return -errno;
97
98 return 0;
99}
100
101int 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
116int 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
127int 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
151int 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
172int 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
208int 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
230out_close:
231 close(fd);
232out:
233 return err;
234}
235
236void os_close_file(int fd)
237{
238 close(fd);
239}
240int os_fsync_file(int fd)
241{
242 if (fsync(fd) < 0)
243 return -errno;
244 return 0;
245}
246
247int 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
257int 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
266int 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
275int os_sync_file(int fd)
276{
277 int n = fsync(fd);
278
279 if (n < 0)
280 return -errno;
281 return n;
282}
283
284int 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
322int 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
338int 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
349int 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
378int 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
405int 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
419int 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
438int 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
460int 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
479int 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
519int 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
546void os_flush_stdout(void)
547{
548 fflush(stdout);
549}
550
551int 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
578unsigned os_major(unsigned long long dev)
579{
580 return major(dev);
581}
582
583unsigned os_minor(unsigned long long dev)
584{
585 return minor(dev);
586}
587
588unsigned long long os_makedev(unsigned major, unsigned minor)
589{
590 return makedev(major, minor);
591}
592
