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