Commit | Line | Data |
---|---|---|
108ffa8c | 1 | /* |
1da177e4 LT |
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 | ||
9ead6fee | 45 | CATCH_EINTR(err = fstat64(fd, &sbuf)); |
1da177e4 | 46 | if(err < 0) |
108ffa8c | 47 | return -errno; |
1da177e4 LT |
48 | |
49 | if(ubuf != NULL) | |
50 | copy_stat(ubuf, &sbuf); | |
108ffa8c | 51 | return err; |
1da177e4 LT |
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) | |
108ffa8c | 64 | return -errno; |
1da177e4 LT |
65 | |
66 | if(ubuf != NULL) | |
67 | copy_stat(ubuf, &sbuf); | |
108ffa8c | 68 | return err; |
1da177e4 LT |
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) | |
108ffa8c | 80 | return -errno; |
1da177e4 | 81 | |
108ffa8c | 82 | return 0; |
1da177e4 LT |
83 | } |
84 | ||
1da177e4 LT |
85 | /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ |
86 | int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) | |
87 | { | |
88 | int err; | |
89 | ||
90 | err = ioctl(fd, cmd, arg); | |
91 | if(err < 0) | |
108ffa8c | 92 | return -errno; |
1da177e4 | 93 | |
108ffa8c | 94 | return err; |
1da177e4 LT |
95 | } |
96 | ||
1da177e4 LT |
97 | /* FIXME: ensure namebuf in os_get_if_name is big enough */ |
98 | int os_get_ifname(int fd, char* namebuf) | |
99 | { | |
100 | if(ioctl(fd, SIOCGIFNAME, namebuf) < 0) | |
108ffa8c | 101 | return -errno; |
1da177e4 | 102 | |
108ffa8c | 103 | return 0; |
1da177e4 LT |
104 | } |
105 | ||
106 | int os_set_slip(int fd) | |
107 | { | |
108 | int disc, sencap; | |
109 | ||
110 | disc = N_SLIP; | |
b4fd310e JD |
111 | if(ioctl(fd, TIOCSETD, &disc) < 0) |
112 | return -errno; | |
1da177e4 LT |
113 | |
114 | sencap = 0; | |
b4fd310e JD |
115 | if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0) |
116 | return -errno; | |
1da177e4 | 117 | |
108ffa8c | 118 | return 0; |
1da177e4 LT |
119 | } |
120 | ||
121 | int os_set_owner(int fd, int pid) | |
122 | { | |
123 | if(fcntl(fd, F_SETOWN, pid) < 0){ | |
124 | int save_errno = errno; | |
125 | ||
126 | if(fcntl(fd, F_GETOWN, 0) != pid) | |
108ffa8c | 127 | return -save_errno; |
1da177e4 LT |
128 | } |
129 | ||
108ffa8c | 130 | return 0; |
1da177e4 LT |
131 | } |
132 | ||
1da177e4 LT |
133 | int os_mode_fd(int fd, int mode) |
134 | { | |
135 | int err; | |
136 | ||
137 | do { | |
138 | err = fchmod(fd, mode); | |
139 | } while((err < 0) && (errno==EINTR)) ; | |
140 | ||
141 | if(err < 0) | |
108ffa8c | 142 | return -errno; |
1da177e4 | 143 | |
108ffa8c | 144 | return 0; |
1da177e4 LT |
145 | } |
146 | ||
147 | int os_file_type(char *file) | |
148 | { | |
149 | struct uml_stat buf; | |
150 | int err; | |
151 | ||
152 | err = os_stat_file(file, &buf); | |
153 | if(err < 0) | |
108ffa8c | 154 | return err; |
1da177e4 | 155 | |
108ffa8c JD |
156 | if(S_ISDIR(buf.ust_mode)) |
157 | return OS_TYPE_DIR; | |
158 | else if(S_ISLNK(buf.ust_mode)) | |
159 | return OS_TYPE_SYMLINK; | |
160 | else if(S_ISCHR(buf.ust_mode)) | |
161 | return OS_TYPE_CHARDEV; | |
162 | else if(S_ISBLK(buf.ust_mode)) | |
163 | return OS_TYPE_BLOCKDEV; | |
164 | else if(S_ISFIFO(buf.ust_mode)) | |
165 | return OS_TYPE_FIFO; | |
166 | else if(S_ISSOCK(buf.ust_mode)) | |
167 | return OS_TYPE_SOCK; | |
168 | else return OS_TYPE_FILE; | |
1da177e4 LT |
169 | } |
170 | ||
171 | int os_file_mode(char *file, struct openflags *mode_out) | |
172 | { | |
173 | int err; | |
174 | ||
175 | *mode_out = OPENFLAGS(); | |
176 | ||
512b6fb1 JD |
177 | err = access(file, W_OK); |
178 | if(err && (errno != EACCES)) | |
179 | return -errno; | |
180 | else if(!err) | |
181 | *mode_out = of_write(*mode_out); | |
1da177e4 | 182 | |
512b6fb1 JD |
183 | err = access(file, R_OK); |
184 | if(err && (errno != EACCES)) | |
185 | return -errno; | |
186 | else if(!err) | |
187 | *mode_out = of_read(*mode_out); | |
1da177e4 | 188 | |
512b6fb1 | 189 | return err; |
1da177e4 LT |
190 | } |
191 | ||
192 | int os_open_file(char *file, struct openflags flags, int mode) | |
193 | { | |
b4fd310e | 194 | int fd, err, f = 0; |
1da177e4 LT |
195 | |
196 | if(flags.r && flags.w) f = O_RDWR; | |
197 | else if(flags.r) f = O_RDONLY; | |
198 | else if(flags.w) f = O_WRONLY; | |
199 | else f = 0; | |
200 | ||
201 | if(flags.s) f |= O_SYNC; | |
202 | if(flags.c) f |= O_CREAT; | |
203 | if(flags.t) f |= O_TRUNC; | |
204 | if(flags.e) f |= O_EXCL; | |
205 | ||
206 | fd = open64(file, f, mode); | |
207 | if(fd < 0) | |
512b6fb1 | 208 | return -errno; |
1da177e4 LT |
209 | |
210 | if(flags.cl && fcntl(fd, F_SETFD, 1)){ | |
b4fd310e | 211 | err = -errno; |
512b6fb1 | 212 | close(fd); |
b4fd310e | 213 | return err; |
1da177e4 LT |
214 | } |
215 | ||
512b6fb1 | 216 | return fd; |
1da177e4 LT |
217 | } |
218 | ||
219 | int os_connect_socket(char *name) | |
220 | { | |
221 | struct sockaddr_un sock; | |
222 | int fd, err; | |
223 | ||
224 | sock.sun_family = AF_UNIX; | |
225 | snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); | |
226 | ||
227 | fd = socket(AF_UNIX, SOCK_STREAM, 0); | |
dc1561ac PBG |
228 | if(fd < 0) { |
229 | err = -errno; | |
230 | goto out; | |
231 | } | |
1da177e4 LT |
232 | |
233 | err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); | |
dc1561ac PBG |
234 | if(err) { |
235 | err = -errno; | |
236 | goto out_close; | |
237 | } | |
1da177e4 | 238 | |
dc1561ac PBG |
239 | return fd; |
240 | ||
241 | out_close: | |
242 | close(fd); | |
243 | out: | |
244 | return err; | |
1da177e4 LT |
245 | } |
246 | ||
247 | void os_close_file(int fd) | |
248 | { | |
249 | close(fd); | |
250 | } | |
251 | ||
ba180fd4 | 252 | int os_seek_file(int fd, unsigned long long offset) |
1da177e4 | 253 | { |
ba180fd4 | 254 | unsigned long long actual; |
1da177e4 LT |
255 | |
256 | actual = lseek64(fd, offset, SEEK_SET); | |
257 | if(actual != offset) | |
108ffa8c JD |
258 | return -errno; |
259 | return 0; | |
1da177e4 LT |
260 | } |
261 | ||
1da177e4 | 262 | int os_read_file(int fd, void *buf, int len) |
3d564047 JD |
263 | { |
264 | int n = read(fd, buf, len); | |
265 | ||
266 | if(n < 0) | |
267 | return -errno; | |
268 | return n; | |
269 | } | |
270 | ||
1da177e4 | 271 | int os_write_file(int fd, const void *buf, int len) |
3d564047 JD |
272 | { |
273 | int n = write(fd, (void *) buf, len); | |
274 | ||
275 | if(n < 0) | |
276 | return -errno; | |
277 | return n; | |
278 | } | |
279 | ||
da00d9a5 | 280 | int os_file_size(char *file, unsigned long long *size_out) |
1da177e4 LT |
281 | { |
282 | struct uml_stat buf; | |
283 | int err; | |
284 | ||
285 | err = os_stat_file(file, &buf); | |
286 | if(err < 0){ | |
287 | printk("Couldn't stat \"%s\" : err = %d\n", file, -err); | |
512b6fb1 | 288 | return err; |
1da177e4 LT |
289 | } |
290 | ||
291 | if(S_ISBLK(buf.ust_mode)){ | |
2c392a4f NG |
292 | int fd; |
293 | long blocks; | |
1da177e4 | 294 | |
512b6fb1 JD |
295 | fd = open(file, O_RDONLY, 0); |
296 | if(fd < 0) { | |
297 | err = -errno; | |
298 | printk("Couldn't open \"%s\", errno = %d\n", file, | |
299 | errno); | |
300 | return err; | |
1da177e4 LT |
301 | } |
302 | if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ | |
b4fd310e | 303 | err = -errno; |
1da177e4 LT |
304 | printk("Couldn't get the block size of \"%s\", " |
305 | "errno = %d\n", file, errno); | |
512b6fb1 JD |
306 | close(fd); |
307 | return err; | |
1da177e4 LT |
308 | } |
309 | *size_out = ((long long) blocks) * 512; | |
512b6fb1 | 310 | close(fd); |
1da177e4 | 311 | } |
512b6fb1 JD |
312 | else *size_out = buf.ust_size; |
313 | ||
314 | return 0; | |
1da177e4 LT |
315 | } |
316 | ||
317 | int os_file_modtime(char *file, unsigned long *modtime) | |
318 | { | |
319 | struct uml_stat buf; | |
320 | int err; | |
321 | ||
322 | err = os_stat_file(file, &buf); | |
323 | if(err < 0){ | |
324 | printk("Couldn't stat \"%s\" : err = %d\n", file, -err); | |
108ffa8c | 325 | return err; |
1da177e4 LT |
326 | } |
327 | ||
328 | *modtime = buf.ust_mtime; | |
108ffa8c | 329 | return 0; |
1da177e4 LT |
330 | } |
331 | ||
512b6fb1 | 332 | int os_get_exec_close(int fd, int *close_on_exec) |
1da177e4 LT |
333 | { |
334 | int ret; | |
335 | ||
512b6fb1 | 336 | CATCH_EINTR(ret = fcntl(fd, F_GETFD)); |
1da177e4 LT |
337 | |
338 | if(ret < 0) | |
512b6fb1 | 339 | return -errno; |
1da177e4 | 340 | |
512b6fb1 JD |
341 | *close_on_exec = (ret & FD_CLOEXEC) ? 1 : 0; |
342 | return ret; | |
1da177e4 LT |
343 | } |
344 | ||
512b6fb1 | 345 | int os_set_exec_close(int fd) |
1da177e4 | 346 | { |
512b6fb1 | 347 | int err; |
1da177e4 | 348 | |
512b6fb1 | 349 | CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); |
1da177e4 LT |
350 | |
351 | if(err < 0) | |
512b6fb1 JD |
352 | return -errno; |
353 | return err; | |
1da177e4 LT |
354 | } |
355 | ||
356 | int os_pipe(int *fds, int stream, int close_on_exec) | |
357 | { | |
358 | int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; | |
359 | ||
360 | err = socketpair(AF_UNIX, type, 0, fds); | |
361 | if(err < 0) | |
512b6fb1 | 362 | return -errno; |
1da177e4 LT |
363 | |
364 | if(!close_on_exec) | |
512b6fb1 | 365 | return 0; |
1da177e4 | 366 | |
512b6fb1 | 367 | err = os_set_exec_close(fds[0]); |
1da177e4 LT |
368 | if(err < 0) |
369 | goto error; | |
370 | ||
512b6fb1 | 371 | err = os_set_exec_close(fds[1]); |
1da177e4 LT |
372 | if(err < 0) |
373 | goto error; | |
374 | ||
108ffa8c | 375 | return 0; |
1da177e4 LT |
376 | |
377 | error: | |
378 | printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); | |
512b6fb1 JD |
379 | close(fds[1]); |
380 | close(fds[0]); | |
381 | return err; | |
1da177e4 LT |
382 | } |
383 | ||
384 | int os_set_fd_async(int fd, int owner) | |
385 | { | |
b4fd310e JD |
386 | int err; |
387 | ||
1da177e4 LT |
388 | /* XXX This should do F_GETFL first */ |
389 | if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ | |
b4fd310e | 390 | err = -errno; |
1da177e4 LT |
391 | printk("os_set_fd_async : failed to set O_ASYNC and " |
392 | "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); | |
b4fd310e | 393 | return err; |
1da177e4 LT |
394 | } |
395 | #ifdef notdef | |
396 | if(fcntl(fd, F_SETFD, 1) < 0){ | |
397 | printk("os_set_fd_async : Setting FD_CLOEXEC failed, " | |
398 | "errno = %d\n", errno); | |
399 | } | |
400 | #endif | |
401 | ||
402 | if((fcntl(fd, F_SETSIG, SIGIO) < 0) || | |
403 | (fcntl(fd, F_SETOWN, owner) < 0)){ | |
b4fd310e | 404 | err = -errno; |
1da177e4 | 405 | printk("os_set_fd_async : Failed to fcntl F_SETOWN " |
108ffa8c | 406 | "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, |
1da177e4 | 407 | owner, errno); |
b4fd310e | 408 | return err; |
1da177e4 LT |
409 | } |
410 | ||
108ffa8c | 411 | return 0; |
1da177e4 LT |
412 | } |
413 | ||
414 | int os_clear_fd_async(int fd) | |
415 | { | |
416 | int flags = fcntl(fd, F_GETFL); | |
417 | ||
418 | flags &= ~(O_ASYNC | O_NONBLOCK); | |
419 | if(fcntl(fd, F_SETFL, flags) < 0) | |
108ffa8c JD |
420 | return -errno; |
421 | return 0; | |
1da177e4 LT |
422 | } |
423 | ||
424 | int os_set_fd_block(int fd, int blocking) | |
425 | { | |
426 | int flags; | |
427 | ||
428 | flags = fcntl(fd, F_GETFL); | |
429 | ||
430 | if(blocking) flags &= ~O_NONBLOCK; | |
431 | else flags |= O_NONBLOCK; | |
432 | ||
b4fd310e JD |
433 | if(fcntl(fd, F_SETFL, flags) < 0) |
434 | return -errno; | |
435 | ||
108ffa8c | 436 | return 0; |
1da177e4 LT |
437 | } |
438 | ||
439 | int os_accept_connection(int fd) | |
440 | { | |
441 | int new; | |
442 | ||
443 | new = accept(fd, NULL, 0); | |
108ffa8c JD |
444 | if(new < 0) |
445 | return -errno; | |
446 | return new; | |
1da177e4 LT |
447 | } |
448 | ||
449 | #ifndef SHUT_RD | |
450 | #define SHUT_RD 0 | |
451 | #endif | |
452 | ||
453 | #ifndef SHUT_WR | |
454 | #define SHUT_WR 1 | |
455 | #endif | |
456 | ||
457 | #ifndef SHUT_RDWR | |
458 | #define SHUT_RDWR 2 | |
459 | #endif | |
460 | ||
461 | int os_shutdown_socket(int fd, int r, int w) | |
462 | { | |
463 | int what, err; | |
464 | ||
465 | if(r && w) what = SHUT_RDWR; | |
466 | else if(r) what = SHUT_RD; | |
467 | else if(w) what = SHUT_WR; | |
468 | else { | |
469 | printk("os_shutdown_socket : neither r or w was set\n"); | |
108ffa8c | 470 | return -EINVAL; |
1da177e4 LT |
471 | } |
472 | err = shutdown(fd, what); | |
473 | if(err < 0) | |
108ffa8c JD |
474 | return -errno; |
475 | return 0; | |
1da177e4 LT |
476 | } |
477 | ||
478 | int os_rcv_fd(int fd, int *helper_pid_out) | |
479 | { | |
480 | int new, n; | |
481 | char buf[CMSG_SPACE(sizeof(new))]; | |
482 | struct msghdr msg; | |
483 | struct cmsghdr *cmsg; | |
484 | struct iovec iov; | |
485 | ||
486 | msg.msg_name = NULL; | |
487 | msg.msg_namelen = 0; | |
488 | iov = ((struct iovec) { .iov_base = helper_pid_out, | |
489 | .iov_len = sizeof(*helper_pid_out) }); | |
490 | msg.msg_iov = &iov; | |
491 | msg.msg_iovlen = 1; | |
492 | msg.msg_control = buf; | |
493 | msg.msg_controllen = sizeof(buf); | |
494 | msg.msg_flags = 0; | |
495 | ||
496 | n = recvmsg(fd, &msg, 0); | |
497 | if(n < 0) | |
108ffa8c | 498 | return -errno; |
d4d5d205 | 499 | else if(n != iov.iov_len) |
1da177e4 LT |
500 | *helper_pid_out = -1; |
501 | ||
502 | cmsg = CMSG_FIRSTHDR(&msg); | |
503 | if(cmsg == NULL){ | |
504 | printk("rcv_fd didn't receive anything, error = %d\n", errno); | |
108ffa8c | 505 | return -1; |
1da177e4 | 506 | } |
108ffa8c | 507 | if((cmsg->cmsg_level != SOL_SOCKET) || |
1da177e4 LT |
508 | (cmsg->cmsg_type != SCM_RIGHTS)){ |
509 | printk("rcv_fd didn't receive a descriptor\n"); | |
108ffa8c | 510 | return -1; |
1da177e4 LT |
511 | } |
512 | ||
513 | new = ((int *) CMSG_DATA(cmsg))[0]; | |
108ffa8c | 514 | return new; |
1da177e4 LT |
515 | } |
516 | ||
517 | int os_create_unix_socket(char *file, int len, int close_on_exec) | |
518 | { | |
519 | struct sockaddr_un addr; | |
520 | int sock, err; | |
521 | ||
522 | sock = socket(PF_UNIX, SOCK_DGRAM, 0); | |
b4fd310e JD |
523 | if(sock < 0) |
524 | return -errno; | |
1da177e4 LT |
525 | |
526 | if(close_on_exec) { | |
512b6fb1 | 527 | err = os_set_exec_close(sock); |
1da177e4 LT |
528 | if(err < 0) |
529 | printk("create_unix_socket : close_on_exec failed, " | |
530 | "err = %d", -err); | |
531 | } | |
532 | ||
533 | addr.sun_family = AF_UNIX; | |
534 | ||
535 | /* XXX Be more careful about overflow */ | |
536 | snprintf(addr.sun_path, len, "%s", file); | |
537 | ||
538 | err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); | |
b4fd310e JD |
539 | if(err < 0) |
540 | return -errno; | |
1da177e4 | 541 | |
108ffa8c | 542 | return sock; |
1da177e4 LT |
543 | } |
544 | ||
545 | void os_flush_stdout(void) | |
546 | { | |
547 | fflush(stdout); | |
548 | } | |
549 | ||
550 | int os_lock_file(int fd, int excl) | |
551 | { | |
552 | int type = excl ? F_WRLCK : F_RDLCK; | |
553 | struct flock lock = ((struct flock) { .l_type = type, | |
554 | .l_whence = SEEK_SET, | |
555 | .l_start = 0, | |
556 | .l_len = 0 } ); | |
557 | int err, save; | |
558 | ||
559 | err = fcntl(fd, F_SETLK, &lock); | |
560 | if(!err) | |
561 | goto out; | |
562 | ||
563 | save = -errno; | |
564 | err = fcntl(fd, F_GETLK, &lock); | |
565 | if(err){ | |
566 | err = -errno; | |
567 | goto out; | |
568 | } | |
569 | ||
570 | printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); | |
571 | err = save; | |
572 | out: | |
108ffa8c | 573 | return err; |
1da177e4 | 574 | } |