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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6#include <stdio.h>
7#include <unistd.h>
8#include <stdlib.h>
9#include <string.h>
10#include <errno.h>
11#include <fcntl.h>
12#include <signal.h>
13#include <linux/falloc.h>
14#include <sys/ioctl.h>
15#include <sys/mount.h>
16#include <sys/socket.h>
17#include <sys/stat.h>
18#include <sys/sysmacros.h>
19#include <sys/un.h>
20#include <sys/mman.h>
21#include <sys/types.h>
22#include <sys/eventfd.h>
23#include <poll.h>
24#include <os.h>
25
26static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
27{
28 *dst = ((struct uml_stat) {
29 .ust_dev = src->st_dev, /* device */
30 .ust_ino = src->st_ino, /* inode */
31 .ust_mode = src->st_mode, /* protection */
32 .ust_nlink = src->st_nlink, /* number of hard links */
33 .ust_uid = src->st_uid, /* user ID of owner */
34 .ust_gid = src->st_gid, /* group ID of owner */
35 .ust_size = src->st_size, /* total size, in bytes */
36 .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
37 .ust_blocks = src->st_blocks, /* number of blocks allocated */
38 .ust_atime = src->st_atime, /* time of last access */
39 .ust_mtime = src->st_mtime, /* time of last modification */
40 .ust_ctime = src->st_ctime, /* time of last change */
41 });
42}
43
44int os_stat_fd(const int fd, struct uml_stat *ubuf)
45{
46 struct stat64 sbuf;
47 int err;
48
49 CATCH_EINTR(err = fstat64(fd, &sbuf));
50 if (err < 0)
51 return -errno;
52
53 if (ubuf != NULL)
54 copy_stat(ubuf, &sbuf);
55 return err;
56}
57
58int os_stat_file(const char *file_name, struct uml_stat *ubuf)
59{
60 struct stat64 sbuf;
61 int err;
62
63 CATCH_EINTR(err = stat64(file_name, &sbuf));
64 if (err < 0)
65 return -errno;
66
67 if (ubuf != NULL)
68 copy_stat(ubuf, &sbuf);
69 return err;
70}
71
72int os_access(const char *file, int mode)
73{
74 int amode, err;
75
76 amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
77 (mode & OS_ACC_W_OK ? W_OK : 0) |
78 (mode & OS_ACC_X_OK ? X_OK : 0) |
79 (mode & OS_ACC_F_OK ? F_OK : 0);
80
81 err = access(file, amode);
82 if (err < 0)
83 return -errno;
84
85 return 0;
86}
87
88/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
89int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
90{
91 int err;
92
93 err = ioctl(fd, cmd, arg);
94 if (err < 0)
95 return -errno;
96
97 return err;
98}
99
100/* FIXME: ensure namebuf in os_get_if_name is big enough */
101int os_get_ifname(int fd, char* namebuf)
102{
103 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
104 return -errno;
105
106 return 0;
107}
108
109int os_set_slip(int fd)
110{
111 int disc, sencap;
112
113 disc = N_SLIP;
114 if (ioctl(fd, TIOCSETD, &disc) < 0)
115 return -errno;
116
117 sencap = 0;
118 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
119 return -errno;
120
121 return 0;
122}
123
124int os_mode_fd(int fd, int mode)
125{
126 int err;
127
128 CATCH_EINTR(err = fchmod(fd, mode));
129 if (err < 0)
130 return -errno;
131
132 return 0;
133}
134
135int os_file_type(char *file)
136{
137 struct uml_stat buf;
138 int err;
139
140 err = os_stat_file(file, &buf);
141 if (err < 0)
142 return err;
143
144 if (S_ISDIR(buf.ust_mode))
145 return OS_TYPE_DIR;
146 else if (S_ISLNK(buf.ust_mode))
147 return OS_TYPE_SYMLINK;
148 else if (S_ISCHR(buf.ust_mode))
149 return OS_TYPE_CHARDEV;
150 else if (S_ISBLK(buf.ust_mode))
151 return OS_TYPE_BLOCKDEV;
152 else if (S_ISFIFO(buf.ust_mode))
153 return OS_TYPE_FIFO;
154 else if (S_ISSOCK(buf.ust_mode))
155 return OS_TYPE_SOCK;
156 else return OS_TYPE_FILE;
157}
158
159int os_file_mode(const char *file, struct openflags *mode_out)
160{
161 int err;
162
163 *mode_out = OPENFLAGS();
164
165 err = access(file, W_OK);
166 if (err && (errno != EACCES))
167 return -errno;
168 else if (!err)
169 *mode_out = of_write(*mode_out);
170
171 err = access(file, R_OK);
172 if (err && (errno != EACCES))
173 return -errno;
174 else if (!err)
175 *mode_out = of_read(*mode_out);
176
177 return err;
178}
179
180int os_open_file(const char *file, struct openflags flags, int mode)
181{
182 int fd, err, f = 0;
183
184 if (flags.r && flags.w)
185 f = O_RDWR;
186 else if (flags.r)
187 f = O_RDONLY;
188 else if (flags.w)
189 f = O_WRONLY;
190 else f = 0;
191
192 if (flags.s)
193 f |= O_SYNC;
194 if (flags.c)
195 f |= O_CREAT;
196 if (flags.t)
197 f |= O_TRUNC;
198 if (flags.e)
199 f |= O_EXCL;
200 if (flags.a)
201 f |= O_APPEND;
202
203 fd = open64(file, f, mode);
204 if (fd < 0)
205 return -errno;
206
207 if (flags.cl && fcntl(fd, F_SETFD, 1)) {
208 err = -errno;
209 close(fd);
210 return err;
211 }
212
213 return fd;
214}
215
216int os_connect_socket(const char *name)
217{
218 struct sockaddr_un sock;
219 int fd, err;
220
221 sock.sun_family = AF_UNIX;
222 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
223
224 fd = socket(AF_UNIX, SOCK_STREAM, 0);
225 if (fd < 0) {
226 err = -errno;
227 goto out;
228 }
229
230 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
231 if (err) {
232 err = -errno;
233 goto out_close;
234 }
235
236 return fd;
237
238out_close:
239 close(fd);
240out:
241 return err;
242}
243
244int os_dup_file(int fd)
245{
246 int new_fd = dup(fd);
247
248 if (new_fd < 0)
249 return -errno;
250
251 return new_fd;
252}
253
254void os_close_file(int fd)
255{
256 close(fd);
257}
258
259int os_seek_file(int fd, unsigned long long offset)
260{
261 unsigned long long actual;
262
263 actual = lseek64(fd, offset, SEEK_SET);
264 if (actual != offset)
265 return -errno;
266 return 0;
267}
268
269int os_read_file(int fd, void *buf, int len)
270{
271 int n = read(fd, buf, len);
272
273 if (n < 0)
274 return -errno;
275 return n;
276}
277
278int os_pread_file(int fd, void *buf, int len, unsigned long long offset)
279{
280 int n = pread(fd, buf, len, offset);
281
282 if (n < 0)
283 return -errno;
284 return n;
285}
286
287int os_write_file(int fd, const void *buf, int len)
288{
289 int n = write(fd, (void *) buf, len);
290
291 if (n < 0)
292 return -errno;
293 return n;
294}
295
296int os_sync_file(int fd)
297{
298 int n = fdatasync(fd);
299
300 if (n < 0)
301 return -errno;
302 return n;
303}
304
305int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset)
306{
307 int n = pwrite(fd, (void *) buf, len, offset);
308
309 if (n < 0)
310 return -errno;
311 return n;
312}
313
314
315int os_file_size(const char *file, unsigned long long *size_out)
316{
317 struct uml_stat buf;
318 int err;
319
320 err = os_stat_file(file, &buf);
321 if (err < 0) {
322 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
323 -err);
324 return err;
325 }
326
327 if (S_ISBLK(buf.ust_mode)) {
328 int fd;
329 long blocks;
330
331 fd = open(file, O_RDONLY, 0);
332 if (fd < 0) {
333 err = -errno;
334 printk(UM_KERN_ERR "Couldn't open \"%s\", "
335 "errno = %d\n", file, errno);
336 return err;
337 }
338 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
339 err = -errno;
340 printk(UM_KERN_ERR "Couldn't get the block size of "
341 "\"%s\", errno = %d\n", file, errno);
342 close(fd);
343 return err;
344 }
345 *size_out = ((long long) blocks) * 512;
346 close(fd);
347 }
348 else *size_out = buf.ust_size;
349
350 return 0;
351}
352
353int os_file_modtime(const char *file, long long *modtime)
354{
355 struct uml_stat buf;
356 int err;
357
358 err = os_stat_file(file, &buf);
359 if (err < 0) {
360 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
361 -err);
362 return err;
363 }
364
365 *modtime = buf.ust_mtime;
366 return 0;
367}
368
369int os_set_exec_close(int fd)
370{
371 int err;
372
373 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
374
375 if (err < 0)
376 return -errno;
377 return err;
378}
379
380int os_pipe(int *fds, int stream, int close_on_exec)
381{
382 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
383
384 err = socketpair(AF_UNIX, type, 0, fds);
385 if (err < 0)
386 return -errno;
387
388 if (!close_on_exec)
389 return 0;
390
391 err = os_set_exec_close(fds[0]);
392 if (err < 0)
393 goto error;
394
395 err = os_set_exec_close(fds[1]);
396 if (err < 0)
397 goto error;
398
399 return 0;
400
401 error:
402 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
403 -err);
404 close(fds[1]);
405 close(fds[0]);
406 return err;
407}
408
409int os_set_fd_async(int fd)
410{
411 int err, flags;
412
413 flags = fcntl(fd, F_GETFL);
414 if (flags < 0)
415 return -errno;
416
417 flags |= O_ASYNC | O_NONBLOCK;
418 if (fcntl(fd, F_SETFL, flags) < 0) {
419 err = -errno;
420 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
421 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
422 return err;
423 }
424
425 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
426 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
427 err = -errno;
428 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
429 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
430 return err;
431 }
432
433 return 0;
434}
435
436int os_clear_fd_async(int fd)
437{
438 int flags;
439
440 flags = fcntl(fd, F_GETFL);
441 if (flags < 0)
442 return -errno;
443
444 flags &= ~(O_ASYNC | O_NONBLOCK);
445 if (fcntl(fd, F_SETFL, flags) < 0)
446 return -errno;
447 return 0;
448}
449
450int os_set_fd_block(int fd, int blocking)
451{
452 int flags;
453
454 flags = fcntl(fd, F_GETFL);
455 if (flags < 0)
456 return -errno;
457
458 if (blocking)
459 flags &= ~O_NONBLOCK;
460 else
461 flags |= O_NONBLOCK;
462
463 if (fcntl(fd, F_SETFL, flags) < 0)
464 return -errno;
465
466 return 0;
467}
468
469int os_accept_connection(int fd)
470{
471 int new;
472
473 new = accept(fd, NULL, 0);
474 if (new < 0)
475 return -errno;
476 return new;
477}
478
479#ifndef SHUT_RD
480#define SHUT_RD 0
481#endif
482
483#ifndef SHUT_WR
484#define SHUT_WR 1
485#endif
486
487#ifndef SHUT_RDWR
488#define SHUT_RDWR 2
489#endif
490
491int os_shutdown_socket(int fd, int r, int w)
492{
493 int what, err;
494
495 if (r && w)
496 what = SHUT_RDWR;
497 else if (r)
498 what = SHUT_RD;
499 else if (w)
500 what = SHUT_WR;
501 else
502 return -EINVAL;
503
504 err = shutdown(fd, what);
505 if (err < 0)
506 return -errno;
507 return 0;
508}
509
510/**
511 * os_rcv_fd_msg - receive message with (optional) FDs
512 * @fd: the FD to receive from
513 * @fds: the array for FDs to write to
514 * @n_fds: number of FDs to receive (@fds array size)
515 * @data: the message buffer
516 * @data_len: the size of the message to receive
517 *
518 * Receive a message with FDs.
519 *
520 * Returns: the size of the received message, or an error code
521 */
522ssize_t os_rcv_fd_msg(int fd, int *fds, unsigned int n_fds,
523 void *data, size_t data_len)
524{
525#define MAX_RCV_FDS 2
526 char buf[CMSG_SPACE(sizeof(*fds) * MAX_RCV_FDS)];
527 struct cmsghdr *cmsg;
528 struct iovec iov = {
529 .iov_base = data,
530 .iov_len = data_len,
531 };
532 struct msghdr msg = {
533 .msg_iov = &iov,
534 .msg_iovlen = 1,
535 .msg_control = buf,
536 .msg_controllen = CMSG_SPACE(sizeof(*fds) * n_fds),
537 };
538 int n;
539
540 if (n_fds > MAX_RCV_FDS)
541 return -EINVAL;
542
543 n = recvmsg(fd, &msg, 0);
544 if (n < 0)
545 return -errno;
546
547 cmsg = CMSG_FIRSTHDR(&msg);
548 if (!cmsg ||
549 cmsg->cmsg_level != SOL_SOCKET ||
550 cmsg->cmsg_type != SCM_RIGHTS)
551 return n;
552
553 memcpy(fds, CMSG_DATA(cmsg), cmsg->cmsg_len);
554 return n;
555}
556
557int os_create_unix_socket(const char *file, int len, int close_on_exec)
558{
559 struct sockaddr_un addr;
560 int sock, err;
561
562 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
563 if (sock < 0)
564 return -errno;
565
566 if (close_on_exec) {
567 err = os_set_exec_close(sock);
568 if (err < 0)
569 printk(UM_KERN_ERR "create_unix_socket : "
570 "close_on_exec failed, err = %d", -err);
571 }
572
573 addr.sun_family = AF_UNIX;
574
575 snprintf(addr.sun_path, len, "%s", file);
576
577 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
578 if (err < 0)
579 return -errno;
580
581 return sock;
582}
583
584void os_flush_stdout(void)
585{
586 fflush(stdout);
587}
588
589int os_lock_file(int fd, int excl)
590{
591 int type = excl ? F_WRLCK : F_RDLCK;
592 struct flock lock = ((struct flock) { .l_type = type,
593 .l_whence = SEEK_SET,
594 .l_start = 0,
595 .l_len = 0 } );
596 int err, save;
597
598 err = fcntl(fd, F_SETLK, &lock);
599 if (!err)
600 goto out;
601
602 save = -errno;
603 err = fcntl(fd, F_GETLK, &lock);
604 if (err) {
605 err = -errno;
606 goto out;
607 }
608
609 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
610 lock.l_pid);
611 err = save;
612 out:
613 return err;
614}
615
616unsigned os_major(unsigned long long dev)
617{
618 return major(dev);
619}
620
621unsigned os_minor(unsigned long long dev)
622{
623 return minor(dev);
624}
625
626unsigned long long os_makedev(unsigned major, unsigned minor)
627{
628 return makedev(major, minor);
629}
630
631int os_falloc_punch(int fd, unsigned long long offset, int len)
632{
633 int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
634
635 if (n < 0)
636 return -errno;
637 return n;
638}
639
640int os_falloc_zeroes(int fd, unsigned long long offset, int len)
641{
642 int n = fallocate(fd, FALLOC_FL_ZERO_RANGE|FALLOC_FL_KEEP_SIZE, offset, len);
643
644 if (n < 0)
645 return -errno;
646 return n;
647}
648
649int os_eventfd(unsigned int initval, int flags)
650{
651 int fd = eventfd(initval, flags);
652
653 if (fd < 0)
654 return -errno;
655 return fd;
656}
657
658int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds,
659 unsigned int fds_num)
660{
661 struct iovec iov = {
662 .iov_base = (void *) buf,
663 .iov_len = len,
664 };
665 union {
666 char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)];
667 struct cmsghdr align;
668 } u;
669 unsigned int fds_size = sizeof(*fds) * fds_num;
670 struct msghdr msg = {
671 .msg_iov = &iov,
672 .msg_iovlen = 1,
673 .msg_control = u.control,
674 .msg_controllen = CMSG_SPACE(fds_size),
675 };
676 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
677 int err;
678
679 if (fds_num > OS_SENDMSG_MAX_FDS)
680 return -EINVAL;
681 memset(u.control, 0, sizeof(u.control));
682 cmsg->cmsg_level = SOL_SOCKET;
683 cmsg->cmsg_type = SCM_RIGHTS;
684 cmsg->cmsg_len = CMSG_LEN(fds_size);
685 memcpy(CMSG_DATA(cmsg), fds, fds_size);
686 err = sendmsg(fd, &msg, 0);
687
688 if (err < 0)
689 return -errno;
690 return err;
691}
692
693int os_poll(unsigned int n, const int *fds)
694{
695 /* currently need 2 FDs at most so avoid dynamic allocation */
696 struct pollfd pollfds[2] = {};
697 unsigned int i;
698 int ret;
699
700 if (n > ARRAY_SIZE(pollfds))
701 return -EINVAL;
702
703 for (i = 0; i < n; i++) {
704 pollfds[i].fd = fds[i];
705 pollfds[i].events = POLLIN;
706 }
707
708 ret = poll(pollfds, n, -1);
709 if (ret < 0)
710 return -errno;
711
712 /* Return the index of the available FD */
713 for (i = 0; i < n; i++) {
714 if (pollfds[i].revents)
715 return i;
716 }
717
718 return -EIO;
719}
720
721void *os_mmap_rw_shared(int fd, size_t size)
722{
723 void *res = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
724
725 if (res == MAP_FAILED)
726 return NULL;
727
728 return res;
729}
730
731void *os_mremap_rw_shared(void *old_addr, size_t old_size, size_t new_size)
732{
733 void *res;
734
735 res = mremap(old_addr, old_size, new_size, MREMAP_MAYMOVE, NULL);
736
737 if (res == MAP_FAILED)
738 return NULL;
739
740 return res;
741}
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 <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, /* device */
23 .ust_ino = src->st_ino, /* inode */
24 .ust_mode = src->st_mode, /* protection */
25 .ust_nlink = src->st_nlink, /* number of hard links */
26 .ust_uid = src->st_uid, /* user ID of owner */
27 .ust_gid = src->st_gid, /* group ID of owner */
28 .ust_size = src->st_size, /* total size, in bytes */
29 .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
30 .ust_blocks = src->st_blocks, /* number of blocks allocated */
31 .ust_atime = src->st_atime, /* time of last access */
32 .ust_mtime = src->st_mtime, /* time of last modification */
33 .ust_ctime = src->st_ctime, /* time of last change */
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/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
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/* FIXME: ensure namebuf in os_get_if_name is big enough */
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}