1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
13 #include <linux/falloc.h>
14 #include <sys/ioctl.h>
15 #include <sys/mount.h>
16 #include <sys/socket.h>
18 #include <sys/sysmacros.h>
20 #include <sys/types.h>
21 #include <sys/eventfd.h>
25 static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
27 *dst = ((struct uml_stat) {
28 .ust_dev = src->st_dev, /* device */
29 .ust_ino = src->st_ino, /* inode */
30 .ust_mode = src->st_mode, /* protection */
31 .ust_nlink = src->st_nlink, /* number of hard links */
32 .ust_uid = src->st_uid, /* user ID of owner */
33 .ust_gid = src->st_gid, /* group ID of owner */
34 .ust_size = src->st_size, /* total size, in bytes */
35 .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
36 .ust_blocks = src->st_blocks, /* number of blocks allocated */
37 .ust_atime = src->st_atime, /* time of last access */
38 .ust_mtime = src->st_mtime, /* time of last modification */
39 .ust_ctime = src->st_ctime, /* time of last change */
43 int os_stat_fd(const int fd, struct uml_stat *ubuf)
48 CATCH_EINTR(err = fstat64(fd, &sbuf));
53 copy_stat(ubuf, &sbuf);
57 int os_stat_file(const char *file_name, struct uml_stat *ubuf)
62 CATCH_EINTR(err = stat64(file_name, &sbuf));
67 copy_stat(ubuf, &sbuf);
71 int os_access(const char *file, int mode)
75 amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
76 (mode & OS_ACC_W_OK ? W_OK : 0) |
77 (mode & OS_ACC_X_OK ? X_OK : 0) |
78 (mode & OS_ACC_F_OK ? F_OK : 0);
80 err = access(file, amode);
87 /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
88 int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
92 err = ioctl(fd, cmd, arg);
99 /* FIXME: ensure namebuf in os_get_if_name is big enough */
100 int os_get_ifname(int fd, char* namebuf)
102 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
108 int os_set_slip(int fd)
113 if (ioctl(fd, TIOCSETD, &disc) < 0)
117 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
123 int os_mode_fd(int fd, int mode)
127 CATCH_EINTR(err = fchmod(fd, mode));
134 int os_file_type(char *file)
139 err = os_stat_file(file, &buf);
143 if (S_ISDIR(buf.ust_mode))
145 else if (S_ISLNK(buf.ust_mode))
146 return OS_TYPE_SYMLINK;
147 else if (S_ISCHR(buf.ust_mode))
148 return OS_TYPE_CHARDEV;
149 else if (S_ISBLK(buf.ust_mode))
150 return OS_TYPE_BLOCKDEV;
151 else if (S_ISFIFO(buf.ust_mode))
153 else if (S_ISSOCK(buf.ust_mode))
155 else return OS_TYPE_FILE;
158 int os_file_mode(const char *file, struct openflags *mode_out)
162 *mode_out = OPENFLAGS();
164 err = access(file, W_OK);
165 if (err && (errno != EACCES))
168 *mode_out = of_write(*mode_out);
170 err = access(file, R_OK);
171 if (err && (errno != EACCES))
174 *mode_out = of_read(*mode_out);
179 int os_open_file(const char *file, struct openflags flags, int mode)
183 if (flags.r && flags.w)
202 fd = open64(file, f, mode);
206 if (flags.cl && fcntl(fd, F_SETFD, 1)) {
215 int os_connect_socket(const char *name)
217 struct sockaddr_un sock;
220 sock.sun_family = AF_UNIX;
221 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
223 fd = socket(AF_UNIX, SOCK_STREAM, 0);
229 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
243 void os_close_file(int fd)
247 int os_fsync_file(int fd)
254 int os_seek_file(int fd, unsigned long long offset)
256 unsigned long long actual;
258 actual = lseek64(fd, offset, SEEK_SET);
259 if (actual != offset)
264 int os_read_file(int fd, void *buf, int len)
266 int n = read(fd, buf, len);
273 int os_pread_file(int fd, void *buf, int len, unsigned long long offset)
275 int n = pread(fd, buf, len, offset);
282 int os_write_file(int fd, const void *buf, int len)
284 int n = write(fd, (void *) buf, len);
291 int os_sync_file(int fd)
293 int n = fdatasync(fd);
300 int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset)
302 int n = pwrite(fd, (void *) buf, len, offset);
310 int os_file_size(const char *file, unsigned long long *size_out)
315 err = os_stat_file(file, &buf);
317 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
322 if (S_ISBLK(buf.ust_mode)) {
326 fd = open(file, O_RDONLY, 0);
329 printk(UM_KERN_ERR "Couldn't open \"%s\", "
330 "errno = %d\n", file, errno);
333 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
335 printk(UM_KERN_ERR "Couldn't get the block size of "
336 "\"%s\", errno = %d\n", file, errno);
340 *size_out = ((long long) blocks) * 512;
343 else *size_out = buf.ust_size;
348 int os_file_modtime(const char *file, long long *modtime)
353 err = os_stat_file(file, &buf);
355 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
360 *modtime = buf.ust_mtime;
364 int os_set_exec_close(int fd)
368 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
375 int os_pipe(int *fds, int stream, int close_on_exec)
377 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
379 err = socketpair(AF_UNIX, type, 0, fds);
386 err = os_set_exec_close(fds[0]);
390 err = os_set_exec_close(fds[1]);
397 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
404 int os_set_fd_async(int fd)
408 flags = fcntl(fd, F_GETFL);
412 flags |= O_ASYNC | O_NONBLOCK;
413 if (fcntl(fd, F_SETFL, flags) < 0) {
415 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
416 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
420 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
421 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
423 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
424 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
431 int os_clear_fd_async(int fd)
435 flags = fcntl(fd, F_GETFL);
439 flags &= ~(O_ASYNC | O_NONBLOCK);
440 if (fcntl(fd, F_SETFL, flags) < 0)
445 int os_set_fd_block(int fd, int blocking)
449 flags = fcntl(fd, F_GETFL);
454 flags &= ~O_NONBLOCK;
458 if (fcntl(fd, F_SETFL, flags) < 0)
464 int os_accept_connection(int fd)
468 new = accept(fd, NULL, 0);
486 int os_shutdown_socket(int fd, int r, int w)
499 err = shutdown(fd, what);
505 int os_rcv_fd(int fd, int *helper_pid_out)
508 char buf[CMSG_SPACE(sizeof(new))];
510 struct cmsghdr *cmsg;
515 iov = ((struct iovec) { .iov_base = helper_pid_out,
516 .iov_len = sizeof(*helper_pid_out) });
519 msg.msg_control = buf;
520 msg.msg_controllen = sizeof(buf);
523 n = recvmsg(fd, &msg, 0);
526 else if (n != iov.iov_len)
527 *helper_pid_out = -1;
529 cmsg = CMSG_FIRSTHDR(&msg);
531 printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
532 "error = %d\n", errno);
535 if ((cmsg->cmsg_level != SOL_SOCKET) ||
536 (cmsg->cmsg_type != SCM_RIGHTS)) {
537 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
541 new = ((int *) CMSG_DATA(cmsg))[0];
545 int os_create_unix_socket(const char *file, int len, int close_on_exec)
547 struct sockaddr_un addr;
550 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
555 err = os_set_exec_close(sock);
557 printk(UM_KERN_ERR "create_unix_socket : "
558 "close_on_exec failed, err = %d", -err);
561 addr.sun_family = AF_UNIX;
563 snprintf(addr.sun_path, len, "%s", file);
565 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
572 void os_flush_stdout(void)
577 int os_lock_file(int fd, int excl)
579 int type = excl ? F_WRLCK : F_RDLCK;
580 struct flock lock = ((struct flock) { .l_type = type,
581 .l_whence = SEEK_SET,
586 err = fcntl(fd, F_SETLK, &lock);
591 err = fcntl(fd, F_GETLK, &lock);
597 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
604 unsigned os_major(unsigned long long dev)
609 unsigned os_minor(unsigned long long dev)
614 unsigned long long os_makedev(unsigned major, unsigned minor)
616 return makedev(major, minor);
619 int os_falloc_punch(int fd, unsigned long long offset, int len)
621 int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
628 int os_falloc_zeroes(int fd, unsigned long long offset, int len)
630 int n = fallocate(fd, FALLOC_FL_ZERO_RANGE|FALLOC_FL_KEEP_SIZE, offset, len);
637 int os_eventfd(unsigned int initval, int flags)
639 int fd = eventfd(initval, flags);
646 int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds,
647 unsigned int fds_num)
650 .iov_base = (void *) buf,
654 char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)];
655 struct cmsghdr align;
657 unsigned int fds_size = sizeof(*fds) * fds_num;
658 struct msghdr msg = {
661 .msg_control = u.control,
662 .msg_controllen = CMSG_SPACE(fds_size),
664 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
667 if (fds_num > OS_SENDMSG_MAX_FDS)
669 memset(u.control, 0, sizeof(u.control));
670 cmsg->cmsg_level = SOL_SOCKET;
671 cmsg->cmsg_type = SCM_RIGHTS;
672 cmsg->cmsg_len = CMSG_LEN(fds_size);
673 memcpy(CMSG_DATA(cmsg), fds, fds_size);
674 err = sendmsg(fd, &msg, 0);
681 int os_poll(unsigned int n, const int *fds)
683 /* currently need 2 FDs at most so avoid dynamic allocation */
684 struct pollfd pollfds[2] = {};
688 if (n > ARRAY_SIZE(pollfds))
691 for (i = 0; i < n; i++) {
692 pollfds[i].fd = fds[i];
693 pollfds[i].events = POLLIN;
696 ret = poll(pollfds, n, -1);
700 /* Return the index of the available FD */
701 for (i = 0; i < n; i++) {
702 if (pollfds[i].revents)