1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
11 #include <sys/ioctl.h>
12 #include <sys/mount.h>
13 #include <sys/socket.h>
15 #include <sys/sysmacros.h>
17 #include <sys/types.h>
18 #include <sys/eventfd.h>
21 static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
23 *dst = ((struct uml_stat) {
24 .ust_dev = src->st_dev, /* device */
25 .ust_ino = src->st_ino, /* inode */
26 .ust_mode = src->st_mode, /* protection */
27 .ust_nlink = src->st_nlink, /* number of hard links */
28 .ust_uid = src->st_uid, /* user ID of owner */
29 .ust_gid = src->st_gid, /* group ID of owner */
30 .ust_size = src->st_size, /* total size, in bytes */
31 .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
32 .ust_blocks = src->st_blocks, /* number of blocks allocated */
33 .ust_atime = src->st_atime, /* time of last access */
34 .ust_mtime = src->st_mtime, /* time of last modification */
35 .ust_ctime = src->st_ctime, /* time of last change */
39 int os_stat_fd(const int fd, struct uml_stat *ubuf)
44 CATCH_EINTR(err = fstat64(fd, &sbuf));
49 copy_stat(ubuf, &sbuf);
53 int os_stat_file(const char *file_name, struct uml_stat *ubuf)
58 CATCH_EINTR(err = stat64(file_name, &sbuf));
63 copy_stat(ubuf, &sbuf);
67 int os_access(const char *file, int mode)
71 amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
72 (mode & OS_ACC_W_OK ? W_OK : 0) |
73 (mode & OS_ACC_X_OK ? X_OK : 0) |
74 (mode & OS_ACC_F_OK ? F_OK : 0);
76 err = access(file, amode);
83 /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
84 int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
88 err = ioctl(fd, cmd, arg);
95 /* FIXME: ensure namebuf in os_get_if_name is big enough */
96 int os_get_ifname(int fd, char* namebuf)
98 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
104 int os_set_slip(int fd)
109 if (ioctl(fd, TIOCSETD, &disc) < 0)
113 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
119 int os_mode_fd(int fd, int mode)
123 CATCH_EINTR(err = fchmod(fd, mode));
130 int os_file_type(char *file)
135 err = os_stat_file(file, &buf);
139 if (S_ISDIR(buf.ust_mode))
141 else if (S_ISLNK(buf.ust_mode))
142 return OS_TYPE_SYMLINK;
143 else if (S_ISCHR(buf.ust_mode))
144 return OS_TYPE_CHARDEV;
145 else if (S_ISBLK(buf.ust_mode))
146 return OS_TYPE_BLOCKDEV;
147 else if (S_ISFIFO(buf.ust_mode))
149 else if (S_ISSOCK(buf.ust_mode))
151 else return OS_TYPE_FILE;
154 int os_file_mode(const char *file, struct openflags *mode_out)
158 *mode_out = OPENFLAGS();
160 err = access(file, W_OK);
161 if (err && (errno != EACCES))
164 *mode_out = of_write(*mode_out);
166 err = access(file, R_OK);
167 if (err && (errno != EACCES))
170 *mode_out = of_read(*mode_out);
175 int os_open_file(const char *file, struct openflags flags, int mode)
179 if (flags.r && flags.w)
198 fd = open64(file, f, mode);
202 if (flags.cl && fcntl(fd, F_SETFD, 1)) {
211 int os_connect_socket(const char *name)
213 struct sockaddr_un sock;
216 sock.sun_family = AF_UNIX;
217 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
219 fd = socket(AF_UNIX, SOCK_STREAM, 0);
225 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
239 void os_close_file(int fd)
243 int os_fsync_file(int fd)
250 int os_seek_file(int fd, unsigned long long offset)
252 unsigned long long actual;
254 actual = lseek64(fd, offset, SEEK_SET);
255 if (actual != offset)
260 int os_read_file(int fd, void *buf, int len)
262 int n = read(fd, buf, len);
269 int os_pread_file(int fd, void *buf, int len, unsigned long long offset)
271 int n = pread(fd, buf, len, offset);
278 int os_write_file(int fd, const void *buf, int len)
280 int n = write(fd, (void *) buf, len);
287 int os_sync_file(int fd)
296 int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset)
298 int n = pwrite(fd, (void *) buf, len, offset);
306 int os_file_size(const char *file, unsigned long long *size_out)
311 err = os_stat_file(file, &buf);
313 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
318 if (S_ISBLK(buf.ust_mode)) {
322 fd = open(file, O_RDONLY, 0);
325 printk(UM_KERN_ERR "Couldn't open \"%s\", "
326 "errno = %d\n", file, errno);
329 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
331 printk(UM_KERN_ERR "Couldn't get the block size of "
332 "\"%s\", errno = %d\n", file, errno);
336 *size_out = ((long long) blocks) * 512;
339 else *size_out = buf.ust_size;
344 int os_file_modtime(const char *file, long long *modtime)
349 err = os_stat_file(file, &buf);
351 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
356 *modtime = buf.ust_mtime;
360 int os_set_exec_close(int fd)
364 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
371 int os_pipe(int *fds, int stream, int close_on_exec)
373 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
375 err = socketpair(AF_UNIX, type, 0, fds);
382 err = os_set_exec_close(fds[0]);
386 err = os_set_exec_close(fds[1]);
393 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
400 int os_set_fd_async(int fd)
404 flags = fcntl(fd, F_GETFL);
408 flags |= O_ASYNC | O_NONBLOCK;
409 if (fcntl(fd, F_SETFL, flags) < 0) {
411 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
412 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
416 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
417 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
419 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
420 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
427 int os_clear_fd_async(int fd)
431 flags = fcntl(fd, F_GETFL);
435 flags &= ~(O_ASYNC | O_NONBLOCK);
436 if (fcntl(fd, F_SETFL, flags) < 0)
441 int os_set_fd_block(int fd, int blocking)
445 flags = fcntl(fd, F_GETFL);
450 flags &= ~O_NONBLOCK;
454 if (fcntl(fd, F_SETFL, flags) < 0)
460 int os_accept_connection(int fd)
464 new = accept(fd, NULL, 0);
482 int os_shutdown_socket(int fd, int r, int w)
495 err = shutdown(fd, what);
501 int os_rcv_fd(int fd, int *helper_pid_out)
504 char buf[CMSG_SPACE(sizeof(new))];
506 struct cmsghdr *cmsg;
511 iov = ((struct iovec) { .iov_base = helper_pid_out,
512 .iov_len = sizeof(*helper_pid_out) });
515 msg.msg_control = buf;
516 msg.msg_controllen = sizeof(buf);
519 n = recvmsg(fd, &msg, 0);
522 else if (n != iov.iov_len)
523 *helper_pid_out = -1;
525 cmsg = CMSG_FIRSTHDR(&msg);
527 printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
528 "error = %d\n", errno);
531 if ((cmsg->cmsg_level != SOL_SOCKET) ||
532 (cmsg->cmsg_type != SCM_RIGHTS)) {
533 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
537 new = ((int *) CMSG_DATA(cmsg))[0];
541 int os_create_unix_socket(const char *file, int len, int close_on_exec)
543 struct sockaddr_un addr;
546 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
551 err = os_set_exec_close(sock);
553 printk(UM_KERN_ERR "create_unix_socket : "
554 "close_on_exec failed, err = %d", -err);
557 addr.sun_family = AF_UNIX;
559 snprintf(addr.sun_path, len, "%s", file);
561 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
568 void os_flush_stdout(void)
573 int os_lock_file(int fd, int excl)
575 int type = excl ? F_WRLCK : F_RDLCK;
576 struct flock lock = ((struct flock) { .l_type = type,
577 .l_whence = SEEK_SET,
582 err = fcntl(fd, F_SETLK, &lock);
587 err = fcntl(fd, F_GETLK, &lock);
593 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
600 unsigned os_major(unsigned long long dev)
605 unsigned os_minor(unsigned long long dev)
610 unsigned long long os_makedev(unsigned major, unsigned minor)
612 return makedev(major, minor);
615 int os_falloc_punch(int fd, unsigned long long offset, int len)
617 int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
624 int os_eventfd(unsigned int initval, int flags)
626 int fd = eventfd(initval, flags);
633 int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds,
634 unsigned int fds_num)
637 .iov_base = (void *) buf,
641 char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)];
642 struct cmsghdr align;
644 unsigned int fds_size = sizeof(*fds) * fds_num;
645 struct msghdr msg = {
648 .msg_control = u.control,
649 .msg_controllen = CMSG_SPACE(fds_size),
651 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
654 if (fds_num > OS_SENDMSG_MAX_FDS)
656 memset(u.control, 0, sizeof(u.control));
657 cmsg->cmsg_level = SOL_SOCKET;
658 cmsg->cmsg_type = SCM_RIGHTS;
659 cmsg->cmsg_len = CMSG_LEN(fds_size);
660 memcpy(CMSG_DATA(cmsg), fds, fds_size);
661 err = sendmsg(fd, &msg, 0);