1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
11 #include <linux/falloc.h>
12 #include <sys/ioctl.h>
13 #include <sys/mount.h>
14 #include <sys/socket.h>
16 #include <sys/sysmacros.h>
18 #include <sys/types.h>
19 #include <sys/eventfd.h>
22 static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
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 */
40 int os_stat_fd(const int fd, struct uml_stat *ubuf)
45 CATCH_EINTR(err = fstat64(fd, &sbuf));
50 copy_stat(ubuf, &sbuf);
54 int os_stat_file(const char *file_name, struct uml_stat *ubuf)
59 CATCH_EINTR(err = stat64(file_name, &sbuf));
64 copy_stat(ubuf, &sbuf);
68 int os_access(const char *file, int mode)
72 amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
73 (mode & OS_ACC_W_OK ? W_OK : 0) |
74 (mode & OS_ACC_X_OK ? X_OK : 0) |
75 (mode & OS_ACC_F_OK ? F_OK : 0);
77 err = access(file, amode);
84 /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
85 int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
89 err = ioctl(fd, cmd, arg);
96 /* FIXME: ensure namebuf in os_get_if_name is big enough */
97 int os_get_ifname(int fd, char* namebuf)
99 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
105 int os_set_slip(int fd)
110 if (ioctl(fd, TIOCSETD, &disc) < 0)
114 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
120 int os_mode_fd(int fd, int mode)
124 CATCH_EINTR(err = fchmod(fd, mode));
131 int os_file_type(char *file)
136 err = os_stat_file(file, &buf);
140 if (S_ISDIR(buf.ust_mode))
142 else if (S_ISLNK(buf.ust_mode))
143 return OS_TYPE_SYMLINK;
144 else if (S_ISCHR(buf.ust_mode))
145 return OS_TYPE_CHARDEV;
146 else if (S_ISBLK(buf.ust_mode))
147 return OS_TYPE_BLOCKDEV;
148 else if (S_ISFIFO(buf.ust_mode))
150 else if (S_ISSOCK(buf.ust_mode))
152 else return OS_TYPE_FILE;
155 int os_file_mode(const char *file, struct openflags *mode_out)
159 *mode_out = OPENFLAGS();
161 err = access(file, W_OK);
162 if (err && (errno != EACCES))
165 *mode_out = of_write(*mode_out);
167 err = access(file, R_OK);
168 if (err && (errno != EACCES))
171 *mode_out = of_read(*mode_out);
176 int os_open_file(const char *file, struct openflags flags, int mode)
180 if (flags.r && flags.w)
199 fd = open64(file, f, mode);
203 if (flags.cl && fcntl(fd, F_SETFD, 1)) {
212 int os_connect_socket(const char *name)
214 struct sockaddr_un sock;
217 sock.sun_family = AF_UNIX;
218 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
220 fd = socket(AF_UNIX, SOCK_STREAM, 0);
226 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
240 void os_close_file(int fd)
244 int os_fsync_file(int fd)
251 int os_seek_file(int fd, unsigned long long offset)
253 unsigned long long actual;
255 actual = lseek64(fd, offset, SEEK_SET);
256 if (actual != offset)
261 int os_read_file(int fd, void *buf, int len)
263 int n = read(fd, buf, len);
270 int os_pread_file(int fd, void *buf, int len, unsigned long long offset)
272 int n = pread(fd, buf, len, offset);
279 int os_write_file(int fd, const void *buf, int len)
281 int n = write(fd, (void *) buf, len);
288 int os_sync_file(int fd)
297 int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset)
299 int n = pwrite(fd, (void *) buf, len, offset);
307 int os_file_size(const char *file, unsigned long long *size_out)
312 err = os_stat_file(file, &buf);
314 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
319 if (S_ISBLK(buf.ust_mode)) {
323 fd = open(file, O_RDONLY, 0);
326 printk(UM_KERN_ERR "Couldn't open \"%s\", "
327 "errno = %d\n", file, errno);
330 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
332 printk(UM_KERN_ERR "Couldn't get the block size of "
333 "\"%s\", errno = %d\n", file, errno);
337 *size_out = ((long long) blocks) * 512;
340 else *size_out = buf.ust_size;
345 int os_file_modtime(const char *file, unsigned long *modtime)
350 err = os_stat_file(file, &buf);
352 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
357 *modtime = buf.ust_mtime;
361 int os_set_exec_close(int fd)
365 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
372 int os_pipe(int *fds, int stream, int close_on_exec)
374 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
376 err = socketpair(AF_UNIX, type, 0, fds);
383 err = os_set_exec_close(fds[0]);
387 err = os_set_exec_close(fds[1]);
394 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
401 int os_set_fd_async(int fd)
405 flags = fcntl(fd, F_GETFL);
409 flags |= O_ASYNC | O_NONBLOCK;
410 if (fcntl(fd, F_SETFL, flags) < 0) {
412 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
413 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
417 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
418 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
420 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
421 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
428 int os_clear_fd_async(int fd)
432 flags = fcntl(fd, F_GETFL);
436 flags &= ~(O_ASYNC | O_NONBLOCK);
437 if (fcntl(fd, F_SETFL, flags) < 0)
442 int os_set_fd_block(int fd, int blocking)
446 flags = fcntl(fd, F_GETFL);
451 flags &= ~O_NONBLOCK;
455 if (fcntl(fd, F_SETFL, flags) < 0)
461 int os_accept_connection(int fd)
465 new = accept(fd, NULL, 0);
483 int os_shutdown_socket(int fd, int r, int w)
496 err = shutdown(fd, what);
502 int os_rcv_fd(int fd, int *helper_pid_out)
505 char buf[CMSG_SPACE(sizeof(new))];
507 struct cmsghdr *cmsg;
512 iov = ((struct iovec) { .iov_base = helper_pid_out,
513 .iov_len = sizeof(*helper_pid_out) });
516 msg.msg_control = buf;
517 msg.msg_controllen = sizeof(buf);
520 n = recvmsg(fd, &msg, 0);
523 else if (n != iov.iov_len)
524 *helper_pid_out = -1;
526 cmsg = CMSG_FIRSTHDR(&msg);
528 printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
529 "error = %d\n", errno);
532 if ((cmsg->cmsg_level != SOL_SOCKET) ||
533 (cmsg->cmsg_type != SCM_RIGHTS)) {
534 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
538 new = ((int *) CMSG_DATA(cmsg))[0];
542 int os_create_unix_socket(const char *file, int len, int close_on_exec)
544 struct sockaddr_un addr;
547 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
552 err = os_set_exec_close(sock);
554 printk(UM_KERN_ERR "create_unix_socket : "
555 "close_on_exec failed, err = %d", -err);
558 addr.sun_family = AF_UNIX;
560 snprintf(addr.sun_path, len, "%s", file);
562 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
569 void os_flush_stdout(void)
574 int os_lock_file(int fd, int excl)
576 int type = excl ? F_WRLCK : F_RDLCK;
577 struct flock lock = ((struct flock) { .l_type = type,
578 .l_whence = SEEK_SET,
583 err = fcntl(fd, F_SETLK, &lock);
588 err = fcntl(fd, F_GETLK, &lock);
594 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
601 unsigned os_major(unsigned long long dev)
606 unsigned os_minor(unsigned long long dev)
611 unsigned long long os_makedev(unsigned major, unsigned minor)
613 return makedev(major, minor);
616 int os_falloc_punch(int fd, unsigned long long offset, int len)
618 int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
625 int os_eventfd(unsigned int initval, int flags)
627 int fd = eventfd(initval, flags);
634 int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds,
635 unsigned int fds_num)
638 .iov_base = (void *) buf,
642 char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)];
643 struct cmsghdr align;
645 unsigned int fds_size = sizeof(*fds) * fds_num;
646 struct msghdr msg = {
649 .msg_control = u.control,
650 .msg_controllen = CMSG_SPACE(fds_size),
652 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
655 if (fds_num > OS_SENDMSG_MAX_FDS)
657 memset(u.control, 0, sizeof(u.control));
658 cmsg->cmsg_level = SOL_SOCKET;
659 cmsg->cmsg_type = SCM_RIGHTS;
660 cmsg->cmsg_len = CMSG_LEN(fds_size);
661 memcpy(CMSG_DATA(cmsg), fds, fds_size);
662 err = sendmsg(fd, &msg, 0);