v4.19.13 snapshot.
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
new file mode 100644
index 0000000..c019709
--- /dev/null
+++ b/arch/um/os-Linux/file.c
@@ -0,0 +1,612 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <sys/un.h>
+#include <sys/types.h>
+#include <os.h>
+
+static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
+{
+ *dst = ((struct uml_stat) {
+ .ust_dev = src->st_dev, /* device */
+ .ust_ino = src->st_ino, /* inode */
+ .ust_mode = src->st_mode, /* protection */
+ .ust_nlink = src->st_nlink, /* number of hard links */
+ .ust_uid = src->st_uid, /* user ID of owner */
+ .ust_gid = src->st_gid, /* group ID of owner */
+ .ust_size = src->st_size, /* total size, in bytes */
+ .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
+ .ust_blocks = src->st_blocks, /* number of blocks allocated */
+ .ust_atime = src->st_atime, /* time of last access */
+ .ust_mtime = src->st_mtime, /* time of last modification */
+ .ust_ctime = src->st_ctime, /* time of last change */
+ });
+}
+
+int os_stat_fd(const int fd, struct uml_stat *ubuf)
+{
+ struct stat64 sbuf;
+ int err;
+
+ CATCH_EINTR(err = fstat64(fd, &sbuf));
+ if (err < 0)
+ return -errno;
+
+ if (ubuf != NULL)
+ copy_stat(ubuf, &sbuf);
+ return err;
+}
+
+int os_stat_file(const char *file_name, struct uml_stat *ubuf)
+{
+ struct stat64 sbuf;
+ int err;
+
+ CATCH_EINTR(err = stat64(file_name, &sbuf));
+ if (err < 0)
+ return -errno;
+
+ if (ubuf != NULL)
+ copy_stat(ubuf, &sbuf);
+ return err;
+}
+
+int os_access(const char *file, int mode)
+{
+ int amode, err;
+
+ amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
+ (mode & OS_ACC_W_OK ? W_OK : 0) |
+ (mode & OS_ACC_X_OK ? X_OK : 0) |
+ (mode & OS_ACC_F_OK ? F_OK : 0);
+
+ err = access(file, amode);
+ if (err < 0)
+ return -errno;
+
+ return 0;
+}
+
+/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
+int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
+{
+ int err;
+
+ err = ioctl(fd, cmd, arg);
+ if (err < 0)
+ return -errno;
+
+ return err;
+}
+
+/* FIXME: ensure namebuf in os_get_if_name is big enough */
+int os_get_ifname(int fd, char* namebuf)
+{
+ if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_set_slip(int fd)
+{
+ int disc, sencap;
+
+ disc = N_SLIP;
+ if (ioctl(fd, TIOCSETD, &disc) < 0)
+ return -errno;
+
+ sencap = 0;
+ if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_mode_fd(int fd, int mode)
+{
+ int err;
+
+ CATCH_EINTR(err = fchmod(fd, mode));
+ if (err < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_file_type(char *file)
+{
+ struct uml_stat buf;
+ int err;
+
+ err = os_stat_file(file, &buf);
+ if (err < 0)
+ return err;
+
+ if (S_ISDIR(buf.ust_mode))
+ return OS_TYPE_DIR;
+ else if (S_ISLNK(buf.ust_mode))
+ return OS_TYPE_SYMLINK;
+ else if (S_ISCHR(buf.ust_mode))
+ return OS_TYPE_CHARDEV;
+ else if (S_ISBLK(buf.ust_mode))
+ return OS_TYPE_BLOCKDEV;
+ else if (S_ISFIFO(buf.ust_mode))
+ return OS_TYPE_FIFO;
+ else if (S_ISSOCK(buf.ust_mode))
+ return OS_TYPE_SOCK;
+ else return OS_TYPE_FILE;
+}
+
+int os_file_mode(const char *file, struct openflags *mode_out)
+{
+ int err;
+
+ *mode_out = OPENFLAGS();
+
+ err = access(file, W_OK);
+ if (err && (errno != EACCES))
+ return -errno;
+ else if (!err)
+ *mode_out = of_write(*mode_out);
+
+ err = access(file, R_OK);
+ if (err && (errno != EACCES))
+ return -errno;
+ else if (!err)
+ *mode_out = of_read(*mode_out);
+
+ return err;
+}
+
+int os_open_file(const char *file, struct openflags flags, int mode)
+{
+ int fd, err, f = 0;
+
+ if (flags.r && flags.w)
+ f = O_RDWR;
+ else if (flags.r)
+ f = O_RDONLY;
+ else if (flags.w)
+ f = O_WRONLY;
+ else f = 0;
+
+ if (flags.s)
+ f |= O_SYNC;
+ if (flags.c)
+ f |= O_CREAT;
+ if (flags.t)
+ f |= O_TRUNC;
+ if (flags.e)
+ f |= O_EXCL;
+ if (flags.a)
+ f |= O_APPEND;
+
+ fd = open64(file, f, mode);
+ if (fd < 0)
+ return -errno;
+
+ if (flags.cl && fcntl(fd, F_SETFD, 1)) {
+ err = -errno;
+ close(fd);
+ return err;
+ }
+
+ return fd;
+}
+
+int os_connect_socket(const char *name)
+{
+ struct sockaddr_un sock;
+ int fd, err;
+
+ sock.sun_family = AF_UNIX;
+ snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
+
+ fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
+ if (err) {
+ err = -errno;
+ goto out_close;
+ }
+
+ return fd;
+
+out_close:
+ close(fd);
+out:
+ return err;
+}
+
+void os_close_file(int fd)
+{
+ close(fd);
+}
+int os_fsync_file(int fd)
+{
+ if (fsync(fd) < 0)
+ return -errno;
+ return 0;
+}
+
+int os_seek_file(int fd, unsigned long long offset)
+{
+ unsigned long long actual;
+
+ actual = lseek64(fd, offset, SEEK_SET);
+ if (actual != offset)
+ return -errno;
+ return 0;
+}
+
+int os_read_file(int fd, void *buf, int len)
+{
+ int n = read(fd, buf, len);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+int os_pread_file(int fd, void *buf, int len, unsigned long long offset)
+{
+ int n = pread(fd, buf, len, offset);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+int os_write_file(int fd, const void *buf, int len)
+{
+ int n = write(fd, (void *) buf, len);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+int os_sync_file(int fd)
+{
+ int n = fsync(fd);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset)
+{
+ int n = pwrite(fd, (void *) buf, len, offset);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+
+int os_file_size(const char *file, unsigned long long *size_out)
+{
+ struct uml_stat buf;
+ int err;
+
+ err = os_stat_file(file, &buf);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
+ -err);
+ return err;
+ }
+
+ if (S_ISBLK(buf.ust_mode)) {
+ int fd;
+ long blocks;
+
+ fd = open(file, O_RDONLY, 0);
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "Couldn't open \"%s\", "
+ "errno = %d\n", file, errno);
+ return err;
+ }
+ if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "Couldn't get the block size of "
+ "\"%s\", errno = %d\n", file, errno);
+ close(fd);
+ return err;
+ }
+ *size_out = ((long long) blocks) * 512;
+ close(fd);
+ }
+ else *size_out = buf.ust_size;
+
+ return 0;
+}
+
+int os_file_modtime(const char *file, unsigned long *modtime)
+{
+ struct uml_stat buf;
+ int err;
+
+ err = os_stat_file(file, &buf);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
+ -err);
+ return err;
+ }
+
+ *modtime = buf.ust_mtime;
+ return 0;
+}
+
+int os_set_exec_close(int fd)
+{
+ int err;
+
+ CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
+
+ if (err < 0)
+ return -errno;
+ return err;
+}
+
+int os_pipe(int *fds, int stream, int close_on_exec)
+{
+ int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
+
+ err = socketpair(AF_UNIX, type, 0, fds);
+ if (err < 0)
+ return -errno;
+
+ if (!close_on_exec)
+ return 0;
+
+ err = os_set_exec_close(fds[0]);
+ if (err < 0)
+ goto error;
+
+ err = os_set_exec_close(fds[1]);
+ if (err < 0)
+ goto error;
+
+ return 0;
+
+ error:
+ printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
+ -err);
+ close(fds[1]);
+ close(fds[0]);
+ return err;
+}
+
+int os_set_fd_async(int fd)
+{
+ int err, flags;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ flags |= O_ASYNC | O_NONBLOCK;
+ if (fcntl(fd, F_SETFL, flags) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
+ "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
+ return err;
+ }
+
+ if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
+ (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
+ err = -errno;
+ printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
+ "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
+ return err;
+ }
+
+ return 0;
+}
+
+int os_clear_fd_async(int fd)
+{
+ int flags;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ flags &= ~(O_ASYNC | O_NONBLOCK);
+ if (fcntl(fd, F_SETFL, flags) < 0)
+ return -errno;
+ return 0;
+}
+
+int os_set_fd_block(int fd, int blocking)
+{
+ int flags;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ if (blocking)
+ flags &= ~O_NONBLOCK;
+ else
+ flags |= O_NONBLOCK;
+
+ if (fcntl(fd, F_SETFL, flags) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_accept_connection(int fd)
+{
+ int new;
+
+ new = accept(fd, NULL, 0);
+ if (new < 0)
+ return -errno;
+ return new;
+}
+
+#ifndef SHUT_RD
+#define SHUT_RD 0
+#endif
+
+#ifndef SHUT_WR
+#define SHUT_WR 1
+#endif
+
+#ifndef SHUT_RDWR
+#define SHUT_RDWR 2
+#endif
+
+int os_shutdown_socket(int fd, int r, int w)
+{
+ int what, err;
+
+ if (r && w)
+ what = SHUT_RDWR;
+ else if (r)
+ what = SHUT_RD;
+ else if (w)
+ what = SHUT_WR;
+ else
+ return -EINVAL;
+
+ err = shutdown(fd, what);
+ if (err < 0)
+ return -errno;
+ return 0;
+}
+
+int os_rcv_fd(int fd, int *helper_pid_out)
+{
+ int new, n;
+ char buf[CMSG_SPACE(sizeof(new))];
+ struct msghdr msg;
+ struct cmsghdr *cmsg;
+ struct iovec iov;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ iov = ((struct iovec) { .iov_base = helper_pid_out,
+ .iov_len = sizeof(*helper_pid_out) });
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = buf;
+ msg.msg_controllen = sizeof(buf);
+ msg.msg_flags = 0;
+
+ n = recvmsg(fd, &msg, 0);
+ if (n < 0)
+ return -errno;
+ else if (n != iov.iov_len)
+ *helper_pid_out = -1;
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (cmsg == NULL) {
+ printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
+ "error = %d\n", errno);
+ return -1;
+ }
+ if ((cmsg->cmsg_level != SOL_SOCKET) ||
+ (cmsg->cmsg_type != SCM_RIGHTS)) {
+ printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
+ return -1;
+ }
+
+ new = ((int *) CMSG_DATA(cmsg))[0];
+ return new;
+}
+
+int os_create_unix_socket(const char *file, int len, int close_on_exec)
+{
+ struct sockaddr_un addr;
+ int sock, err;
+
+ sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if (sock < 0)
+ return -errno;
+
+ if (close_on_exec) {
+ err = os_set_exec_close(sock);
+ if (err < 0)
+ printk(UM_KERN_ERR "create_unix_socket : "
+ "close_on_exec failed, err = %d", -err);
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ snprintf(addr.sun_path, len, "%s", file);
+
+ err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+ if (err < 0)
+ return -errno;
+
+ return sock;
+}
+
+void os_flush_stdout(void)
+{
+ fflush(stdout);
+}
+
+int os_lock_file(int fd, int excl)
+{
+ int type = excl ? F_WRLCK : F_RDLCK;
+ struct flock lock = ((struct flock) { .l_type = type,
+ .l_whence = SEEK_SET,
+ .l_start = 0,
+ .l_len = 0 } );
+ int err, save;
+
+ err = fcntl(fd, F_SETLK, &lock);
+ if (!err)
+ goto out;
+
+ save = -errno;
+ err = fcntl(fd, F_GETLK, &lock);
+ if (err) {
+ err = -errno;
+ goto out;
+ }
+
+ printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
+ lock.l_pid);
+ err = save;
+ out:
+ return err;
+}
+
+unsigned os_major(unsigned long long dev)
+{
+ return major(dev);
+}
+
+unsigned os_minor(unsigned long long dev)
+{
+ return minor(dev);
+}
+
+unsigned long long os_makedev(unsigned major, unsigned minor)
+{
+ return makedev(major, minor);
+}