ec24b988eb
When generalizing this, I was in the mindset of this being "userspace" code, but even there we should not use variable arrays as the kernel is moving away from allowing that. Simply reserve (but not use) enough space for the maximum two descriptors we might need now, and return an error if attempting to receive more than that. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202407041459.3SYg4TEi-lkp@intel.com/ Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
748 lines
13 KiB
C
748 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <linux/falloc.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <sys/un.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/eventfd.h>
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#include <poll.h>
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#include <os.h>
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static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
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{
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*dst = ((struct uml_stat) {
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.ust_dev = src->st_dev, /* device */
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.ust_ino = src->st_ino, /* inode */
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.ust_mode = src->st_mode, /* protection */
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.ust_nlink = src->st_nlink, /* number of hard links */
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.ust_uid = src->st_uid, /* user ID of owner */
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.ust_gid = src->st_gid, /* group ID of owner */
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.ust_size = src->st_size, /* total size, in bytes */
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.ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
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.ust_blocks = src->st_blocks, /* number of blocks allocated */
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.ust_atime = src->st_atime, /* time of last access */
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.ust_mtime = src->st_mtime, /* time of last modification */
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.ust_ctime = src->st_ctime, /* time of last change */
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});
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}
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int os_stat_fd(const int fd, struct uml_stat *ubuf)
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{
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struct stat64 sbuf;
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int err;
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CATCH_EINTR(err = fstat64(fd, &sbuf));
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if (err < 0)
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return -errno;
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if (ubuf != NULL)
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copy_stat(ubuf, &sbuf);
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return err;
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}
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int os_stat_file(const char *file_name, struct uml_stat *ubuf)
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{
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struct stat64 sbuf;
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int err;
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CATCH_EINTR(err = stat64(file_name, &sbuf));
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if (err < 0)
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return -errno;
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if (ubuf != NULL)
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copy_stat(ubuf, &sbuf);
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return err;
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}
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int os_access(const char *file, int mode)
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{
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int amode, err;
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amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
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(mode & OS_ACC_W_OK ? W_OK : 0) |
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(mode & OS_ACC_X_OK ? X_OK : 0) |
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(mode & OS_ACC_F_OK ? F_OK : 0);
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err = access(file, amode);
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if (err < 0)
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return -errno;
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return 0;
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}
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/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
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int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
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{
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int err;
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err = ioctl(fd, cmd, arg);
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if (err < 0)
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return -errno;
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return err;
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}
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/* FIXME: ensure namebuf in os_get_if_name is big enough */
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int os_get_ifname(int fd, char* namebuf)
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{
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if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
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return -errno;
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return 0;
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}
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int os_set_slip(int fd)
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{
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int disc, sencap;
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disc = N_SLIP;
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if (ioctl(fd, TIOCSETD, &disc) < 0)
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return -errno;
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sencap = 0;
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if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
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return -errno;
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return 0;
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}
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int os_mode_fd(int fd, int mode)
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{
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int err;
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CATCH_EINTR(err = fchmod(fd, mode));
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if (err < 0)
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return -errno;
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return 0;
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}
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int os_file_type(char *file)
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{
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struct uml_stat buf;
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int err;
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err = os_stat_file(file, &buf);
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if (err < 0)
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return err;
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if (S_ISDIR(buf.ust_mode))
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return OS_TYPE_DIR;
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else if (S_ISLNK(buf.ust_mode))
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return OS_TYPE_SYMLINK;
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else if (S_ISCHR(buf.ust_mode))
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return OS_TYPE_CHARDEV;
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else if (S_ISBLK(buf.ust_mode))
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return OS_TYPE_BLOCKDEV;
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else if (S_ISFIFO(buf.ust_mode))
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return OS_TYPE_FIFO;
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else if (S_ISSOCK(buf.ust_mode))
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return OS_TYPE_SOCK;
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else return OS_TYPE_FILE;
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}
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int os_file_mode(const char *file, struct openflags *mode_out)
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|
{
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int err;
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*mode_out = OPENFLAGS();
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err = access(file, W_OK);
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if (err && (errno != EACCES))
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return -errno;
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else if (!err)
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*mode_out = of_write(*mode_out);
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err = access(file, R_OK);
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if (err && (errno != EACCES))
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return -errno;
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else if (!err)
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*mode_out = of_read(*mode_out);
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return err;
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}
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int os_open_file(const char *file, struct openflags flags, int mode)
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{
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int fd, err, f = 0;
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if (flags.r && flags.w)
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f = O_RDWR;
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else if (flags.r)
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f = O_RDONLY;
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else if (flags.w)
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f = O_WRONLY;
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else f = 0;
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if (flags.s)
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f |= O_SYNC;
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if (flags.c)
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f |= O_CREAT;
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if (flags.t)
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f |= O_TRUNC;
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if (flags.e)
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f |= O_EXCL;
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if (flags.a)
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f |= O_APPEND;
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fd = open64(file, f, mode);
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if (fd < 0)
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return -errno;
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if (flags.cl && fcntl(fd, F_SETFD, 1)) {
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err = -errno;
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close(fd);
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return err;
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}
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return fd;
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}
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int os_connect_socket(const char *name)
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{
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struct sockaddr_un sock;
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int fd, err;
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sock.sun_family = AF_UNIX;
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snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
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fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd < 0) {
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err = -errno;
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goto out;
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}
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err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
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if (err) {
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err = -errno;
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goto out_close;
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}
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return fd;
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out_close:
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close(fd);
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out:
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|
return err;
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|
}
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|
int os_dup_file(int fd)
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|
{
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|
int new_fd = dup(fd);
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|
if (new_fd < 0)
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|
return -errno;
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return new_fd;
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}
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void os_close_file(int fd)
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{
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close(fd);
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}
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int os_fsync_file(int fd)
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{
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if (fsync(fd) < 0)
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return -errno;
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return 0;
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}
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int os_seek_file(int fd, unsigned long long offset)
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|
{
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|
unsigned long long actual;
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actual = lseek64(fd, offset, SEEK_SET);
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if (actual != offset)
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return -errno;
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return 0;
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}
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int os_read_file(int fd, void *buf, int len)
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|
{
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|
int n = read(fd, buf, len);
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if (n < 0)
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return -errno;
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return n;
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}
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int os_pread_file(int fd, void *buf, int len, unsigned long long offset)
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|
{
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int n = pread(fd, buf, len, offset);
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if (n < 0)
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return -errno;
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return n;
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}
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int os_write_file(int fd, const void *buf, int len)
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|
{
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int n = write(fd, (void *) buf, len);
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if (n < 0)
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return -errno;
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return n;
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}
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int os_sync_file(int fd)
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{
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|
int n = fdatasync(fd);
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if (n < 0)
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return -errno;
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return n;
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}
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int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset)
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|
{
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int n = pwrite(fd, (void *) buf, len, offset);
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if (n < 0)
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return -errno;
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return n;
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}
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int os_file_size(const char *file, unsigned long long *size_out)
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{
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struct uml_stat buf;
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int err;
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err = os_stat_file(file, &buf);
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if (err < 0) {
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printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
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-err);
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return err;
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}
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if (S_ISBLK(buf.ust_mode)) {
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int fd;
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long blocks;
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fd = open(file, O_RDONLY, 0);
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if (fd < 0) {
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err = -errno;
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printk(UM_KERN_ERR "Couldn't open \"%s\", "
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"errno = %d\n", file, errno);
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return err;
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}
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if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
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err = -errno;
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printk(UM_KERN_ERR "Couldn't get the block size of "
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"\"%s\", errno = %d\n", file, errno);
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close(fd);
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return err;
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}
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*size_out = ((long long) blocks) * 512;
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close(fd);
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}
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else *size_out = buf.ust_size;
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return 0;
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}
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|
|
int os_file_modtime(const char *file, long long *modtime)
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{
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|
struct uml_stat buf;
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int err;
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err = os_stat_file(file, &buf);
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|
if (err < 0) {
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printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
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-err);
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return err;
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}
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*modtime = buf.ust_mtime;
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return 0;
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}
|
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|
|
int os_set_exec_close(int fd)
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{
|
|
int err;
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CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
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|
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if (err < 0)
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return -errno;
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return err;
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}
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|
|
int os_pipe(int *fds, int stream, int close_on_exec)
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|
{
|
|
int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
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err = socketpair(AF_UNIX, type, 0, fds);
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if (err < 0)
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return -errno;
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|
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if (!close_on_exec)
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return 0;
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err = os_set_exec_close(fds[0]);
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if (err < 0)
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goto error;
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err = os_set_exec_close(fds[1]);
|
|
if (err < 0)
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|
goto error;
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|
return 0;
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|
|
error:
|
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printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
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|
-err);
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close(fds[1]);
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close(fds[0]);
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return err;
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|
}
|
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|
|
int os_set_fd_async(int fd)
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|
{
|
|
int err, flags;
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|
flags = fcntl(fd, F_GETFL);
|
|
if (flags < 0)
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|
return -errno;
|
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|
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flags |= O_ASYNC | O_NONBLOCK;
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|
if (fcntl(fd, F_SETFL, flags) < 0) {
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|
err = -errno;
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printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
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|
"and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
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return err;
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}
|
|
|
|
if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
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(fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
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err = -errno;
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printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
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"(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
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return err;
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|
}
|
|
|
|
return 0;
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|
}
|
|
|
|
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)
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|
{
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* os_rcv_fd_msg - receive message with (optional) FDs
|
|
* @fd: the FD to receive from
|
|
* @fds: the array for FDs to write to
|
|
* @n_fds: number of FDs to receive (@fds array size)
|
|
* @data: the message buffer
|
|
* @data_len: the size of the message to receive
|
|
*
|
|
* Receive a message with FDs.
|
|
*
|
|
* Returns: the size of the received message, or an error code
|
|
*/
|
|
ssize_t os_rcv_fd_msg(int fd, int *fds, unsigned int n_fds,
|
|
void *data, size_t data_len)
|
|
{
|
|
#define MAX_RCV_FDS 2
|
|
char buf[CMSG_SPACE(sizeof(*fds) * MAX_RCV_FDS)];
|
|
struct cmsghdr *cmsg;
|
|
struct iovec iov = {
|
|
.iov_base = data,
|
|
.iov_len = data_len,
|
|
};
|
|
struct msghdr msg = {
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_control = buf,
|
|
.msg_controllen = CMSG_SPACE(sizeof(*fds) * n_fds),
|
|
};
|
|
int n;
|
|
|
|
if (n_fds > MAX_RCV_FDS)
|
|
return -EINVAL;
|
|
|
|
n = recvmsg(fd, &msg, 0);
|
|
if (n < 0)
|
|
return -errno;
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
if (!cmsg ||
|
|
cmsg->cmsg_level != SOL_SOCKET ||
|
|
cmsg->cmsg_type != SCM_RIGHTS)
|
|
return n;
|
|
|
|
memcpy(fds, CMSG_DATA(cmsg), cmsg->cmsg_len);
|
|
return n;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int os_falloc_punch(int fd, unsigned long long offset, int len)
|
|
{
|
|
int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
|
|
|
|
if (n < 0)
|
|
return -errno;
|
|
return n;
|
|
}
|
|
|
|
int os_falloc_zeroes(int fd, unsigned long long offset, int len)
|
|
{
|
|
int n = fallocate(fd, FALLOC_FL_ZERO_RANGE|FALLOC_FL_KEEP_SIZE, offset, len);
|
|
|
|
if (n < 0)
|
|
return -errno;
|
|
return n;
|
|
}
|
|
|
|
int os_eventfd(unsigned int initval, int flags)
|
|
{
|
|
int fd = eventfd(initval, flags);
|
|
|
|
if (fd < 0)
|
|
return -errno;
|
|
return fd;
|
|
}
|
|
|
|
int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds,
|
|
unsigned int fds_num)
|
|
{
|
|
struct iovec iov = {
|
|
.iov_base = (void *) buf,
|
|
.iov_len = len,
|
|
};
|
|
union {
|
|
char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)];
|
|
struct cmsghdr align;
|
|
} u;
|
|
unsigned int fds_size = sizeof(*fds) * fds_num;
|
|
struct msghdr msg = {
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_control = u.control,
|
|
.msg_controllen = CMSG_SPACE(fds_size),
|
|
};
|
|
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
|
|
int err;
|
|
|
|
if (fds_num > OS_SENDMSG_MAX_FDS)
|
|
return -EINVAL;
|
|
memset(u.control, 0, sizeof(u.control));
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(fds_size);
|
|
memcpy(CMSG_DATA(cmsg), fds, fds_size);
|
|
err = sendmsg(fd, &msg, 0);
|
|
|
|
if (err < 0)
|
|
return -errno;
|
|
return err;
|
|
}
|
|
|
|
int os_poll(unsigned int n, const int *fds)
|
|
{
|
|
/* currently need 2 FDs at most so avoid dynamic allocation */
|
|
struct pollfd pollfds[2] = {};
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
if (n > ARRAY_SIZE(pollfds))
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
pollfds[i].fd = fds[i];
|
|
pollfds[i].events = POLLIN;
|
|
}
|
|
|
|
ret = poll(pollfds, n, -1);
|
|
if (ret < 0)
|
|
return -errno;
|
|
|
|
/* Return the index of the available FD */
|
|
for (i = 0; i < n; i++) {
|
|
if (pollfds[i].revents)
|
|
return i;
|
|
}
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
void *os_mmap_rw_shared(int fd, size_t size)
|
|
{
|
|
void *res = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
|
|
|
|
if (res == MAP_FAILED)
|
|
return NULL;
|
|
|
|
return res;
|
|
}
|
|
|
|
void *os_mremap_rw_shared(void *old_addr, size_t old_size, size_t new_size)
|
|
{
|
|
void *res;
|
|
|
|
res = mremap(old_addr, old_size, new_size, MREMAP_MAYMOVE, NULL);
|
|
|
|
if (res == MAP_FAILED)
|
|
return NULL;
|
|
|
|
return res;
|
|
}
|