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698 lines
12 KiB
698 lines
12 KiB
// 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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|
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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/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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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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{ |
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int err; |
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CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); |
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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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{ |
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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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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]); |
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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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{ |
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int err, flags; |
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flags = fcntl(fd, F_GETFL); |
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if (flags < 0) |
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return -errno; |
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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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} |
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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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} |
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return 0; |
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} |
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int os_clear_fd_async(int fd) |
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{ |
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int flags; |
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flags = fcntl(fd, F_GETFL); |
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if (flags < 0) |
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return -errno; |
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flags &= ~(O_ASYNC | O_NONBLOCK); |
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if (fcntl(fd, F_SETFL, flags) < 0) |
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return -errno; |
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return 0; |
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} |
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int os_set_fd_block(int fd, int blocking) |
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{ |
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int flags; |
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flags = fcntl(fd, F_GETFL); |
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if (flags < 0) |
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return -errno; |
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if (blocking) |
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flags &= ~O_NONBLOCK; |
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else |
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flags |= O_NONBLOCK; |
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if (fcntl(fd, F_SETFL, flags) < 0) |
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return -errno; |
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return 0; |
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} |
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int os_accept_connection(int fd) |
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{ |
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int new; |
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new = accept(fd, NULL, 0); |
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if (new < 0) |
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return -errno; |
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return new; |
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} |
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#ifndef SHUT_RD |
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#define SHUT_RD 0 |
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#endif |
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#ifndef SHUT_WR |
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#define SHUT_WR 1 |
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#endif |
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#ifndef SHUT_RDWR |
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#define SHUT_RDWR 2 |
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#endif |
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int os_shutdown_socket(int fd, int r, int w) |
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{ |
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int what, err; |
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if (r && w) |
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what = SHUT_RDWR; |
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else if (r) |
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what = SHUT_RD; |
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else if (w) |
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what = SHUT_WR; |
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else |
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return -EINVAL; |
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err = shutdown(fd, what); |
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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_rcv_fd(int fd, int *helper_pid_out) |
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{ |
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int new, n; |
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char buf[CMSG_SPACE(sizeof(new))]; |
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struct msghdr msg; |
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struct cmsghdr *cmsg; |
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struct iovec iov; |
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msg.msg_name = NULL; |
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msg.msg_namelen = 0; |
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iov = ((struct iovec) { .iov_base = helper_pid_out, |
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.iov_len = sizeof(*helper_pid_out) }); |
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msg.msg_iov = &iov; |
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msg.msg_iovlen = 1; |
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msg.msg_control = buf; |
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msg.msg_controllen = sizeof(buf); |
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msg.msg_flags = 0; |
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n = recvmsg(fd, &msg, 0); |
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if (n < 0) |
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return -errno; |
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else if (n != iov.iov_len) |
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*helper_pid_out = -1; |
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cmsg = CMSG_FIRSTHDR(&msg); |
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if (cmsg == NULL) { |
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printk(UM_KERN_ERR "rcv_fd didn't receive anything, " |
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"error = %d\n", errno); |
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return -1; |
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} |
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if ((cmsg->cmsg_level != SOL_SOCKET) || |
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(cmsg->cmsg_type != SCM_RIGHTS)) { |
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printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n"); |
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return -1; |
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} |
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new = ((int *) CMSG_DATA(cmsg))[0]; |
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return new; |
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} |
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int os_create_unix_socket(const char *file, int len, int close_on_exec) |
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{ |
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struct sockaddr_un addr; |
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int sock, err; |
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sock = socket(PF_UNIX, SOCK_DGRAM, 0); |
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if (sock < 0) |
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return -errno; |
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if (close_on_exec) { |
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err = os_set_exec_close(sock); |
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if (err < 0) |
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printk(UM_KERN_ERR "create_unix_socket : " |
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"close_on_exec failed, err = %d", -err); |
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} |
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addr.sun_family = AF_UNIX; |
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|
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snprintf(addr.sun_path, len, "%s", file); |
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err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); |
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if (err < 0) |
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return -errno; |
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return sock; |
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} |
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void os_flush_stdout(void) |
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{ |
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fflush(stdout); |
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} |
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int os_lock_file(int fd, int excl) |
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{ |
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int type = excl ? F_WRLCK : F_RDLCK; |
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struct flock lock = ((struct flock) { .l_type = type, |
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.l_whence = SEEK_SET, |
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.l_start = 0, |
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.l_len = 0 } ); |
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int err, save; |
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err = fcntl(fd, F_SETLK, &lock); |
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if (!err) |
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goto out; |
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save = -errno; |
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err = fcntl(fd, F_GETLK, &lock); |
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if (err) { |
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err = -errno; |
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goto out; |
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} |
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printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n", |
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lock.l_pid); |
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err = save; |
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out: |
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return err; |
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} |
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|
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unsigned os_major(unsigned long long dev) |
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{ |
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return major(dev); |
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} |
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unsigned os_minor(unsigned long long dev) |
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{ |
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return minor(dev); |
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} |
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unsigned long long os_makedev(unsigned major, unsigned minor) |
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{ |
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return makedev(major, minor); |
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} |
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int os_falloc_punch(int fd, unsigned long long offset, int len) |
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{ |
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int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len); |
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|
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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_eventfd(unsigned int initval, int flags) |
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{ |
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int fd = eventfd(initval, flags); |
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|
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if (fd < 0) |
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return -errno; |
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return fd; |
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} |
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int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds, |
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unsigned int fds_num) |
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{ |
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struct iovec iov = { |
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.iov_base = (void *) buf, |
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.iov_len = len, |
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}; |
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union { |
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char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)]; |
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struct cmsghdr align; |
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} u; |
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unsigned int fds_size = sizeof(*fds) * fds_num; |
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struct msghdr msg = { |
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.msg_iov = &iov, |
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.msg_iovlen = 1, |
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.msg_control = u.control, |
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.msg_controllen = CMSG_SPACE(fds_size), |
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}; |
|
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; |
|
}
|
|
|