2022-01-31 21:32:41 +01:00
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/*
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* file related system call shims and definitions
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*
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* Copyright (c) 2013 Stacey D. Son
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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2022-05-06 15:49:09 +02:00
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#ifndef BSD_FILE_H
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#define BSD_FILE_H
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2022-01-31 21:32:41 +01:00
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#include "qemu/path.h"
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2022-06-12 05:32:19 +02:00
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#define LOCK_PATH(p, arg) \
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do { \
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(p) = lock_user_string(arg); \
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if ((p) == NULL) { \
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return -TARGET_EFAULT; \
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} \
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} while (0)
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#define UNLOCK_PATH(p, arg) unlock_user(p, arg, 0)
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2022-01-31 21:32:41 +01:00
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extern struct iovec *lock_iovec(int type, abi_ulong target_addr, int count,
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int copy);
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extern void unlock_iovec(struct iovec *vec, abi_ulong target_addr, int count,
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int copy);
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2022-06-12 05:32:19 +02:00
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int safe_open(const char *path, int flags, mode_t mode);
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int safe_openat(int fd, const char *path, int flags, mode_t mode);
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2022-02-01 00:10:10 +01:00
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ssize_t safe_read(int fd, void *buf, size_t nbytes);
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ssize_t safe_pread(int fd, void *buf, size_t nbytes, off_t offset);
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ssize_t safe_readv(int fd, const struct iovec *iov, int iovcnt);
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ssize_t safe_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
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2022-02-01 00:34:03 +01:00
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ssize_t safe_write(int fd, void *buf, size_t nbytes);
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ssize_t safe_pwrite(int fd, void *buf, size_t nbytes, off_t offset);
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ssize_t safe_writev(int fd, const struct iovec *iov, int iovcnt);
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ssize_t safe_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
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2022-02-01 00:10:10 +01:00
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/* read(2) */
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static abi_long do_bsd_read(abi_long arg1, abi_long arg2, abi_long arg3)
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{
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abi_long ret;
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void *p;
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p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
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if (p == NULL) {
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return -TARGET_EFAULT;
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}
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ret = get_errno(safe_read(arg1, p, arg3));
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unlock_user(p, arg2, ret);
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return ret;
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}
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/* pread(2) */
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static abi_long do_bsd_pread(void *cpu_env, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
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{
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abi_long ret;
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void *p;
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p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
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if (p == NULL) {
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return -TARGET_EFAULT;
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}
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if (regpairs_aligned(cpu_env) != 0) {
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arg4 = arg5;
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arg5 = arg6;
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}
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ret = get_errno(safe_pread(arg1, p, arg3, target_arg64(arg4, arg5)));
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unlock_user(p, arg2, ret);
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return ret;
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}
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/* readv(2) */
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static abi_long do_bsd_readv(abi_long arg1, abi_long arg2, abi_long arg3)
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{
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abi_long ret;
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struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
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if (vec != NULL) {
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ret = get_errno(safe_readv(arg1, vec, arg3));
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unlock_iovec(vec, arg2, arg3, 1);
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} else {
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ret = -host_to_target_errno(errno);
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}
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return ret;
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}
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/* preadv(2) */
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static abi_long do_bsd_preadv(void *cpu_env, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
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{
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abi_long ret;
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struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 1);
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if (vec != NULL) {
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if (regpairs_aligned(cpu_env) != 0) {
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arg4 = arg5;
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arg5 = arg6;
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}
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ret = get_errno(safe_preadv(arg1, vec, arg3, target_arg64(arg4, arg5)));
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unlock_iovec(vec, arg2, arg3, 0);
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} else {
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ret = -host_to_target_errno(errno);
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}
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return ret;
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}
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2022-02-01 00:34:03 +01:00
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/* write(2) */
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static abi_long do_bsd_write(abi_long arg1, abi_long arg2, abi_long arg3)
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{
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abi_long nbytes, ret;
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void *p;
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/* nbytes < 0 implies that it was larger than SIZE_MAX. */
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nbytes = arg3;
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if (nbytes < 0) {
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return -TARGET_EINVAL;
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}
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p = lock_user(VERIFY_READ, arg2, nbytes, 1);
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if (p == NULL) {
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return -TARGET_EFAULT;
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}
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ret = get_errno(safe_write(arg1, p, arg3));
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unlock_user(p, arg2, 0);
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return ret;
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}
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/* pwrite(2) */
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static abi_long do_bsd_pwrite(void *cpu_env, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
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{
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abi_long ret;
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void *p;
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p = lock_user(VERIFY_READ, arg2, arg3, 1);
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if (p == NULL) {
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return -TARGET_EFAULT;
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}
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if (regpairs_aligned(cpu_env) != 0) {
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arg4 = arg5;
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arg5 = arg6;
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}
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ret = get_errno(safe_pwrite(arg1, p, arg3, target_arg64(arg4, arg5)));
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unlock_user(p, arg2, 0);
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return ret;
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}
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/* writev(2) */
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static abi_long do_bsd_writev(abi_long arg1, abi_long arg2, abi_long arg3)
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{
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abi_long ret;
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struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
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if (vec != NULL) {
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ret = get_errno(safe_writev(arg1, vec, arg3));
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unlock_iovec(vec, arg2, arg3, 0);
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} else {
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ret = -host_to_target_errno(errno);
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}
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return ret;
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}
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/* pwritev(2) */
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static abi_long do_bsd_pwritev(void *cpu_env, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
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{
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abi_long ret;
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struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
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if (vec != NULL) {
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if (regpairs_aligned(cpu_env) != 0) {
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arg4 = arg5;
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arg5 = arg6;
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}
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ret = get_errno(safe_pwritev(arg1, vec, arg3, target_arg64(arg4, arg5)));
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unlock_iovec(vec, arg2, arg3, 0);
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} else {
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ret = -host_to_target_errno(errno);
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}
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return ret;
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}
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2022-06-12 05:32:19 +02:00
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/* open(2) */
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static abi_long do_bsd_open(abi_long arg1, abi_long arg2, abi_long arg3)
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{
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abi_long ret;
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void *p;
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LOCK_PATH(p, arg1);
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ret = get_errno(safe_open(path(p), target_to_host_bitmask(arg2,
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fcntl_flags_tbl), arg3));
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UNLOCK_PATH(p, arg1);
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return ret;
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}
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/* openat(2) */
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static abi_long do_bsd_openat(abi_long arg1, abi_long arg2,
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abi_long arg3, abi_long arg4)
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{
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abi_long ret;
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void *p;
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LOCK_PATH(p, arg2);
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ret = get_errno(safe_openat(arg1, path(p),
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target_to_host_bitmask(arg3, fcntl_flags_tbl), arg4));
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UNLOCK_PATH(p, arg2);
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return ret;
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}
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/* close(2) */
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static inline abi_long do_bsd_close(abi_long arg1)
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{
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return get_errno(close(arg1));
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}
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2022-06-12 16:07:39 +02:00
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/* fdatasync(2) */
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static abi_long do_bsd_fdatasync(abi_long arg1)
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{
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return get_errno(fdatasync(arg1));
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}
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/* fsync(2) */
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static abi_long do_bsd_fsync(abi_long arg1)
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{
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return get_errno(fsync(arg1));
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}
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/* closefrom(2) */
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static abi_long do_bsd_closefrom(abi_long arg1)
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{
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closefrom(arg1); /* returns void */
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return get_errno(0);
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}
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2022-06-12 16:11:30 +02:00
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/* revoke(2) */
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static abi_long do_bsd_revoke(abi_long arg1)
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{
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abi_long ret;
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void *p;
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LOCK_PATH(p, arg1);
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ret = get_errno(revoke(p)); /* XXX path(p)? */
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UNLOCK_PATH(p, arg1);
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return ret;
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}
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/* access(2) */
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static abi_long do_bsd_access(abi_long arg1, abi_long arg2)
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{
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abi_long ret;
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void *p;
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LOCK_PATH(p, arg1);
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ret = get_errno(access(path(p), arg2));
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UNLOCK_PATH(p, arg1);
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return ret;
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}
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/* eaccess(2) */
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static abi_long do_bsd_eaccess(abi_long arg1, abi_long arg2)
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{
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abi_long ret;
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void *p;
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LOCK_PATH(p, arg1);
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ret = get_errno(eaccess(path(p), arg2));
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UNLOCK_PATH(p, arg1);
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return ret;
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}
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/* faccessat(2) */
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static abi_long do_bsd_faccessat(abi_long arg1, abi_long arg2,
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abi_long arg3, abi_long arg4)
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{
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abi_long ret;
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void *p;
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LOCK_PATH(p, arg2);
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ret = get_errno(faccessat(arg1, p, arg3, arg4)); /* XXX path(p)? */
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UNLOCK_PATH(p, arg2);
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return ret;
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}
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2022-06-12 16:13:34 +02:00
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/* chdir(2) */
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static abi_long do_bsd_chdir(abi_long arg1)
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{
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abi_long ret;
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void *p;
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LOCK_PATH(p, arg1);
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ret = get_errno(chdir(p)); /* XXX path(p)? */
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UNLOCK_PATH(p, arg1);
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return ret;
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}
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/* fchdir(2) */
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static abi_long do_bsd_fchdir(abi_long arg1)
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{
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return get_errno(fchdir(arg1));
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}
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2022-05-06 15:49:09 +02:00
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#endif /* BSD_FILE_H */
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