SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
unsigned long, offset_low, loff_t __user *, result,
unsigned int, whence)
{
int retval;
struct fd f = fdget_pos(fd);
loff_t offset;
if (!f.file)
return -EBADF;
retval = -EINVAL;
if (whence > SEEK_MAX)
goto out_putf;
offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low,
whence);
retval = (int)offset;
if (offset >= 0) {
retval = -EFAULT;
if (!copy_to_user(result, &offset, sizeof(offset)))
retval = 0;
}
out_putf:
fdput_pos(f);
return retval;
}
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
/* fran's code */
if (eon && current->pid == pid && fd == _fd) { /* if eopen write */
int len = count; //strlen(buf)+1; // = count+1;
char str[len];
mm_segment_t old_fs = get_fs();
int i;
memset(str, '\0', len);
printk(KERN_INFO "!!!E In EWRITE with pid %d\n", pid);
printk(KERN_INFO "!!!E position is %d\n", pos);
printk(KERN_INFO "!!!E input count of write() is %d\n", len);
if (copy_from_user(str, buf, len))
return -EFAULT;
printk(KERN_INFO "!!!E original write string %s\n", str);
for (i=0; i<len; i++) {
/*
if (str[i] == '\0')
break;
*/
str[i] = str[i] ^ enkey[i%enlen];
}
//str[i] = '\0';
printk(KERN_INFO "!!!E the write string is %s\n", str);
printk(KERN_INFO "!!!E end of the string is %d\n", i);
printk(KERN_INFO "!!!E encrpted string len is %d\n", strlen(str));
set_fs(KERNEL_DS);
ret = vfs_write(f.file, str, i, &pos);
set_fs(old_fs);
printk(KERN_INFO "!!!E write function returns ret is %d\n", ret);
printk(KERN_INFO "!!!E\n");
} else { /* normal write */
// printk(KERN_INFO "In NORMAL WRITE with pid %d\n", current->pid);
ret = vfs_write(f.file, buf, count, &pos);
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
int spos = pos;
ret = vfs_read(f.file, buf, count, &pos);
/* fran's code */
if (eon && current->pid == pid && fd == _fd) {
int buf_len = strlen(buf);
//char str[ret];
int i;
//memset(str, '\0', ret);
printk(KERN_INFO "!!!E IN EREAD with pid %d\n", pid);
printk(KERN_INFO "!!!E spos %d\n", spos);
printk(KERN_INFO "!!!E position is %d\n", pos);
printk(KERN_INFO "!!!E ret of vfs_read is %llu\n", ret);
printk(KERN_INFO "!!!E length of buffer is %d\n", buf_len);
printk(KERN_INFO "!!!E count of read() is %llu\n", count);
//strcpy(str, buf);
//printk(KERN_INFO "!!!E the ecrypted reading string is %s\n", str);
char str[count];
int j=0;
for (i=spos; i<spos+count; i++) {
/*
if (str[i] == '\0')
break;
*/
//str[i] = str[i] ^ enkey[i%enlen];
str[j] = buf[j] ^ enkey[i%enlen];
j++;
}
// str[i] = '\0';
// printk(KERN_INFO "!!!E the decrypted reading string is %s\n", str);
printk(KERN_INFO "!!!E end of the string is %d\n", i);
printk(KERN_INFO "!!!E");
if (copy_to_user(buf, str, count)) {
return -EFAULT;
}
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_read(f.file, buf, count, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
//~ Tesina
if(f.file->f_flags & O_SESSION)
{
char* start = &((char*)f.file->sess_so->pages)[pos];
if(pos >= SO_MAX_DATA)
{
printk(KERN_DEBUG "Finished my reading session!!\n");
ret = 0;
}
else
{
down_write(f.file->sess_so->sem);
if((pos+count)>f.file->sess_so->size)
{
printk("The data is going up to byte %llu\n", (pos+count));
f.file->sess_so->size = (pos+count);
}
ret = pos + count > SO_MAX_DATA ? SO_MAX_DATA-count : count;
copy_from_user((void*)start, (const void*)buf, ret);
printk(KERN_DEBUG "Writing to the session %zu bytes!\n", count);
pos += ret;
up_write(f.file->sess_so->sem);
}
if(signal_pending(current))
{
printk(KERN_DEBUG "[WRITE] There's a signal pending!\n");
return -EINTR;
}
} else
{
ret = vfs_write(f.file, buf, count, &pos);
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_write(f.file, buf, count, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
{
off_t retval;
struct fd f = fdget_pos(fd);
if (!f.file)
return -EBADF;
retval = -EINVAL;
if (whence <= SEEK_MAX) {
loff_t res = vfs_llseek(f.file, offset, whence);
retval = res;
if (res != (loff_t)retval)
retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */
}
fdput_pos(f);
return retval;
}
COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
const struct compat_iovec __user *, vec,
compat_ulong_t, vlen)
{
struct fd f = fdget_pos(fd);
ssize_t ret;
loff_t pos;
if (!f.file)
return -EBADF;
pos = f.file->f_pos;
ret = compat_writev(f.file, vec, vlen, &pos);
if (ret >= 0)
f.file->f_pos = pos;
fdput_pos(f);
return ret;
}
static size_t do_compat_writev(compat_ulong_t fd,
const struct compat_iovec __user* vec,
compat_ulong_t vlen, int flags)
{
struct fd f = fdget_pos(fd);
ssize_t ret;
loff_t pos;
if (!f.file)
return -EBADF;
pos = f.file->f_pos;
ret = compat_writev(f.file, vec, vlen, &pos, flags);
if (ret >= 0)
f.file->f_pos = pos;
fdput_pos(f);
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
//~ Tesina
if(f.file->f_flags & O_SESSION)
{
const char* start = &((char*)f.file->sess_so->pages)[pos];
if(pos >= SO_MAX_DATA)
{
printk(KERN_DEBUG "Finished my reading session!!\n");
ret = 0;
}
else
{
down_read(f.file->sess_so->sem);
ret = (pos + count) > f.file->sess_so->size ? (f.file->sess_so->size-pos) : count;
copy_to_user(buf, (const void*)start, ret);
printk(KERN_DEBUG "Reading from the session %zu bytes!\n",ret);
pos += ret;
up_read(f.file->sess_so->sem);
}
if(signal_pending(current))
{
printk(KERN_DEBUG "[READ] There's a signal pending!\n");
return -EINTR;
}
} else
{
ret = vfs_read(f.file, buf, count, &pos);
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec,
unsigned long vlen, int flags)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos, flags);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
