static int open_fifofs(struct vfs_node_t* node, int oflag, mode_t mode)
{
(void)mode;
struct fifofs_hdr_t* hdr = fifofs_nodes[node->status.st_ino];
/* POSIX leaves behavior undefined when using O_RDWR, so we treat
* it as O_RDONLY */
if ((oflag & O_ACCMODE) == O_RDWR)
oflag &= ~O_WRONLY; /* Remove writable flag */
if (oflag & O_RDONLY) /* Opening the read end */
{
hdr->readers++;
/* Do not block if we are in non-blocking mode */
if (!(oflag & O_NONBLOCK))
{
/* Wait until there is a writer */
while(hdr->writers < 1)
sched_switch();
}
/* Now we have a writer so we can return */
return get_free_fd(3);
}
else if (oflag & O_WRONLY) /* Opening the write end */
{
hdr->writers++;
/* Wait until there is a reader */
while(hdr->readers < 1)
{
/* Or fail if we are in non-blocking mode */
if (oflag & O_NONBLOCK)
{
errno = ENXIO;
return -1;
}
sched_switch();
}
/* Now we have a reader -> return */
return get_free_fd(3);
}
else
return -1;
}
fd_t Ext2FS::open(const char * path, const char * mode)
{
fd_t new_fd = get_free_fd();
if(new_fd < 0)
return -1;
mark_fd_as_used(new_fd);
// We ignore mode
struct Ext2FSInode * inode = inode_for_path(path);
assert(inode != NULL);
std::cerr << *inode << std::endl;
if(inode == NULL)
return -1;
_open_files[new_fd] = *inode;
delete inode;
_seek_memory[new_fd] = 0;
return new_fd;
}
int sfs_fopen(char *name)
{
int inode_num, fd, i;
inode_struct* inode;
directory_map new_file;
inode_num = get_inode_num_by_name(name);
// Check if file is already open
for(i = 1; i < MAXOPENFILES; i++) {
if( (fd_table[i].status == USED) && (fd_table[i].inode_num == inode_num)) return i;
}
fd = get_free_fd();
if(fd == -1) return -1;
if(inode_num == -1) // File does not exist, create file
{
// Allocate i-node
inode_num = get_free_inode_num();
inode = calloc(1, sizeof(inode_struct));
// Add new file to directory
new_file.inode_num = inode_num;
strcpy(new_file.file_name, name);
// Seek to end of directory and write new file entry
fd_table[ROOTFD].rw_pointer = fd_table[ROOTFD].inode->size;
sfs_fwrite(ROOTFD, (char*)&new_file, sizeof(directory_map));
write_inode_by_index(fd_table[ROOTFD].inode_num, fd_table[ROOTFD].inode);
} else {
inode = get_inode_by_index(inode_num);
}
fd_table[fd].inode_num = inode_num;
fd_table[fd].inode = inode;
fd_table[fd].rw_pointer = inode->size;
return fd;
}
