//params: user_ip -> filepath -> mode
return_type sOpen(const int nparams, arg_type* a){
// if (nparams != 4) {
// r.return_val = NULL;
// r.return_size = 0;
// return r;
// }
char *user_ip = (char *)a->arg_val;
char *alias = (char *)a->next->arg_val;
char *filepath = (char *)a->next->next->arg_val;
char *fullpath = prependRootName(filepath);
int mode = *(int *)a->next->next->next->arg_val;
if(debug)printf("fullpath on server: %s\n", fullpath);
if (checkFileInUse(fullpath) == 1){
if(debug)printf("file in use");
return createReturn(26, -1);
}
// Check if user is mounted
MountedUser *mounted = findMount(user_ip, alias);
if (mounted == NULL){
return createReturn(1, -1);
}
// If the file does not exist or is a folder return error
struct stat buffer;
int err = stat(fullpath, &buffer);
if(debug)printf("errval: %d\n", err);
if (err == -1 && mode == 0){
if(debug)printf("cannot open in read mode\n");
return createReturn(err, 0);
}
if (S_ISDIR(buffer.st_mode)){
if(debug)printf("wtf its a folder\n");
return createReturn(21, 0);
}
int fd;
if (mode == 1) {
fd = open(fullpath, O_CREAT | O_RDWR | O_APPEND | O_TRUNC, S_IRUSR | S_IWUSR);
}else {
fd = open(fullpath, O_RDONLY | S_IRUSR);
}
if(debug)printf("the fd is %d\n", fd);
// Can just add struct because we know it doesn't exist from checkFileInUse
if (addOpenFile(user_ip, alias, fd, fullpath) != 0){
if(debug)printf("closing the file descriptor %d because of error\n", fd);
close(fd);
return createReturn(1, -1);
}
return createReturn(0, fd);
}
void CheckedFile::open( int access, int permission )
//--------------------------------------------------
{
CheckedFile * closeIt; // file to be closed when out of handles
if( !_isOpen ) {
_openAccess = access;
_openPermission = permission;
while( _openFiles->size() >= MaxOpenReadFiles ) {
closeIt = _openFiles->back();
closeIt->privClose();
removeOpenFile( closeIt );
}
_handle = ::open( _fileName, _openAccess, _openPermission );
while( _handle == -1 && errno == EMFILE ) {
if( _openFiles->size() == 0 ) {
FileExcept oops( FileExcept::Open, errno, _fileName );
throw( oops );
}
closeIt = _openFiles->back();
closeIt->privClose();
removeOpenFile( closeIt );
_handle = ::open( _fileName, _openAccess, _openPermission );
}
if( _handle == -1 ) { // error other than out of handles
FileExcept oops( FileExcept::Open, errno, _fileName );
throw( oops );
}
_isOpen = TRUE;
_logOpen = TRUE;
_currOffset = 0;
if( !( _openAccess & O_WRONLY ) ) {
addOpenFile( this );
}
}
}
int openDir(int fd, char *dname){
struct INode parent_in;
struct InCoreINode* icn;
struct DirEntry d;
readINode(fd, currDirINode, &parent_in);
// Tokenize the name and find its inode no
int linkNo = fileExists(fd, dname, parent_in, &d);
if( linkNo==-1 ){
printf("No such directory exists!\n");
return -1;
}
int dirhandle = isOpen(d.d_entry.d_inode, icn);
if( dirhandle!=-1 )
return dirhandle;
// Add the inode to open file object DLL and return the reference number
return addOpenFile(fd, d.d_entry.d_inode);
}
