int sys_open(const char *filename, int flag, int mode)
{
//TODO Check access
int fd, status;
FILE *f;
if (!access_ok(VERIFY_READ, filename, VERIFY_STRLEN)) return -EFAULT;
for (fd = 0; fd < NR_OPEN; fd++)
if (!current_task->files[fd]) break;
if (fd >= NR_OPEN) return -EMFILE;
f = malloc(sizeof(FILE));
f->flags = 0;
f->node = namei(filename, &status);
if (!f->node) {
free(f);
return status;
}
if (flag & O_APPEND) f->offset = f->node->size;
else f->offset = 0;
/////////////////////////////////////
// A lot more goes here and there an everywhere
/////////////////////////////////////
if ((!(flag & 3)) || (flag & O_RDWR)) f->flags |= FMODE_READ;
if ((flag & O_WRONLY) || (flag & O_RDWR)) f->flags |= FMODE_WRITE;
open_fs(f->node, f);
f->count = 1;
current_task->close_on_exec &= ~(1 << fd);
f->fd = fd;
current_task->files[fd] = f;
return fd;
}
int main(int argc, char *argv[]){
if(argc != 2){
printf("usage:\ntouch file\n");
return 1;
}
putenv("LOCALFS=some_fs.filesystem");
char *fs_name = getenv("LOCALFS");
struct fs *file_system;
file_system = open_fs(fs_name);
char *file = get_file(file_system, argv[1]);
if(file == NULL){
//create the file
create_file(file_system, argv[1], "", 0, 0x0000);
} else {
// update the timestamp on the file
update_timestamp(file_system, argv[1]);
}
close_fs(file_system);
return 1;
}
static int sys_mkpipe(void) {
fs_node_t * node = make_pipe(4096 * 2);
open_fs(node, 0);
int fd = process_append_fd((process_t *)current_process, node);
FD_MODE(fd) = 03; /* read write */
return fd;
}
static int sys_mkpipe(void) {
fs_node_t * node = make_pipe(4096 * 2);
open_fs(node, 0);
return process_append_fd((process_t *)current_process, node);
}