sanchayanmaity/xv6-cs450
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

formatting shuffle

Browse source
This commit is contained in:
rsc 2007-08-27 14:37:13 +00:00
parent 1ccff18b24
commit 13491bf367
1 changed files with 39 additions and 42 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

81
file.c
View file

@ -52,6 +52,45 @@ filedup(struct file *f)
return f;
}
// Close file f. (Decrement ref count, close when reaches 0.)
void
fileclose(struct file *f)
{
struct file ff;
acquire(&file_table_lock);
if(f->ref < 1 || f->type == FD_CLOSED)
panic("fileclose");
if(--f->ref > 0){
release(&file_table_lock);
return;
}
ff = *f;
f->ref = 0;
f->type = FD_CLOSED;
release(&file_table_lock);
if(ff.type == FD_PIPE)
pipe_close(ff.pipe, ff.writable);
else if(ff.type == FD_INODE)
iput(ff.ip);
else
panic("fileclose");
}
// Get metadata about file f.
int
filestat(struct file *f, struct stat *st)
{
if(f->type == FD_INODE){
ilock(f->ip);
stati(f->ip, st);
iunlock(f->ip);
return 0;
}
return -1;
}
// Read from file f. Addr is kernel address.
int
fileread(struct file *f, char *addr, int n)
@ -92,45 +131,3 @@ filewrite(struct file *f, char *addr, int n)
panic("filewrite");
}
// Get metadata about file f.
int
filestat(struct file *f, struct stat *st)
{
if(f->type == FD_INODE){
ilock(f->ip);
stati(f->ip, st);
iunlock(f->ip);
return 0;
}
return -1;
}
// Close file f. (Decrement ref count, close when reaches 0.)
void
fileclose(struct file *f)
{
struct file ff;
acquire(&file_table_lock);
if(f->ref < 1 || f->type == FD_CLOSED)
panic("fileclose");
if(--f->ref > 0){
release(&file_table_lock);
return;
}
ff = *f;
f->ref = 0;
f->type = FD_CLOSED;
release(&file_table_lock);
if(ff.type == FD_PIPE)
pipe_close(ff.pipe, ff.writable);
else if(ff.type == FD_INODE)
iput(ff.ip);
else
panic("fileclose");
}