int
do_open(const char *path, int mode)
{
int fd;
struct file *f;
struct inode *ip;
if ((mode & O_CREATE) &&!(ip =
icreate(path, T_FILE, 0, 0)))
return -1;
else
if (!(ip = namei(path)))
return -1;
if (ip->type == T_DIR && mode != O_RDONLY) {
iput(ip);
return -1;
}
if (!(f = filealloc()) || (fd = fdalloc()) < 0) {
if (f)
fileclose(f);
iput(ip);
return -1;
}
f->type = FD_INODE;
f->ip = ip;
f->off = 0;
f->readable = !(mode & O_WRONLY);
f->writable = (mode & O_WRONLY) || (mode & O_RDWR);
fs_current->ofile[fd] = f;
return fd;
}
int
sys_dup(struct file *f)
{
int fd;
if(argfd(0, 0, &f) < 0)
return -1;
if((fd=fdalloc(f)) < 0)
return -1;
filedup(f);
return fd;
}
int sys_getcwd()
{
struct inode *ip = idup(current_proc->cwd);
struct file * f = filealloc();
f->in = ip;
f->offset = 0;
f->type = FD_INODE;
f->rw = FD_READABLE;
int fd = fdalloc(f);
if(fd > 0)
return fd;
return -1;
}
static int
sysvipc_install_fd(struct proc *p_from, struct proc *p_to, int fd)
{
struct filedesc *fdp_from = p_from->p_fd;
struct filedesc *fdp_to = p_to->p_fd;
struct file *fp;
int error, newfd;
int flags;
/*
* Get the file corresponding to fd from the process p_from.
*/
spin_lock(&fdp_from->fd_spin);
if ((unsigned)fd >= fdp_from->fd_nfiles || fdp_from->fd_files[fd].fp == NULL) {
spin_unlock(&fdp_from->fd_spin);
return (EBADF);
}
fp = fdp_from->fd_files[fd].fp;
flags = fdp_from->fd_files[fd].fileflags;
fhold(fp); /* MPSAFE - can be called with a spinlock held */
spin_unlock(&fdp_from->fd_spin);
/*
* Reserve a fd in the process p_to.
*/
error = fdalloc(p_to, 1, &newfd);
if (error) {
fdrop(fp);
return (error);
}
/*
* Set fd for the fp file.
*/
fsetfd(fdp_to, fp, newfd);
fdp_to->fd_files[newfd].fileflags = flags;
fdrop(fp);
return (newfd);
}
