int
cloudabi_sys_fd_stat_get(struct thread *td,
struct cloudabi_sys_fd_stat_get_args *uap)
{
cloudabi_fdstat_t fsb = {};
struct filedesc *fdp;
struct file *fp;
seq_t seq;
cap_rights_t rights;
int error, oflags;
bool modified;
/* Obtain file descriptor properties. */
fdp = td->td_proc->p_fd;
do {
error = fget_unlocked(fdp, uap->fd, cap_rights_init(&rights),
&fp, &seq);
if (error != 0)
return (error);
if (fp->f_ops == &badfileops) {
fdrop(fp, td);
return (EBADF);
}
rights = *cap_rights(fdp, uap->fd);
oflags = OFLAGS(fp->f_flag);
fsb.fs_filetype = cloudabi_convert_filetype(fp);
modified = fd_modified(fdp, uap->fd, seq);
fdrop(fp, td);
} while (modified);
/* Convert file descriptor flags. */
if (oflags & O_APPEND)
fsb.fs_flags |= CLOUDABI_FDFLAG_APPEND;
if (oflags & O_NONBLOCK)
fsb.fs_flags |= CLOUDABI_FDFLAG_NONBLOCK;
if (oflags & O_SYNC)
fsb.fs_flags |= CLOUDABI_FDFLAG_SYNC;
/* Convert capabilities to CloudABI rights. */
convert_capabilities(&rights, fsb.fs_filetype,
&fsb.fs_rights_base, &fsb.fs_rights_inheriting);
return (copyout(&fsb, (void *)uap->buf, sizeof(fsb)));
}
/*
* Convert a user file descriptor to a kernel file entry and check if required
* capability rights are present.
* A reference on the file entry is held upon returning.
*/
int
getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
struct file **fpp, u_int *fflagp)
{
struct file *fp;
int error;
error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL);
if (error != 0)
return (error);
if (fp->f_type != DTYPE_SOCKET) {
fdrop(fp, td);
return (ENOTSOCK);
}
if (fflagp != NULL)
*fflagp = fp->f_flag;
*fpp = fp;
return (0);
}
