arg_t _pipe(void)
{
int8_t u1, u2, oft1, oft2;
inoptr ino;
/* bug fix SN */
if ((u1 = uf_alloc()) == -1)
goto nogood;
if ((oft1 = oft_alloc()) == -1)
goto nogood;
udata.u_files[u1] = oft1;
if ((u2 = uf_alloc()) == -1)
goto nogood2;
if ((oft2 = oft_alloc()) == -1)
goto nogood2;
if (!(ino = i_open(root_dev, 0))) {
oft_deref(oft2);
goto nogood2;
}
udata.u_files[u2] = oft2;
of_tab[oft1].o_ptr = 0;
of_tab[oft1].o_inode = ino;
of_tab[oft1].o_access = O_RDONLY;
of_tab[oft2].o_ptr = 0;
of_tab[oft2].o_inode = ino;
of_tab[oft2].o_access = O_WRONLY;
++ino->c_refs;
ino->c_node.i_mode = F_PIPE | 0777; /* No permissions necessary on pipes */
ino->c_node.i_nlink = 0; /* a pipe is not in any directory */
// write results to userspace
uputw(u1, fildes);
uputw(u2, fildes + 1);
return (0);
nogood2:
oft_deref(oft1);
udata.u_files[u1] = NO_FILE;
nogood:
return (-1);
}
arg_t make_socket(struct sockinfo *s, struct socket **np)
{
struct socket *n;
int8_t uindex;
int8_t oftindex;
inoptr ino;
/* RAW sockets are superuser */
if (s->priv && esuper())
return -1;
if (np)
n = *np;
else {
n = alloc_socket();
if (n == NULL)
return -1;
}
n->s_type = s - socktypes; /* Pointer or uint8_t best ? */
n->s_state = SS_INIT;
if (net_init(n) == -1)
goto nosock;
/* Start by getting the file and inode table entries */
if ((uindex = uf_alloc()) == -1)
goto nosock;
if ((oftindex = oft_alloc()) == -1)
goto nooft;
/* We need an inode : FIXME - do we want a pipedev aka Unix ? */
if (!(ino = i_open(root_dev, 0)))
goto noalloc;
/* All good - now set it up */
/* The nlink cheat needs to be taught to fsck! */
ino->c_node.i_mode = F_SOCK | 0777;
ino->c_node.i_nlink = n->s_num; /* Cheat !! */
ino->c_readers = 1;
ino->c_writers = 1;
of_tab[oftindex].o_inode = ino;
of_tab[oftindex].o_access = O_RDWR;
udata.u_files[uindex] = oftindex;
sock_wait_leave(n, 0, SS_INIT);
if (np)
*np = n;
return uindex;
noalloc:
oft_deref(oftindex); /* Will call i_deref! */
nooft:
udata.u_files[uindex] = NO_FILE;
nosock:
n->s_state = SS_UNUSED;
return -1;
}
arg_t _dup(void)
{
int8_t newd;
if (getinode(oldd) == NULLINODE)
return (-1);
if ((newd = uf_alloc()) == -1)
return (-1);
udata.u_files[newd] = udata.u_files[oldd];
++of_tab[udata.u_files[oldd]].o_refs;
return (newd);
}
arg_t make_socket(struct sockinfo *s, int8_t *np)
{
int8_t n;
int8_t uindex;
int8_t oftindex;
inoptr ino;
/* RAW sockets are superuser */
if (s->priv && esuper())
return -1;
/* Start by getting the file and inode table entries */
if ((uindex = uf_alloc()) == -1)
return -1;
if ((oftindex = oft_alloc()) == -1)
goto nooft;
if (np)
n = *np;
else {
n = alloc_socket();
if (n == -1)
goto noalloc;
}
/* We need an inode : FIXME - do we want a pipedev aka Unix ? */
if (!(ino = i_open(root_dev, 0)))
goto noalloc;
/* All good - now set it up */
/* The nlink cheat needs to be taught to fsck! */
ino->c_node.i_mode = F_SOCK | 0777;
ino->c_node.i_nlink = n; /* Cheat !! */
of_tab[oftindex].o_inode = ino;
of_tab[oftindex].o_access = O_RDWR;
udata.u_files[uindex] = oftindex;
sockets[n].s_inode = ino;
sockets[n].s_type = s - socktypes; /* Pointer or uint8_t best ? */
sockets[n].s_state = SS_UNCONNECTED;
if (np)
*np = n;
return uindex;
noalloc:
oft_deref(oftindex); /* Will call i_deref! */
nooft:
udata.u_files[uindex] = NO_FILE;
return -1;
}
arg_t _open(void)
{
int8_t uindex;
int8_t oftindex;
staticfast inoptr ino;
int16_t perm;
staticfast inoptr parent;
char fname[FILENAME_LEN + 1];
int trunc;
int r;
int w;
int j;
parent = NULLINODE;
trunc = flag & O_TRUNC;
r = (flag + 1) & 1;
w = (flag + 1) & 2;
if (O_ACCMODE(flag) == 3 || (flag & O_BADBITS)) {
udata.u_error = EINVAL;
return (-1);
}
if ((uindex = uf_alloc()) == -1)
return (-1);
if ((oftindex = oft_alloc()) == -1)
goto nooft;
ino = n_open(name, &parent);
if (ino) {
i_deref(parent);
/* O_EXCL test */
if ((flag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
udata.u_error = EEXIST;
goto idrop;
}
} else {
/* The n_open failed */
if (udata.u_error == EFAULT)
goto cantopen;
/* New file */
if (!(flag & O_CREAT)) {
udata.u_error = ENOENT;
goto cantopen;
}
filename(name, fname);
/* newfile drops parent for us */
if (parent && (ino = newfile(parent, fname))) {
ino->c_node.i_mode =
(F_REG | (mode & MODE_MASK & ~udata.u_mask));
setftime(ino, A_TIME | M_TIME | C_TIME);
wr_inode(ino);
} else {
udata.u_error = ENFILE; /* FIXME, should be set in newfile
not bodged to a guessed code */
goto cantopen;
}
}
/* Book our slot in case we block opening a device */
of_tab[oftindex].o_inode = ino;
perm = getperm(ino);
if ((r && !(perm & OTH_RD)) || (w && !(perm & OTH_WR))) {
udata.u_error = EACCES;
goto cantopen;
}
if (w) {
if (getmode(ino) == F_DIR ) {
udata.u_error = EISDIR;
goto cantopen;
}
if (ino->c_flags & CRDONLY) {
udata.u_error = EROFS;
goto cantopen;
}
}
if (isdevice(ino)) {
inoptr *iptr = &of_tab[oftindex].o_inode;
/* d_open may block and thus ino may become invalid as may
parent (but we don't need it again). It may also be changed
by the call to dev_openi */
if (dev_openi(iptr, flag) != 0)
goto cantopen;
/* May have changed */
/* get the static pointer back in case it changed via dev
usage or just because we blocked */
ino = *iptr;
}
if (trunc && getmode(ino) == F_REG) {
if (f_trunc(ino))
goto idrop;
for (j = 0; j < OFTSIZE; ++j)
/* Arguably should fix at read/write */
if (of_tab[j].o_inode == ino)
of_tab[j].o_ptr = 0;
}
udata.u_files[uindex] = oftindex;
of_tab[oftindex].o_ptr = 0;
of_tab[oftindex].o_access = flag; /* Save the low bits only */
if (flag & O_CLOEXEC)
udata.u_cloexec |= (1 << oftindex);
/* FIXME: ATIME ? */
/*
* Sleep process if no writer or reader
*/
if (getmode(ino) == F_PIPE && of_tab[oftindex].o_refs == 1
&& !(flag & O_NDELAY))
psleep(ino);
/* From the moment of the psleep ino is invalid */
return (uindex);
idrop:
i_deref(ino);
cantopen:
oft_deref(oftindex); /* This will call i_deref() */
nooft:
udata.u_files[uindex] = NO_FILE;
return (-1);
}