int16_t _open(void)
{
int8_t uindex;
int8_t oftindex;
staticfast inoptr ino;
inoptr itmp;
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 {
/* 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;
}
}
of_tab[oftindex].o_inode = ino;
perm = getperm(ino);
if ((r && !(perm & OTH_RD)) || (w && !(perm & OTH_WR))) {
udata.u_error = EPERM;
goto cantopen;
}
if (getmode(ino) == F_DIR && w) {
udata.u_error = EISDIR;
goto cantopen;
}
itmp = ino;
/* d_open may block and thus ino may become invalid as may
parent (but we don't need it again) */
if (isdevice(ino)
&& d_open((int) ino->c_node.i_addr[0], flag) != 0) {
udata.u_error = ENXIO;
goto cantopen;
}
/* get the static pointer back */
ino = itmp;
if (trunc && getmode(ino) == F_REG) {
f_trunc(ino);
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);
}
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 || parent == NULL)
goto cantopen;
/* New file */
if (!(flag & O_CREAT)) {
udata.u_error = ENOENT;
goto cantopen;
}
filename(name, fname);
/* newfile drops parent for us */
ino = newfile(parent, fname);
if (!ino) {
/* on error, newfile sets udata.u_error */
goto cantopen;
}
/* new inode, successfully created */
ino->c_node.i_mode =
(F_REG | (mode & MODE_MASK & ~udata.u_mask));
setftime(ino, A_TIME | M_TIME | C_TIME);
wr_inode(ino);
}
/* 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) == MODE_R(F_DIR)) {
udata.u_error = EISDIR;
goto cantopen;
}
/* Special case - devices on a read only file system may
be opened read/write */
if (!isdevice(ino) && (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 (w && trunc && getmode(ino) == MODE_R(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);
if (O_ACCMODE(flag) != O_RDONLY)
ino->c_writers++;
if (O_ACCMODE(flag) != O_WRONLY)
ino->c_readers++;
/* FIXME: ATIME ? */
/*
* Sleep process if no writer or reader.
* FIXME: check for other of pair now we have proper counts
*/
if (getmode(ino) == MODE_R(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);
}
