int
sys_shmget(struct proc *p, void *v, register_t *retval)
{
struct sys_shmget_args /* {
syscallarg(key_t) key;
syscallarg(size_t) size;
syscallarg(int) shmflg;
} */ *uap = v;
int segnum, mode, error;
mode = SCARG(uap, shmflg) & ACCESSPERMS;
if (SCARG(uap, key) != IPC_PRIVATE) {
again:
segnum = shm_find_segment_by_key(SCARG(uap, key));
if (segnum >= 0)
return (shmget_existing(p, uap, mode, segnum, retval));
if ((SCARG(uap, shmflg) & IPC_CREAT) == 0)
return (ENOENT);
}
error = shmget_allocate_segment(p, uap, mode, retval);
if (error == EAGAIN)
goto again;
return (error);
}
/* Handle a shmget() request. */
int
handle_shmget(pid_t pid, struct shmget_msg *shmget_msg,
struct cmsgcred *cred ) {
int segnum, mode, error;
struct shmid_ds *shmseg;
struct shm_handle *handle;
//if (!jail_sysvipc_allowed && td->td_cmsgcred->cr_prison != NULL)
// return (ENOSYS);
mode = shmget_msg->shmflg & ACCESSPERMS;
sysvd_print("ask for key = %ld\n", shmget_msg->key);
shmget_msg->key = (shmget_msg->key & 0x3FFF) |
(shmget_msg->type << 30);
sysvd_print("ask for key = %ld\n", shmget_msg->key);
if (shmget_msg->key != IPC_PRIVATE) {
//again:
segnum = shm_find_segment_by_key(shmget_msg->key);
if (segnum >= 0) {
error = shmget_existing(shmget_msg, mode, segnum, cred);
//TODO if daemon is multithreading
//if (error == EAGAIN)
// goto again;
goto done;
}
if ((shmget_msg->shmflg & IPC_CREAT) == 0) {
error = -ENOENT;
goto done_err;
}
}
error = shmget_allocate_segment(pid, shmget_msg, mode, cred);
sysvd_print("allocate segment = %d\n", error);
done:
/*
* Install to th client the file corresponding to the
* shared memory segment.
* client_fd is the file descriptor added in the client
* files table.
*/
shmseg = shm_find_segment_by_shmid(error);
if (shmseg == NULL) {
sysvd_print_err("can not find segment by shmid\n");
return (-1);
}
handle = (struct shm_handle *)shmseg->shm_internal;
if (install_fd_client(pid, handle->fd) != 0)
error = errno;
done_err:
return (error);
}
