uint32_t read(int fd, void* buf, uint32_t count) {
if (!tasking_installed()) {
return -1;
}
if (!count) {
return 0;
}
unsigned char* chbuf = buf;
memset(chbuf, 0, count);
//find fd_entry corresponding to this fd
task_t* current = task_with_pid(getpid());
fd_entry ent = current->fd_table[fd];
if (fd_empty(ent)) {
//errno = EBADF;
return -1;
}
//what type of file descriptor is this?
//dispatch appropriately
switch (ent.type) {
case STD_TYPE:
return std_read(current, fd, buf, count);
case FILE_TYPE:
return fread(buf, sizeof(char), count, (FILE*)ent.payload);
case PIPE_TYPE:
default:
return pipe_read(fd, buf, count);
}
return -1;
}
bool cps_api_receive_data(cps_api_channel_t handle, void *data, size_t len) {
t_std_error msg_rc = STD_ERR_OK;
int by = std_read(handle,data,len,true,&msg_rc);
bool rc = (by==(int)len) ;
if (!rc) {
EV_LOG(TRACE,DSAPI,0,"CPS IPC","Was not able to read the data. (%X)",msg_rc);
}
return rc;
}
bool cps_api_receive_header(cps_api_channel_t handle, uint32_t &op,
size_t &len) {
cps_msg_hdr_t hdr;
t_std_error rc = STD_ERR_OK;
int by = std_read(handle,&hdr,sizeof(hdr),true,&rc);
if (by == 0) {
return false;
}
if (by!=sizeof(hdr)) {
EV_LOG(TRACE,DSAPI,0,"CPS IPC","Was not able to read the header.");
return false;
}
op = hdr.operation;
len = hdr.len;
return true;
}
cps_api_object_t cps_api_receive_object(cps_api_channel_t handle,size_t len) {
if (len==0) return NULL;
cps_api_object_guard og(cps_api_object_create());
t_std_error rc = STD_ERR_OK;
do {
if (cps_api_object_get_reserve_len(og.get()) < len) {
if (!cps_api_object_reserve(og.get(),len)) break;
}
int by = std_read(handle,cps_api_object_array(og.get()),len,true,&rc);
if (by!=(int)len) break;
if (!cps_api_object_received(og.get(),len)) break;
return og.release();
} while (0);
EV_LOG(ERR,DSAPI,0,"CPS IPC","Was not able to read the object - MSG (%X)",rc);
return NULL;
}