Just an update that this has happened: The new select() , BSD-like, is in the Freescale KSDK MQX 1.0.0, and will be in Freescale MQX 4.2.0. We have "RTCS_" prefix:
FD_SET --> RTCS_FD_SET
FD_CLR --> RTCS_FD_CLR
fs_set --> rtcs_fd_set
etc.
You will find these prototypes in the RTCS header file: rtcs_sock.h
For the select() function prototype we currently have:
int32_t select(int32_t nfds,
rtcs_fd_set *restrict readfds,
rtcs_fd_set *restrict writefds,
uint32_t timeout_ms);
so we do not support errorfds and our timeout is in milliseconds.
The default value for rtcs_fd_set_size: RTCSCFG_FD_SETSIZE in: rtcscfg.h. By default it is 8, if an application will create more sockets this value should be increased accordingly.
We still support backward compatibility with RTCS_selectset() and RTCS_selectall() when RTCSCFG_BACKWARD_COMPATIBILITY_RTCSSELECT build time option is TRUE (this is the default value).
All of our example applications have been completely migrated to use the new select(), so it is possible to compile RTCS library with RTCSCFG_BACKWARD_COMPATIBILITY_RTCSSELECT set to FALSE.
For complete reference, I attach the RTCS BSD-like select() documentation:
/*FUNCTION*-------------------------------------------------------------
*
* Function Name : select
* Parameters :
*
* int32_t nfds [IN] The first nfds socket handles
* are checked in each set; i.e.,
* the sockets from 0 through nfds-1
* in the descriptor sets are examined.
* rtcs_fd_set * readfds [IN/OUT]
* IN - array of pointers to SOCKET_STRUCT to examine for receive activity
* OUT - readfds contains the socket handles where activity
* has been detected
* rtcs_fd_set * writefds [IN/OUT]
* IN - array of pointers to SOCKET_STRUCT to examine for transmit activity
* OUT - writefds contains the socket handles where activity
* has been detected
* uint32_t timeout_ms [IN]
* if timeout_ms is zero, select() may block indefinitely.
* if timeout_ms is 0xFFFFFFFF, select() only polls the socket descriptors
* and returns when the actual status is determined.
* other values determine time limit in milliseconds that the select
* would block at max
*
* Comments : Due to the restrict keyword the fd_sets must not overlap;
* readfds, writefds shall not point to the same fd_set structure
* in memory.
*
* The select() function returns the number of ready sockets that are
* contained in the descriptor sets, or RTCS_ERROR if an error occurred
* (RTCS_errno is set appropriately).If the time limit expires, select() returns 0.
*
* Any of readfds, writefds may be given as null pointers if
* no descriptors are of interest.
*
* select() function modifies the content of readfds/writefds.
*
* SPECIAL NOTES:
* datagram socket in writefds is reported as always writeable.
*
*END*-----------------------------------------------------------------*/
