02-07-2018
Examples you provided cannot be used for inter process communication.
Only way i can think now are shell coprocesses, with using shell only as a programming tool.
As other mentioned, other languages/tools offer easier way to achieve your goal using various techniques which are not that 'transparent' to use in shell language or are great overhead to code.
You should think about switching to database side completely (stored procedures, pl/sql) to get the desired processing with minimal code investment and (probably) best performance.
But this is just a wild guess, since the whole processes is not known to me.
Rewrite and remodel is sometimes best way to fix your program when features required just cannot keep up.
Hope that helps
Regards
Peasant.
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usb_control_msg
USB_CONTROL_MSG(9) USB Core APIs USB_CONTROL_MSG(9)
NAME
usb_control_msg - Builds a control urb, sends it off and waits for completion
SYNOPSIS
int usb_control_msg(struct usb_device * dev, unsigned int pipe, __u8 request, __u8 requesttype, __u16 value, __u16 index, void * data,
__u16 size, int timeout);
ARGUMENTS
dev
pointer to the usb device to send the message to
pipe
endpoint "pipe" to send the message to
request
USB message request value
requesttype
USB message request type value
value
USB message value
index
USB message index value
data
pointer to the data to send
size
length in bytes of the data to send
timeout
time in msecs to wait for the message to complete before timing out (if 0 the wait is forever)
CONTEXT
!in_interrupt ()
DESCRIPTION
This function sends a simple control message to a specified endpoint and waits for the message to complete, or timeout.
If successful, it returns the number of bytes transferred, otherwise a negative error number.
Don't use this function from within an interrupt context, like a bottom half handler. If you need an asynchronous message, or need to send
a message from within interrupt context, use usb_submit_urb. If a thread in your driver uses this call, make sure your disconnect method
can wait for it to complete. Since you don't have a handle on the URB used, you can't cancel the request.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 USB_CONTROL_MSG(9)