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Full Discussion: How to send data to previous program (pipe)?
Top Forums Shell Programming and Scripting How to send data to previous program (pipe)? Post 303014595 by Don Cragun on Thursday 15th of March 2018 09:11:54 AM
Old 03-15-2018
Quote:
Originally Posted by JackK
Both examples given by Don Cragun and Corona688 are working for me and I understand the idea behind it.
However, both those examples rely on a possibility of creating cmd1 and cmd2 from scratch, so that stdin/stdout redirection (Corona688's example) and testing file existence (Don Cragun's example) can be made.
This is, however, not possible when I have sqlplus instead of cmd1. Am I right? If yes, then my problem is still unsolved.
You have said that in your case, cmd1 is an interactive sqlplus script that you control. You can make that sqlplus script recognize that something in its environment has changed and use recognition of that change to do whatever it is that you want to do. If, on the other hand, your cmd1 is not an interactive sqlplus script or if you can't make that script recognize that something has changed in the outside world and make adjustments based on that change, then you can't do what you say you want to do and there is nothing we can do to help you make that happen (other than things we have already suggested that you have said you don't want to use).
 

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LEARN ABOUT SUSE

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)
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