Write to the stdin of a running process (without changing the way of starting the program)

Question

In this post there is described how to start a program and then to send data to the stdin of the program (with FIFOs). But what to do if the program is already running, and I cannot re/start the program?

Operating System? Type of program? – Chris S Jul 26 '12 at 13:17 — Chris S, Jul 26 '12 at 13:17

score -1 · Answer 1 · answered Jul 26 '12 at 14:24

I once wrote a program to do the reverse (monitor output of an already started program). It's not a simple operation; it relies on using ptrace() to attach to the process and intercept system calls. When you detect a read() system call, inject the data.

Write to the stdin of a running process (without changing the way of starting the program)

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