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Top Forums Shell Programming and Scripting Pass return value of a function in background process Post 302966646 by ashima jain on Monday 15th of February 2016 04:07:39 AM
Old 02-15-2016
Quote:
Originally Posted by RudiC
You can't pass variables back to the calling process. You can intercept the output and assing it to a variable.

What sense does it make to run a process in background and then wait for its status (and/or output)?

Its because the function f2 is function I have used to display status of the operations going on in function f1.
Can you explain "You can intercept the output and assing it to a variable."
How can we do the above?
 

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EXIT(2) 							System Calls Manual							   EXIT(2)

NAME
exit, _exit - terminate a process SYNOPSIS
void _exit(int status) DESCRIPTION
_exit terminates a process with the following consequences: All of the descriptors open in the calling process are closed. This may entail delays, for example, waiting for output to drain; a process in this state may not be killed, as it is already dying. If the parent process of the calling process is executing a wait or is interested in the SIGCHLD signal (Minix-vmd), then it is notified of the calling process's termination and the low-order eight bits of status are made available to it; see wait(2). The parent process ID of all of the calling process's existing child processes are also set to 1. This means that the initializa- tion process (see intro(2)) inherits each of these processes as well. Most C programs call the library routine exit(3), which performs cleanup actions in the standard I/O library before calling _exit. RETURN VALUE
This call never returns. SEE ALSO
fork(2), sigaction(2), wait(2), exit(3). 4th Berkeley Distribution May 22, 1986 EXIT(2)
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