Date: Sun, 8 Jul 2001 13:00:14 +0200 From: Gabriel Ambuehl <gabriel_ambuehl@buz.ch> To: freebsd-questions@freebsd.org Subject: Passing data in C++ via stdin without waiting for the new process to complete Message-ID: <114577608557.20010708130014@buz.ch>
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Hello,
I wonder how I could efficiently achieve to pass data via stdin to a
new process spawned by the current one without having the parent
process waiting for the child to complete. I just want to spawn the
child, pass the data to it and then forget about it, no matter how
long it takes for the child to complete.
popen() doesn't appear to be a suitable tool for this kind of work as
the manpage says:
The pclose() function waits for the associated process to
terminate and
returns the exit status of the command as returned by wait4().
which means that the parent is blocked til the client finishes.
system("echo data | some_app");
does work, but the parent process still is blocked till the child
finishes and I don't think it's the most efficient of all ideas to
first spawn a shell (although popen() appears to be doing this as
well), then spawn an instance of echo just to get the data where it
should be and then spawn the third process to do the actual work.
Any comments would greatly be appreciated.
TIA & best regards,
Gabriel
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