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Old 06-05-2013, 05:57 PM   #1
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Registered: Jun 2013
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Calling popen from a daemon.

I have a process where I call daemon(int nochdir, int noclose), specifying true for nochdir and false for noclose. I then wish to call popen to have a command do work for me and then send its stdout back to my process. This works fine if daemon() is not called first.

My understanding was that daemon() will redirect stdout, stdin and stderr to /dev/null but that popen should still be able to do its thing and redirect the stdout of the command I specify in the popen call to the pipe file descriptor returned from the popen call. Why doesn't this still work even if my process is running as a daemon?
Old 06-10-2013, 12:59 AM   #2
Registered: Nov 2004
Location: Russia (St.Petersburg)
Distribution: Debian
Posts: 666

Rep: Reputation: 68
it does work fine:

$ rm -f /tmp/result ; ./a.out ; sleep .5 ; cat /tmp/result 
result: 0


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