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Re: how do I check that an FD is open?
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From: |
Jim Meyering |
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Subject: |
Re: how do I check that an FD is open? |
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Date: |
Sun, 14 Dec 2008 21:46:21 +0100 |
Sam Steingold <address@hidden> wrote:
> How do I figure out if the fd (specifically, stdin=0) is open?
> apparently it is closed when the application is run by nohup.
> the only thing I could figure out so far is fstat: when 0 is open,
> st_mode is 8592, when it is closed it is 8630...
Hi Sam,
This is very lightweight, and does this job. The test,
fcntl (fd, F_GETFD) < 0
indicates that fd is not open.