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This is good information, thank you. I did the following test: I closed stdin with "exec 0<&-" (by the way, running simply "0<&-" immediately closed me out of my bash shell). I then ran the above compiled C code, but it consistently returned "3" instead of the now presumably available 0 as a filehandle. Is my test incorrect?

Wheelnut
– Wheelnut

2013-11-12 21:00:03 +00:00
Commented Nov 12, 2013 at 21:00
Each process has its own i/o descriptors. Close the shell's input, it quits. To run the above program with a closed input, run it with e.g. ./fd0 <&-.

jthill
– jthill

2013-11-12 21:12:34 +00:00
Commented Nov 12, 2013 at 21:12

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