Double forloop?


 
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Old 01-21-2015
Quote:
Originally Posted by sea
lol.. and thank you.
For fun i ran lsof on the pid of xorg - because i though bash would be too boring, but now figured i used a /usr/lib64/libdrm_radeon.so.1.0.1 while having a nvidia gpu.
It probably needed that library to check if it's a radeon.
Quote:
Anyway, it sounds like the numbers of FD could be 'infite' (as in: integer max), but on the other hand, in the use(d range) example here, its always FD numbers less or equal than the available VT's.
VT as in virtual terminal? Not really, that's unrelated, the descriptor numbers are anonymous and independent. Descriptor 0 in your program is not the same as descriptor 0 in another program, and descriptor 0 could mean anything or nothing -- a terminal, a file, a device, a FIFO, a UNIX domain socket, etc, etc, or might not even be open. When a program open()'s something, it's assigned the next available number, but after that a program can use dup2() to re-number it into whatever it pleases. This is what the shell does when you open a file into descriptor 5.

This is how input redirection works, by the way -- arrange for descriptors 0 / 1 / 2 to point somewhere before creating the new process.

Quote:
So my question is, what is the max number of adress-able file descriptors?
Code:
$ cat /proc/sys/fs/file-max
295049

$

This is only a theoretical max. This is often limited to something saner per-user in the same way memory and processes are.

Last edited by Corona688; 01-21-2015 at 01:33 PM..
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