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getdtablesize — get descriptor table size
Standard C Library (libc, -lc)
#include <unistd.h> int getdtablesize(void);
Each process has a fixed size descriptor table, which is guaranteed to have at least 20 slots. The entries in the descriptor table are numbered with small integers starting at 0. The getdtablesize() system call returns the size of this table.
The getdtablesize() system call appeared in 4.2BSD.