GETDTABLESIZE(3) BSD Programmer's Manual GETDTABLESIZE(3)
getdtablesize - get descriptor table size
#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 call getdtablesize() returns the size of this table.
close(2), dup(2), getrlimit(2), open(2), select(2), setrlimit(2), sysconf(3), sysctl(3)
The getdtablesize() function call appeared in 4.2BSD. MirOS BSD #10-current March 10, 1991 1
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