getdtablesize(2) — System Calls
NAME
getdtablesize − Gets the descriptor table size
SYNOPSIS
int getdtablesize ( void );
DESCRIPTION
The getdtablesize() function returns the total number of file descriptors in a process’ descriptor table. Each process has a fixed size descriptor table that is guaranteed to have at least 64 slots. The entries in the descriptor table are numbered with small integers starting at 0 (zero).
The getdtablesize() function returns the total number of file descriptors that a process can have open simultaneously. Each process is limited to a fixed number of open file descriptors. This limit is at least 64. The system defined limit is configurable. If it is greater than 64, the system will allocate more file descriptors for a process up to the defined maximum.
RETURN VALUES
The getdtablesize() function returns the size of the descriptor table, and is always successful.