getdtablesize(2) System Calls Manual getdtablesize(2)
NAME
getdtablesize - Gets the descriptor table size
SYNOPSIS
#include <unistd.h>
int getdtablesize ( void );
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
getdtablesize(): XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
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 start-
ing 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.
RELATED INFORMATION
Functions: close(2), open(2), select(2)
Standards: standards(5) delim off
getdtablesize(2)
