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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 stan- dards as follows: getdtablesize(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. DESCRIPTION The getdtablesize() function returns the total number of file descrip- tors in a process' descriptor table. Each process has a fixed size de- scriptor table that is guaranteed to have at least 64 slots. The en- tries in the descriptor table are numbered with small integers starting at 0 (zero). The getdtablesize() function returns the total number of file descrip- tors that a process can have open simultaneously. Each process is lim- ited 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)