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getdtablesize(2) [osf1 man page]

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)

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getdtablesize(3C)					   Standard C Library Functions 					 getdtablesize(3C)

NAME
getdtablesize - get the file descriptor table size SYNOPSIS
#include <unistd.h> int getdtablesize(void); DESCRIPTION
The getdtablesize() function is equivalent to getrlimit(2) with the RLIMIT_NOFILE option. RETURN VALUES
The getdtablesize() function returns the current soft limit as if obtained from a call to getrlimit() with the RLIMIT_NOFILE option. ERRORS
No errors are defined. USAGE
There is no direct relationship between the value returned by getdtablesize() and OPEN_MAX defined in <limits.h>. Each process has a file 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() function returns the current maximum size of this table by calling the getrlimit() function. SEE ALSO
close(2), getrlimit(2), open(2), setrlimit(2), select(3C) SunOS 5.11 1 Mar 1996 getdtablesize(3C)

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