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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 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.

RELATED INFORMATION
  Functions: close(2), open(2), select(2)

  Standards: standards(5)

Index for Section 2

Alphabetical listing for G

Top of page