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getdtablesize(2)
NAME
  getdtablesize - Get the size of the descriptor table

SYNOPSIS
  #include <unistd.h>

  int getdtablesize(
	  void );

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  getdtablesize(): XSH4.2, XSH5.0

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

DESCRIPTION
  The getdtablesize() function returns the maximum 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. See the descriptions of the open_max_hard and open_max_soft
  attributes in sys_attrs_proc(5) for information about changing the per-
  process limit on open file descriptors.

RETURN VALUES
  The getdtablesize() function returns the size of the descriptor table, and
  is always successful.

SEE ALSO
  Functions: close(2), getrlimit(2), open(2), select(2)

  Standards: standards(5)

Index for Section 2

Alphabetical listing for G

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