svn commit: r249859 - head/lib/libc/sys
Jilles Tjoelker
jilles at FreeBSD.org
Wed Apr 24 21:24:36 UTC 2013
Author: jilles
Date: Wed Apr 24 21:24:35 2013
New Revision: 249859
URL: http://svnweb.freebsd.org/changeset/base/249859
Log:
getdtablesize(2): Describe what this function actually does.
getdtablesize() returns the limit on new file descriptors; this says nothing
about existing descriptors.
MFC after: 1 week
Modified:
head/lib/libc/sys/getdtablesize.2
Modified: head/lib/libc/sys/getdtablesize.2
==============================================================================
--- head/lib/libc/sys/getdtablesize.2 Wed Apr 24 21:21:03 2013 (r249858)
+++ head/lib/libc/sys/getdtablesize.2 Wed Apr 24 21:24:35 2013 (r249859)
@@ -28,12 +28,12 @@
.\" @(#)getdtablesize.2 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
-.Dd June 4, 1993
+.Dd April 24, 2013
.Dt GETDTABLESIZE 2
.Os
.Sh NAME
.Nm getdtablesize
-.Nd get descriptor table size
+.Nd get file descriptor limit
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
@@ -41,18 +41,20 @@
.Ft int
.Fn getdtablesize void
.Sh DESCRIPTION
-Each process has a fixed size 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
.Fn getdtablesize
-system call returns the size of this table.
+system call returns the maximum number of file descriptors
+that the current process may open.
+The maximum file descriptor number that the system may assign
+is the return value minus one.
+Existing file descriptor numbers may be higher
+if the limit was lowered after they were opened.
.Sh SEE ALSO
.Xr close 2 ,
+.Xr closefrom 2 ,
.Xr dup 2 ,
-.Xr open 2 ,
-.Xr select 2
+.Xr getrlimit 2 ,
+.Xr sysconf 2
.Sh HISTORY
The
.Fn getdtablesize
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