NAME
getdtablesize
—
get descriptor table size
LIBRARY
library “libc”
SYNOPSIS
#include
<unistd.h>
int
getdtablesize
(void);
DESCRIPTION
Thegetdtablesize
function is an equivalent of
sysconf
()
with _SC_OPEN_MAX
.
SEE ALSO
close(2), dup(2), getrlimit(2), open(2), select(2), sysconf(3)
HISTORY
The getdtablesize
() function call appeared
in 4.2BSD.
Historically, each process had 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 call
getdtablesize
() used to return the size of this
table. It doesn't make much sense these days because the size of the table
is dynamic.