| GETDTABLESIZE(3) | Library Functions Manual | GETDTABLESIZE(3) |
getdtablesize —
get descriptor table size
Standard C Library (libc, -lc)
#include
<unistd.h>
int
getdtablesize(void);
The getdtablesize function is an
equivalent of
sysconf()
with _SC_OPEN_MAX.
close(2), dup(2), getrlimit(2), open(2), select(2), sysconf(3)
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.
| January 5, 2012 | NetBSD 11.0 |