NAME
getdtablesize - get descriptor table size
SYNOPSIS
#include <unistd.h>
int getdtablesize(void);
DESCRIPTION
R getdtablesize ()
returns the maximum number of files a process can have open,
one more than the largest possible value for a file descriptor.
RETURN VALUE
The current limit on the number of open files per process.
ERRORS
On Linux,
R getdtablesize ()
can return any of the errors described for
getrlimit(2);
see NOTES below.
CONFORMING TO
SVr4, 4.4BSD (the
R getdtablesize ()
function first appeared in 4.2BSD).
It is not specified in POSIX.1-2001;
portable applications should employ
sysconf(_SC_OPEN_MAX)
instead of this call.
NOTES
R getdtablesize ()
is implemented as a libc library function.
The glibc version calls
getrlimit(2)
and returns the current
RLIMIT_NOFILE
limit, or
OPEN_MAX
when that fails.
The libc4 and libc5 versions return
OPEN_MAX
(set to 256 since Linux 0.98.4).
SEE ALSO
