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man page for getdtablesize

GETDTABLESIZE(2)					     Linux Programmer's Manual						  GETDTABLESIZE(2)

getdtablesize - get descriptor table size SYNOPSIS
#include <unistd.h> int getdtablesize(void); DESCRIPTION
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. NOTES
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). CONFORMING TO
SVr4, 4.4BSD (the getdtablesize function first appeared in BSD 4.2). SEE ALSO
close(2), dup(2), getrlimit(2), open(2) Linux 2.4 2002-04-15 GETDTABLESIZE(2)

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