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In the C programming language, variables are scoped to the code block in which they are declared and are only valid within that code block.
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getdtablesize(2) [bsd man page]

GETDTABLESIZE(2)						System Calls Manual						  GETDTABLESIZE(2)

NAME
getdtablesize - get descriptor table size SYNOPSIS
nfds = getdtablesize() int nfds; 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 call getdtablesize returns the size of this table. SEE ALSO
close(2), dup(2), open(2), select(2) 4.2 Berkeley Distribution June 28, 1985 GETDTABLESIZE(2)

Check Out this Related Man Page

GETDTABLESIZE(3)					     Linux Programmer's Manual						  GETDTABLESIZE(3)

NAME
getdtablesize - get descriptor table size SYNOPSIS
#include <unistd.h> int getdtablesize(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): getdtablesize(): Since glibc 2.12: _BSD_SOURCE || !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) Before glibc 2.12: _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED DESCRIPTION
getdtablesize() returns the maximum number of files a process can have open, one more than the largest possible value for a file descrip- tor. RETURN VALUE
The current limit on the number of open files per process. ERRORS
On Linux, getdtablesize() can return any of the errors described for getrlimit(2); see NOTES below. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------------+---------------+---------+ |Interface | Attribute | Value | +----------------+---------------+---------+ |getdtablesize() | Thread safety | MT-Safe | +----------------+---------------+---------+ CONFORMING TO
SVr4, 4.4BSD (the 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
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. SEE ALSO
close(2), dup(2), getrlimit(2), open(2) Linux 2015-03-02 GETDTABLESIZE(3)

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