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getdtablesize(2) [freebsd man page]

GETDTABLESIZE(2)					      BSD System Calls Manual						  GETDTABLESIZE(2)

NAME
getdtablesize -- get file descriptor limit LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int getdtablesize(void); DESCRIPTION
The getdtablesize() system call returns the maximum number of file descriptors that the current process may open. The maximum file descrip- tor number that the system may assign is the return value minus one. Existing file descriptor numbers may be higher if the limit was lowered after they were opened. SEE ALSO
close(2), closefrom(2), dup(2), getrlimit(2), sysconf(2) HISTORY
The getdtablesize() system call appeared in 4.2BSD. BSD
April 24, 2013 BSD

Check Out this Related Man Page

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

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(): _BSD_SOURCE || _XOPEN_SOURCE >= 500 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. 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. The libc4 and libc5 versions return OPEN_MAX (set to 256 since Linux 0.98.4). SEE ALSO
close(2), dup(2), getrlimit(2), open(2) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2007-07-26 GETDTABLESIZE(2)

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