1GETDTABLESIZE(2)           Linux Programmer's Manual          GETDTABLESIZE(2)
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NAME

6       getdtablesize - get descriptor table size
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SYNOPSIS

9       #include <unistd.h>
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11       int getdtablesize(void);
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13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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15       getdtablesize(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
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DESCRIPTION

18       getdtablesize()  returns the maximum number of files a process can have
19       open, one more than the largest possible value for a file descriptor.
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RETURN VALUE

22       The current limit on the number of open files per process.
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ERRORS

25       On Linux, getdtablesize() can return any of the  errors  described  for
26       getrlimit(2); see NOTES below.
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CONFORMING TO

29       SVr4,  4.4BSD  (the getdtablesize() function first appeared in 4.2BSD).
30       It is not  specified  in  POSIX.1-2001;  portable  applications  should
31       employ sysconf(_SC_OPEN_MAX) instead of this call.
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NOTES

34       getdtablesize()  is  implemented as a libc library function.  The glibc
35       version calls getrlimit(2) and returns the current RLIMIT_NOFILE limit,
36       or  OPEN_MAX  when  that  fails.   The  libc4 and libc5 versions return
37       OPEN_MAX (set to 256 since Linux 0.98.4).
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SEE ALSO

40       close(2), dup(2), getrlimit(2), open(2)
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COLOPHON

43       This page is part of release 3.25 of the Linux  man-pages  project.   A
44       description  of  the project, and information about reporting bugs, can
45       be found at http://www.kernel.org/doc/man-pages/.
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49Linux                             2007-07-26                  GETDTABLESIZE(2)
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