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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DESCRIPTION

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

18       The current limit on the number of open files per process.
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NOTES

21       getdtablesize() is implemented as a libc library  function.  The  glibc
22       version calls getrlimit(2) and returns the current RLIMIT_NOFILE limit,
23       or OPEN_MAX when that fails.   The  libc4  and  libc5  versions  return
24       OPEN_MAX (set to 256 since Linux 0.98.4).
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CONFORMING TO

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

32       close(2), dup(2), getrlimit(2), open(2)
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36Linux 2.4                         2002-04-15                  GETDTABLESIZE(2)