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    Command:

    getdtablesize

    
    
    

    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 descriptor.
    
    
    

    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)
    
    
    

    Linux 2013-02-05 GETDTABLESIZE(3)

    
    
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