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    The following form allows you to view linux man pages.

    Command:

    ffsll

    
    
    

    SYNOPSIS

           #include <strings.h>
    
           int ffs(int i);
    
           #include <string.h>
    
           int ffsl(long int i);
    
           int ffsll(long long int i);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           ffs():
               Since glibc 2.12:
                   _SVID_SOURCE || _BSD_SOURCE || _POSIX_C_SOURCE >= 200809L ||
                   _XOPEN_SOURCE >= 700 ||
               Before glibc 2.12:
                   none
           ffsl(), ffsll():
               _GNU_SOURCE
    
    
    

    DESCRIPTION

           The ffs() function returns the position of the  first  (least  signifi-
           cant)  bit  set in the word i.  The least significant bit is position 1
           and the most significant position is, for example, 32 or 64.  The func-
           tions  ffsll()  and  ffsl()  do the same but take arguments of possibly
           different size.
    
    
    

    RETURN VALUE

           These functions return the position of the first bit set, or  0  if  no
           bits are set in i.
    
    
    

    CONFORMING TO

           ffs(): 4.3BSD, POSIX.1-2001.
    
           The ffsl() and ffsll() functions are glibc extensions.
    
    
    

    NOTES

           BSD systems have a prototype in <string.h>.
    
    
    

    SEE ALSO

           memchr(3)
    
    
    

    GNU 2010-09-20 FFS(3)

    
    
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