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CentOS 7.0 - man page for ffsll (centos section 3)

FFS(3)					      Linux Programmer's Manual 				       FFS(3)

NAME
ffs, ffsl, ffsll - find first bit set in a word
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 significant) 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 functions 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)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
GNU
2010-09-20 FFS(3)


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