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FFS(9) | Basic C Library Functions | FFS(9) |
NAME¶
ffs - find first set bit in word
SYNOPSIS¶
int ffs(int x);
ARGUMENTS¶
int x
the word to search
DESCRIPTION¶
This is defined the same way as the libc and compiler builtin ffs routines, therefore differs in spirit from the other bitops.
ffs(value) returns 0 if value is 0 or the position of the first set bit if value is nonzero. The first (least significant) bit is at position 1.
COPYRIGHT¶
June 2017 | Kernel Hackers Manual 4.11 |