HelenOS sources

isinf              99 uspace/lib/c/include/math.h #define isinf(x)       __builtin_isinf(x)
isinf             121 uspace/lib/c/include/math.h #define isinf(x)       (fpclassify(x) == FP_INFINITE)
isinf              99 uspace/lib/posix/include/libc/math.h #define isinf(x)       __builtin_isinf(x)
isinf             121 uspace/lib/posix/include/libc/math.h #define isinf(x)       (fpclassify(x) == FP_INFINITE)