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Man Pages
SIGNBIT(3) FreeBSD Library Functions Manual SIGNBIT(3)

signbit
determine whether a floating-point number's sign is negative

Math Library (libm, -lm)

#include <math.h>

int
signbit(real-floating x);

The signbit() macro takes an argument of x and returns non-zero if the value of its sign is negative, otherwise 0.

fpclassify(3), math(3)

The signbit() macro conforms to ISO/IEC 9899:1999 (“ISO C99”).

The signbit() macro was added in FreeBSD 5.1.
July 18, 2004 FreeBSD 13.1-RELEASE

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