| .\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>. |
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| .TH FINITE 3 2016-03-15 "" "Linux Programmer's Manual" |
| .SH NAME |
| finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl \- |
| BSD floating-point classification functions |
| .SH SYNOPSIS |
| .nf |
| .B #include <math.h> |
| .sp |
| .BI "int finite(double " x ); |
| .br |
| .BI "int finitef(float " x ); |
| .br |
| .BI "int finitel(long double " x ); |
| .sp |
| .BI "int isinf(double " x ); |
| .br |
| .BI "int isinff(float " x ); |
| .br |
| .BI "int isinfl(long double " x ); |
| .sp |
| .BI "int isnan(double " x ); |
| .br |
| .BI "int isnanf(float " x ); |
| .br |
| .BI "int isnanl(long double " x ); |
| .fi |
| .sp |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .sp |
| .ad l |
| .BR finite (), |
| .BR finitef (), |
| .BR finitel (): |
| .RS 4 |
| /* Glibc since 2.19: */ _DEFAULT_SOURCE |
| || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE |
| .RE |
| .BR isinf (): |
| .RS 4 |
| _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE |
| || /* Glibc since 2.19: */ _DEFAULT_SOURCE |
| || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE |
| .RE |
| .br |
| .BR isinff (), |
| .BR isinfl (): |
| .RS 4 |
| /* Glibc since 2.19: */ _DEFAULT_SOURCE |
| || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE |
| .RE |
| .BR isnan (): |
| .RS 4 |
| _XOPEN_SOURCE || _ISOC99_SOURCE |
| || /* Glibc since 2.19: */ _DEFAULT_SOURCE |
| || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE |
| .RE |
| .BR isnanf (), |
| .BR isnanl (): |
| .RS 4 |
| _XOPEN_SOURCE\ >=\ 600 |
| || /* Glibc since 2.19: */ _DEFAULT_SOURCE |
| || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE |
| .RE |
| .ad b |
| .SH DESCRIPTION |
| The |
| .BR finite (), |
| .BR finitef (), |
| and |
| .BR finitel () |
| functions return a nonzero value if |
| .I x |
| is neither infinite |
| nor a "not-a-number" (NaN) value, and 0 otherwise. |
| |
| The |
| .BR isnan (), |
| .BR isnanf (), |
| and |
| .BR isnanl () |
| functions return a nonzero value if |
| .I x |
| is a NaN value, |
| and 0 otherwise. |
| |
| The |
| .BR isinf (), |
| .BR isinff (), |
| and |
| .BR isinfl () |
| functions return 1 if |
| .I x |
| is positive infinity, \-1 if |
| .I x |
| is negative infinity, and 0 otherwise. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lbw31 lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR finite (), |
| .BR finitef (), |
| .BR finitel (), |
| .br |
| .BR isinf (), |
| .BR isinff (), |
| .BR isinfl (), |
| .br |
| .BR isnan (), |
| .BR isnanf (), |
| .BR isnanl () |
| T} Thread safety MT-Safe |
| .TE |
| .SH NOTES |
| Note that these functions are obsolete. |
| C99 defines macros |
| .BR isfinite (), |
| .BR isinf (), |
| and |
| .BR isnan () |
| (for all types) replacing them. |
| Further note that the C99 |
| .BR isinf () |
| has weaker guarantees on the return value. |
| See |
| .BR fpclassify (3). |
| .\" |
| .\" finite* not on HP-UX; they exist on Tru64. |
| .\" .SH HISTORY |
| .\" The |
| .\" .BR finite () |
| .\" function occurs in 4.3BSD. |
| .\" see IEEE.3 in the 4.3BSD manual |
| .SH SEE ALSO |
| .BR fpclassify (3) |