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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "LOG1P" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" log1p 
+.SH NAME
+log1p, log1pf, log1pl \- compute a natural logarithm
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+double log1p(double\fP \fIx\fP\fB);
+.br
+float log1pf(float\fP \fIx\fP\fB);
+.br
+long double log1pl(long double\fP \fIx\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+These functions shall compute log_e(1.0 + \fIx\fP).
+.LP
+An application wishing to check for error situations should set \fIerrno\fP
+to zero and call
+\fIfeclearexcept\fP(FE_ALL_EXCEPT) before calling these functions.
+On return, if \fIerrno\fP is non-zero or
+\fIfetestexcept\fP(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW)
+is non-zero, an error has occurred.
+.SH RETURN VALUE
+.LP
+Upon successful completion, these functions shall return the natural
+logarithm of 1.0 + \fIx\fP.
+.LP
+If \fIx\fP is -1, a pole error shall occur and \fIlog1p\fP(), \fIlog1pf\fP(),
+and \fIlog1pl\fP() shall return -HUGE_VAL,
+-HUGE_VALF, and -HUGE_VALL, respectively.
+.LP
+For finite values of \fIx\fP that are less than -1,   \ or if \fIx\fP
+is -Inf,  a domain error shall occur, and   \ either a NaN (if supported),
+or  \ an implementation-defined value shall be returned.
+.LP
+If
+\fIx\fP is NaN, a NaN shall be returned.
+.LP
+If \fIx\fP is \(+-0, or +Inf, \fIx\fP shall be returned.
+.LP
+If \fIx\fP is subnormal, a range error may occur and \fIx\fP should
+be returned. 
+.SH ERRORS
+.LP
+These functions shall fail if:
+.TP 7
+Domain\ Error
+The finite value of \fIx\fP is less than -1,   \ or \fIx\fP is -Inf.
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [EDOM]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the invalid floating-point exception shall be
+raised.
+.TP 7
+Pole\ Error
+The value of \fIx\fP is -1. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the divide-by-zero floating-point exception shall be
+raised.
+.sp
+.LP
+These functions may fail if:
+.TP 7
+Range\ Error
+The value of \fIx\fP is subnormal. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the underflow floating-point exception shall be
+raised. 
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling
+& MATH_ERREXCEPT) are independent of
+each other, but at least one of them must be non-zero.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfeclearexcept\fP() , \fIfetestexcept\fP() , \fIlog\fP() , the Base
+Definitions volume of IEEE\ Std\ 1003.1-2001, Section 4.18, Treatment
+of Error Conditions for Mathematical Functions, \fI<math.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .