SINH(3P)

✨ PROLOG ✨

ok so bestie, heads up before we dive in: this manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ — like, consult the corresponding Linux manual page for the deets on Linux behavior — or the interface might not even be implemented on Linux at all. 💀 no cap.

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💖 NAME 💖

sinh, sinhf, sinhl — the hyperbolic sine functions, aka the math girlies of POSIX Programmer's Manual (that's the manual we're in, sinh(3P) iykyk) 🦋

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🌸 SYNOPSIS 🌸

#include <math.h>

double sinh(double x);
float sinhf(float x);
long double sinhl(long double x);

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✨ DESCRIPTION ✨

So the functionality on this reference page is aligned with the ISO C standard. If there's any conflict between what's written here and the ISO C standard, that's unintentional, bestie — nobody did it on purpose. This volume of POSIX.1‐2017 defers to the ISO C standard. periodt.

These functions shall compute the hyperbolic sine of their argument x. that's it, that's the whole job 💅

Now, if your application wants to check for error situations, here's the ritual: set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. Then on return, if errno is non-zero, or if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred. 🫶

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🎀 RETURN VALUE 🎀

Upon successful completion, these functions shall return the hyperbolic sine of x. slay.

If the result would cause an overflow, a range error shall occur and ±HUGE_VAL, ±HUGE_VALF, and ±HUGE_VALL (with the same sign as x) shall be returned as appropriate for the type of the function. 🔥

If x is NaN, a NaN shall be returned.

If x is ±0 or ±Inf, x shall be returned.

If x is subnormal, a range error may occur and x should be returned. 🙈

If x is not returned, sinh(), sinhf(), and sinhl() shall return an implementation-defined value no greater in magnitude than DBL_MIN, FLT_MIN, and LDBL_MIN, respectively.

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💅 ERRORS 💅

These functions shall fail if:

• Range Error — The result would cause an overflow.
  • If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception shall be raised.

These functions may fail if:

• Range Error — The value x is subnormal.
  • If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno 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.

The following sections are informative. (aka the chill, non-normative ones 🌈)

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🌈 EXAMPLES 🌈

None.

like. literally none. the void. 🕳️✨

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🧚 APPLICATION USAGE 🧚

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. that's the vibe check. 👑

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💜 RATIONALE 💜

None.

(we love a low-effort queen 🫶)

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🦋 FUTURE DIRECTIONS 🦋

None.

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⭐ SEE ALSO ⭐

• asinh()
• cosh()
• feclearexcept()
• fetestexcept()
• isnan()
• tanh()

Also, the Base Definitions volume of POSIX.1‐2017, Section 4.20, Treatment of Error Conditions for Mathematical Functions, and <math.h>. go read those, bestie, they're the lore 📚

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👑 COPYRIGHT 👑

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

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ok that's the whole thing!! this page came from IEEE/The Open Group, 2017 — that's the source and the date, so you know exactly where this queen came from 🎀💖 and that's sinh(3P) bestie, hyperbolic sine done and dusted, mwah 💅✨