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ID |
Category |
Severity |
Type |
Date Submitted |
Last Update |
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0001461 |
[1003.1(2016/18)/Issue7+TC2] System Interfaces |
Comment |
Clarification Requested |
2021-03-22 10:40 |
2021-12-13 15:02 |
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Reporter |
geoffclare |
View Status |
public |
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Assigned To |
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Priority |
normal |
Resolution |
Accepted |
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Status |
Applied |
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Name |
Geoff Clare |
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Organization |
The Open Group |
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User Reference |
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Section |
tgamma() |
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Page Number |
2145 |
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Line Number |
68720 |
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Interp Status |
--- |
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Final Accepted Text |
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Summary |
0001461: tgamma() with negative integer argument |
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Description |
The tgamma() FUTURE DIRECTIONS section says:It is possible that the error response for a negative integer argument may be changed to a pole error and a return value of ±Inf.
C17 allows a domain error or a pole error (with implementation-defined return value). However, when IEC 60559 Floating-Point is supported, an "invalid" floating-point exception (i.e. a domain error) and NaN return are required. This has not changed in the Dec 2020 C2x draft. So changing POSIX to require a pole error would introduce a conflict with the C standard.
I would suggest that we just change POSIX to match the C standard, i.e. allow either a domain error or a pole error, when IEC 60559 Floating-Point is not supported.
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Desired Action |
On page 2145 line 68720 section tgamma(), change:If x is a negative integer, a [CX]domain[/CX] error may occur and either a NaN (if supported) or an implementation-defined value shall be returned. to:If x is a negative integer, either a domain error or a pole error may occur and either a NaN (if supported) or +/-Inf (if supported), respectively, or an implementation-defined value shall be returned.
On page 2146 line 68762 section tgamma(), change:Pole Error The value of x is zero. to:Pole Error The value of x is zero or a negative integer.
On page 2146 line 68781 section tgamma(), change:It is possible that the error response for a negative integer argument may be changed to a pole error and a return value of ±Inf. to:None.
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issue8 |
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