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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-05-16 16:05:35 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-08-08 16:16:43 -0300 |
commit | 9995c839a01cd8db17120cb2c0a80f81d858b179 (patch) | |
tree | 8c6bc8eb00563c9c5876b60cf73816e00a41ca29 /nptl/tst-align3.c | |
parent | f17a42333f2eb0bd7ef5194167dd52f9770a6680 (diff) | |
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manual: Document getcontext uc_stack value on Linux [BZ #759]
As decribed in BZ#759, Linux getcontext implementation on Linux does
differs from other SysV system about the returned uc_stack. This is
true not only for i386, but for all the architecture I could actually
check (aarch64, arm, alpha, hppa, m68k, mips, mips64, mips64n32,
powerpc, powerpc64, powerpc64le, s390x, sh, sparc, sparc64, and x86).
And I think we should not change current behavior for some reasons:
1. POSIX 2008 removed this SySV interface for a good reason and changing
this behavior adds nothing for current portable code. POSIX 2001
specification does states that stack should be saved [1] and current
GLIBC code does in a arch-specific manner (inside the mcontext_t)
which allows the setcontext to work correctly.
2. Changing this behavior would potentially require compat symbols and
I see no gain in adding compat symbols for deprecated interfaces.
3. Also, for comment #2 in BZ#759, it is up to kernel do setup the contents
for ucontext_t and currently it does not provide the stack information
as well. Trying to change it is also another fix that does not worth
the possible gains.
Instead my proposal is to make it clear the current interface may differ
depending of the underlying operational system.
glibc documentation and close this bug as invalid.
[BZ #759]
* manual/setjmp.texi (getcontex): Document uc_stack value on Linux.
[1] http://pubs.opengroup.org/onlinepubs/009695399/functions/getcontext.html
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