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Fix signal stack namespace (bug 21584).

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In POSIX.1:2008, various signal stack symbols - sigaltstack, SS_*,
SIGSTKSZ, MINSIGSTKSZ - are all XSI-shaded.  glibc wrongly makes them
visible for non-XSI POSIX.  This patch fixes the conditionals, leaving
the symbols available for __USE_MISC as it seems likely some of them
are widely used and should be visible by default.  (Note that stack_t
is *not* XSI-shaded and so the conditionals on that are correctly
unchanged.)

Tested for x86_64.

	[BZ #21584]
	* signal/signal.h: Make includes of <bits/sigstack.h> and
	<bits/ss_flags.h> conditional on [__USE_XOPEN_EXTENDED ||
	__USE_MISC].
	(sigaltstack): Make declaration conditional on
	[__USE_XOPEN_EXTENDED || __USE_MISC].
This commit is contained in:
Joseph Myers 2017-06-19 12:00:13 +00:00
parent a66bc30d6b
commit 21f8859dd0
2 changed files with 13 additions and 4 deletions
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7
ChangeLog
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@ -1,5 +1,12 @@
2017-06-19 Joseph Myers <joseph@codesourcery.com>
[BZ #21584]
* signal/signal.h: Make includes of <bits/sigstack.h> and
<bits/ss_flags.h> conditional on [__USE_XOPEN_EXTENDED ||
__USE_MISC].
(sigaltstack): Make declaration conditional on
[__USE_XOPEN_EXTENDED || __USE_MISC].
[BZ #21575]
* resource/bits/types/struct_rusage.h: New file.
* include/bits/types/struct_rusage.h: Likewise.

10
signal/signal.h
View File

@ -301,20 +301,22 @@ extern int sigreturn (struct sigcontext *__scp) __THROW;
calls be restarted after signal SIG. */
extern int siginterrupt (int __sig, int __interrupt) __THROW;
# include <bits/sigstack.h>
# include <bits/types/stack_t.h>
# include <bits/ss_flags.h>
# if defined __USE_XOPEN || defined __USE_XOPEN2K8
/* This will define `ucontext_t' and `mcontext_t'. */
# include <sys/ucontext.h>
# endif
#endif /* Use POSIX.1-2008 or X/Open Unix. */
#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
# include <bits/sigstack.h>
# include <bits/ss_flags.h>
/* Alternate signal handler stack interface.
This interface should always be preferred over `sigstack'. */
extern int sigaltstack (const stack_t *__restrict __ss,
stack_t *__restrict __oss) __THROW;
#endif /* Use POSIX.1-2008 or X/Open Unix. */
#endif /* __USE_XOPEN_EXTENDED || __USE_MISC */
#if ((defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
|| defined __USE_MISC)