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glibc/sysdeps
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Joseph Myers 7553131847 Fix struct sigaltstack namespace (bug 21517). 
glibc defines the stack_t type with the tag struct sigaltstack.  This
is not permitted by POSIX; sigaltstack is only reserved with file
scope in the namespace of ordinary identifiers, not the tag namespace,
and in the case where stack_t is obtained from ucontext.h rather than
signal.h, it's not reserved with file scope at all.

This patch removes the tag accordingly and updates uses in glibc of
struct sigaltstack.  This is similar to the removal of the "struct
siginfo" tag a few years ago: C++ name mangling changes are an
unavoidable consequence.  A NEWS item is added to note the changed
mangling.  There is inevitably some risk of breaking builds of
anything that relies on the struct sigaltstack name (though the first
few hits I looked at from codesearch.debian.net generally seemed to
involve code that could use the stack_t name conditionally, so
depending on how they determine the conditionals they may work with
glibc not defining the struct tag anyway).

Tested for x86_64 and x86, and with build-many-glibcs.py.

	[BZ #21517]
	* bits/types/stack_t.h (stack_t): Remove struct tag.
	* sysdeps/unix/sysv/linux/bits/types/stack_t.h (stack_t):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/types/stack_t.h (stack_t):
	Likewise.
	* debug/segfault.c (install_handler): Use stack_t instead of
	struct sigaltstack.
	* hurd/hurd/signal.h (struct hurd_sigstate): Likewise.
	* hurd/trampoline.c (_hurd_setup_sighandler): Likewise.
	* include/signal.h (__sigaltstack): Likwise.
	* signal/sigaltstack.c (__sigaltstack): Likewise.
	* signal/signal.h (sigaltstack): Likewise.
	* sysdeps/mach/hurd/i386/signal-defines.sym
	(SIGALTSTACK__SS_SP__OFFSET): Likewise.
	(SIGALTSTACK__SS_SIZE__OFFSET): Likewise.
	(SIGALTSTACK__SS_FLAGS__OFFSET): Likewise.
	* sysdeps/mach/hurd/sigaltstack.c (__sigaltstack): Likewise.
	* sysdeps/mach/hurd/sigstack.c (sigstack): Likewise.
	* sysdeps/unix/sysv/linux/alpha/sys/procfs.h (struct
	elf_prstatus): Likewise.
	* sysdeps/unix/sysv/linux/hppa/____longjmp_chk.c (CHECK_SP):
	Likewise.
	* sysdeps/unix/sysv/linux/ia64/sys/procfs.h (struct elf_prstatus):
	Likewise.
	* sysdeps/unix/sysv/linux/m68k/____longjmp_chk.c (CHECK_SP):
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/sys/procfs.h (struct
	elf_prstatus): Likewise.
	* sysdeps/unix/sysv/linux/sh/sys/procfs.h (struct elf_prstatus):
	Likewise.
	* sysdeps/unix/sysv/linux/sys/procfs.h (struct elf_prstatus):
	Likewise.
2017-06-05 10:17:46 +00:00
..
aarch64 aarch64: Thunderx specific memcpy and memmove 2017-05-24 16:46:48 -07:00
alpha Move shared pthread definitions to common headers 2017-05-09 17:49:17 -03:00
arm Fix more namespace issues in sys/ucontext.h (bug 21457). 2017-06-01 14:07:40 +00:00
generic Fix sys/ucontext.h namespace from signal.h etc. inclusion (bug 21457). 2017-05-23 11:49:48 +00:00
gnu Regenerate sysdeps/gnu/errlist.c. 2017-06-04 15:27:14 -04:00
hppa Remove wrong definitions from pthread header refactor 2017-05-11 10:46:03 -03:00
i386 Fix more namespace issues in sys/ucontext.h (bug 21457). 2017-06-01 14:07:40 +00:00
ia64 Suppress internal declarations for most of the testsuite. 2017-05-11 19:27:59 -04:00
ieee754 float128: Add wrappers to override ldbl-128 as float128. 2017-05-25 09:01:37 -03:00
init_array Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
m68k Fix more namespace issues in sys/ucontext.h (bug 21457). 2017-06-01 14:07:40 +00:00
mach Fix struct sigaltstack namespace (bug 21517). 2017-06-05 10:17:46 +00:00
microblaze Move shared pthread definitions to common headers 2017-05-09 17:49:17 -03:00
mips Fix more namespace issues in sys/ucontext.h (bug 21457). 2017-06-01 14:07:40 +00:00
nios2 Move shared pthread definitions to common headers 2017-05-09 17:49:17 -03:00
nptl fork: Remove bogus parent PID assertions [BZ #21386] 2017-05-12 16:04:16 +02:00
posix getaddrinfo: Eliminate another strdup call 2017-06-03 08:37:31 +02:00
powerpc Remove __need macros from signal.h. 2017-05-20 19:04:43 -04:00
pthread Remove __need macros from signal.h. 2017-05-20 19:04:43 -04:00
s390 Move shared pthread definitions to common headers 2017-05-09 17:49:17 -03:00
sh Move shared pthread definitions to common headers 2017-05-09 17:49:17 -03:00
sparc Remove useless comment from sysdeps/sparc/sparc32/dl-machine.h 2017-05-23 01:10:29 +05:30
tile Move shared pthread definitions to common headers 2017-05-09 17:49:17 -03:00
unix Fix struct sigaltstack namespace (bug 21517). 2017-06-05 10:17:46 +00:00
wordsize-32 Build divdi3 only for architecture that required it 2017-04-06 15:14:34 -03:00
wordsize-64 Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
x86 x86: Update __x86_shared_non_temporal_threshold 2017-06-02 17:32:37 -07:00
x86_64 x86_64: Remove redundant REX bytes from memchr.S 2017-05-30 12:39:14 -07:00