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sigcontext/mcontext cleanup for arch-specific bits

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with these changes, the members/types of mcontext_t and related stuff
should closely match the glibc definitions. unlike glibc, however, the
definitions here avoid using typedefs as much as possible and work
directly with the underlying types, to minimize namespace pollution
from signal.h in the default (_BSD_SOURCE) profile.

this is a first step in improving compatibility with applications
which poke at context/register information -- mainly debuggers, trace
utilities, etc. additional definitions in ucontext.h and other headers
may be needed later.

if feature test macros are used to request a conforming namespace,
mcontext_t is replaced with an opaque structure of the equivalent size
and alignment; conforming programs cannot examine its contents anyway.
This commit is contained in:
Rich Felker
2012-11-23 14:35:25 -05:00
parent ac562aa1ef
commit c72fc23843
5 changed files with 94 additions and 81 deletions
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22
arch/mips/bits/signal.h
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@ -1,6 +1,16 @@
#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
typedef struct sigcontext
{
unsigned sc_regmask, sc_status;
unsigned long long sc_pc, sc_regs[32], sc_fpregs[32];
unsigned sc_ownedfp, sc_fpc_csr, sc_fpc_eir, sc_used_math, sc_dsp;
unsigned long long sc_mdhi, sc_mdlo;
unsigned long sc_hi1, sc_lo1, sc_hi2, sc_lo2, sc_hi3, sc_lo3;
} mcontext_t;
#else
typedef struct {
unsigned __mc1[2];
unsigned long long __mc2[65];
@ -8,6 +18,7 @@ typedef struct {
unsigned long long __mc4[2];
unsigned __mc5[6];
} mcontext_t;
#endif
typedef struct __ucontext {
unsigned long uc_flags;
@ -34,17 +45,6 @@ typedef struct __ucontext {
#define SIG_UNBLOCK 2
#define SIG_SETMASK 3
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
struct sigcontext
{
unsigned sc_regmask, sc_status;
unsigned long long sc_pc, sc_regs[32], sc_fpregs[32];
unsigned sc_ownedfp, sc_fpc_csr, sc_fpc_eir, sc_used_math, sc_dsp;
unsigned long long sc_mdhi, sc_mdlo;
unsigned long sc_hi1, sc_lo1, sc_hi2, sc_lo2, sc_hi3, sc_lo3;
};
#endif
#endif
#define SIGHUP 1