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glibc/signal/sigvec.c
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/* ABI compatibility for obsolete sigvec function from 4.2BSD. | |
Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <shlib-compat.h> | |
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_21) | |
# include <signal.h> | |
# include <errno.h> | |
# include <stddef.h> | |
/* These are the struct sigvec and SV_* bit definitions that | |
used to be in <signal.h>. The whole interface now exists | |
solely for ABI compatibility, so it can just be here. */ | |
struct sigvec | |
{ | |
__sighandler_t sv_handler; /* Signal handler. */ | |
int sv_mask; /* Mask of signals to be blocked. */ | |
int sv_flags; /* Flags (see below). */ | |
}; | |
# define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */ | |
# define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */ | |
# define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */ | |
/* Include macros to convert between `sigset_t' and old-style mask. */ | |
# include <sigset-cvt-mask.h> | |
# ifndef SA_RESETHAND | |
/* When sigaction lacks the extension bit for it, | |
we use a wrapper handler to support SV_RESETHAND. */ | |
struct sigvec_wrapper_data | |
{ | |
__sighandler_t sw_handler; | |
unsigned int sw_mask; | |
}; | |
static void sigvec_wrapper_handler (int sig) __THROW; | |
static struct sigvec_wrapper_data sigvec_wrapper_data[NSIG]; | |
# endif | |
/* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member | |
of VEC. The signals in `sv_mask' will be blocked while the handler runs. | |
If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be | |
reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL, | |
it is filled in with the old information for SIG. */ | |
int | |
__sigvec (int sig, | |
const struct sigvec *vec, | |
struct sigvec *ovec) | |
{ | |
struct sigaction old; | |
# ifndef SA_RESETHAND | |
if (vec == NULL || !(vec->sv_flags & SV_RESETHAND)) | |
# endif | |
{ | |
struct sigaction new, *n; | |
if (vec == NULL) | |
n = NULL; | |
else | |
{ | |
__sighandler_t handler; | |
unsigned int mask; | |
unsigned int sv_flags; | |
unsigned int sa_flags; | |
handler = vec->sv_handler; | |
mask = vec->sv_mask; | |
sv_flags = vec->sv_flags; | |
sa_flags = 0; | |
if (sv_flags & SV_ONSTACK) | |
{ | |
# ifdef SA_ONSTACK | |
sa_flags |= SA_ONSTACK; | |
# else | |
__set_errno (ENOSYS); | |
return -1; | |
# endif | |
} | |
# ifdef SA_RESTART | |
if (!(sv_flags & SV_INTERRUPT)) | |
sa_flags |= SA_RESTART; | |
# endif | |
# ifdef SA_RESETHAND | |
if (sv_flags & SV_RESETHAND) | |
sa_flags |= SA_RESETHAND; | |
# endif | |
n = &new; | |
new.sa_handler = handler; | |
if (sigset_set_old_mask (&new.sa_mask, mask) < 0) | |
return -1; | |
new.sa_flags = sa_flags; | |
} | |
if (__sigaction (sig, n, &old) < 0) | |
return -1; | |
} | |
# ifndef SA_RESETHAND | |
else | |
{ | |
__sighandler_t handler; | |
unsigned int mask; | |
struct sigvec_wrapper_data *data; | |
struct sigaction wrapper; | |
handler = vec->sv_handler; | |
mask = (unsigned int)vec->sv_mask; | |
data = &sigvec_wrapper_data[sig]; | |
wrapper.sa_handler = sigvec_wrapper_handler; | |
/* FIXME: should we set wrapper.sa_mask, wrapper.sa_flags?? */ | |
data->sw_handler = handler; | |
data->sw_mask = mask; | |
if (__sigaction (sig, &wrapper, &old) < 0) | |
return -1; | |
} | |
# endif | |
if (ovec != NULL) | |
{ | |
__sighandler_t handler; | |
unsigned int sv_flags; | |
unsigned int sa_flags; | |
unsigned int mask; | |
handler = old.sa_handler; | |
sv_flags = 0; | |
sa_flags = old.sa_flags; | |
# ifndef SA_RESETHAND | |
if (handler == sigvec_wrapper_handler) | |
{ | |
handler = sigvec_wrapper_data[sig].sw_handler; | |
/* should we use data->sw_mask?? */ | |
sv_flags |= SV_RESETHAND; | |
} | |
# else | |
if (sa_flags & SA_RESETHAND) | |
sv_flags |= SV_RESETHAND; | |
# endif | |
mask = sigset_get_old_mask (&old.sa_mask); | |
# ifdef SA_ONSTACK | |
if (sa_flags & SA_ONSTACK) | |
sv_flags |= SV_ONSTACK; | |
# endif | |
# ifdef SA_RESTART | |
if (!(sa_flags & SA_RESTART)) | |
# endif | |
sv_flags |= SV_INTERRUPT; | |
ovec->sv_handler = handler; | |
ovec->sv_mask = (int)mask; | |
ovec->sv_flags = (int)sv_flags; | |
} | |
return 0; | |
} | |
compat_symbol (libc, __sigvec, sigvec, GLIBC_2_0); | |
# ifndef SA_RESETHAND | |
static void | |
sigvec_wrapper_handler (int sig) | |
{ | |
struct sigvec_wrapper_data *data; | |
struct sigaction act; | |
int save; | |
__sighandler_t handler; | |
data = &sigvec_wrapper_data[sig]; | |
act.sa_handler = SIG_DFL; | |
act.sa_flags = 0; | |
sigset_set_old_mask (&act.sa_mask, data->sw_mask); | |
handler = data->sw_handler; | |
save = errno; | |
(void) __sigaction (sig, &act, (struct sigaction *) NULL); | |
__set_errno (save); | |
(*handler) (sig); | |
} | |
# endif /* No SA_RESETHAND. */ | |
#endif /* SHLIB_COMPAT */ |