diff options
Diffstat (limited to 'signal/sigvec.c')
| -rw-r--r-- | signal/sigvec.c | 186 |
1 files changed, 176 insertions, 10 deletions
diff --git a/signal/sigvec.c b/signal/sigvec.c index e3ffb281a8..d4921536e9 100644 --- a/signal/sigvec.c +++ b/signal/sigvec.c @@ -1,4 +1,5 @@ -/* Copyright (C) 1991-2014 Free Software Foundation, Inc. +/* ABI compatibility for obsolete sigvec function from 4.2BSD. + Copyright (C) 1991-2014 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 @@ -15,8 +16,47 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#include <signal.h> -#include <errno.h> +#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. @@ -24,14 +64,140 @@ 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 (sig, vec, ovec) +__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 (sig) int sig; - const struct sigvec *vec; - struct sigvec *ovec; { - __set_errno (ENOSYS); - return -1; + 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); } -stub_warning (sigvec) +# endif /* No SA_RESETHAND. */ -weak_alias (__sigvec, sigvec) +#endif /* SHLIB_COMPAT */ |