diff options
Diffstat (limited to 'libc/signal/sigaction.c')
| -rw-r--r-- | libc/signal/sigaction.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/libc/signal/sigaction.c b/libc/signal/sigaction.c new file mode 100644 index 000000000..58cf57b75 --- /dev/null +++ b/libc/signal/sigaction.c @@ -0,0 +1,177 @@ +/* Copyright (C) 1997, 1998, 1999, 2000 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <signal.h> +#include <string.h> +#include <sys/syscall.h> + + +/* The difference here is that the sigaction structure used in the + kernel is not the same as we use in the libc. Therefore we must + translate it here. */ +#define HAVE_SA_RESTORER + + +#if defined(__hppa__) +#undef HAVE_SA_RESTORER +/* This is the sigaction struction from the Linux 2.1.20 kernel. */ +/* Blah. This is bogus. We don't ever use it. */ +struct old_kernel_sigaction { + __sighandler_t k_sa_handler; + unsigned long sa_mask; + unsigned long sa_flags; +}; + +/* This is the sigaction structure from the Linux 2.1.68 kernel. */ +struct kernel_sigaction { + __sighandler_t k_sa_handler; + unsigned long sa_flags; + sigset_t sa_mask; +}; +#elif defined(__mips__) +/* This is the sigaction structure from the Linux 2.1.24 kernel. */ +#include <sgidefs.h> +struct old_kernel_sigaction { + unsigned int sa_flags; + __sighandler_t k_sa_handler; + unsigned long sa_mask; + unsigned int __pad0[3]; /* reserved, keep size constant */ + + /* Abi says here follows reserved int[2] */ + void (*sa_restorer)(void); +#if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) + /* For 32 bit code we have to pad struct sigaction to get + * constant size for the ABI */ + int pad1[1]; /* reserved */ +#endif +}; + +#define _KERNEL_NSIG 128 +#define _KERNEL_NSIG_BPW 32 +#define _KERNEL_NSIG_WORDS (_KERNEL_NSIG / _KERNEL_NSIG_BPW) + +typedef struct { + unsigned long sig[_KERNEL_NSIG_WORDS]; +} kernel_sigset_t; + +/* This is the sigaction structure from the Linux 2.1.68 kernel. */ +struct kernel_sigaction { + unsigned int sa_flags; + __sighandler_t k_sa_handler; + kernel_sigset_t sa_mask; + void (*sa_restorer)(void); + int s_resv[1]; /* reserved */ +}; +#else + +#undef HAVE_SA_RESTORER +/* This is the sigaction struction from the Linux 2.1.20 kernel. */ +struct old_kernel_sigaction { + __sighandler_t k_sa_handler; + unsigned long sa_mask; + unsigned int sa_flags; +}; + +/* This is the sigaction structure from the Linux 2.1.68 kernel. */ + +struct kernel_sigaction { + __sighandler_t k_sa_handler; + unsigned int sa_flags; + sigset_t sa_mask; +}; +#endif + + + +#if defined __NR_rt_sigaction + +extern int __rt_sigaction (int, const struct kernel_sigaction *__unbounded, + struct kernel_sigaction *__unbounded, size_t); + +/* If ACT is not NULL, change the action for SIG to *ACT. + If OACT is not NULL, put the old action for SIG in *OACT. */ +int sigaction (int sig, const struct sigaction *act, struct sigaction *oact) +{ + int result; + struct kernel_sigaction kact, koact; + + if (act) { + kact.k_sa_handler = act->sa_handler; + memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t)); + kact.sa_flags = act->sa_flags; +# ifdef HAVE_SA_RESTORER + kact.sa_restorer = act->sa_restorer; +# endif + } + + /* XXX The size argument hopefully will have to be changed to the + real size of the user-level sigset_t. */ + result = __rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL, + oact ? __ptrvalue (&koact) : NULL, _NSIG / 8); + + if (oact && result >= 0) { + oact->sa_handler = koact.k_sa_handler; + memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t)); + oact->sa_flags = koact.sa_flags; +# ifdef HAVE_SA_RESTORER + oact->sa_restorer = koact.sa_restorer; +# endif + } + return result; +} + + + + + +#else + +extern int __sigaction (int, const struct old_kernel_sigaction *__unbounded, + struct old_kernel_sigaction *__unbounded); + +/* If ACT is not NULL, change the action for SIG to *ACT. + If OACT is not NULL, put the old action for SIG in *OACT. */ +int sigaction (int sig, const struct sigaction *act, struct sigaction *oact) +{ + struct old_kernel_sigaction k_sigact, k_osigact; + int result; + + if (act) { + k_sigact.k_sa_handler = act->sa_handler; + k_sigact.sa_mask = act->sa_mask.__val[0]; + k_sigact.sa_flags = act->sa_flags; +# ifdef HAVE_SA_RESTORER + k_sigact.sa_restorer = act->sa_restorer; +# endif + } + result = sigaction(sig, act ? __ptrvalue (&k_sigact) : NULL, + oact ? __ptrvalue (&k_osigact) : NULL); + + if (oact && result >= 0) { + oact->sa_handler = k_osigact.k_sa_handler; + oact->sa_mask.__val[0] = k_osigact.sa_mask; + oact->sa_flags = k_osigact.sa_flags; +# ifdef HAVE_SA_RESTORER + oact->sa_restorer = k_osigact.sa_restorer; +# endif + } + return result; +} + +#endif |