diff options
Diffstat (limited to 'libc/sysdeps/linux/mips/sigaction.c')
| -rw-r--r-- | libc/sysdeps/linux/mips/sigaction.c | 223 |
1 files changed, 141 insertions, 82 deletions
diff --git a/libc/sysdeps/linux/mips/sigaction.c b/libc/sysdeps/linux/mips/sigaction.c index 085e25fe6..bd3382f63 100644 --- a/libc/sysdeps/linux/mips/sigaction.c +++ b/libc/sysdeps/linux/mips/sigaction.c @@ -1,125 +1,184 @@ -/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc. +/* Copyright (C) 1997,1998,1999,2000,2002,2003, 2004 + 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. + 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 - Library General Public License for more details. + Lesser 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. - - Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org> - */ + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; 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 <sysdep.h> #include <sys/syscall.h> -#include <bits/kernel_sigaction.h> - -#define SA_RESTORER 0x04000000 +#include "kernel-features.h" -#if defined __NR_rt_sigaction +/* 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. */ +#include <bits/kernel_sigaction.h> -/* 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 __libc_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; -#ifdef IS_IN_libc - __memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask)); -#else - memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask)); +#ifndef LIBC_SIGACTION +extern __typeof(sigaction) __libc_sigaction; #endif - kact.sa_flags = act->sa_flags; -# ifdef HAVE_SA_RESTORER -# if _MIPS_SIM == _ABIO32 - kact.sa_restorer = act->sa_restorer; -# else - kact.sa_restorer = &restore_rt; -# endif -# endif - } - /* XXX The size argument hopefully will have to be changed to the - real size of the user-level sigset_t. */ - result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL, - oact ? __ptrvalue (&koact) : NULL, _NSIG / 8); - - if (oact && result >= 0) { - oact->sa_handler = koact.k_sa_handler; -#ifdef IS_IN_libc - __memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (oact->sa_mask)); -#else - memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (oact->sa_mask)); +#if __ASSUME_REALTIME_SIGNALS == 0 +/* The variable is shared between all wrappers around signal handling + functions which have RT equivalents. This is the definition. */ +int __libc_missing_rt_sigs; + #endif - oact->sa_flags = koact.sa_flags; -# ifdef HAVE_SA_RESTORER - oact->sa_restorer = koact.sa_restorer; -# endif - } - return result; -} +#if _MIPS_SIM != _ABIO32 -#else -extern void restore (void) asm ("__restore") attribute_hidden; +# ifdef __NR_rt_sigreturn +static void restore_rt (void) asm ("__restore_rt"); +# endif +# ifdef __NR_sigreturn +static void restore (void) asm ("__restore"); +# endif +#endif /* 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 __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact) +int +__libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact) { - int result; - struct old_kernel_sigaction kact, koact; +#if __ASSUME_REALTIME_SIGNALS == 0 + struct old_kernel_sigaction k_sigact, k_osigact; +#endif + int result; - if (act) { - kact.k_sa_handler = act->sa_handler; - kact.sa_mask = act->sa_mask.__val[0]; - kact.sa_flags = act->sa_flags; +#if defined __NR_rt_sigaction || __ASSUME_REALTIME_SIGNALS > 0 + /* First try the RT signals. */ +# if __ASSUME_REALTIME_SIGNALS == 0 + if (!__libc_missing_rt_sigs) +# endif + { + struct kernel_sigaction kact, koact; + /* Save the current error value for later. We need not do this + if we are guaranteed to have realtime signals. */ +# if __ASSUME_REALTIME_SIGNALS == 0 + int saved_errno = errno; +# endif + + if (act) + { + kact.k_sa_handler = act->sa_handler; + memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kernel_sigset_t)); + kact.sa_flags = act->sa_flags; # ifdef HAVE_SA_RESTORER # if _MIPS_SIM == _ABIO32 - kact.sa_restorer = act->sa_restorer; + kact.sa_restorer = act->sa_restorer; # else - kact.sa_restorer = &restore_rt; + kact.sa_restorer = &restore_rt; # endif # endif - } + } + + /* XXX The size argument hopefully will have to be changed to the + real size of the user-level sigset_t. */ + result = INLINE_SYSCALL (rt_sigaction, 4, sig, + act ? __ptrvalue (&kact) : NULL, + oact ? __ptrvalue (&koact) : NULL, + sizeof (kernel_sigset_t)); - result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL, - oact ? __ptrvalue (&koact) : NULL); +# if __ASSUME_REALTIME_SIGNALS == 0 + if (result >= 0 || errno != ENOSYS) +# endif + { + if (oact && result >= 0) + { + oact->sa_handler = koact.k_sa_handler; + memcpy (&oact->sa_mask, &koact.sa_mask, + sizeof (kernel_sigset_t)); + oact->sa_flags = koact.sa_flags; +# ifdef HAVE_SA_RESTORER + oact->sa_restorer = koact.sa_restorer; +# endif + } + return result; + } - if (result < 0) { - __set_errno(-result); - return -1; +# if __ASSUME_REALTIME_SIGNALS == 0 + __set_errno (saved_errno); + __libc_missing_rt_sigs = 1; +# endif } +#endif - if (oact) { - oact->sa_handler = koact.k_sa_handler; - oact->sa_mask.__val[0] = koact.sa_mask; - oact->sa_flags = koact.sa_flags; +#if __ASSUME_REALTIME_SIGNALS == 0 + 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 - oact->sa_restorer = koact.sa_restorer; + k_sigact.sa_restorer = act->sa_restorer; # endif } - return result; -} - + result = INLINE_SYSCALL (sigaction, 3, 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 +# if _MIPS_SIM == _ABIO32 + oact->sa_restorer = k_osigact.sa_restorer; +# else + oact->sa_restorer = &restore; +# endif +# endif + } + return result; #endif +} #ifndef LIBC_SIGACTION -hidden_weak_alias(__libc_sigaction,__sigaction) +libc_hidden_proto(sigaction) weak_alias(__libc_sigaction,sigaction) +libc_hidden_weak(sigaction) +#endif + +/* NOTE: Please think twice before making any changes to the bits of + code below. GDB needs some intimate knowledge about it to + recognize them as signal trampolines, and make backtraces through + signal handlers work right. Important are both the names + (__restore_rt) and the exact instruction sequence. + If you ever feel the need to make any changes, please notify the + appropriate GDB maintainer. */ + +#define RESTORE(name, syscall) RESTORE2 (name, syscall) +#define RESTORE2(name, syscall) \ +asm \ + ( \ + ".align 4\n" \ + "__" #name ":\n" \ + " li $2, " #syscall "\n" \ + " syscall\n" \ + ); + +/* The return code for realtime-signals. */ +#if _MIPS_SIM != _ABIO32 +# ifdef __NR_rt_sigreturn +RESTORE (restore_rt, __NR_rt_sigreturn) +# endif +# ifdef __NR_sigreturn +RESTORE (restore, __NR_sigreturn) +# endif #endif |