--- /dev/null
+/* 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 <sysdep.h>
+#include <sys/syscall.h>
+
+#include "kernel-features.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. */
+#include <kernel_sigaction.h>
+
+#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;
+
+extern int __syscall_sigaction (int, const struct old_kernel_sigaction *__unbounded,
+ struct old_kernel_sigaction *__unbounded);
+#endif
+extern int __syscall_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
+__libc_sigaction (sig, act, oact)
+ int sig;
+ const struct sigaction *act;
+ struct sigaction *oact;
+{
+#if __ASSUME_REALTIME_SIGNALS == 0
+ struct old_kernel_sigaction k_sigact, k_osigact;
+#endif
+ int result;
+
+#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
+ 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 = INLINE_SYSCALL (rt_sigaction, 4, sig,
+ act ? __ptrvalue (&kact) : NULL,
+ oact ? __ptrvalue (&koact) : NULL,
+ sizeof (kernel_sigset_t));
+
+# 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 __ASSUME_REALTIME_SIGNALS == 0
+ __set_errno (saved_errno);
+ __libc_missing_rt_sigs = 1;
+# endif
+ }
+#endif
+
+#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
+ k_sigact.sa_restorer = act->sa_restorer;
+# endif
+ }
+ 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
+ oact->sa_restorer = k_osigact.sa_restorer;
+# endif
+ }
+ return result;
+#endif
+}
+
+weak_alias (__libc_sigaction, __sigaction)
+weak_alias (__libc_sigaction, sigaction)
projects / platform / upstream / glibc.git / commitdiff