--- /dev/null
+/* Copyright (C) 1997, 1998, 1999 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>
+
+/* 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>
+
+extern int __syscall_sigaction (int, const struct old_kernel_sigaction *,
+ struct old_kernel_sigaction *);
+extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
+ struct kernel_sigaction *, size_t);
+
+/* The variable is shared between all wrappers around signal handling
+ functions which have RT equivalents. */
+int __libc_missing_rt_sigs;
+
+#define SA_RESTORER 0x04000000
+
+/* When RT signals are in use we need to use a different return stub. */
+#ifdef __NR_rt_sigreturn
+#define choose_restorer(flags) \
+ (flags & SA_SIGINFO) ? &&__default_rt_sa_restorer \
+ : &&__default_sa_restorer
+#else
+#define choose_restorer(flags) \
+ &&__default_sa_restorer
+#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
+__sigaction (sig, act, oact)
+ int sig;
+ const struct sigaction *act;
+ struct sigaction *oact;
+{
+ struct old_kernel_sigaction k_sigact, k_osigact;
+ int result;
+
+#ifdef __NR_rt_sigaction
+ /* First try the RT signals. */
+ if (!__libc_missing_rt_sigs)
+ {
+ struct kernel_sigaction kact, koact;
+ int saved_errno = errno;
+
+ 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
+ /* If the user specified SA_ONSTACK this means she is trying to
+ use the old-style stack switching. Unfortunately this
+ requires the sa_restorer field so we cannot install our own
+ handler. (In fact the user is likely to be out of luck anyway
+ since the kernel currently only supports stack switching via
+ the X/Open sigaltstack interface, but we allow for the
+ possibility that this might change in the future.) */
+ if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK))
+ kact.sa_restorer = act->sa_restorer;
+ else
+ {
+ kact.sa_restorer = choose_restorer (kact.sa_flags);
+ kact.sa_flags |= 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 ? &kact : NULL,
+ oact ? &koact : NULL, _NSIG / 8);
+
+ if (result >= 0 || errno != ENOSYS)
+ {
+ 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;
+ }
+
+ __set_errno (saved_errno);
+ __libc_missing_rt_sigs = 1;
+ }
+#endif
+
+ 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
+ /* See the comments above for why we test SA_ONSTACK. */
+ if (k_sigact.sa_flags & (SA_RESTORER | SA_ONSTACK))
+ k_sigact.sa_restorer = act->sa_restorer;
+ else
+ {
+ k_sigact.sa_restorer = choose_restorer (k_sigact.sa_flags);
+ k_sigact.sa_flags |= SA_RESTORER;
+ }
+#endif
+ }
+ result = INLINE_SYSCALL (sigaction, 3, sig, act ? &k_sigact : NULL,
+ oact ? &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;
+
+ /* If no SA_RESTORER function was specified by the application we use
+ this one. This avoids the need for the kernel to synthesise a return
+ instruction on the stack, which would involve expensive cache flushes. */
+ __default_sa_restorer:
+ asm volatile ("swi %0" : : "i" (__NR_sigreturn));
+
+#ifdef __NR_rt_sigreturn
+ __default_rt_sa_restorer:
+ asm volatile ("swi %0" : : "i" (__NR_rt_sigreturn));
+#endif
+
+ /* NOTREACHED */
+ return -1;
+}
+
+weak_alias (__sigaction, sigaction)
--- /dev/null
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Philip Blundell <philb@gnu.org>
+
+ 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 <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+#define _SIGNAL_H
+#include <bits/signum.h>
+
+#define CLONE_VM 0x00000100 /* Set if VM shared between processes. */
+#define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to
+ wake it up on mm_release. */
+
+/* Clone the calling process, but without copying the whole address space.
+ The calling process is suspended until the new process exits or is
+ replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
+ and the process ID of the new process to the old process. */
+
+ENTRY (__vfork)
+ mov a1, $SIGCLD
+ orr a1, a1, $(CLONE_VM | CLONE_VFORK)
+ mov a2, $0
+ swi SYS_ify(clone)
+ cmn a1, $4096
+ bhs PLTJMP(C_SYMBOL_NAME(__syscall_error))
+ RETINSTR(mov, pc, lr)
+
+PSEUDO_END (__vfork)
+
+weak_alias (__vfork, vfork)
projects / platform / upstream / glibc.git / commitdiff