[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/libc/glibc/glibc-2.22/hurd/catch-signal.c b/ap/libc/glibc/glibc-2.22/hurd/catch-signal.c
new file mode 100644
index 0000000..1f10b89
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.22/hurd/catch-signal.c
@@ -0,0 +1,167 @@
+/* Convenience function to catch expected signals during an operation.
+ Copyright (C) 1996-2015 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 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <hurd/signal.h>
+#include <hurd/sigpreempt.h>
+#include <string.h>
+#include <assert.h>
+
+error_t
+hurd_catch_signal (sigset_t sigset,
+ unsigned long int first, unsigned long int last,
+ error_t (*operate) (struct hurd_signal_preemptor *),
+ sighandler_t handler)
+{
+ /* We need to restore the signal mask, because otherwise the
+ signal-handling code will have blocked the caught signal and for
+ instance calling hurd_catch_signal again would then dump core. */
+ sigjmp_buf buf;
+ void throw (int signo, long int sigcode, struct sigcontext *scp)
+ { siglongjmp (buf, scp->sc_error ?: EGRATUITOUS); }
+
+ struct hurd_signal_preemptor preemptor =
+ {
+ sigset, first, last,
+ NULL, handler == SIG_ERR ? (sighandler_t) &throw : handler,
+ };
+
+ struct hurd_sigstate *const ss = _hurd_self_sigstate ();
+ error_t error;
+
+ if (handler != SIG_ERR)
+ /* Not our handler; don't bother saving state. */
+ error = 0;
+ else
+ /* This returns again with nonzero value when we preempt a signal. */
+ error = sigsetjmp (buf, 1);
+
+ if (error == 0)
+ {
+ /* Install a signal preemptor for the thread. */
+ __spin_lock (&ss->lock);
+ preemptor.next = ss->preemptors;
+ ss->preemptors = &preemptor;
+ __spin_unlock (&ss->lock);
+
+ /* Try the operation that might crash. */
+ (*operate) (&preemptor);
+ }
+
+ /* Either FUNCTION completed happily and ERROR is still zero, or it hit
+ an expected signal and `throw' made setjmp return the signal error
+ code in ERROR. Now we can remove the preemptor and return. */
+
+ __spin_lock (&ss->lock);
+ assert (ss->preemptors == &preemptor);
+ ss->preemptors = preemptor.next;
+ __spin_unlock (&ss->lock);
+
+ return error;
+}
+
+
+error_t
+hurd_safe_memset (void *dest, int byte, size_t nbytes)
+{
+ error_t operate (struct hurd_signal_preemptor *preemptor)
+ {
+ memset (dest, byte, nbytes);
+ return 0;
+ }
+ return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
+ (vm_address_t) dest, (vm_address_t) dest + nbytes,
+ &operate, SIG_ERR);
+}
+
+
+error_t
+hurd_safe_copyout (void *dest, const void *src, size_t nbytes)
+{
+ error_t operate (struct hurd_signal_preemptor *preemptor)
+ {
+ memcpy (dest, src, nbytes);
+ return 0;
+ }
+ return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
+ (vm_address_t) dest, (vm_address_t) dest + nbytes,
+ &operate, SIG_ERR);
+}
+
+error_t
+hurd_safe_copyin (void *dest, const void *src, size_t nbytes)
+{
+ error_t operate (struct hurd_signal_preemptor *preemptor)
+ {
+ memcpy (dest, src, nbytes);
+ return 0;
+ }
+ return hurd_catch_signal (sigmask (SIGBUS) | sigmask (SIGSEGV),
+ (vm_address_t) src, (vm_address_t) src + nbytes,
+ &operate, SIG_ERR);
+}
+
+error_t
+hurd_safe_memmove (void *dest, const void *src, size_t nbytes)
+{
+ jmp_buf buf;
+ void throw (int signo, long int sigcode, struct sigcontext *scp)
+ { longjmp (buf, scp->sc_error ?: EGRATUITOUS); }
+
+ struct hurd_signal_preemptor src_preemptor =
+ {
+ sigmask (SIGBUS) | sigmask (SIGSEGV),
+ (vm_address_t) src, (vm_address_t) src + nbytes,
+ NULL, (sighandler_t) &throw,
+ };
+ struct hurd_signal_preemptor dest_preemptor =
+ {
+ sigmask (SIGBUS) | sigmask (SIGSEGV),
+ (vm_address_t) dest, (vm_address_t) dest + nbytes,
+ NULL, (sighandler_t) &throw,
+ &src_preemptor
+ };
+
+ struct hurd_sigstate *const ss = _hurd_self_sigstate ();
+ error_t error;
+
+ /* This returns again with nonzero value when we preempt a signal. */
+ error = setjmp (buf);
+
+ if (error == 0)
+ {
+ /* Install a signal preemptor for the thread. */
+ __spin_lock (&ss->lock);
+ src_preemptor.next = ss->preemptors;
+ ss->preemptors = &dest_preemptor;
+ __spin_unlock (&ss->lock);
+
+ /* Do the copy; it might fault. */
+ memmove (dest, src, nbytes);
+ }
+
+ /* Either memmove completed happily and ERROR is still zero, or it hit
+ an expected signal and `throw' made setjmp return the signal error
+ code in ERROR. Now we can remove the preemptor and return. */
+
+ __spin_lock (&ss->lock);
+ assert (ss->preemptors == &dest_preemptor);
+ ss->preemptors = src_preemptor.next;
+ __spin_unlock (&ss->lock);
+
+ return error;
+}