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-rw-r--r--libc/sysdeps/linux/common/internal-signals.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/internal-signals.h b/libc/sysdeps/linux/common/internal-signals.h
new file mode 100644
index 000000000..65e8de34b
--- /dev/null
+++ b/libc/sysdeps/linux/common/internal-signals.h
@@ -0,0 +1,79 @@
+/* Copyright (C) 2014-2017 Free Software Foundation, Inc.
+
+ 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 <signal.h>
+
+/* The signal used for asynchronous cancelation. */
+#define SIGCANCEL __SIGRTMIN
+
+/* Signal needed for the kernel-supported POSIX timer implementation.
+ We can reuse the cancellation signal since we can distinguish
+ cancellation from timer expirations. */
+#define SIGTIMER SIGCANCEL
+
+/* Signal used to implement the setuid et.al. functions. */
+#define SIGSETXID (__SIGRTMIN + 1)
+
+/* Return if sig is used internally. */
+static inline int
+__is_internal_signal (int sig)
+{
+ return (sig == SIGCANCEL) || (sig == SIGTIMER) || (sig == SIGSETXID);
+}
+
+/* Remove internal signal from the mask. */
+static inline void
+__clear_internal_signals (sigset_t *set)
+{
+ __sigdelset (set, SIGCANCEL);
+ __sigdelset (set, SIGTIMER);
+ __sigdelset (set, SIGSETXID);
+}
+
+#define SIGALL_SET \
+ ((__sigset_t) { .__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 } })
+
+/* Block all signals, including internal ones. */
+static inline int
+__libc_signal_block_all (sigset_t *set)
+{
+ INTERNAL_SYSCALL_DECL (err);
+ return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET,
+ set, _NSIG / 8);
+}
+
+/* Block all application signals (excluding internal ones). */
+static inline int
+__libc_signal_block_app (sigset_t *set)
+{
+ sigset_t allset = SIGALL_SET;
+ __clear_internal_signals (&allset);
+ INTERNAL_SYSCALL_DECL (err);
+ return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &allset, set,
+ _NSIG / 8);
+}
+
+/* Restore current process signal mask. */
+static inline int
+__libc_signal_restore_set (const sigset_t *set)
+{
+ INTERNAL_SYSCALL_DECL (err);
+ return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, set, NULL,
+ _NSIG / 8);
+}
+
+/* Used to communicate with signal handler. */
+extern struct xid_command *__xidcmd attribute_hidden;