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diff --git a/apps/examples/elf/tests/signal/signal.c b/apps/examples/elf/tests/signal/signal.c
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+/****************************************************************************
+ * examples/elf/tests/signal/signal.c
+ *
+ * Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define USEC_PER_MSEC 1000
+#define MSEC_PER_SEC 1000
+#define USEC_PER_SEC (USEC_PER_MSEC * MSEC_PER_SEC)
+#define SHORT_DELAY (USEC_PER_SEC / 3)
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static int sigusr1_rcvd = 0;
+static int sigusr2_rcvd = 0;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sigusr1_sighandler
+ ****************************************************************************/
+
+/* NOTE: it is necessary for functions that are referred to by function pointers
+ * pointer to be declared with global scope (at least for ARM). Otherwise,
+ * a relocation type that is not supported by ELF is generated by GCC.
+ */
+
+void sigusr1_sighandler(int signo)
+{
+ printf("sigusr1_sighandler: Received SIGUSR1, signo=%d\n", signo);
+ sigusr1_rcvd = 1;
+}
+
+/****************************************************************************
+ * Name: sigusr2_sigaction
+ ***************************************************************************/
+
+/* NOTE: it is necessary for functions that are referred to by function pointers
+ * pointer to be declared with global scope (at least for ARM). Otherwise,
+ * a relocation type that is not supported by ELF is generated by GCC.
+ */
+
+#ifdef __USE_POSIX199309
+void sigusr2_sigaction(int signo, siginfo_t *siginfo, void *arg)
+{
+ printf("sigusr2_sigaction: Received SIGUSR2, signo=%d siginfo=%p arg=%p\n",
+ signo, siginfo, arg);
+
+#ifdef HAVE_SIGQUEUE
+ if (siginfo)
+ {
+ printf(" si_signo = %d\n", siginfo->si_signo);
+ printf(" si_errno = %d\n", siginfo->si_errno);
+ printf(" si_code = %d\n", siginfo->si_code);
+ printf(" si_pid = %d\n", siginfo->si_pid);
+ printf(" si_uid = %d\n", siginfo->si_uid);
+ printf(" si_status = %d\n", siginfo->si_status);
+ printf(" si_utime = %ld\n", (long)siginfo->si_utime);
+ printf(" si_stime = %ld\n", (long)siginfo->si_stime);
+ printf(" si_value = %d\n", siginfo->si_value.sival_int);
+ printf(" si_int = %d\n", siginfo->si_int);
+ printf(" si_ptr = %p\n", siginfo->si_ptr);
+ printf(" si_addr = %p\n", siginfo->si_addr);
+ printf(" si_band = %ld\n", siginfo->si_band);
+ printf(" si_fd = %d\n", siginfo->si_fd);
+ }
+#endif
+ sigusr2_rcvd = 1;
+}
+#else
+void sigusr2_sigaction(int signo)
+{
+ printf("sigusr2_sigaction: Received SIGUSR2, signo=%d\n", signo);
+ sigusr2_rcvd = 1;
+}
+
+#endif
+
+/****************************************************************************
+ * Name: sigusr2_sighandler
+ ****************************************************************************/
+
+static void sigusr2_sighandler(int signo)
+{
+ printf("sigusr2_sighandler: Received SIGUSR2, signo=%d\n", signo);
+ sigusr2_rcvd = 1;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: main
+ ****************************************************************************/
+
+int main(int argc, char **argv)
+{
+ struct sigaction act;
+ struct sigaction oact;
+ void (*old_sigusr1_sighandler)(int signo);
+ void (*old_sigusr2_sighandler)(int signo);
+ pid_t mypid = getpid();
+#if defined(__USE_POSIX199309) && defined(HAVE_SIGQUEUE)
+ sigval_t sigval;
+#endif
+ int status;
+
+ printf("Setting up signal handlers from pid=%d\n", mypid);
+
+ /* Set up so that sigusr1_sighandler will respond to SIGUSR1 */
+
+ old_sigusr1_sighandler = signal(SIGUSR1, sigusr1_sighandler);
+ if (old_sigusr1_sighandler == SIG_ERR)
+ {
+ fprintf(stderr, "Failed to install SIGUSR1 handler, errno=%d\n",
+ errno);
+ exit(1);
+ }
+
+ printf("Old SIGUSR1 sighandler at %p\n", old_sigusr1_sighandler);
+ printf("New SIGUSR1 sighandler at %p\n", sigusr1_sighandler);
+
+ /* Set up so that sigusr2_sigaction will respond to SIGUSR2 */
+
+ memset(&act, 0, sizeof(struct sigaction));
+ act.sa_sigaction = sigusr2_sigaction;
+ act.sa_flags = SA_SIGINFO;
+
+ (void)sigemptyset(&act.sa_mask);
+
+ status = sigaction(SIGUSR2, &act, &oact);
+ if (status != 0)
+ {
+ fprintf(stderr, "Failed to install SIGUSR2 handler, errno=%d\n",
+ errno);
+ exit(2);
+ }
+
+ printf("Old SIGUSR2 sighandler at %p\n", oact.sa_handler);
+ printf("New SIGUSR2 sighandler at %p\n", sigusr2_sigaction);
+ printf("Raising SIGUSR1 from pid=%d\n", mypid);
+
+ fflush(stdout); usleep(SHORT_DELAY);
+
+ /* Send SIGUSR1 to ourselves via raise() */
+
+ status = raise(SIGUSR1);
+ if (status != 0)
+ {
+ fprintf(stderr, "Failed to raise SIGUSR1, errno=%d\n", errno);
+ exit(3);
+ }
+
+ usleep(SHORT_DELAY);
+ printf("SIGUSR1 raised from pid=%d\n", mypid);
+
+ /* Verify that we received SIGUSR1 */
+
+ if (sigusr1_rcvd == 0)
+ {
+ fprintf(stderr, "SIGUSR1 not received\n");
+ exit(4);
+ }
+ sigusr1_rcvd = 0;
+
+ /* Send SIGUSR2 to ourselves */
+
+ printf("Killing SIGUSR2 from pid=%d\n", mypid);
+ fflush(stdout); usleep(SHORT_DELAY);
+
+#if defined(__USE_POSIX199309) && defined(HAVE_SIGQUEUE)
+ /* Send SIGUSR2 to ourselves via sigqueue() */
+
+ sigval.sival_int = 87;
+ status = sigqueue(mypid, SIGUSR2, sigval);
+ if (status != 0)
+ {
+ fprintf(stderr, "Failed to queue SIGUSR2, errno=%d\n", errno);
+ exit(5);
+ }
+
+ usleep(SHORT_DELAY);
+ printf("SIGUSR2 queued from pid=%d, sigval=97\n", mypid);
+#else
+ /* Send SIGUSR2 to ourselves via kill() */
+
+ status = kill(mypid, SIGUSR2);
+ if (status != 0)
+ {
+ fprintf(stderr, "Failed to kill SIGUSR2, errno=%d\n", errno);
+ exit(5);
+ }
+
+ usleep(SHORT_DELAY);
+ printf("SIGUSR2 killed from pid=%d\n", mypid);
+#endif
+ /* Verify that SIGUSR2 was received */
+
+ if (sigusr2_rcvd == 0)
+ {
+ fprintf(stderr, "SIGUSR2 not received\n");
+ exit(6);
+ }
+ sigusr2_rcvd = 0;
+
+ /* Remove the sigusr2_sigaction handler and replace the SIGUSR2
+ * handler with sigusr2_sighandler.
+ */
+
+ printf("Resetting SIGUSR2 signal handler from pid=%d\n", mypid);
+
+ old_sigusr2_sighandler = signal(SIGUSR2, sigusr2_sighandler);
+ if (old_sigusr2_sighandler == SIG_ERR)
+ {
+ fprintf(stderr, "Failed to install SIGUSR2 handler, errno=%d\n",
+ errno);
+ exit(7);
+ }
+
+ printf("Old SIGUSR2 sighandler at %p\n", old_sigusr2_sighandler);
+ printf("New SIGUSR2 sighandler at %p\n", sigusr2_sighandler);
+
+ /* Verify that the handler that was removed was sigusr2_sigaction */
+
+ if ((void*)old_sigusr2_sighandler != (void*)sigusr2_sigaction)
+ {
+ fprintf(stderr,
+ "Old SIGUSR2 signhanlder (%p) is not sigusr2_sigation (%p)\n",
+ old_sigusr2_sighandler, sigusr2_sigaction);
+ exit(8);
+ }
+
+ /* Send SIGUSR2 to ourselves via kill() */
+
+ printf("Killing SIGUSR2 from pid=%d\n", mypid);
+ fflush(stdout); usleep(SHORT_DELAY);
+
+ status = kill(mypid, SIGUSR2);
+ if (status != 0)
+ {
+ fprintf(stderr, "Failed to kill SIGUSR2, errno=%d\n", errno);
+ exit(9);
+ }
+
+ usleep(SHORT_DELAY);
+ printf("SIGUSR2 killed from pid=%d\n", mypid);
+
+ /* Verify that SIGUSR2 was received */
+
+ if (sigusr2_rcvd == 0)
+ {
+ fprintf(stderr, "SIGUSR2 not received\n");
+ exit(10);
+ }
+ sigusr2_rcvd = 0;
+
+ return 0;
+}
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