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@@ -6711,6 +6745,7 @@ pid_t getpid(void);
void _exit(int status) noreturn_function;
unsigned int sleep(unsigned int seconds);
void usleep(unsigned long usec);
+int pause(void);
int close(int fd);
int dup(int fd);
@@ -8187,6 +8222,7 @@ notify a task when a message is available on a queue.
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OS Interfaces
+ pause
pipe
poll
poll.h
diff --git a/include/unistd.h b/include/unistd.h
index e2ad6ff826..681ce9e632 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -133,6 +133,7 @@ EXTERN pid_t getpid(void);
EXTERN void _exit(int status) noreturn_function;
EXTERN unsigned int sleep(unsigned int seconds);
EXTERN int usleep(useconds_t usec);
+EXTERN int pause(void);
/* File descriptor operations */
diff --git a/sched/Makefile b/sched/Makefile
index 9b15108f4d..82f74fc3c8 100644
--- a/sched/Makefile
+++ b/sched/Makefile
@@ -94,7 +94,7 @@ SIGNAL_SRCS = sig_initialize.c \
sig_findaction.c sig_allocatependingsigaction.c \
sig_releasependingsigaction.c sig_unmaskpendingsignal.c \
sig_removependingsignal.c sig_releasependingsignal.c sig_lowest.c \
- sig_mqnotempty.c sig_cleanup.c sig_received.c sig_deliver.c
+ sig_mqnotempty.c sig_cleanup.c sig_received.c sig_deliver.c pause.c
MQUEUE_SRCS = mq_open.c mq_close.c mq_unlink.c mq_send.c mq_timedsend.c\
mq_sndinternal.c mq_receive.c mq_timedreceive.c mq_rcvinternal.c \
diff --git a/sched/pause.c b/sched/pause.c
new file mode 100644
index 0000000000..fb5542d84d
--- /dev/null
+++ b/sched/pause.c
@@ -0,0 +1,110 @@
+/****************************************************************************
+ * sched/pause.c
+ *
+ * Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt
+ *
+ * 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
+
+#include
+#include
+
+/****************************************************************************
+ * Preprocessor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: pause
+ *
+ * Description:
+ * The pause() function will suspend the calling thread until delivery of a
+ * non-blocked signal.
+ *
+ * Input Parameters:
+ * None
+ *
+ * Returned Value:
+ * Since pause() suspends thread execution indefinitely unless interrupted
+ * a signal, there is no successful completion return value. A value of -1
+ * will always be returned and errno set to indicate the error (EINTR).
+ *
+ * POSIX compatibility:
+ * In the POSIX description of this function is the pause() function will
+ * suspend the calling thread until delivery of a signal whose action is
+ * either to execute a signal-catching function or to terminate the
+ * process. This implementation only waits for any non-blocked signal
+ * to be recieved.
+ *
+ ****************************************************************************/
+
+int pause(void)
+{
+ sigset_t set;
+ struct siginfo value;
+
+ /* Set up for the sleep. Using the empty set means that we are not
+ * waiting for any particualar signal. However, any unmasked signal
+ * can still awaken sigtimedwait().
+ */
+
+ (void)sigemptyset(&set);
+
+ /* sigtwaitinfo() cannot succeed. It should always return error EINTR
+ * meaning that some unblocked signal was caught.
+ */
+
+ return sigwaitinfo(&set, &value);
+}
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