C library: Add some new functions defined in POSIX.1-2017: stpncpy(), strsignal(), psignal(), psiginfo().

libs/libc/signal/Make.defs

@@ -38,8 +38,8 @@ ifneq ($(CONFIG_DISABLE_SIGNALS),y)
 # Add the signal C files to the build
 
 CSRCS += sig_addset.c sig_delset.c sig_emptyset.c sig_fillset.c
-CSRCS += sig_hold.c sig_ignore.c sig_ismember.c sig_pause.c sig_raise.c
-CSRCS += sig_relse.c sig_set.c signal.c sigwait.c
+CSRCS += sig_hold.c sig_ignore.c sig_ismember.c sig_pause.c sig_psignal.c
+CSRCS += sig_raise.c sig_relse.c sig_set.c sig_signal.c sig_wait.c
 
 # Add the signal directory to the build
 

libs/libc/signal/sig_psignal.c

@@ -0,0 +1,124 @@
+/****************************************************************************
+ * libs/libc/signal/sig_psignal.c
+ *
+ *   Copyright (C) 2018 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 <nuttx/config.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+/* Uses streams... not available to kernel code */
+
+#ifndef __KERNEL__
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: psignal
+ *
+ * Description:
+ *   The psignal() functions will write a language-dependent message
+ *   associated with a signal number to the standard error stream as
+ *   follows:
+ *
+ *     First, if message is not a null pointer and is not the empty string,
+ *     the string pointed to by the message argument will be written,
+ *     followed by a colon and a space.
+ *
+ *     Then the signal description string associated with signum or with the
+ *     signal indicated by pinfo will be written, followed by a newline.
+ *
+ * Returned Value
+ *  None.  The errno value is never set in this implementation.
+ *
+ ****************************************************************************/
+
+void psignal(int signum, FAR const char *message)
+{
+  /* For now, just a brainless write to stderr (fd == 2).  C buffered I/O is
+   * used!
+   */
+
+  if (message != NULL)
+    {
+      (void)fprintf(stderr, "%s: %s\n", strsignal(signum));
+    }
+  else
+    {
+      (void)fprintf(stderr, "%s\n", strsignal(signum));
+    }
+}
+
+/****************************************************************************
+ * Name: psiginfo
+ *
+ * Description:
+ *   The psiginfo() functions will write a language-dependent message
+ *   associated with a signal number to the standard error stream as
+ *   follows:
+ *
+ *     First, if message is not a null pointer and is not the empty string,
+ *     the string pointed to by the message argument will be written,
+ *     followed by a colon and a space.
+ *
+ *     Then the signal description string associated with signum or with the
+ *     signal indicated by pinfo will be written, followed by a newline.
+ *
+ * Returned Value
+ *  None.  Since no value is returned, an application wishing to check for
+ *  error situations should set errno to 0, then call psiginfo() then check
+ *  errno.
+ *
+ ****************************************************************************/
+
+void psiginfo(FAR const siginfo_t *pinfo, FAR const char *message)
+{
+  if (pinfo == NULL)
+    {
+      set_errno(EINVAL);
+    }
+  else
+    {
+      psignal(pinfo->si_signo, message);
+    }
+}
+
+#endif /* __KERNEL__ */

libs/libc/signal/sig_signal.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libs/libc/signal/signal.c
+ * libs/libc/signal/sig_signal.c
  *
  *   Copyright (C) 2015-2017 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>

libs/libc/signal/sig_wait.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * libs/libc/signal/sigwait.c
+ * libs/libc/signal/sig_wait.c
  *
  *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>