libs/libc/unistd/lib_getrusage.c: Add a dummy getrusage() implementation.

libs/libc/unistd/Make.defs

@@ -40,6 +40,7 @@ CSRCS += lib_getopt.c lib_getoptargp.c lib_getoptindp.c lib_getoptoptp.c
 CSRCS += lib_alarm.c lib_sleep.c lib_usleep.c
 CSRCS += lib_seteuid.c lib_setegid.c lib_geteuid.c lib_getegid.c
 CSRCS += lib_setreuid.c lib_setregid.c
+CSRCS += lib_getrusage.c
 
 ifneq ($(CONFIG_SCHED_USER_IDENTITY),y)
 CSRCS += lib_setuid.c lib_setgid.c lib_getuid.c lib_getgid.c

libs/libc/unistd/lib_getrusage.c

@@ -0,0 +1,78 @@
+/****************************************************************************
+ * libs/libc/unistd/lib_getrusage.c
+ *
+ *   Copyright (C) 2019 Xiaomi Inc. All rights reserved.
+ *   Author:  Xiang Xiao <xiaoxiang@xiaomi.com>
+ *
+ * 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 <string.h>
+#include <errno.h>
+
+#include <sys/resource.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getrusage
+ *
+ * Description:
+ *   The getrusage() function shall provide measures of the resources used
+ *   by the current process or its terminated and waited-for child processes.
+ *   If the value of the who argument is RUSAGE_SELF, information shall be
+ *   returned about resources used by the current process. If the value of
+ *   the who argument is RUSAGE_CHILDREN, information shall be returned
+ *   about resources used by the terminated and waited-for children of the
+ *   current process. If the child is never waited for (for example, if the
+ *   parent has SA_NOCLDWAIT set or sets SIGCHLD to SIG_IGN), the resource
+ *   information for the child process is discarded and not included in the
+ *   resource information provided by getrusage().
+ *
+ ****************************************************************************/
+
+int getrusage(int who, FAR struct rusage *r_usage)
+{
+  if (r_usage == NULL)
+    {
+      set_errno(EINVAL);
+      return ERROR;
+    }
+
+  memset(r_usage, 0, sizeof(*r_usage));
+  return OK;
+}