ulimit: add ulimit implementation

implement the ulimit() based on getrlimit/setrlimit function.
the ulimit() function is requiredd by vsx testset

Signed-off-by: guoshichao <guoshichao@xiaomi.com>

include/ulimit.h

@@ -0,0 +1,52 @@
+/****************************************************************************
+ * include/ulimit.h
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_ULIMIT_H
+#define __INCLUDE_ULIMIT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/resource.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Get limit on the size of a file, in units of 512 bytes */
+
+#define UL_GETFSIZE 1
+
+/* Set limit on the size of a file */
+
+#define UL_SETFSIZE 2
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+long int ulimit(int cmd, long newlimit);
+
+#endif /* __INCLUDE_ULIMIT_H */

libs/libc/unistd/CMakeLists.txt

@@ -69,7 +69,8 @@ set(SRCS
     lib_getpass.c
     lib_chdir.c
     lib_fchdir.c
-    lib_confstr.c)
+    lib_confstr.c
+    lib_ulimit.c)
 
 if(NOT CONFIG_SCHED_USER_IDENTITY)
   list(

libs/libc/unistd/Make.defs

@@ -33,7 +33,7 @@ CSRCS += lib_futimes.c lib_lutimes.c lib_gethostname.c lib_sethostname.c
 CSRCS += lib_fchownat.c lib_linkat.c lib_readlinkat.c lib_symlinkat.c
 CSRCS += lib_unlinkat.c lib_usleep.c lib_getpgrp.c lib_getpgid.c
 CSRCS += lib_lockf.c lib_flock.c lib_getpass.c
-CSRCS += lib_chdir.c lib_fchdir.c lib_confstr.c
+CSRCS += lib_chdir.c lib_fchdir.c lib_confstr.c lib_ulimit.c
 
 ifneq ($(CONFIG_SCHED_USER_IDENTITY),y)
 CSRCS += lib_setuid.c lib_setgid.c lib_getuid.c lib_getgid.c

libs/libc/unistd/lib_ulimit.c

@@ -0,0 +1,75 @@
+/****************************************************************************
+ * libs/libc/unistd/lib_ulimit.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <ulimit.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ulimit
+ *
+ * Description:
+ *   The ulimit will make calls to getrlimit() and setrlimit() to perform
+ *   get and set resource limits respectively.
+ *
+ * Returned value:
+ *   On success, return a non-negative value.
+ *   On failure, return -1 and set the errno value.
+ *
+ ****************************************************************************/
+
+long ulimit(int cmd, long newlimit)
+{
+  long ret = ERROR;
+
+  switch (cmd)
+    {
+      case UL_GETFSIZE:
+        {
+          struct rlimit rlp;
+          getrlimit(RLIMIT_FSIZE, &rlp);
+          ret = rlp.rlim_cur / 512UL;
+        }
+        break;
+      case UL_SETFSIZE:
+        {
+          struct rlimit rlp;
+          rlp.rlim_cur = newlimit * 512UL;
+          ret = setrlimit(RLIMIT_FSIZE, &rlp);
+        }
+        break;
+      default:
+        set_errno(EINVAL);
+        break;
+    }
+
+  return ret;
+}