1 files changed, 137 insertions, 0 deletions
diff --git a/nuttx/sched/env_unsetenv.c b/nuttx/sched/env_unsetenv.c
new file mode 100644
index 000000000..8002cfdbb
--- /dev/null
+++ b/nuttx/sched/env_unsetenv.c
@@ -0,0 +1,137 @@
+/****************************************************************************
+ * env_unsetenv.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 Gregory Nutt 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>
+
+#ifndef CONFIG_DISABLE_ENVIRON
+
+#include <sched.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "os_internal.h"
+#include "env_internal.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function:  unsetenv
+ *
+ * Description:
+ *   The unsetenv() function deletes the variable name from the environment.
+ *
+ * Parameters:
+ *   name - The name of the variable to delete
+ *
+ * Return Value:
+ *   Zero on success
+ *
+ * Assumptions:
+ *   Not called from an interrupt handler
+ *
+ ****************************************************************************/
+
+int unsetenv(const char *name)
+{
+  FAR _TCB      *rtcb;
+  FAR environ_t *envp;
+  FAR char      *pvar;
+  int ret = OK;
+
+  /* Verify input parameter */
+
+  if (!name)
+    {
+      ret = EINVAL;
+      goto errout;
+    }
+
+  /* Get a reference to the thread-private environ in the TCB.*/
+
+  sched_lock();
+  rtcb = (FAR _TCB*)g_readytorun.head;
+  envp = rtcb->envp;
+
+  /* Check if the variable exists */
+
+  if ( envp && (pvar = env_findvar(envp, name)) != NULL)
+    {
+      int        alloc;
+      environ_t *tmp;
+
+      /* It does!  Remove the name=value pair from the environment. */
+
+      (void)env_removevar(envp, pvar);
+
+      /* Reallocate the new environment buffer */
+
+      alloc = envp->ev_alloc;
+      tmp   = (environ_t*)realloc(envp, SIZEOF_ENVIRON_T(alloc));
+      if (!tmp)
+        {
+          ret = ENOMEM;
+          goto errout_with_lock;
+        }
+
+      /* Save the new environment pointer (it might have changed due to reallocation. */
+
+      rtcb->envp = tmp;
+    }
+
+  sched_unlock();
+  return OK;
+
+errout_with_lock:
+  sched_unlock();
+errout:
+  *get_errno_ptr() = ret;
+  return ERROR;
+}
+
+#endif /* CONFIG_DISABLE_ENVIRON */
+
+
+