105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
/****************************************************************************
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* apps/system/system/system.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <sched.h>
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#include <assert.h>
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#include "nshlib/nshlib.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: system
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*
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* Description:
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* Use system to pass a command string to the NSH parser and wait for it
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* to finish executing.
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*
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* This is an experimental version with known incompatibilies:
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*
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* 1. It is not a part of libc due to its close association with NSH. The
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* function is still prototyped in nuttx/include/stdlib.h, however.
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* 2. It cannot use /bin/sh since that program will not exist in most
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* embedded configurations. Rather, it will spawn a shell-specific
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* system command -- currenly only NSH.
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* 3. REVISIT: There may be some issues with returned values.
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* 4. Of course, only NSH commands will be supported so that still means
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* that many leveraged system() calls will still not be functional.
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*
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****************************************************************************/
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int system(FAR char *cmd)
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{
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FAR char *nshargv[2];
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int pid;
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int rc;
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int ret;
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DEBUGASSERT(cmd != NULL);
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/* Spawn nsh_system() which will execute the command under the shell */
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nshargv[0] = cmd;
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nshargv[1] = NULL;
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pid = task_create("system", CONFIG_SYSTEM_SYSTEM_PRIORITY,
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CONFIG_SYSTEM_SYSTEM_STACKSIZE, nsh_system,
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(FAR char * const *)nshargv);
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if (pid < 0)
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{
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return EXIT_FAILURE;
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}
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/* Wait for the shell to return */
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ret = waitpid(pid, &rc, 0);
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if (ret < 0)
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{
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return EXIT_FAILURE;
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}
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return rc;
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}
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