proc_shellcmd.c 文件参考

浏览源代码.

函数
int	OsShellCmdWriteProc (int argc, char **argv)
	SHELLCMD_ENTRY (writeproc_shellcmd, CMD_TYPE_EX, "writeproc", XARGS,(CmdCallBackFunc) OsShellCmdWriteProc)

函数说明

OsShellCmdWriteProc()

int OsShellCmdWriteProc	(	int	argc,
		char **	argv
	)

proc/uptime

在文件 proc_shellcmd.c 第 82 行定义.

{
    int i;
    int ret;
    const char *path = NULL;
    const char *value = NULL;
    unsigned int len;
    struct ProcDirEntry *handle = NULL;
    char realPath[PATH_MAX] = {'\0'};
    const char *rootProcDir = "/proc/";
 
    if (argc == WRITEPROC_ARGC) {//argv[0] = ">>"
        value = argv[0];//test
        path = argv[2];///proc/uptime
        len = strlen(value) + 1;  /* +1:add the \0 */
        if (strncmp(argv[1], ">>", strlen(">>")) == 0) { //  第二个参数必须得是 >>
            if ((realpath(path, realPath) == NULL) || (strncmp(realPath, rootProcDir, strlen(rootProcDir)) != 0)) {
                PRINT_ERR("No such file or directory\n");
                return PROC_ERROR;
            }
 
            handle = OpenProcFile(realPath, O_TRUNC);//打开 proc 文件
            if (handle == NULL) {
                PRINT_ERR("No such file or directory\n");
                return PROC_ERROR;
            }
 
            ret = WriteProcFile(handle, value, len);
            if (ret < 0) {
                (void)CloseProcFile(handle);
                PRINT_ERR("write error\n");
                return PROC_ERROR;
            }
            for (i = 0; i < argc; i++) {
                PRINTK("%s%s", i > 0 ? " " : "", argv[i]);
            }
            PRINTK("\n");
            (void)CloseProcFile(handle);
            return LOS_OK;
        }
    }
    PRINT_ERR("writeproc [data] [>>] [path]\n");
    return PROC_ERROR;
}

函数调用图:

SHELLCMD_ENTRY()

SHELLCMD_ENTRY	(	writeproc_shellcmd	,
		CMD_TYPE_EX	,
		"writeproc"	,
		XARGS	,
		(CmdCallBackFunc)	OsShellCmdWriteProc
	)