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openharmony_ci
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#### js_sys_module
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#### 一、process introduce
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It is mainly to obtain the relevant ID of the process, obtain and modify the working directory of the process, and exit and close the process. Process module, involving fourteen interfaces.
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1.getUid() :number;
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The process. Getuid () method returns the digital user ID of the process.
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2.getGid() :number;
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The process. Getgid () method returns the numeric group ID of the process.
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3.getEUid() :number;
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The process. Geteuid () method returns the digitally valid user identity of the process.
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4.getEGid() :number;
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The process. Getegid () method returns the numeric valid group ID of the node. JS process.
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5.getGroups() :number[];
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The process. Getgroups () method returns an array with supplementary group ID.
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6.getPid() :number;
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The process.pid property returns the PID of the process.
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7.getPpid() :number;
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The process.ppid property returns the PID of the parent process of the current process.
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8.chdir(dir:string) :void;
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The process. Chdir () method changes the current working directory of the node. JS process.
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9.uptime() :number;
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The process. Uptime () method returns the number of seconds that the current system has been running.
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10.Kill(pid:number, signal:number) :boolean;
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The process. Kill () method will send a signal to the process PID identified by.
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11.abort() :void;
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The process. Abort () method causes the node. JS process to exit immediately and generate a core file.
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12.on(type:string ,listener:EventListener) :void;
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The process. On () method is used to store events triggered by the user.
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13.exit(code:number):void;
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The process. Exit () method will cause the node. JS process to exit immediately.
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14.cwd():string;
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The process. Cwd () method returns the current working directory of the node. JS process.
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15.off(type:string) :boolean;
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The process. off () Clear user-stored function events.
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#### process usage method
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import { Process } from '@ohos.process' export default { data: { title: "" },
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getGid() {
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var proc = new Process();
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var result = proc.getGid;
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console.log("-------"+result);
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},
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getUid() {
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var proc = new Process();
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var res = proc.getUid;
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console.log("-------"+res);
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},
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getEgid() {
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var proc = new Process();
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var resb = proc.getEgid;
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console.log("-------"+resb);
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},
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getEuid() {
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var proc = new Process();
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var ans = proc.getEuid;
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console.log("-------"+ans);
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},
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getGroups() {
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var proc = new Process();
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var answer = proc.getGroups;
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console.log("-------"+answer);
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},
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uptime() {
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var proc = new Process();
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var num = proc.uptime();
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console.log("---------"+num);
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},
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kill() {
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var proc = new Process();
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var ansu = proc.kill(5,23);
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console.log("------"+ansu);
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},
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chdir() {
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var proc = new Process();
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proc.chdir("123456");
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},
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getPid() {
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var pro = new Process();
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var result = pro.getPid;
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console.log("-----"+result);
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},
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getPpid(){
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var pro = new Process();
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var result = pro.getPpid;
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console.log("---------"+result);
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},
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on(){
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function add(num){
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var value = num + 5;
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return value;
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}
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var proc = new Process();
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proc.on("add",add);
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},
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off(){
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var pro = new Process();
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var result = pro.off("add");
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console.log("---------"+result);
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},
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Cwd(){
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var pro = new Process();
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var result = pro.cwd();
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console.log("----"+result);
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},
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exit(){
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var pro = new Process();
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pro.exit(15);
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},
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abort(){
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var pro = new Process();
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pro.abort();
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},
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onInit() {
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this.title = "strings.world";
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}
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}
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#### 二、childprocess introduction
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The childprocess object can be used to create a new process. The main process can obtain the standard input and output of the child process,
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send signals and close the child process.
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Interface introduction
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1.runCmd(command : string, options?: RunOptions): ChildProcess
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Runcmd can fork a new process to run a shell and return the childprocess object.
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The first parameter command refers to the shell to be run, and the second parameter options refers to some running parameters of the child
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process.These parameters mainly refer to timeout, killsignal and maxbuffer.
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If timeout is set, the child process will send a signal killsignal after timeout is exceeded. Maxbuffer is used to limit the maximum stdout and
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stderr sizes that can be received.
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2.wait()： Promise
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The wait function is used to wait for the child process to run and return the promise object, whose value is the exit code of the child process.
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3.getOutput(): Promise
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The getoutput function is used to get the standard output of the child process.
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4.getErrorOutput(): Promise
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The geterroroutput function is used to obtain the standard error output of the child process.
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5.close(): void
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The close function is used to close the running child process.
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6.kill(signo: number): void
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The kill function is used to send signals to child processes.
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7.readonly killed: boolean
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Killed indicates whether the signal is sent successfully.
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8.readonly exitCode: number
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Exitcode indicates the exit code of the child process.
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9.pid和ppid
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Represents the child process ID and the main process ID respectively.
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#### usage method
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Take the LS command as an example
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var child = childprocess.runCmd("ls", {maxBuffer:9999,killSignal:15} );
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var stdoutRes = child.getOutput();
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var stderrRes = child.getErrorOutput();
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var status = child.wait();
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stdoutRes.then(val=>{
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console.log("stdout = :" + val);
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});
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stderrRes.then(val=>{
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console.log("stderr = :" + val);
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});
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status.then(val=>{
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console.log("status = :" + val);
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});
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