使用popen时必须关闭流

我不确定的原因是因为每次我在使用popen打开的流上调用pclose时,我得到一个-1返回代码.

如果我之后打电话给perror,我收到以下消息.

pclose: No Child Processes

我在下面使用的代码基本上是运行一个命令并捕获它的输出.我从最后一行得到错误(返回pclose(fileListingStream);)

int executeCommand(char *command) {
    //The Stream to read that will contain the output of the command
    FILE *fileListingStream;
    char path[PATH_MAX];

    //Run the commmand in read mode
    fileListingStream = popen(command,"r");

    //Ensure that its not null before continuing
    if (fileListingStream == NULL)
        return EXIT_FAILURE;

    //Get the data from the stream and then print to the the console
    while (fgets(path,PATH_MAX,fileListingStream) != NULL)
        printf("%s",path);

    //Close the stream and return its return code
    return pclose(fileListingStream);
}