c - 如何使用 C (linux) 中的管道将 GCC 的输出保存在文件中？

Question

在执行时，文件创建工作正常......但没有任何内容被写入其中......可以做什么......除了使用文件描述符之外还有其他方法吗......？？

我尝试了以下代码:

    memset(buffer, '\0', sizeof(buffer));
    read_fp = popen("gcc test1.c", "r");
    //fp = fopen("/home/pranav/Desktop/b4.txt","w");
    fd = open("beejoutput2.txt", O_CREAT | O_RDWR, S_IRUSR | S_IWUSR | S_IRGRP  |         S_IROTH);
    if (read_fp != NULL)
    {

        chars_read = fread(buffer, sizeof(char), BUFSIZ, read_fp);
        while (chars_read > 0)
        {

    /*writing to the file*/
        while ((bytesread = read(3, buffer, chars_read)) > 0) 
                write(fd, buffer, bytesread);

        buffer[chars_read-1] = '\0';
        printf("Reading %d:-\n %s\n", BUFSIZ, buffer);
        //fprintf(fp,"%d:-\n %s\n", BUFSIZ, buffer);
        chars_read = fread(buffer, sizeof(char), BUFSIZ, read_fp);
        }



    pclose(read_fp);
    exit(EXIT_SUCCESS);
    }
    //fclose(fp);
    exit(EXIT_FAILURE);
    return 0;
    }

Answer 1

错误信息会出现在 stderr 上，所以改变这个

read_fp = popen("gcc test1.c", "r");

对此

read_fp = popen("gcc test1.c 2>&1", "r");