{
    "q1": {
        "type": "blank", 
        "question": "\n<p>On a typical Unix system, we are presented with two key storage\nabstractions.  The first is the <b>(1)</b> ____, which is just a linear\narray of bytes that you can <b>(2)</b> ____ or <b>(3)</b> ____. Associated\nwith each of these is an <b>(4)</b> ____ number, which is its low-level\nname.</p>\n\n<p>The second abstraction is the <b>(5)</b> ____, which is a list of pairs\ncontaining the user-readable name of the data, and its assocated low-level\nidentifier.</p>\n"
    }, 
    "q3": {
        "type": "blank", 
        "question": "\n<p>Identify the key <b>system call</b> you should use to implement the\nfollowing Unix command-line utility:</p>\n\n<p>\n<ol>\n  <li><tt>mkdir</tt>: <b>____</b></li>\n  <li><tt>rmdir</tt>: <b>____</b></li>\n  <li><tt>stat</tt>: <b>____</b></li>\n  <li><tt>chmod</tt>: <b>____</b></li>\n  <li><tt>kill</tt>: <b>____</b></li>\n\n  <li><tt>cd</tt>: <b>____</b></li>\n  <li><tt>mv</tt>: <b>____</b></li>\n  <li><tt>rm</tt>: <b>____</b></li>\n  <li><tt>ln</tt>: <b>____</b></li>\n  <li><tt>touch</tt>: <b>____</b></li>\n</ol>\n</p>\n"
    }, 
    "q2": {
        "type": "order", 
        "question": "\n<p>Identify the <b>system call</b> you should use to accomplish the\nfollowing tasks:</p>\n\n<p>\n<ol>\n  <li>Create a file.</li>\n  <li>Load the contents of a file into memory.</li>\n  <li>Store data in memory to a file.</li>\n  <li>Move to a particular offset within a file.</li>\n  <li>Flush data in memory to disk.</li>\n</ol>\n</p>\n", 
        "responses": {
            "read": "read", 
            "write": "write", 
            "open": "open", 
            "fsync": "fsync", 
            "lseek": "lseek"
        }
    }, 
    "q4": {
        "type": "blank", 
        "question": "\n<p>Fill in the blanks for the following program: <a href=\"https://gitlab.com/nd-cse-20289-sp19/cse-20289-sp19-assignments/raw/master/reading10/walk.c\">walk.c</a><p>\n\n<pre>\n/* walk.c */\n\n#include <errno.h>\n#include <stdio.h>\n#include <stdlib.h>\n#include <string.h>\n\n#include <sys/stat.h>\n#include <dirent.h>\n#include <unistd.h>\n\nint main(int argc, char *argv[]) {\n    /* Open directory handle */\n    DIR *d = ____(\".\");                                                     /* 1 */\n    if (!d) {\n        fprintf(stderr, \"%s\\n\", ____(errno));                               /* 2 */\n        return EXIT_FAILURE;\n    }\n\n    /* For each directory entry, check if it is a file, and print out the its\n     * name and file size */\n    for (struct dirent *e = ____(d); e; e = ____(d)) {                      /* 3 & 4 */\n        /* Skip current directory and parent directory */\n        if (strcmp(____, \".\") == 0 || strcmp(____, \"..\") == 0) {            /* 5 & 6 */\n            continue;\n        }\n\n        /* Skip non-regular files */\n        if (____ != DT_REG) {                                               /* 7 */\n            continue;\n        }\n\n        /* Get file meta-data */\n        struct stat s;\n        if (____(____, &s) < 0) {                                           /* 8 & 9 */\n            fprintf(stderr, \"%s\\n\", ____(errno));                           /* 10 */\n            continue;\n        }\n\n        /* Display file name and size */\n        printf(\"%s %lu\\n\", ____, ____);                                     /* 11 & 12 */\n    }\n\n    /* Close directory handle */\n    ____(d);                                                                /* 13 */\n    return EXIT_SUCCESS;\n}\n</pre>\n\n<p>Note, that this program performs the equivalent of the following Python code:</p>\n\n<pre>\nimport os\n\nfor name in os.listdir('.'):\n    if os.path.isfile(name):\n        print(name, os.path.getsize(name))\n</pre>\n\n<p>Your program should display something like this:</p>\n\n<pre>\nwalk.c 1161\nwalk 22896\nMakefile 565\nREADME.md 22\nwalk.py 136\n</pre>\n"
    }
}