尝试附加到文件C时权限被拒绝

Question

我正在尝试打开文件并使用C附加到它们。我根据进程ID动态命名目录，并根据循环中随机选择的“房间”创建文件名。我的目的是打开文件，将房间名称附加到文件中，然后关闭文件并移动到下一个房间并执行相同的功能。我遇到的问题是“开放”。它似乎只返回-1，表示错误。错误消息表明“权限被拒绝”。我对此感到困惑，因为我似乎在open函数中设置了适当的权限。我尝试使用fopen（），但是一直产生分段错误11.我的roomFilePath声明和用法是否存在问题，或者我的使用是不正确的？以下是包含该问题的代码部分。 makeRooms（）函数是我检查文件是否正确打开的地方。谢谢！

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

#define NUM_ROOMS 10
#define NUM_USED_ROOMS 7
#define MAX_CONNECTIONS 6

time_t t;
char* usedRooms[NUM_USED_ROOMS];
int i;
char directoryName[100];
char* baseDirectory = "walterer.rooms.";
int processId;
char roomFilePath[75];
int adjacencyMatrix[7][7] = {0};
int useableConnections;
int e;
int totConnections = 0;
int openRoom;
int file_descriptor;

char* roomNames[] = {

    "cleveland",
    "columbus",
    "dallas",
    "toledo",
    "miami",
    "sarasota",
    "boston",
    "chicago",
    "denver",
    "phoenix"


};

int connections[10] = {
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0
};


void makeDirectory() {

    processId = getpid();
    sprintf(directoryName, "%s%d", baseDirectory,processId);
    //printf("%s\n", directoryName);
    mkdir(directoryName, 777);

}

void makeRooms() {

    /* Initializes random number generator */
    srand((unsigned) time(&t));

    /* Create 7 rooms */
    for(i = 0; i < NUM_USED_ROOMS; ){

        /* Generate random number between 0 to 10 */
        int randomNumber = rand() % NUM_ROOMS;

        /* Loop as long the array does not contain any connections at the index */
        while(connections[randomNumber] == 0) {

            /* Append the room path to the end of my ONID path */
            sprintf(roomFilePath,"%s/%s", directoryName, roomNames[randomNumber]);
            printf("%s\n",roomFilePath);

            /* Create file */
            FILE *filePointer;

            /* Open file to append*/
            //filePointer = open(roomFilePath, O_WRONLY | O_CREAT, 0600);


            //!!!Returning -1
            file_descriptor = open(roomFilePath, O_APPEND, 0600);
            printf("%d\n",file_descriptor);
            if (file_descriptor == -1)
            {
                printf("open() failed on \"%s\"\n", roomFilePath);
                perror("In createRooms()");
                exit(1);
            }


            /*if (filePointer == NULL)      
            {
                fprintf(stderr, "Error Creating File\n");
                printf("something went wrong with read()! %s\n", strerror(errno));
            }*/
            /* Print the room name in the file */
            /* SEG FAULT HERE!!!! */
            fprintf(filePointer, "ROOM NAME: %s\n", roomNames[randomNumber]);

            /* Close the file */
            //fclose(filePointer);
            usedRooms[i] = roomNames[randomNumber];
            connections[randomNumber] = 1;

            //printf("Room %d is %s \n", i+1, roomNames[randomNumber]);
            i++;
        }

    }

}