SIGSEGV分段错误

Question

我正在学习使用Linux中的套接字设置客户端服务器通信的教程。我在strftime（）调用中观察SIGSEGV分段错误。我试过调试值，不知道故障在哪里。有人可以帮忙吗？

    int socketOk;
    int fds[2];
    pid_t child_proc;

    socketOk = socketpair(AF_LOCAL, SOCK_STREAM, 0, fds);

    if((child_proc = fork()) == (pid_t) -1) {
        //Fork Failure case
        printf("\n ERR-%s: fork() failed \n", strerror(errno));
    }


    else if(child_proc == 0) {
        //Fork Child case

        printf("\n Child: Child process created under Server PID - %d \n", getppid());

        close(fds[0]);
        fds[0] = -1;

        printf("\n Child: Requesting Date in a specific format from Server");
        char *timeFormatPtrChild;
        //timeFormatPtrChild = "%Y-%m-%d %I:%M:%S";
        timeFormatPtrChild = "%A %d-%b-%Y %l:%M %p";
        int writeOk = write(fds[1], timeFormatPtrChild, strlen(timeFormatPtrChild));
        printf("\n Child: Request sent to Server - %s \n", (writeOk==-1 ? "Unsuccessful" : "Successful"));

        char timeStringChild[50];
        int readOk = read(fds[1], timeStringChild, sizeof timeStringChild);
        timeStringChild[readOk] = 0;
        if(readOk >= 0) {
            printf("\n Child: Date received from server - %s \n", timeStringChild);
        }
        else {
            printf("\n ERR-%s: read() failed in client \n", strerror(errno));
        }

        fflush(stdout);

        close(fds[0]);

    }
    else {
        //Fork Parent case

        close(fds[1]);
        fds[1]=-1;

        printf("\n Server: Child process created with PID-%d \n", child_proc);

        printf("\n Server: Waiting for Child request");
        char timeString[80];
        char timeFormatPtr[50];
        int readOk = read(fds[0], timeFormatPtr, sizeof timeFormatPtr);
        printf("\n Server: Received Time format from Child - %s \n", (readOk==-1 ? "Unsuccessful" : timeFormatPtr));
        timeFormatPtr[readOk] = 0;

        time_t timePtr;
        time(&timePtr);
        strftime(timeString, sizeof timeString, timeFormatPtr, localtime(&timePtr));


        int writeOk = write(fds[0], timeString, strlen(timeString));
        if(writeOk >= 0) {
            printf("\n Server: Date sent to Child - %s \n", timeString);
        }
        else {
            printf("\n ERR-%s: write() failed in Server \n", strerror(errno));
        }

        int status;
        close(fds[0]);

        waitpid(child_proc, &status, 0);

    }

    return 0;
}