c - 访问填充有从管道读取的数据的结构时出现段错误

Question

在尝试访问名为 Request 的结构时，我一直遇到段错误，该结构填充了从管道读取的数据。我的代码有什么问题？此处抛出的错误是一个简单的 printf 尝试打印名称字段

结构定义:

typedef struct 
{
    char code;      
    pid_t pid;       
    char *name;      
    char *object;    
    int id;          
    void *buffer;    
    size_t size;     
} Request;

作者代码:

request.code   = MANADDUSER;   /* macro defining a char */
request.pid    = getpid();
request.name   = argument1;   /* dinamycally allocated string */
request.object = NULL;
request.id     = 0;
request.buffer = NULL;
request.size   = 0;
if((fifoto = open(FIFOTOMMBOXD, O_WRONLY)) == -1)   logMmboxman("error in opening FIFOTO\n", 1); 
else                                                logMmboxman("opened FIFOTO\n", 0);  

if((write(fifoto, &request, sizeof(Request))) != sizeof(Request))   logMmboxman("error in writing FIFOTO\n", 1);
else                                                                logMmboxman("written on FIFOTO\n", 0);
close(fifoto);

读者代码:

if((fifoto = open(FIFOTOMMBOXD, O_RDWR)) == -1)   logMmboxd("error in opening FIFOTO\n", 1); 
else                                              logMmboxd("opened FIFOTO\n", 0);  

if((read(fifoto, &request, sizeof(Request))) != sizeof(Request))   logMmboxd("error in reading FIFOTO\n", 1);
else                                                               logMmboxd("read from FIFOTO\n", 0);
close(fifoto);

printf("%s\n", request.name);

Answer 1

您可能正在通过管道发送 Request.name 的地址。当接收者得到它时，Request.name显然指向无效内存。