c - C: "read: Bad Address" and "write: Bad Address"

Question

I want to Server-Client model with FIFO's and Client get directory path but I get errors "read: Bad address" and "write: Bad address".

Client

Server's Error : "read: Bad address"

Client's Error : "write: Bad address"

Answer 1

可能您误用了read和的返回值write。成功时，它们返回正值，您将它们作为错误处理。

读取字符串的大小时也不知道。所以strlen是不合适的。

 if( (controlRead = read(fdp,pathName,sizeof(pathName)) ) <= 0)
 {
     // error ...

与 相同的条件write。

传输字符串时，最好同时传输字符串长度：

写作：

void write_string(int fd, const char *string)
{
    size_t len = strlen(string);
    write(fd, &len, sizeof(len));
    write(fd, string, len);
}

阅读：

void read_string(int fd, char *buffer, size_t size, size_t *len)
{
    size_t t_len;

    read(fd, &t_len, sizeof(t_len));
    if (t_len > size) t_len = size;
    read(fd, buffer, t_len);
    if (t_len < size) buffer[t_len] = 0; // null-terminate if there is enough space
    if (len) *len = t_len; // return length if wanted
}