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socket : read error Bad address

UDP socket : read error Bad address

在写UDP server,在调用套接字读取的时候发生了这个错误, 通过看errno.h 可以看到对应的错误号  EFAULT:
Bad address (POSIX.1),在stackoverflow上看到的这个解释不错:
It happen if the memory address of some argument passed to sendto (or more generally to any system call) is invalid. Think of it as a sort of SIGSEGV in kernel land regarding your syscall. For instance, if you pass a null or invalid buffer pointer (for reading, writing, sending, recieving...)。说明在对套接字上调用某些函数的时候传入了空指针等非法参数,的确如此。

























socket : read error Bad address