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by 'partial write', I mean that "write does not promise it will the exact number of bytes you required on success, It will return the actual number of bytes written"
'len' has nothing to do with...

void copy(FILE *in, FILE *out)
{
char buf[8192]={0x0};
ssize_t len=0;
while( ( len=read(fileno(in), buf, sizeof(buf) ) )>0)
write(fileno(out), buf, len);
}


Why...