hi all,
i have a question regarding mmap and file write. a file is mmap'ed and
data is written into the mapped region. now the same region is written.
(as shown below)
buf = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
.
. /* some data put in buf */
.
write(fd, buf, len);
now does this lead to unnecessary copies?? more specifically what
happens if two virtual addresses point to the same physical address and
data is copied from one to the other.
thanx in advance
joy
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