On Tue, 31 Mar 2015 17:11:33 +0530, Ssagarr Patil said:
Hi,
while (loop) { /* get the current file size of output file */ filesize = lseek(outfd, 0, SEEK_END);
/* Increase file size */ ftruncate(outfd, (off_t)filesize + (off_t)buf.size
Are you sure you want to do these two *every time* through the loop?
/* mmap destination file */ if((dest = mmap(0, buf.size, PROT_WRITE, MAP_SHARED, outfd, filesize)) == (void *) -1) {
Similarly here - usually the *entire* file gets mmap'ed. Also, what did perror() output? (probably nothing, since you stuck a printf in front of it, which probably reset errno on you).
memcpy(dest, src, size); munmap(dest);
You're not going to achieve faster throughput by adding to the syscall overhead.
}