When I do this (note the included \n):
printf("Something.\n");
I would like it not to flush the buffer. I would like to manually flush it later.
Is this possible?
This question sort of asks the same thing, but asks about C++ instead of C. I don't see how I could gather how to do this in C by reading the answers to that question (so it's not a duplicate).
As explained in the comments, setvbuf can be used to change the buffering of any file stream, including stdout.
Here is a simple example:
#include <stdio.h>
#include <unistd.h>
int main(void)
{
setvbuf(stdout, NULL, _IOFBF, 0);
printf("hello world\n");
sleep(5);
}
The example uses setvbuf to make stdout fully buffered. Which means it will not immediately output upon encountering a newline. The example will only display the output after the sleep (flush on exit). Without the setvbuf the output will be displayed before the sleep.
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