Ok, so I got alot of tips how to solve the problem regarding poll. How
ever, poll still returns instantly. It returns with POLLIN and POLLERR,
so something is probably wrong. I'm not a c-program expert, so maybe
someone can tell me what's wrong.
Here's what I've come up with so far:
#include <stdio.h>
#include <sys/poll.h>
#include <stdint.h>
int main () {
struct pollfd fd;
FILE *vcsa = fopen("/dev/vcsa", "rb");
uint8_t header[4];
fread(header, 0, sizeof(header), vcsa);
fd.fd = fileno(vcsa);
fd.events = POLLIN;
for(int i = 0; i < 30; i++) {
int ret = poll(&fd, 1, -1);
printf("%d ", fd.revents);
}
printf("\nPOLLIN = %d POLLERR = %d\n", POLLIN, POLLERR);
return 0;
}
On my machine, the program prints 30 9s and "POLLIN = 1 POLLERR = 8". It
terminates instantly, even if I set the number of iterations to 1000.
Something is clearly wrong!
I am running arch linux with kernel 4.18.16.
Tage
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