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#include "stdio.h"
#include "stdlib.h"
#include "unistd.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <signal.h>
static void sig_int(int signo){
return;
}
int main(int argc, char* argv[]){
if(argc < 2){
printf("Too few arguments!\n");
exit(1);
}
int fd = open(argv[1], O_RDONLY);
if(fd < 0){
printf("open failure\n");
exit(1);
}
struct stat st;
if(fstat(fd, &st) < 0){
printf("stat error\n");
exit(1);
}
int len = st.st_size;
printf("size = %d\n", len);
void* pmap;
pmap = mmap(0, len, PROT_READ,MAP_SHARED | MAP_POPULATE,fd, 0);
printf("pmap = 0x%016x\n", pmap);
if(!pmap){
printf("map error\n");
close(fd);
exit(1);
}
for(int i = 0; i < len;i++){
char c = ((char*)pmap)[i];
}
printf("pinning pages...\n");
if(mlock(pmap, len) == -1){
printf("mlock error");
close(fd);
exit(1);
}
printf("done pinning...\n");
sigset_t set;
sigemptyset(&set);
sigaddset(&set,SIGINT);
int sig;
signal(SIGINT, sig_int);
sigwait(&set, &sig);
printf("unpinning pages...\n");
if(munlock(pmap, len) < 0){
printf("munlock error\n");
}
munmap(pmap, len);
close(fd);
return 0;
}
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