67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <sys/mman.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <sys/wait.h>
|
|
#include "util.h"
|
|
|
|
#define DEBUG
|
|
|
|
int sz_mem[] = {
|
|
4 * (1ULL<<10),
|
|
2 * (1ULL<<20),
|
|
1 * (1ULL<<30),
|
|
134217728};
|
|
|
|
#define SZ_INDEX 0
|
|
#define NUM_AREAS 1
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
void *mem;
|
|
int ret = 0;
|
|
pid_t pid;
|
|
int status;
|
|
int fd;
|
|
unsigned long val;
|
|
|
|
pid = fork();
|
|
CHKANDJUMP(pid == -1, 255, "fork failed\n");
|
|
if (pid == 0) {
|
|
fd = open("./file", O_RDWR);
|
|
CHKANDJUMP(fd == -1, 255, "open failed\n");
|
|
|
|
mem = mmap(0, sz_mem[SZ_INDEX], PROT_READ | PROT_WRITE,
|
|
MAP_SHARED, fd, 0);
|
|
CHKANDJUMP(mem == MAP_FAILED, 255, "mmap failed\n");
|
|
|
|
val = *((unsigned long *)mem);
|
|
printf("val=%lx\n", val);
|
|
|
|
_exit(123);
|
|
} else {
|
|
fd = open("./file", O_RDWR);
|
|
CHKANDJUMP(fd == -1, 255, "open failed\n");
|
|
|
|
mem = mmap(0, sz_mem[SZ_INDEX], PROT_READ | PROT_WRITE,
|
|
MAP_SHARED, fd, 0);
|
|
CHKANDJUMP(mem == MAP_FAILED, 255, "mmap failed\n");
|
|
|
|
val = *((unsigned long *)mem);
|
|
printf("val=%lx\n", val);
|
|
|
|
ret = waitpid(pid, &status, 0);
|
|
CHKANDJUMP(ret == -1, 255, "waitpid failed\n");
|
|
printf("exit status=%d\n", WEXITSTATUS(status));
|
|
}
|
|
|
|
fn_exit:
|
|
return ret;
|
|
fn_fail:
|
|
goto fn_exit;
|
|
}
|