46
test/issues/1065/file_map.c
Normal file
46
test/issues/1065/file_map.c
Normal file
@ -0,0 +1,46 @@
|
||||
#include <stdio.h>
|
||||
#include <unistd.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <fcntl.h>
|
||||
#include <sys/mman.h>
|
||||
|
||||
#define FILE_SIZE 1024
|
||||
#define CMD_SIZE 128
|
||||
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
int fd;
|
||||
void *file_map;
|
||||
long page_size, file_map_size;
|
||||
char command[CMD_SIZE];
|
||||
|
||||
if (argc < 2) {
|
||||
printf("Error: too few arguments\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
fd = open(argv[1], O_RDWR);
|
||||
|
||||
if (fd < 0) {
|
||||
printf("Error: open %s\n", argv[1]);
|
||||
return -1;
|
||||
}
|
||||
|
||||
page_size = sysconf(_SC_PAGESIZE);
|
||||
file_map_size = (FILE_SIZE / page_size + 1) * page_size;
|
||||
|
||||
file_map = mmap(0, file_map_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
|
||||
if (file_map == MAP_FAILED) {
|
||||
printf("Error: mmap file\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
sprintf(command, "cat /proc/%d/maps", getpid());
|
||||
system(command);
|
||||
|
||||
close(fd);
|
||||
munmap(file_map, file_map_size);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user