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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/mman.h>
static void *mkmap(unsigned sz)
{
int shmid = shmget(IPC_PRIVATE, sz,
IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR);
assert(shmid != -1);
void *addr = shmat(shmid, NULL, 0);
assert(addr != (void *)-1);
return addr;
}
int main()
{
void *np, *p;
p = mkmap(1024*1024);
np = mremap(p, 1024*1024, 2048*1024, MREMAP_MAYMOVE); /* grow, maymove */
assert(np != (void *)-1);
return 0;
}
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