109 lines
2.4 KiB
C
109 lines
2.4 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 <sys/ipc.h>
|
|
#include <sys/shm.h>
|
|
#include <xpmem.h>
|
|
#include "util.h"
|
|
|
|
#define DEBUG
|
|
|
|
int sz_mem[] = {
|
|
4 * (1ULL<<10),
|
|
2 * (1ULL<<20),
|
|
1 * (1ULL<<30),
|
|
134217728};
|
|
|
|
#define SZ_INDEX 0
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
void *mem;
|
|
int ret = 0;
|
|
pid_t pid;
|
|
int status;
|
|
key_t key = ftok(argv[0], 0);
|
|
int shmid;
|
|
xpmem_segid_t segid;
|
|
|
|
shmid = shmget(key, sz_mem[SZ_INDEX], IPC_CREAT | 0660);
|
|
CHKANDJUMP(shmid == -1, 255, "shmget failed: %s\n", strerror(errno));
|
|
|
|
mem = mmap(0, sz_mem[SZ_INDEX], PROT_READ | PROT_WRITE,
|
|
MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
|
|
CHKANDJUMP(mem == MAP_FAILED, 255, "mmap failed\n");
|
|
memset(mem, 0, sz_mem[SZ_INDEX]);
|
|
|
|
pid = fork();
|
|
CHKANDJUMP(pid == -1, 255, "fork failed\n");
|
|
if (pid == 0) {
|
|
void *shm = shmat(shmid, NULL, 0);
|
|
|
|
CHKANDJUMP(shm == (void *)-1, 255, "shmat failed: %s\n",
|
|
strerror(errno));
|
|
|
|
while ((segid = *(xpmem_segid_t *)shm) == 0) {
|
|
};
|
|
|
|
ret = shmdt(shm);
|
|
CHKANDJUMP(ret == -1, 255, "shmdt failed\n");
|
|
|
|
xpmem_apid_t apid = xpmem_get(segid, XPMEM_RDWR,
|
|
XPMEM_PERMIT_MODE, NULL);
|
|
CHKANDJUMP(apid == -1, 255, "xpmem_get failed: %s\n",
|
|
strerror(errno));
|
|
|
|
struct xpmem_addr addr = { .apid = apid, .offset = 0 };
|
|
void *attach = xpmem_attach(addr, sz_mem[SZ_INDEX], NULL);
|
|
|
|
CHKANDJUMP(attach == (void *)-1, 255,
|
|
"xpmem_attach failed: %s\n", strerror(errno));
|
|
|
|
*((unsigned long *)attach) = 0x1234;
|
|
|
|
ret = xpmem_detach(attach);
|
|
CHKANDJUMP(ret == -1, 255, "xpmem_detach failed\n");
|
|
|
|
_exit(123);
|
|
} else {
|
|
void *shm = shmat(shmid, NULL, 0);
|
|
|
|
CHKANDJUMP(mem == (void *)-1, 255, "shmat failed: %s\n",
|
|
strerror(errno));
|
|
|
|
segid = xpmem_make(mem, sz_mem[SZ_INDEX], XPMEM_PERMIT_MODE,
|
|
(void *)0666);
|
|
CHKANDJUMP(segid == -1, 255, "xpmem_ioctl failed: %s\n",
|
|
strerror(errno));
|
|
|
|
*(xpmem_segid_t *)shm = segid;
|
|
|
|
ret = waitpid(pid, &status, 0);
|
|
CHKANDJUMP(ret == -1, 255, "waitpid failed\n");
|
|
|
|
printf("%lx\n", *((unsigned long *)mem));
|
|
|
|
struct shmid_ds buf;
|
|
|
|
ret = shmctl(shmid, IPC_RMID, &buf);
|
|
CHKANDJUMP(ret == -1, 255, "shmctl failed\n");
|
|
|
|
ret = shmdt(shm);
|
|
CHKANDJUMP(ret == -1, 255, "shmdt failed\n");
|
|
|
|
ret = xpmem_remove(segid);
|
|
CHKANDJUMP(ret == -1, 255, "xpmem_remove failed\n");
|
|
}
|
|
|
|
fn_exit:
|
|
return ret;
|
|
fn_fail:
|
|
goto fn_exit;
|
|
}
|