自己写的，先记录一下:
#include
#include
#include
#include
#include
#include stat.h><br >#include types.h><br >#include ipc.h><br >#include shm.h><br >
#define SHM_KEY 0xff110000
#define BUFF_SIZE 102400 //100k
int main(int argc, char *argv[])
{
int fs;
int fd;
int shmid;
char *shmptr;
int len;
char fbuf [BUFF_SIZE];
struct stat buf;
fs = stat("index.html", &buf;);
len = (int) buf.st_size;
if(-1 != fs){
printf("file length: %d\n", len);
}
if(-1 !=( fd = open("index.html", O_RDONLY))){
read(fd,fbuf, len);
}
close(fd);
if(-1 != (shmid = shmget(SHM_KEY, 0, 0))){
if (-1 == shmctl(shmid, IPC_RMID, 0)){
printf("delete shm error\n");
exit(1);
}
}
if(-1 == (shmid = shmget(SHM_KEY, len, IPC_CREAT|0600))){
printf("shmget error!\n");
exit(1);
}
if((shmptr = shmat(shmid, 0, 0)) == (void *) -1){
printf("shmat error!\n");
exit(1);
}
strncpy(shmptr, fbuf, len);
shmdt(shmptr);
return 0;
}
读取共享内存内容：
#include
#include
#include
#include ipc.h><br >#include shm.h><br >
#define SHM_KEY 0xff110000
int main(int argc, char *argv[])
{
int shmid;
char *shmptr;
if(-1 ==(shmid = shmget(SHM_KEY, 0, 0))){
printf("shmget error!\n");
exit(1);
}
if((shmptr = shmat(shmid, 0, 0)) == (void *) -1){
printf("shmat error!\n");
exit(1);
}
printf("read from shm:%s \nfile len: %ld\n", shmptr,strlen(shmptr));
shmdt(shmptr);
return 0;
}