linux下共享内存(shm)使用示例

#include <sys/ipc.h>
#include <stdio.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#define PERM IPC_CREAT //S_IRUSR|S_IWUSR
#include <errno.h>
int main(int argc,char **argv)
{
int shmid[2048];
char *p_addr,*c_addr;
if(argc!=2)
{
fprintf(stderr,"Usage:%s InputString\n\a",argv[0]);
return 1;
}
int i =0;
for ( i = 0; i<1024; i++ )
{
char *p = new char[1024*1024];
if ( NULL == p )
{
printf( "error new\n" );
return -1;
}
}
for ( i =0; i<1026; i++ )
{
if((shmid[i]=shmget(IPC_PRIVATE,/*1610612736*/ 1024*1024,PERM))==-1)
{
fprintf(stderr,"Create Share Memory Error:%s\n\a",strerror(errno));
return 1;
}
{
p_addr=(char*)shmat(shmid[i],0,0);
p_addr[0] = i/1000 + '0';
p_addr[1] = i%1000/100 + '0';
p_addr[2] = i%100/10 + '0';
p_addr[3] = i%10 + '0';
p_addr[4] = '\0';
printf( "%d, %s\n", i, p_addr );
}
}
}