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我的ubuntu 11.04 是不是不支持共享内存?
来源: 互联网 发布时间:2017-03-01
本文导语: 今天做共享内存实验,编译不通过,检查无果,求大侠解救。谢谢!! 源程序: #include #include #include #include #include "shm_com.h" #include #include #include //#define BUF 1024; int main() { int running=1; void *shared_m...
今天做共享内存实验,编译不通过,检查无果,求大侠解救。谢谢!!
源程序:
#include
#include
#include
#include
#include "shm_com.h"
#include
#include
#include
//#define BUF 1024;
int main()
{
int running=1;
void *shared_memory=(void *)0;//??
struct shared_use_st *shared_stuff;
int shmid;
char buffer[BUFSIZ];//这个BUFSIZ 是多少???注:BUFSIZ宏在stdio.h中定义
/*创建共享内存*/
shmid=shmget((key_t)1234,sizeof(struct shared_use_st),0666|IPC_CREAT);
if(shmid==-1)
{
fprintf(stderr,"shmget failed n");
exit(EXIT_FAILURE);
}
/*映射共享内存*/
shared_memory=shmat(shmid,(void *)0,0);
if(shared_memory==(void *)-1)
{
fprintf(stderr,"shmat failed n");
exit(EXIT_FAILURE);
}
printf("memory attached at %X n",(int)shared_memory);
/*让结构体指针指向这块内存*/
shared_stuff=(struct shared_use_st *)shared_memory;
/*控制读写顺序*/
shared_stuff->written_by_you=0;
/*循环从共享内存中读数据,直到读到“end"为止*/
while(running)
{
if(shared_stuff->written_by_you==1)
{
sleep(1);//??读进程读了之后再写
printf("waiting for client...n");
}
printf("enter some text:");
fgets(buffer,BUFSIZ,stdin);
strncpy(shared_stuff->some_text,buffer,TEXT_SZ);
shared_stuff->written_by_you=0;
if(strncmp(shared_stuff->some_text,"end",3)==0)
{
running=0;//结束循环
}
}
/*删除共享内存*/
if(shmdt(shared_memory)==-1)
{
fprintf(stderr,"shmdt failed n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
编译:
qust@qust-K42JZ:~/test$ gcc shm2.c -o shm2
In file included from /usr/include/i386-linux-gnu/sys/ipc.h:29:0,
from /usr/include/i386-linux-gnu/sys/shm.h:28,
from shm2.c:6:
/usr/include/i386-linux-gnu/bits/ipctypes.h:31:9: 错误: expected ‘;’, identifier or ‘(’ before ‘unsigned’
这难道是系统里地文件出错了??/?我没动里面的内容啊!
源程序:
#include
#include
#include
#include
#include "shm_com.h"
#include
#include
#include
//#define BUF 1024;
int main()
{
int running=1;
void *shared_memory=(void *)0;//??
struct shared_use_st *shared_stuff;
int shmid;
char buffer[BUFSIZ];//这个BUFSIZ 是多少???注:BUFSIZ宏在stdio.h中定义
/*创建共享内存*/
shmid=shmget((key_t)1234,sizeof(struct shared_use_st),0666|IPC_CREAT);
if(shmid==-1)
{
fprintf(stderr,"shmget failed n");
exit(EXIT_FAILURE);
}
/*映射共享内存*/
shared_memory=shmat(shmid,(void *)0,0);
if(shared_memory==(void *)-1)
{
fprintf(stderr,"shmat failed n");
exit(EXIT_FAILURE);
}
printf("memory attached at %X n",(int)shared_memory);
/*让结构体指针指向这块内存*/
shared_stuff=(struct shared_use_st *)shared_memory;
/*控制读写顺序*/
shared_stuff->written_by_you=0;
/*循环从共享内存中读数据,直到读到“end"为止*/
while(running)
{
if(shared_stuff->written_by_you==1)
{
sleep(1);//??读进程读了之后再写
printf("waiting for client...n");
}
printf("enter some text:");
fgets(buffer,BUFSIZ,stdin);
strncpy(shared_stuff->some_text,buffer,TEXT_SZ);
shared_stuff->written_by_you=0;
if(strncmp(shared_stuff->some_text,"end",3)==0)
{
running=0;//结束循环
}
}
/*删除共享内存*/
if(shmdt(shared_memory)==-1)
{
fprintf(stderr,"shmdt failed n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
编译:
qust@qust-K42JZ:~/test$ gcc shm2.c -o shm2
In file included from /usr/include/i386-linux-gnu/sys/ipc.h:29:0,
from /usr/include/i386-linux-gnu/sys/shm.h:28,
from shm2.c:6:
/usr/include/i386-linux-gnu/bits/ipctypes.h:31:9: 错误: expected ‘;’, identifier or ‘(’ before ‘unsigned’
这难道是系统里地文件出错了??/?我没动里面的内容啊!
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9成的可能是#include "shm_com.h"这个文件有问题。查查。