发送队列消息

#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/ipc.h>#include <sys/msg.h>#include <errno.h>#include <string.h>/* *  */typedef struct{long int nType;char szText[256];}MSG;int main(int argc, char** argv) {    key_t IKey1;    int nMsgId;    MSG msg;    if((IKey1 = ftok("/etc/profile",1)) == -1)    {        perror("ftok");        exit(1);    }    if((nMsgId = msgget(IKey1,IPC_CREAT|IPC_EXCL|0666)) == -1)    {        if(errno != EEXIST)        {            perror("msgget");            exit(2);        }                if((nMsgId = msgget(IKey1,0)) == -1)        {            perror("msgget");            exit(3);        }    }    printf("KeyID=%x\n",IKey1);    printf("MsgID=%d\n",nMsgId);        memset(&msg,0x00,sizeof(MSG));    msg.nType = 2;    memcpy(msg.szText,"123456",6);    if(msgsnd(nMsgId,(const void*)&msg,strlen(msg.szText),IPC_NOWAIT)<0)    {        perror("msgsnd");    }       return 0;}

运行结果， 2 为两个消息，12 为长度，666为rwx

[root@64 ~]# ipcs -q------ Message Queues --------key        msqid      owner      perms      used-bytes   messages    0x010088c2 0          root       666        12           2           [root@elm64 ~]#