Linux消息队列实例大全

#include <stdio.h> #include <stdlib.h> #include <errno.h> #include <sys/types.h> #include <sys/ipc.h> #include <sys/msg.h> typedef struct { long int nType; char szText[256]; }MSG; main() { key_t lKey; int n,nMsgId; MSG msg; struct msqid_ds qds; if((lKey = ftok("/etc/profile",1)) == -1) { perror("ftok"); exit(1); } if((nMsgId = msgget(lKey,0)) == -1) { perror("ftok"); exit(2); } memset(&qds,0x00,sizeof(struct msqid_ds)); if(msgctl(nMsgId,IPC_STAT,&qds) < 0) { perror("msgctl IPC_STAT"); exit(3); } printf("msg_perm.mode=%d\n",qds.msg_perm.mode); qds.msg_perm.mode &= (~0222); if(msgctl(nMsgId,IPC_SET,&qds) < 0) { perror("msgctl IPC_SET"); exit(4); } memset(&msg,0x00,sizeof(MSG)); msg.nType = 2; memcpy(msg.szText,"12345",5); if(msgsnd(nMsgId,(void *)&msg,5,0) < 0) { perror("msgsnd"); } if(msgctl(nMsgId,IPC_RMID,NULL) < 0) { perror("msgctl IPC_RMID"); exit(5); } return 0; }