c语言基础:shmget

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#include <sys/types.h> #include <sys/sem.h> #include <stdio.h> #include <sys/ipc.h> #include <sys/shm.h> #define LOG_SHM_KEY ftok(".", 'c')   int main (int argc, char **argv) {   key_t semkey;   int shmid;     semkey = LOG_SHM_KEY;        printf ("key=%d\n", semkey);     shmid = shmget(semkey, 32000, IPC_CREAT|IPC_EXCL|600);   //shmid = shmget (semkey, 0, 0);   if (shmid == -1)     {       shmid = shmget (semkey, 32000, IPC_CREAT);           }     return 0; }