c/c++语言开发共享无法增加共享内存的大小

请你帮助我好吗？ 我不能增加我的谢尔德记忆的大小。 代码在Linux上用C语言编写。

我需要65536字节，但似乎只允许49152 …如果我增加它，shmget失败…（在我的代码中： shmid < 0 ）我试图找出我的最大共享内存大小并增加它：

 sysctl -w kernel.shmmax=2147483648 

但这没有帮助，初始化再次失败。

这是我的代码：

  #define SHM_KEY 9877 #define SHM_SIZE 65536 int SHM_init (int shmid, char** shm, key_t key, long int size) { /* Create a new (System V) shared memory segment of the specified size */ shmid = shmget(key, SHM_SIZE, IPC_CREAT|0777); /* Check if SHM creation was successful */ if (shmid < 0) { /* DBG: Debug message to show which point of the program has been passed */ DBG_PRINT("Cn"); /* Check if creation failed because of already existing SHM */ if (EEXIST == errno) { /* DBG: Debug message to show which point of the program has been passed */ DBG_PRINT("CCn"); /* Delete already existing SHM with shmctl */ shmctl(shmid, IPC_RMID, NULL); } else { /* DBG: Debug message to show which point of the program has been passed */ DBG_PRINT("CCCn"); } /* Creation and initialization of SHM failed */ return -1; } /* Attach the SHM data pointer to the previously created SHM segment */ *shm = shmat(shmid, NULL, 0); if(*shm == (char *) -1) { /* Attaching failed */ return -1; } DBG_PRINT("Shared Memory Initialization successfuln"); /* Creation and initialization of shared memory was successful */ return 0; } 

非常感谢你…

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