int main(void) {
key_t key = ftok("/sys/ipc", 0);
int shmid = shmget(key, 1024, IPC_CREATE | 0x0604);
}
when I run this code second time, because the key collision so the value of shmid is -1
How can I delete the key I set before?
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What's the value of `key` after the call to `ftok`? – Jabberwocky Apr 19 '16 at 10:01
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16842754, this one.. – 刘健坤 Apr 19 '16 at 10:03
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Maybe [this SO question](http://stackoverflow.com/questions/5656530/how-to-use-shared-memory-with-linux-in-c) helps. – Jabberwocky Apr 19 '16 at 10:05