Unix Shared Memory

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Keys: 1/2 To use shared memory, include the following: #include #include #include A key is a value of type key_t. There are three ways to generate a key: Do it yourself Use function ftok() Ask the system to provide a private key. 4
Keys: 2/2 Do it yourself: use key_t SomeKey; SomeKey = 1234; Use ftok() to generate one for you: key_t = ftok(char *path, int ID); path is a path name (e.g., “./”) ID is an integer (e.g., ‘a’) Function ftok() returns a key of type key_t: SomeKey = ftok(“./”, ‘x’); Keys are global entities. If other processes know your key, they can access your shared memory. Ask the system to provide a private key using IPC_PRIVATE. 5
Page 1 and 2: Unix Shared Memory 1
Page 3: Procedure for Using Shared Memory F
Page 7 and 8: Asking for a Shared Memory: 2/4 The
Page 9 and 10: Asking for a Shared Memory: 4/4 Whe
Page 11 and 12: Attaching a Shared Memory: 1/3 Use
Page 13 and 14: Attaching a Shared Memory: 3/3 Proc
Page 15 and 16: Communicating with a Child: 1/2 voi
Page 17 and 18: Communicating Among Separate Proces

Unix Shared Memory

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