A signal is used in the UNIX system to notify a process that a particular event has occurred. A signal may be received either synchronously or asynchronously depending on the source and the reason for the event being signalled. A signal must follow the following pattern –
1. A signal is generated by the occurrence of a particular event.
2. A generated signal is delivered to a particular process.
3. The signal must be handled after receiving at the process.
In this problem, the message is sent from one user to another user using kill function. kill function takes two inputs – process id of the receiver process and signal type. For this purpose, we use a shared memory where we store the process id(s) of two processes. We use a handler function which will print the message received from another process. User2 will start to send message to User1 and then they will continue chatting.
- POSIX shared-memory API
- Communication between two process using signals in C
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- How to create a Shared Folder between two Local User in Linux?
- Zombie and Orphan Processes in C
- Zombie Processes and their Prevention
- fork() to execute processes from bottom to up using wait()
- Using fork() to produce 1 parent and its 3 child processes
- Program to show that Linux provides time sharing environment to processes
- unordered_multimap and its application
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- fesetround() and fegetround() in C++ and their application
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- isspace() in C/C++ and its application to count whitespace characters
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