any one has knowladge in C unix opreating system .. please help Desc.pdf
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A process can send payload data with a signal by: 1. Using pipes or sockets for inter-process communication instead of signals which are not intended for excessive data transfer. 2. Alternatively, sharing a pipe between processes and writing data to the pipe in one process before sending a signal to the other process, which then reads the data from the pipe upon receiving the signal. 3. When using sigaction(), include the SA_SIGINFO flag so the signal handler receives a siginfo_t pointer containing a union sigval that holds an int or pointer payload.
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any one has knowladge in C unix opreating system .. please help Desc.pdf
- 1. any one has knowladge in C unix opreating system .. please help Describe how to use sigaction such that a process can send a payload with the signal that can be retrieved by the receiving process. Solution Signals are intented for passing an excessive data between processes. Consider another IPC mechanism like pipes, sockets etc. Or Alternatively you can use them in conjuction. Eg, share 2 ends of pipe between processes, then write something to it in process A , then send signal to process B. Delivering of a signal to process B is treated as readiness to tead from a pipe, then process B just reads data from a pipe, that were written by A. When installing sigaction() use SA_SIFINFO() so that the signature of handler is void signal_handler(int signum, siginfo_t *info, void *context), context is a pointer or an int stored in an union of type union sigval.