Implement mechanism to signal other threads #7893
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Implement bpf_send_signal_task kfunc that is similar to bpf_send_signal_thread and bpf_send_signal helpers but can be used to send signals to other threads and processes. It also supports sending a cookie with the signal similar to sigqueue(). If the receiving process establishes a handler for the signal using the SA_SIGINFO flag to sigaction(), then it can obtain this cookie via the si_value field of the siginfo_t structure passed as the second argument to the handler. Signed-off-by: Puranjay Mohan <[email protected]> Acked-by: Andrii Nakryiko <[email protected]>
Add testcases to test bpf_send_signal_task(). In these new test cases, the main process triggers the BPF program and the forked process receives the signals. The target process's signal handler receives a cookie from the bpf program. Signed-off-by: Puranjay Mohan <[email protected]>
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Pull request for series with
subject: Implement mechanism to signal other threads
version: 5
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=899676