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- NAME
- sigqueue - queue a signal and data to a process
- SYNOPSIS
- #include <signal.h>
- int sigqueue(pid_t pid, int sig, const union sigval value);
- DESCRIPTION
- sigqueue() sends the signal specified in sig to the process whose PID is given in pid. The permissions required to send a
- signal are the same as for kill(2). As with kill(2), the null signal (0) can be used to check if a process with a given PID
- exists.
- The value argument is used to specify an accompanying item of data (either an integer or a pointer value) to be sent with
- the signal, and has the following type:
- union sigval {
- int sival_int;
- void *sival_ptr;
- };
- If the receiving process has installed a handler for this signal using the SA_SIGINFO flag to sigaction(2), then it can
- obtain this data via the si_value field of the siginfo_t structure passed as the second argument to the handler. Further-
- more, the si_code field of that structure will be set to SI_QUEUE.
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