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PTHREAD_SIGQUEUE(3) FreeBSD Library Functions Manual PTHREAD_SIGQUEUE(3) NAME pthread_sigqueue - queue a signal to a specified thread LIBRARY POSIX Threads Library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> #include <signal.h> int pthread_sigqueue(pthread_t thread, int sig, const union sigval value); DESCRIPTION The pthread_queue() function queues a signal, specified by sig, to a thread, specified by thread. If sig is 0, error checking is performed, but no signal is actually sent. The value is queued together with the signal, and becomes available in siginfo_t data passed to the signal handler. The pthread_sigqueue function is similar to sigqueue(2), but targets a thread in the current process instead of a process. See sigqueue(2) for details about signal queueing and delivery selection. RETURN VALUES If successful, pthread_sigqueue() returns 0. Otherwise, an error number is returned. ERRORS The pthread_sigqueue() function will fail if: [EAGAIN] No resources are available to queue the signal. The current process has already queued {SIGQUEUE_MAX} signals that are still pending, or a system-wide resource limit has been exceeded. [ESRCH] thread is an invalid thread ID. [EINVAL] sig is an invalid or unsupported signal number. SEE ALSO sigqueue(2) STANDARDS The pthread_sigqueue() function is a FreeBSD extension. An identical function with the same semantic is available in other operating systems. FreeBSD 14.1-RELEASE-p8 April 21, 2024 FreeBSD 14.1-RELEASE-p8