musl/src/signal/sigignore.c

#include <signal.h>
#include <stdlib.h>

int sigignore(int sig)
{
	struct sigaction sa;

	sigemptyset(&sa.sa_mask);
	sa.sa_handler = SIG_IGN;
	sa.sa_flags = 0;
	return sigaction(sig, &sa, NULL);
}