prmask.c

该代码为unix环境高级编程的源代码

#include	<errno.h>
#include	<signal.h>
#include	"ourhdr.h"

void
pr_mask(const char *str)
{
	sigset_t	sigset;
	int			errno_save;

	errno_save = errno;		/* we can be called by signal handlers */
	if (sigprocmask(0, NULL, &sigset) < 0)
		err_sys("sigprocmask error");

	printf("%s", str);
	if (sigismember(&sigset, SIGINT))	printf("SIGINT ");
	if (sigismember(&sigset, SIGQUIT))	printf("SIGQUIT ");
	if (sigismember(&sigset, SIGUSR1))	printf("SIGUSR1 ");
	if (sigismember(&sigset, SIGALRM))	printf("SIGALRM ");
		/* remaining signals can go here */
	printf("\n");
	errno = errno_save;
}