prmask.c

来自「UNIX环境高级编程书的源代码」· C语言 代码 · 共 25 行

#include "apue.h"
#include <errno.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;
}