Linux_Study/sigset.c at master · ixuanwu/Linux_Study · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
/*************************************************************************
	> File Name: sigset.c
	> Author: jianghechao
	> Mail: 591378033@qq.com
	> Created Time: Tue 06 May 2014 06:59:27 PM CST
 ************************************************************************/

#include<stdio.h>
#include"apue.h"
#include<signal.h>
#include<sys/wait.h>
#include<error.h>

#define SIGBA(signo)  ((signo)<=0||(signo)>=NSIG)

int sigaddset(sigset_t *set,int signo)
{
	if(SIGBAD(signo))
	{
		errno=EINVAL;
		return -1;
	}
	*set|=1<<(signo-1);
	return 0;
}
int sigdelset(sigset_t *set,int signo)
{
	if(SIGBAD(signo))
	{
		errno = EINVAL;
		return -1;
	}
	*set&=~(1<<(signo-1));
	return 0;
}
int sigismember(const sigset_t *set, int signo)
{
	if(SIGBAD(signo))
	{
		errno = EINVAL;
		return -1;
	}
	return ((*set&(1<<(signo-1)))!=0);
}
int main()
{

	return 0;
}