- 与信号集操作相关的函数
#include <signal.h>
清空信号集 全都为0
int sigemptyset(sigset_t *set);填充信号集 全都为1
int sigfillset(sigset_t *set);添加某个信号到信号集
int sigaddset(sigset_t *set, int signum);从集合中删除某个信号
int sigdelset(sigset_t *set, int signum);判断信号是否在信号集中
int sigismember(const sigset_t *set, int signum);以上函数的返回值
sigemptyset(), sigfillset(), sigaddset(), and sigdelset() return 0 onsuccess and -1 on error.sigismember() returns 1 if signum is a member of set, 0 if signum isnot a member, and -1 on error.
- 用来设置或者是解除阻塞信号的函数
#include <signal.h>
int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
参数介绍：
howSIG_BLOCK 设置阻塞The set of blocked signals is the union of the current set andthe set argument.SIG_UNBLOCK 解除阻塞The signals in set are removed from the current set of blockedsignals. It is permissible to attempt to unblock a signal whichis not blocked.SIG_SETMASK 设置set为新的阻塞信号集The set of blocked signals is set to the argument set.set 传入的信号集
oldset 传出的信号集
return：
sigprocmask() returns 0 on success and -1 on error.
- sigpending函数
读取当前进程的未决信号集
man sigpending
#include <signal.h>
int sigpending(sigset_t *set);
set为传出参数
返回值：成功0， 失败-1，设置errno
- 代码案例：
设置屏蔽信号集，然后发送信号，然后打印当前未决信号集
#include <signal.h>
#include <stdio.h>
#include <unistd.h>int main() {sigset_t pend, setShield;sigemptyset(&setShield);sigaddset(&setShield, SIGINT);sigaddset(&setShield, SIGQUIT);sigprocmask(SIG_BLOCK, &setShield, NULL);while (1) {sigpending(&pend);int i=1;for(; i<32; ++i) {printf("%d", sigismember(&pend, i));}printf("\n");sleep(1);}return 0;
}
// 0110000000000000000000000000000
