實驗：sigsuspend(),sigprocmask()
源代碼：

/*

* Program: pause_suspend.c

* To test the difference between sigsuspend() and paus().

* Author: zsl

* Date: 2014-10-17

* First release.

* 參見網(wǎng)頁：http://blog.csdn.net/liwentao1091/article/details/6619089

*

* */

#include <stdio.h>

#include <stdlib.h>

#include <signal.h>

#include <unistd.h>

#include <string.h>

/*

* Handler for SIGINT (Ctrl-C), SIGQUIT (Ctrl-\)

* */

void sig_func(int signo)

{

if ( SIGINT == signo ) // just print a line.

{

printf(" SIGINT is processing...\n ");

}

if ( SIGQUIT == signo ) // print a line and exit.

{

printf(" SIGQUIT is processing ...\n ");

printf(" Now exiting ...\n ");

exit(EXIT_SUCCESS);

}

}

int main(void)

{

int i;

sigset_t maskset, set_quit;

sigemptyset(&maskset);

sigemptyset(&set_quit); // initialize two sets.

sigaddset(&maskset, SIGINT); // mask SIGINT

sigaddset(&set_quit, SIGQUIT); // suspend SIGQUIT

// signal the two signals: SIGINT, SIGQUIT

signal(SIGINT, sig_func);

signal(SIGQUIT, sig_func);

while(1)

{

/* First to mask the signal of the process: SIGINT */

sigprocmask(SIG_BLOCK, &maskset, NULL);

for(i = 0; i < 10; i ++)

{

write(1, "* ", strlen("* "));

sleep(1);

}

printf("\n");

#if 1

/*

* while sigsuspend(), SIGQUIT is blocked.

* but SIGINT is unblocked.

* If you want to execute the two signals, you

* should Ctrl-\, then Ctrl-C.

* */

printf("Before sigsuspend() ... \n");

sigsuspend(&set_quit);

#else

sigprocmask(SIG_UNBLOCK, &maskset, NULL);

pause();

#endif

}

return 0;

}

程序的運行：在打印“* ?”的時候，SIGINT （Ctrl-C）被 阻塞了。而SIGQUIT沒有被阻塞，只要Ctrl-\就會終止程序。在sigsuspend() 的時候，SIGQUIT （Ctrl-\）被阻塞了，而SIGINT 沒有被阻塞，只要 Ctrl-C 就會進入 signal handler 中執(zhí)行。。如果想在 sigsuspend() 中對兩個信號都進行處理，那么在 sigsuspend() 的時候先 SIGQUIT, 然后 SIGINT。如下是執(zhí)行效果圖：


來自為知筆記(Wiz)

轉(zhuǎn)載于:https://www.cnblogs.com/LinTeX9527/p/4031428.html

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