45 lines
909 B
C
45 lines
909 B
C
#include <bits/types/sigset_t.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void int_hander(int s)
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{
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write(1, "!", 1);
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}
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int main(int argc, char **argv)
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{
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int i;
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int j;
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sigset_t set;
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sigset_t oldset;
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sigset_t saveset;
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//! 要考虑原来是否阻塞的
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signal(SIGINT, int_hander);
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sigemptyset(&set);
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sigaddset(&set, SIGINT);
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sigprocmask(SIG_UNBLOCK, &set, &saveset);
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for (j = 0; j < 1000; j++)
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{
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sigprocmask(SIG_BLOCK, &set, &oldset);
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for (i = 0; i < 5; i++)
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{
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write(1, "*", 1);
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sleep(1);
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}
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write(1, "\n", 1);
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// sigprocmask(SIG_UNBLOCK, &set, NULL);
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sigprocmask(SIG_SETMASK, &oldset, NULL);
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}
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// ctrl+\ : quit信号快捷方式
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//!!! 还原原来的阻塞状态
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sigprocmask(SIG_SETMASK, &saveset, NULL);
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exit(0);
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} |