43 lines
905 B
C
43 lines
905 B
C
#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/eventfd.h>
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#include <sys/select.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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// 子线程或子进程模拟事件发生
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void trigger_event(unsigned int delay_sec) {
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printf("[child] triggere event after %u seconds...\n", delay_sec);
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sleep(delay_sec);
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printf("[child] Event triggered.\n");
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}
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int main() {
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pid_t pid = fork();
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if (pid < 0) {
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perror("fork");
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exit(1);
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}
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if (pid == 0) {
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// 子进程：触发事件
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trigger_event(3);
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exit(0);
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}
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// 父进程：使用 select 等待事件发生
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printf("[parent] Waiting for child %d exit...\n", pid);
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// wait for child process to finish
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int status;
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waitpid(pid, &status, 0);
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printf("[parent] Child exited with status: %d\n", WEXITSTATUS(status));
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return 0;
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} |