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我嘗試了一個來自此網站的示例:http://www.cs.cf.ac.uk/Dave/C/node24.html 有時,輸出不會顯示來自子進程的消息。 我想明白爲什麼?任何人都可以幫忙嗎?子進程無法正常工作
#include <stdio.h>
#include <signal.h>
void sighup(); /* routines child will call upon sigtrap */
void sigint();
void sigquit();
main()
{ int pid;
/* get child process */
if ((pid = fork()) < 0) {
perror("fork");
exit(1);
}
if (pid == 0)
{ /* child */
signal(SIGHUP,sighup); /* set function calls */
signal(SIGINT,sigint);
signal(SIGQUIT, sigquit);
for(;;); /* loop for ever */
}
else /* parent */
{ /* pid hold id of child */
printf("\nPARENT: sending SIGHUP\n\n");
kill(pid,SIGHUP);
sleep(3); /* pause for 3 secs */
printf("\nPARENT: sending SIGINT\n\n");
kill(pid,SIGINT);
sleep(3); /* pause for 3 secs */
printf("\nPARENT: sending SIGQUIT\n\n");
kill(pid,SIGQUIT);
sleep(3);
}
}
void sighup()
{ signal(SIGHUP,sighup); /* reset signal */
printf("CHILD: I have received a SIGHUP\n");
}
void sigint()
{ signal(SIGINT,sigint); /* reset signal */
printf("CHILD: I have received a SIGINT\n");
}
void sigquit()
{ printf("My DADDY has Killed me!!!\n");
exit(0);
}
解決方案 - 在fork()之前設置信號處理程序然後在父項中取消設置 – tobyodavies 2010-11-24 02:46:58