我编写这个程序是为了捕获Ctrl-C和-\//
// main.c
// Project 4
//
// Found help with understanding and coding at
// http://www.thegeekstuff.com/2012/03/catch-signals-sample-c-code/
//
#include<stdio.h>
#include<signal.h>
#include<unistd.h>
//signal handling function that will except ctrl- and ctrl-c
void sig_handler(int signo)
{
//looks for ctrl-c which has a value of 2
if (signo == SIGINT)
printf("nreceived SIGINTn");
//looks for ctrl- which has a value of 9
else if (signo == SIGQUIT)
printf("nreceived SIGQUITn");
}
int main(void)
{
//these if statement catch errors
if (signal(SIGINT, sig_handler) == SIG_ERR)
printf("ncan't catch SIGINTn");
if (signal(SIGQUIT, sig_handler) == SIG_ERR)
printf("ncan't catch SIGQUITn");
//Runs the program infinitely so we can continue to input signals
while(1)
sleep(1);
return 0;
}
有一个在线教程。
SIGINT
可以直接使用,但您应该使用sigaction
而不是signal
。
要捕获SIGCHLD
,您可以使用教程中的代码,并可以使用其中一个wait()
函数获取子状态。
void handle_sigchld(int sig) { int saved_errno = errno; while (waitpid((pid_t)(-1), 0, WNOHANG) > 0) {} errno = saved_errno; } struct sigaction sa; sa.sa_handler = &handle_sigchld; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART | SA_NOCLDSTOP; if (sigaction(SIGCHLD, &sa, 0) == -1) { perror(0); exit(1); }