signal信号

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <signal.h>

void handler(int signum)
{
    puts("windows!!!");
}

int main(int argc, char *argv[])
{
    signal(SIGWINCH,handler);
    getchar();
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <signal.h>

void handler(int signum)
{
    static int count = 0;
    count++;
    printf("hello i‘m signal %d,count = %d\n",signum,count);
}

void child_process(int signum)
{
    puts("i‘m process my child");
    wait(NULL);
}

int main(int argc, char *argv[])
{
    int i;
    printf("pid = %d\n",getpid());

    for(i = 1;i <= 64;i++)
    {
        if(SIG_ERR == signal(i,handler))
            printf("error = %d\n",i);
    }

//.    signal(17,child_process);

    pid_t pid = fork();

    if(pid == 0)
    {
        printf("child pid = %d\n",getpid());
        sleep(2);
        exit(0);
    }
    
//    wait(NULL);

    getchar();

    return 0;
}