/*

编写一个程序，使用信号，读入终端输入的字符，并将其中的小写字母转换成大写字母后输出
*/
#include <stdio.h>
#include <signal.h>

void sigcatcher(int signum);

int main(int argc, char *argv[])
{
char buffer1[100],buffer2[100];
int i;
if(signal(SIGTERM,&sigcatcher)==-1)
{
printf("Couldn't register signal hanlder!\n");
exit(1);
}
printf("Pid of This Process:%d\n",getpid());
printf("Please input:\n");
for(;;)
{
fgets(buffer1,sizeof(buffer1),stdin);
for(i=0;i<100;i++)
{
if(buffer1[i]>=97&&buffer1<=122)
buffer2[i]=buffer1[i]-32;
else
buffer2[i]=buffer1[i];
}
printf("Your input is: %s\n",buffer2);
}
exit(0);
}
void sigcatcher(int signum)
{
printf("catch signal SIGTERM.\n");
exit(0);
}