strace跟踪系统调用

/*
 * strace跟踪系统调用
 * gcc strace_test.c -o strace_test
 * ./strace_test
 * ps ax | grep strace_test
 * 4338 pts/0    S+     0:00 ./strace_test
 * strace -p 4338
 */
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>

int main()
{
	char buf[1024];
	int cnt,i;
	cnt=read(STDIN_FILENO,buf,1024);
	for(i=0;i<cnt;++i)putchar(buf[i]);
	putchar('\n');
	return 0;
}