gdb调试技巧 32位和64位
apple:socket apple$ gcc test64.c
apple:socket apple$ ./a.out
__x86_64__apple:socket apple$
apple:socket apple$ gcc -m32 test64.c
apple:socket apple$ ./a.out
__i386__apple:socket apple$
代码如下

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/socket.h>#include <netinet/in.h>#define MAXLINE 80#define SERV_PORT 8000int main(int argc, char *argv[]){struct sockaddr_in servaddr;char buf[MAXLINE];int sockfd, n;char *str;    if (argc != 2) {fputs("usage: ./client message\n", stderr);exit(1);}str = argv[1];    sockfd = socket(AF_INET, SOCK_STREAM, 0);bzero(&servaddr, sizeof(servaddr));servaddr.sin_family = AF_INET;inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr);servaddr.sin_port = htons(SERV_PORT);    connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));write(sockfd, str, strlen(str));n = read(sockfd, buf, MAXLINE);printf("Response from server:\n");write(STDOUT_FILENO, buf, n);close(sockfd);return 0;}

查找问题的时候参考这个链接http://jimmyleeee.blog.163.com/blog/static/930961820103822435873/