网络编程学习笔记(SIGPIPE信号触发)

服务端代码：

#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>#define SIN_PORT 9999
#define BUFLEN 256void str_echo(int fd);void sig_child(int signo)
{pid_t pid;int stat;while ((pid = waitpid(-1, &stat, WNOHANG)) > 0) {printf("pid %d terminated\n", pid);}}int main(int argc, char **argv)
{int listenfd, connfd;pid_t child;struct sockaddr_in servaddr;char buf[BUFLEN];time_t ticks;listenfd = socket(AF_INET, SOCK_STREAM, 0);if (listenfd < 0) {printf("socket error :%s\n", strerror(errno));        return -1;}servaddr.sin_family = AF_INET;servaddr.sin_port = htons(SIN_PORT);servaddr.sin_addr.s_addr = htonl(INADDR_ANY);signal(SIGCHLD, sig_child);if (bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0) {printf("bind error:%s\n", strerror(errno));close(listenfd);return -1;}if (listen(listenfd, 3) < 0) {printf("listen error:%s\n", strerror(errno));close(listenfd);return -1;}struct sockaddr_in clientaddr;int len;for (;;) {len = sizeof(clientaddr);connfd = accept(listenfd, (struct sockaddr*)&clientaddr, &len);if (connfd < 0) {printf("accept error:%s\n", strerror(errno));close(listenfd);return -1;}if ((child = fork()) == 0) {close(listenfd);str_echo(connfd);return 0;}/*printf("connection from %s, port:%d\n", inet_ntop(AF_INET, &clientaddr.sin_addr, buf, sizeof(buf)), htons(clientaddr.sin_port));ticks = time(NULL);snprintf(buf, sizeof(buf), "%.24s\r\n", ctime(&ticks));write(connfd, buf, strlen(buf));*/close(connfd);}return 0;
}size_t readn(int fd, void *ptr, size_t n)
{char *p = ptr;size_t nleft = n;size_t nread;while (nleft > 0) {if ((nread = read(fd, p, nleft)) < 0) {if (errno == EINTR) nread = 0;else return -1;} else if (nread == 0) break;nleft -= nread;p += nread;}return n - nleft;
}size_t readline(int fd, void *ptr, size_t maxsize)
{char *p = ptr;size_t rc, n;char c;for (n = 1; n < maxsize; n++) {
again:if ((rc = read(fd, &c, 1)) == 1) {*p++ = c;if (c == '\n') break;} else if (rc == 0) {if (n == 1) return 0;else break;} else {if (errno == EINTR) goto again;return -1;}}*p = 0;return n;
}size_t writen(int fd, void *ptr, size_t n)
{char *p = ptr;size_t nleft = n,  nwriten;while (nleft > 0) {if ((nwriten = write(fd, p, nleft)) <= 0) {if (errno == EINTR) nwriten = 0;else return -1;}p += nwriten;nleft -= nwriten;}return n;
}void str_echo(int fd)
{char recvline[BUFLEN];int n;for (;;) {if ((n = readline(fd, recvline, BUFLEN)) == 0) return;printf("received buf=%s", recvline);writen(fd, recvline, n);}
}

客户端代码：

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>#define SIN_PORT 9999
#define BUF_LEN 256
#define max(a, b) ((a) > (b) ? (a) : (b))size_t readline(int fd, void *ptr, int maxsize)
{char *p = ptr;char c;int rc;int n;for (n = 1; n < maxsize; n++) {again:if ((rc = read(fd, &c, 1)) == 1) {*p++ = c;if (c == '\n') break; } else if (rc == 0) {if (n == 1) return 0;else break;}else {if (errno == EINTR) goto again;else return -1;}}*p = 0;return n;
}size_t readn(int fd, void *ptr, size_t n)
{char *p = ptr;int nleft = n;int nread;while (nleft > 0) {if ((nread = read(fd, p, nleft)) < 0) {if (errno == EINTR) nread = 0;else return -1;} else if (nread == 0) break;nleft -= nread;p += nread;}return n - nleft;
}size_t writen(int fd, void *ptr, size_t n)
{size_t nwriten;size_t nleft = n;char *p = ptr;while (nleft > 0) {if ((nwriten = write(fd, p, nleft)) <= 0) {if (errno == EINTR) nwriten = 0;else return -1;}nleft -= nwriten;p += nwriten;}return n;
}void str_cli(FILE *file, int fd)
{char recvline[BUF_LEN], sendline[BUF_LEN];int maxfdp1;/*fd_set fdset;int ret;FD_ZERO(&fdset);for(;;) {FD_SET(fileno(file), &fdset);FD_SET(fd, &fdset);maxfdp1 = max(fileno(file), fd) + 1;ret = select(maxfdp1, &fdset, NULL, NULL, NULL);   if (ret <= 0) {continue;}//printf("ret=%d\n", ret);if (FD_ISSET(fd, &fdset)) {if (readline(fd, recvline, BUF_LEN) == 0) {printf("readline error:%s\n", strerror(errno));return;}fputs(recvline, stdout);} if (FD_ISSET(fileno(file), &fdset)) {memset(sendline, 0x00, sizeof(sendline));if (fgets(sendline, BUF_LEN, file) == NULL) {printf("fgets error:%s\n", strerror(errno));return;}//printf("len=%d\n", strlen(sendline));writen(fd, sendline, strlen(sendline));}   }*/while (fgets(sendline, BUF_LEN, file) != NULL) {writen(fd, sendline, 1);sleep(1);writen(fd, sendline, strlen(sendline) - 1);if (readline(fd, recvline, BUF_LEN) == 0) {printf("readline error:%s\n", strerror(errno));return;}fputs(recvline, stdout);}
}int main(int argc, char** argv)
{struct sockaddr_in serveraddr;int sockfd;#ifndef ONLINE_JUDGE//freopen("6.4Client.c", "r", stdin);
#endifsockfd = socket(AF_INET, SOCK_STREAM, 0);if (sockfd < 0) {printf("socket error:%s\n", strerror(errno));return -1;}   serveraddr.sin_family = AF_INET;serveraddr.sin_port = htons(SIN_PORT);if (inet_pton(AF_INET, argv[1], &serveraddr.sin_addr) != 1) {printf("inet_pton error:%s\n", strerror(errno));close(sockfd);return -1;}if (connect(sockfd, (struct sockaddr*)&serveraddr, sizeof(serveraddr)) < 0) {printf("connect error:%s\n", strerror(errno));close(sockfd);return -1;}str_cli(stdin, sockfd);exit(0);}

当进程向一个接收了RST的套接口执行写操作时，会触发SIGPIPE信号，此信号的默认行为是终止进程

终止服务端子进程，在客户端输入字符串，客户端先向服务端发送一个字符，些时客户端收到RST，再向该套接口发送字符，些时会触发SIGPIPE信号

用echo $?查看程序输出结果，输出为141,SIGPIPE的信号值为13，即128 + 13

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