Linux 併發伺服器程式設計（多程序）

在linux中通過流式套接字程式設計（tcp），實現乙個併發伺服器的訪問回顯，適合剛學完linux套接字程式設計的朋友進行鞏固訓練

具體功能：

#include

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define server_addr "172.17.44.154"
#define bufsize 100
void
sigchld_handler
(int arg)
;int
main
(int argc,
const
char
*ar**)
/* 繫結位址 */
server_addr.sin_family = af_inet;
server_addr.sin_port =
htons
(5001);
inet_pton
(af_inet, server_addr,
(void*)
&server_addr.sin_addr.s_addr)
;//位址轉換if(
-1==bind
(socket_fd,
(struct sockaddr*
)&server_addr,
sizeof
(server_addr)))
/* 轉換為被動連線套接字 */if(
-1==listen
(socket_fd,5)
)#if 0 
//單程序伺服器
/* 獲取已連線套接字 */
socklen_t len =0;
new_fd =
accept
(socket_fd,
(struct sockaddr*
)&cli_addr,
(socklen_t *
)&len);if
(-1== new_fd)
printf
("accept socket!\nclient ip :%s port:%d\n"
,inet_ntoa
(cli_addr.sin_addr)
, cli_addr.sin_port)
;while(1
)printf
("read:%s\n"
, buf)
;send
(new_fd, buf, bufsize,0)
;//回應客戶端
}close
(new_fd)
;#else
//多程序併發伺服器
while(1
)/* 併發伺服器：子程序中進行tcp通訊 */
pid =
fork()
;if(pid ==-1
)else
if(pid ==0)
getsockname
(new_fd,
(struct sockaddr*
)&cli_addr,
(socklen_t *
)&len)
;//獲取連線套接字資訊
printf
("recv client ip:%s data:%s\n"
,inet_ntoa((
struct in_addr)cli_addr.sin_addr)
, buf)
;send
(new_fd, buf, bufsize,0)
;//回應客戶端}}
else
}#endif
close
(socket_fd)
;return0;
}void
sigchld_handler
(int arg)
printf
("a client %d is end\n"
, child_pid);}
}

#include

#include
#include
#include
#include
#include
#include
#include
#include
#include
#define server_addr "172.17.44.154"
#define bufsize 100
intmain
(int argc,
const
char
*ar**)
server_addr.sin_family = af_inet;
server_addr.sin_port =
htons
(5001);
inet_pton
(af_inet, server_addr,
(void*)
&server_addr.sin_addr.s_addr);if
(-1==
connect
(new_fd,
(struct sockaddr*
)&server_addr,
sizeof
(server_addr)))
while(1
)if(0
==recv
(new_fd, buf, bufsize,0)
)printf
("recv:%s\n"
, buf);}
close
(new_fd)
;return0;
}

正常執行的狀態如下：

當有乙個客戶端退出時，伺服器會顯示資訊，但是對其他客戶端的服務正常進行：

當伺服器主動關閉之後，所有客戶端都會收到伺服器關閉的資訊，並且主動退出：

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