Af_unix domain communication (socket and pipe based communication, only suitable for UNIX system s&c on one host for process communication)

Server-side:

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stddef.h>
Char buf[100];
void Main (void)
{int sersock,cltsock;
int Len,clen;
int ret=0;
struct Sockaddr_un seraddr,cltaddr;
Sersock=socket (af_unix,sock_stream,0);
if (sersock<0) {return;}
memset (&seraddr,0,sizeof (SERADDR));
Seraddr.sun_family=af_unix;
sprintf (Seraddr.sun_path, "Ser");
Unlink (Seraddr.sun_path);
Len = offsetof (struct Sockaddr_un, Sun_path) + strlen (Seraddr.sun_path);
if (0 > Bind (sersock, (struct sockaddr *) &seraddr, sizeof (struct sockaddr)) | | //
0 > Listen (sersock, 10))
{printf ("fail to bind and Lisen \ n");}
printf ("Start to listen connect request from UNIX socket name: \"%s\ "\ n", Seraddr.sun_path);
while (1)
{clen=sizeof (CLTADDR);
Cltsock=accept (Sersock, (struct sockaddr*) &cltaddr,&clen);
if (0>cltsock)
{printf ("ACCEPT error\n");}
Clen-= offsetof (struct sockaddr_un, sun_path);
Cltaddr.sun_path[clen] = 0;
while (1)
{
ret = recv (cltsock,buf,100, 0);
buf[ret]=0;
printf (BUF);
if (ret! = Send (Cltsock, Buf,ret, 0))
{printf ("Agentsrv Send Message Fail\n");}
}
}
Close (Cltsock);
Close (Sersock);
}

Client:

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stddef.h>
Char buf[100];
void Main (void)
{
int Cltsock, Len, err;
struct Sockaddr_un cltaddr;
struct Sockaddr_un seraddr;
int ret;
Cltsock = socket (Af_unix, sock_stream, 0);
if (Cltsock < 0)
{
printf ("Socket creat error!!! \ n ");
Return
}
memset (&cltaddr, 0, sizeof (CLTADDR));
cltaddr.sun_family = Af_unix;
sprintf (Cltaddr.sun_path, "CLT");
Len = offsetof (struct Sockaddr_un, Sun_path) + strlen (Cltaddr.sun_path);
Unlink (Cltaddr.sun_path); If it already exists, delete it first
if (Bind (Cltsock, (struct sockaddr *) &cltaddr, sizeof (struct sockaddr)) < 0)//bind to create file path strength
{
printf ("Bind socket to addr fail\n");
Close (Cltsock);
Return
}

/* IF (chmod (Cltaddr.sun_path, S_irwxu) < 0)//Modify file permissions: Can not be required
{
printf ("Set%s rwx for user only fail\n", Cltaddr.sun_path);
Return
}
*/
Set the server-side address
memset ((char*) &seraddr, 0, sizeof (SERADDR));
seraddr.sun_family = Af_unix;
strcpy (Seraddr.sun_path, "Ser");
Len = offsetof (struct Sockaddr_un, Sun_path) + strlen ("Ser");
Connect the server end address with the client socket
if (Connect (cltsock, (struct sockaddr *) &seraddr, Len) < 0)
{
printf ("Connect Agent sock \"%s\ "fail\n", "Ser");
Return
}
while (1)
{printf ("Input a Line:");
Gets (BUF);
Len=strlen (BUF);
printf ("\nsend cnt:%d\n", Len);
if (len! = Send (Cltsock, buf, Len, 0))
{
printf ("Send msg fail\n");
return;
}
ret = recv (cltsock,buf,100, 0);
buf[ret]=0;
printf ("\nreceived:%s\n", buf);
}
Close (Cltsock);
}

This article from "Tech record" blog, declined reprint!

Af_unix domain communication (socket and pipe based communication, only suitable for UNIX system s&c on one host for process communication)