173 lines
3.3 KiB
C
173 lines
3.3 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <pthread.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <netdb.h>
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#include <sys/mman.h>
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#include <limits.h>
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/*
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In an attempt to situate a stack frame over a 4GB boundary, we
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first create a memory region which spans that boundary. The
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boundary which we are trying to span is arbitrarily chosen,
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just make sure does not intersect with a region already in use.
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*/
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#define TARGET_BOUNDARY 0x3f600000000
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#define MEM_REGION_SIZE 0x200000
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#define MEM_REGION_START (TARGET_BOUNDARY - (MEM_REGION_SIZE/2))
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#define KLUDGE_SPACE (-0x6e68)
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int proto_tcp;
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int port;
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void *receiver(void *);
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void *sender(void *);
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main(argc,argv)
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int argc;
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char *argv[];
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{
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pthread_t server;
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pthread_t client;
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struct protoent *pe;
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void *stack_region;
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int ret;
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void *stack_addr=(void *)(TARGET_BOUNDARY+KLUDGE_SPACE);
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size_t stack_size = 2 * PTHREAD_STACK_MIN;
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pthread_attr_t attr;
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/* set TCP port and protocol number */
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if (argc != 2 ) port=1027;
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else port = atoi(argv[1]);
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pe = getprotobyname("tcp");
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proto_tcp=pe->p_proto;
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if (pthread_attr_init(&attr) < 0) {
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perror("pthread_attr_init\n");
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exit(1);
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}
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/* creating the memory region */
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stack_region=mmap((void *)MEM_REGION_START,
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MEM_REGION_SIZE, PROT_READ|PROT_WRITE,
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MAP_PRIVATE | MAP_ANON, (-1), 0);
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if (stack_region == MAP_FAILED) {
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perror("mmap\n");
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exit(1);
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}
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if (pthread_create(&server, NULL , sender, NULL) != 0){
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perror("pthread_create 1");
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exit(1);
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}
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if ((ret=pthread_attr_setstack(&attr,stack_addr,stack_size))!=0)
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{
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perror("pthread_attr_setstack");
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printf("ret = %d\n",ret);
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exit(1);
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}
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if ((ret=pthread_create(&client, &attr, receiver, NULL)) != 0){
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printf("pthread_create2 failed with %d\n",ret);
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exit(1);
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}
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pthread_join(server, NULL);
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pthread_join(client, NULL);
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exit(0);
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}
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void *sender(void *context){
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int ret;
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int sfd; /* socket descriptor */
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int cfd; /* connection descriptor */
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struct sockaddr_in addr;
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char *p;
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char buffer[] = "Hello World!";
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if ((sfd = socket(PF_INET, SOCK_STREAM, proto_tcp)) < 0 ) {
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perror("sender socket\n");
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return(NULL);
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}
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addr.sin_family=AF_INET;
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addr.sin_port=htons(port);
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p=(gethostbyname("localhost")->h_addr_list[0]);
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memcpy(&(addr.sin_addr.s_addr),p,sizeof(p));
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if (bind(sfd, (struct sockaddr*)&addr, sizeof addr) < 0) {
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perror("sender bind\n");
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return(NULL);
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}
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if (listen(sfd, 1) == -1){
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perror("sender listen\n");
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return(NULL);
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}
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cfd = accept(sfd, NULL, NULL);
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if (cfd < 0 )
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{
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perror("accept\n");
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return(NULL);
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}
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if(send(cfd, (void*) buffer, sizeof(buffer), MSG_NOSIGNAL) == -1){
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perror("send");
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return(NULL);
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}
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shutdown(cfd, SHUT_RDWR);
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return(NULL);
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}
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void *receiver(void *context){
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char buf[100];
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int sfd;
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struct sockaddr_in addr;
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char *p;
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ssize_t ret;
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addr.sin_family=AF_INET;
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addr.sin_port=htons(port);
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p=(gethostbyname("localhost")->h_addr_list[0]);
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memcpy(&(addr.sin_addr.s_addr),p,sizeof(p));
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sleep(1);
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if ((sfd = socket(PF_INET, SOCK_STREAM, proto_tcp)) < 0 ) {
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perror("receiver socket\n");
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return(NULL);
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}
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if(connect(sfd, (struct sockaddr*)&addr, sizeof addr) == -1){
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perror("connect\n");
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return(NULL);
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}
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if ((ret = recv(sfd, (void*)buf, sizeof(buf), MSG_WAITALL))<0) {
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perror("recv");
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return(NULL);
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}
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buf[ret]='\0';
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printf("received \"%s\"\n",buf);
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shutdown(sfd, SHUT_RDWR);
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return(NULL);
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}
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