p12-19.c

SUN Solaris8平台下进程间通信

#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
int listenfd, connfd;
void sig_urg(int signo);
int main(int argc,char **argv)
{
    int n;
    char buff[100];
    sigset_t mask, oldmask;
    struct sigaction action;
    /* 设置sigaction结构指明信号动作. */
    action.sa_handler = sig_urg;
    sigemptyset(&action.sa_mask);
    action.sa_flags = 0;
    /* 设置SIGURG的句柄 */
    sigaction(SIGINT, action , NULL);
     /* 阻塞SIGURG中断. */
    sigemptyset(&mask);
    sigaddset(&mask, SIGURG);
    sigprocmask (SIG_BLOCK, &mask, &oldmask);
    /* 检查参数并建立侦听套接字 */
    if(argc == 2) 
        listenfd = socket_listen(NULL,argv[1],NULL);
    else if(argc == 3)
        listenfd = socket_listen(argv[1],argv[2],NULL);
    else {
        printf("Usage: a.out <host> <port#>\n");
        exit(1);
    }
    /* 接收连接 */
    connfd = accept(listenfd, NULL, NULL);
    fcntl(connfd,F_SETOWN,getpid());
    /* 放开对SIGURG的阻塞 */ 
    sigprocmask (SIG_UNBLOCK, &oldmask,NULL);

    while(1){
        if ((n = read(connfd, buff, sizeof(buff)-1)) == 0){
            printf("received EOF\n");
            exit(0);
        }
        buff[n] = 0;
        printf("read %d bytes: %s\n",n,buff);
    }
}
/* SIGURG信号处理句柄 */
void sig_urg(int signo)
{
    int n;
    char buff[100];
    printf("SIGURG received\n");
    n = recv(connfd,buff,sizeof(buff-1,MSG_OOB));
    buff[n] = 0;
    printf("read %d OOB byte: %s\n",n,buff);
}