p12-3.c

来自「SUN Solaris8平台下进程间通信」· C语言 代码 · 共 35 行

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
int main(void)
{
    int    stayopen = 1;
    struct servent *sp;
    /* 打开服务数据库，准备开始扫描 */
    setservent(stayopen);
    /* 逐项扫描登记项 */
    while (1) {
        sp = getservent();
        if (sp != (struct servent *)0) {
           printf( "sp->s_name=%s,", sp->s_name);
           printf( "sp->s_port=%d, ", ntohs(sp->s_port));
           printf( "sp->s_proto=%s\n", sp->s_proto);
        }
        else
           break;
    }
    /* 关闭服务数据库 */
    endservent();
    /* 专门查看telnet服务的端口号*/
    sp = getservbyname("telnet", "tcp");
    if (sp != (struct servent *)0) 
        printf( "telnet's port is %d\n", ntohs(sp->s_port));
    else
        printf("ERROR: getservbyname call failed\n");
    return 0;
}