appname_to_appnum.c

聊天程序~使用LINUX c 语言实现~

/* appname_to_appnum.c  把计算机名转换成对应的二进制地址*/ 

#include <cnaiapi.h>


appnum appname_to_appnum(char *appname) {

	struct servent		*sp;
	appnum			port;

	cnaiapi_init();

#if defined(FreeBSD) || defined(LINUX)
	pthread_mutex_lock(&appname_mutex);
#endif

	sp = getservbyname(appname, "tcp");
	if (sp == NULL) {
#if defined(FreeBSD) || defined(LINUX)
		pthread_mutex_unlock(&appname_mutex);
#endif
		return -1;
	}
	
	port = ntohs(sp->s_port);
#if defined(FreeBSD) || defined(LINUX)
		pthread_mutex_unlock(&appname_mutex);
#endif
	return port;
}