信号指定处理函数
void (*signal (int signum,void (*handle)(int)))(int);设置某个信号的处理方法
int sigaction(int signum,const struct sigaction *act,struct sigaction *oldact);用于检查或改变进程在接到信号时的动作
信号集操作函数
static inline void sigaddset(sigset_t *set,int _sig);
static inline void sigdelset(sigset_t *set,int _sig);
static inline void sigismember(sigset_t *set,int _sig);
static inline void sigfindinword(unsigned long word);
static inline void sigemptyset(sigset_t *set);
static inline void sigfillset(sigset_t *set);
信号阻塞
int sigprocmask(int how,const sigset_t *set,sigset_t *oldset);
int sigpending(sigset_t *set);
int siguspend(const sigset_t *mask);
消息管理函数
int msgget(key_t,int flag);
int msgrcv(int msqid,struct msgbuf *msgp,int msgsz,long mtype,int msgflg);
int msgsnd(int msqid,struct msgbuf *msgp,int msgz,int msgflg);
int msgctl(int msgqid,int cmd,struct msqid_ds *buf);
线程操作函数
线程的创建
int pthread_create(pthread_t *thread,pthread_attr_t *attr,void *(*start_routine)(void *),void *arg);
线程取消
void pthread_testcancel(void);
void pthread_cancel(pthread_t thread);
int pthread_setcanceltype(int type,int *oldtype);
线程私有数据
int pthread_key_create(pthread_key_t *_key,void (*_destr_function)(void *_THROW);
int pthreadd_key_delete(pthread_key_t _key) _THROW;
int pthread_setspecific(pthread_key_t _key, _const void *_pointer) _THROW;
void *pthread_getspecific(pthread_key_t _key) THROW;
互斥锁
int pthread_mutex_init (pthread_mutex_t *_testrict _mutex,_const pthread_mutexattr *_restrict _mutex_attr) _THROW;
int pthread_mutex_destroy(pthread_mutex_t *_mutex) _THROW;
int pthread_mutex_trylock(pthread_mutex_t *_mutex) _THROW;
int pthread_mutex_lock(pthread_mutex_t *mutex) _THROW;
int pthread_mutex_unlock(pthread_mutex_t *_mutex) _THROW;
条件变量
int thread_cond_init(pthread_cond_t *_restrict _cond,_const pthread_condattr_t *_restrict _cond_attr) _THROW;
int pthread_cond_destroy(pthread_cond_t *_cond)
/* Offtimer.c.For auto halt. */
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#define DELAY 60/* Time of sleeping */
int main()
{
time_t now;
struct tm *p;
while(1)
{
now = time(NULL);
&n ......
本文主要介绍如何用Linux做一个功能完备的路由器，这里将主要介绍静态路由器和动态路由器的配置，但不包括IP伪装或者说公用一个IP地址访问外面网络等问题。其已经不属于本主题讨论的范围，请参考其他如防火墙的配置等的内容。
LRP(Linux Router Project)已经成立了有好几年的时间了。这个计划的目的是利用Linux操作系统将� ......
