Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

linux¹²ÏíÄÚ´æʹÓÃʵÀý

Èý¸öÎļþ£¬Ò»¸öÍ·Îļþ£¬Ò»¸ö¶Á£¬Ò»¸öд£¬ÓÃͬһ¸ökeyÖµÉêÇë¹²ÏíÄÚ´æ¡£
//shm.h
#ifndef _SHM_COM_H
#define _SHM_COM_H 1
#define TEXT_SZ 2048
struct shared_use_at
{
    int written_by_you;
    char some_text[TEXT_SZ];
};
struct kts
{
 int power;
 int mode;
 int temp;
 int windspeed;
 int write_flag;
};
#endif
//shm_write.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include "shm.h"
int main()
{
 int running = 1;
 void *shared_memory = (void *)0;
 struct shared_use_at *shared_stuff;
 char buffer[BUFSIZ];
 int shmid;
    shmid = shmget((key_t)1234, sizeof(struct shared_use_at), 0666 | IPC_CREAT);
    if(shmid == -1)
    {
 fprintf(stderr, "shmget failed\n");
 exit(EXIT_FAILURE);
    }
    shared_memory = shmat(shmid, (void *)0, 0);
    if(shared_memory == (void *)-1)
    {
        fprintf(stderr, "shmat failed\n");
        exit(EXIT_FAILURE);
    }
    printf("Memory attached at %X\n", (int)shared_memory);
    shared_stuff = (struct shared_use_at *)shared_memory;
    while(running)
    {
        while(shared_stuff->written_by_you == 1)
        {
            sleep(1);
            printf("waiting for client...\n");
        }
        printf("Enter some text: ");
      &n


Ïà¹ØÎĵµ£º

LinuxÏÂMysql ÃüÁîÐÐÏÔʾÂÒÂëÎÊÌâ½â¾ö

ÔÚʹÓÃWindowsÃüÁîÐвÙ×÷MySQLÊý¾Ý¿âµÄʱºò£¬ÒÔutf8¸ñʽ´æ´¢ÔÚMySQLÊý¾Ý¿âÖеÄÊý¾Ý£¬´ÓÃüÁîÐжÁÈ¡³öÀ´×ÜÊÇÂÒÂ룬ÏÔʾȫÊÇÎʺš£»òÕß´ÓÃüÁîÐвåÈëÐÂÊý¾Ý£¬½á¹ûÏà·´£¬ÔÚÃüÁîÐÐÖÐÏÔʾÊÇÕý³£µÄ£¬µ«ÊÇÔÚPHPMyAdminÖÐÈ´ÊÇÂÒÂë¡£
¡¡¡¡¾­¹ýÉÏÍø²éÕÒÑо¿£¬·¢ÏÖmysqlµÄÃüÁîÐпͻ§¶Ë¸ù±¾ÎÞ·¨ÒÔutf-8µÄÐÎʽ·µ»ØÊý¾Ý£¬½â¾öÈçÏ¡£
¡¡¡¡² ......

µÚ1 ²¿·Ö£ºLinux »ù´¡

ÔÚ±¾½Ì³ÌÖУ¬ÎÒÃǽ«¸øÄú½éÉÜ bash£¨±ê×¼µÄ Linux shell£©£¬ÎªÄúչʾÈçºÎ³ä·ÖÀûÓÃÈç ls¡¢cp ºÍ mv ÕâÑùµÄ±ê×¼ Linux ÃüÁ²¢ÏòÄú½²½â Linux µÄȨÏÞºÍËùÓÐȨģÐÍÒÔ¼°¸ü·á¸»µÄÄÚÈÝ¡£ÔÚ±¾½Ì³Ì½áÊøÖ®¼Ê£¬Äú½«¾ßÓÐ Linux »ù´¡ÖªÊ¶·½ÃæµÄÔúʵ»ù´¡£¬ÉõÖÁ»¹¿ÉÒÔ×¼±¸¿ªÊ¼Ñ§Ï°Ò»Ð©»ù±¾µÄ Linux ϵͳ¹ÜÀíÈÎÎñ·½ÃæµÄ֪ʶ¡£
Ò»¡£¹ØÓÚ±¾½ ......

LinuxϵĶàÏ̱߳à³Ì

1 ÒýÑÔ
¡¡¡¡Ị̈߳¨thread£©¼¼ÊõÔçÔÚ60Äê´ú¾Í±»Ìá³ö£¬µ«ÕæÕýÓ¦ÓöàÏ̵߳½²Ù×÷ϵͳÖÐÈ¥£¬ÊÇÔÚ80Äê´úÖÐÆÚ£¬solarisÊÇÕâ·½ÃæµÄٮٮÕß¡£´«Í³µÄUnixÒ²Ö§³ÖÏ̵߳ĸÅÄµ«ÊÇÔÚÒ»¸ö½ø³Ì£¨process£©ÖÐÖ»ÔÊÐíÓÐÒ»¸öỊ̈߳¬ÕâÑù¶àÏ߳̾ÍÒâζ×Ŷà½ø³Ì¡£ÏÖÔÚ£¬¶àÏ̼߳¼ÊõÒѾ­±»Ðí¶à²Ù×÷ϵͳËùÖ§³Ö£¬°üÀ¨Windows/NT£¬µ±È»£¬Ò²°üÀ¨Linux¡£ ......

Linux AIO

LinuxµÄI/O»úÖƾ­ÀúÁËһϼ¸¸ö½×¶ÎµÄÑݽø£º
1. ͬ²½×èÈûI/O: Óû§½ø³Ì½øÐÐI/O²Ù×÷£¬Ò»Ö±×èÈûµ½I/O²Ù×÷Íê³ÉΪֹ¡£
2. ͬ²½·Ç×èÈûI/O: Óû§³ÌÐò¿ÉÒÔͨ¹ýÉèÖÃÎļþÃèÊö·ûµÄÊôÐÔO_NONBLOCK£¬I/O²Ù×÷¿ÉÒÔÁ¢¼´·µ»Ø£¬µ«ÊDz¢²»±£Ö¤I/O²Ù×÷³É¹¦¡£
3. Ò첽ʼþ×èÈûI/O: Óû§½ø³Ì¿ÉÒÔ¶ÔI/Oʼþ½øÐÐ×èÈû£¬µ«ÊÇI/O²Ù×÷²¢²»×èÈû¡£Í¨¹ýse ......

redhat linuxÃüÁî´óÈ«


Ò». Æô¶¯,¹Ø»ú,µÇÈë,µÇ³öÏà¹ØÃüÁî
<login> 怬
<logout> µÇ³ö
<exit> µÇ³ö
<shutdown> ֹͣϵͳ
<halt> ֹͣϵͳ
<reboot> ÖØÆô¶¯
<poweroff> ÇжϵçÔ´
<sync> °ÑÄÚ´æÀïµÄÄÚÈÝдÈë´ÅÅÌ
<lilo> °²×°liloÆô¶¯¹ÜÀí³ÌÐò
<grub> °²×°liloÆô¶¯¹ÜÀí³ÌÐò ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ