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来源: BlogBus 原始链接: http://www.blogbus.com:80/blogbus/blog/index.php?blogid=13010&pg=2&cat=1 存档链接: https://web.archive.org/web/20040822001649id_/http://www.blogbus.com:80/blogbus/blog/index.php?blogid=13010&pg=2&cat=1

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int except_value = 0; int old_value = 0; int new_value = 0; unsigned long address= 0; char cmd_string[50]; char proc_id[50]; memset(cmd_string, 0, sizeof(cmd_string)); memset(proc_id, 0 ,sizeof(proc_id)); system("clear"); printf("\t\t.............»¶Ó­Ê¹ÓÃÄÚ´æÊı¾İĞŞ¸Ä¹¤¾ß........\n"); printf("\n"); printf("\n"); printf("ÇëÊäÈëÒªĞŞ¸ÄµÄ½ø³ÌµÄ½ø³ÌidºÅ.....\n"); scanf("%s",proc_id); printf("ÊäÈëÒªĞŞ¸ÄµÄÊı¾İÄÚ´æµØÖ·(ÊäÈëµÄÊı¾İÊÇÊ®Áù½øÖƸñʽ£¬ÀıÈ磺ed80249 8)\n"); scanf("%x",&address); printf("ÊäÈëÆÚÍûµÄÊı¾İ\n"); scanf("%d",&except_value); sprintf(cmd_string, "%s%s%s","/proc/",proc_id,"/as"); procfd = open(cmd_string ,O_RDWR);//´ò¿ªÎļş/proc//as,»ñµÃÎļş¾ä±ú if(procfd < 0){ printf("´ò¿ª½ø³ÌÎļşÏµÍ³Ê§°Ü£¬´íÎóÂëΪ%d\n", errno); exit(1); } lseek(procfd,address,SEEK_SET); read(procfd, &old_value, 4); printf("¸ÃÄÚ´æµØÖ·ÉϵÄÊı¾İΪ%d\n", old_value); lseek(procfd,address,SEEK_SET); write(procfd, &except_value, 4); lseek(procfd,address,SEEK_SET); read(procfd, &new_value, 4); printf("ĞŞ¸Äºó¸ÃÄÚ´æµØÖ·ÉϵÄÊı¾İΪ%d\n", new_value); } ´úÂëºÜ¼òµ¥¡¢ÇåÎú£¬´ó¼Ò¿ÉÒÔ¸ù¾İÕâ¸ö˼·д³ö¸ü¸´ÔÓ¸üºÃÍæµÄ¶«Î÷£¬»¶Ó­´ó¼Ò¾ÍÕâ¸ö¶«Î÷ºÍÎÒ×ö½øÒ»²½½»Á÷£¡ zhxlanjuan @ 10:35 | ÔĶÁÈ«ÎÄ | ÆÀÂÛ(0) | ÒıÓÃ(Trackback0) 2004-04-18 00:40 unixÉÏ·ÀÖ¹³ÌĞòËÀËøµÄһЩÊֶΠÔÚunixÉÏ×öCµÄ¿ª·¢ÒѾ­¿ì2ÄêÁË£¬Ò»Ö±ÔÚÎÒÃDz¿ÃŵÄÒ»¸öÖ÷Òª²úÆ·ÏîÄ¿×鹤×÷£¬¸Ã²úÆ·ÔÚÊг¡ÉϾ­ÊÜÁËÒ»Äê°ëµÄ¿¼Ñ飬¿ÉÒÔ˵ÒѾ­ÊǺܳÉÊìµÄ²úÆ·ÁË£¬¸Ã²úÆ·Ôڴ󲿷ֿͻ§ÄÇÀïÒ»Ö±Îȶ¨µÄÔËĞĞ£¬Ã»ÓĞÈκÎÎÊÌ⣬¶øÔÚÉÙÊı¼¸¸ö¿Í»§ÄÇÀʱ²»Ê±µÄ³öÏÖÕû¸öϵͳµÄµõËÀ£¬¶øÇÒ¸ÃÎÊÌâûÓĞÈκιæÂÉ¿ÉÑ°£¬³ıÁËϵͳµõËÀʱºò£¬ÎÒÃǶÔÕû¸öϵͳÓÃpstack½øĞĞËùÓнø³Ì¶ÑÕ»µÄ¸ú×ټǼÍ⣬ÎÒÃÇûÓĞÈκÎÆäËüÏßË÷£¬Ã»ÓĞϵͳ±ÀÀ£Ê±ºò²úÉúµÄCORE£¬ÎÒÃÇ¿ªÊ¼Ãæ¶ÔÀ´×Ô¿Í»§Ç¿´óµÄѹÁ¦¡£¡£¡£¡£ÎÒÃǼ¸ºõ´­²»¹ıÆğÀ´£¬ÎÒÃÇÒª¸ø¿Í»§Ìá½»¹ÊÕϱ¨¸æ£¬¶øÕâĞ©¹ÊÕϱ¨¸æµÄÎÊÌⶼÊÇÕâÒ»¸öÎÊÌ⣬Õâ¸öÎÊÌ⿪ʼ³ÉΪĞüÔÚÎÒÃÇÍ·ÉϵÄÒ»°ÑÀû½£¡£ ÎÒ¿ªÊ¼±»Ö¸ÅÉÀ´½â¾öÕâ¸öÎÊÌâ¡£ÆäʵÎÒÃǺÜÔçµÄ¾Í´Ó½ø³ÌµÄ¶ÑÕ»¸ú×ÙÀïÖªµÀÕâ¸öÎÊÌâÊÇËÀËøÎÊÌ⣬µ«ÊÇ£¬ËüÊÇÔõô·¢ÉúµÄÄÇ£¬ÎÒÃǼ¸ºõÅŲéÁËÕû¸öϵͳµÄ´úÂ룬µ«ÊÇÒ»ÎŞËù»ñ¡£¡£¡£ ÔÚ½ñÄê´óÄê³õÒ»µÄʱºò£¬ÎÒÃǵÄϵͳÓÖÒ»´Î³öÏÖÁ˸ÃÎÊÌ⣬µ±½Óµ½ÎÒÃÇά»¤¹¤³ÌʦµÄµç»°µÄʱºò£¬ÎÒµÄĞÄÇé·Ç³£µÄ³ÁÖØ£¬ÎÒûÓĞ×öµ½ÎÒ×÷Ϊһ¸ö³ÌĞòÔ±Ó¦ÓеÄÖ°Ô𣬻¹ÊÇÏóÍù³£Ò»Ñù£¬³ıÁ˽ø³Ì¶ÑÕ»¸ú×ÙÍ⣬ÎÒûÓĞÈκÎÆäËüÏßË÷£¬ÎÒ»¹ÊÇÕÕÀı½ÓÊÕÓʼş£¬²é¿´ÎÒÃÇά»¤¹¤³Ìʦ·¢»ØÀ´µÄ¶ÑÕ»¸ú×ټǼ£¬¿ÉÄÜÊǹıÄê·Å¼ÙÔÚ¼ÒÀïĞİÏ¢ÁËÒ»¶Îʱ¼äµÄÔµ¹Ê£¬ÄÔ´üºÃÏñÌرğÇåĞÑ£¬Ãæ¶Ô¶ÑÕ»¸ú×ټǼ£¬½áºÏÔ´Â룬ÎÒѸËÙµÄÒâʶµ½Ôì³ÉËÀËøµÄÔ­ÒòÊǾ­µäµÄ¾ºÌ¬Ìõ¼şÎÊÌ⣬ÊÇÒ»¸ö½ø³Ì×¼±¸Í˳öµÄʱºò£¬Ëü»á»½ĞÑËüÀïÃæµÄÒ»¸öỊ̈߳¬¸ÃÏß³ÌÊ×ÏÈ»á»ñµÃÒ»¸öËø£¬½øĞкóĞø³öÀ´£¬È»ºó½âËøÍ˳ö£¬µ«ÊÇÓÉÓڸýø³ÌµÄÖ÷Ïß³ÌûÓвÉÓÃÈκη½Ê½À´µÈ´ı¸ÃÏ̵߳ÄÍ˳ö£¬¶øÊÇÖ±½Óͨ¹ıreturnµÄ·½Ê½½øĞĞÁËÍ˳ö£¬ÎÒÃÇÖªµÀ£¬µ±Ö÷Ïß³ÌÍ˳öµÄʱºò£¬²Ù×÷ϵͳ»áÖ±½ÓÖÕÖ¹¸Ã½ø³ÌÀïÃæµÄÆäËüỊ̈߳¬²»»áÁôÈκλú»áÈÃÄǸöÏß³Ì×öÍ˳ö´¦Àí¡£¶øÄǸöÏ߳̿ÉÄÜÇ¡Ç¡¸Õ¸Õ»ñµÄÁËËø£¬¶ø»¹Ã»À´µÃ¼°½âËø£¬¾Í±»¶óɱÁË£¬ÓÚÊǾÍÔì³ÉÁËÆäËü½ø³Ì»òÏß³ÌÔÙ¼ÓÕâ¸öËøµÄʱºò£¬¾Í»á±»×èÈû£¬ÏµÍ³ËÀËøÎÊÌâÒ²¾Í¸¡ÏÖÁ˳öÀ´¡£ µ±È»£¬ÎÒÖªµÀÁËÊǾºÌ¬Ìõ¼şÎÊÌâÔì³ÉÁËËÀËø£¬¾Í»áͨ¹ıpthread_joinÀ´Í¬²½µÈ´ıÄǸöÏß³ÌÍ˳ö£¬À´Ïû³ıÕâ¸ö¾ºÌ¬Ìõ¼ş£¬Ò²¾ÍÏû³ıÁËËÀËø£¬ÎÊÌâÆäʵҲ¾Í½â¾öÁË¡£µ«ÊÇ£¬ÎÒÃÇÓĞûÓĞ°ì·¨À´Ïû³ıÓÉÓÚÒ»¸öËøµÄownerûÓĞÊͷŸÃËø£¬¾ÍËÀµôÁË£¬ÆäËüÏß³ÌÔÙ¼ÓÕâ¸öËøµÄʱºò¶øÔì³ÉµÄËÀËøÎÊÌâÄÇ£¿ ¹ØÓÚÉÏÃæÕâ¸öÎÊÌ⣬ÎÒÔø¾­ÔÚchinaunixÇë½Ì¹ıºÜ¶àÈË£¬ÓеÄÈËÏëͨ¹ıÒ»¸öÍøÂçËø£¨¾ÍÊǼÓËø¡¢½âËø¶¼Òª·ÃÎÊÍøÂçÉϵÄһ̨»úÆ÷£©À´½â¾ö£¬µ«ÊÇÕâĞ©·½·¨¶¼²»³ÉÊ죬ҲºÜ¸´ÔÓ£¬Ò²ºÃÏñÓиßÊÖ¶ÔÕâ¸öÎÊÌⲻм¡£ÎÒͨ¹ıËѼ¯ºÜ¶à×ÊÁÏ·¢ÏÖ£¬Ô­À´½â¾öÕâ¸öÎÊÌâ·Ç³£µÄ¼òµ¥£¬¼òµ¥µÄ²»ÄÜÔÚ¼òµ¥ÁË¡£ ÔںܶàϵͳÉÏ£¬µ±Ò»¸öËøµÄownerûÓĞÊͷŸÃËø£¬¾ÍÍ˳öÁË£¬ÄÇôĬÈϵķ½Ê½¾ÍÊÇÆäËüÏß³ÌÔÙÈ¥¼ÓÕâ¸öËøµÄʱºò£¬¾Í»á×èÈû£¬Ôì³ÉËÀËø¡£¶øͨ¹ı²»Í¬µÄÊôĞÔ³õʼ»¯Õâ¸öËø£¬ÎÒÃÇÄܹ»¸Ä±äÕâÖÖĬÈϵķ½Ê½£º pthread_mutexattr_setprotocol(&mattr, PTHREAD_PRIO_INHERIT); 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