fork compare to exec in linux c program
pid_t pid=fork()
it has 3 situation for the return result pid
0 child
>0 parent process
<0 fork fail
fork create a new process and it parent live alse when the child process had been created
Ïà¹ØÎĵµ£º
2009 Äê 4 ÔÂ 23 ÈÕ
±¾ÎÄÖÐÎÒÃÇÕë¶Ô Linux É϶àÏ̱߳à³ÌµÄÖ÷ÒªÌØÐÔ×ܽá³ö 5 Ìõ¾Ñ飬ÓÃÒÔ¸ÄÉÆ Linux ¶àÏ̱߳à³ÌµÄϰ¹ßºÍ±ÜÃâÆäÖеĿª·¢ÏÝÚå¡£ÔÚ±¾ÎÄÖУ¬ÎÒÃÇ´©²åһЩ Windows µÄ±à³ÌÓÃÀýÓÃÒÔ¶Ô±È Linux ÌØÐÔ£¬ÒÔ¼ÓÉî¶ÁÕßÓ¡Ïó¡£
±³¾°
Linux ƽ̨ÉϵĶàÏ̳߳ÌÐò¿ª·¢Ïà¶ÔÓ¦ÆäËûƽ̨£¨±ÈÈç Windows£©µÄ¶àÏß³Ì API ÓÐһЩϸ΢ ......
Ò»¡¢ÒýÑÔ£º
±¾ÎĵµµÄÄÚÈݴ󲿷ÝÄÚÈݶ¼ÊÇ´ÓÍøÉÏÊÕ¼¯¶øÀ´£¬È»ºóÅäºÏһЩеĽØÍ¼£¨Äں˰汾£ºV2.4.19£©¡£ÔÚÿһÅäÖÃÏîºó»áÓÐÒ»¸öÑ¡ÔñÖ¸ÄϵIJ¿·Ý£¬ÓÃÀ´Ö¸µ¼´ó¼ÒÔõôÑù¸ù¾Ý×Ô¼ºµÄÇé¿öÀ´×öÏàÓ¦µÄÑ¡Ôñ£»»¹ÓÐÔÚÿһ¸ö´óÏîºÍÎĵµµÄ×îºó»áÓÐÒ»¸ö¾Ñé̸£¬ËüÊÇһЩ¸ßÊÖÃÇÔÚÓ¦¶ÔÎÊÌâºÍ´¦ÀíÌØÓÐÓ²¼þʱµÄһЩ¾Ñ飨Õâ¸ö»¹µ ......
<!--
@page { margin: 2cm }
P { margin-bottom: 0.21cm }
TD P { margin-bottom: 0cm }
A:link { so-language: zxx }
-->
µÇ½£ºssh [hostname]
ÊäÈëÃÜÂ룺*****
µÇ
½ÒÔºó¾Í¿ÉÒÔÏñ¿ØÖÆ×Ô¼ºµÄ»úÆ÷Ò»Ñù¿ØÖÆËüÁË£¬²»¹ýûÓпÉÊÓ»¯µÄ½çÃæ¡£²»¹ýÏÖÔÚ
ÎÒËùʹÓùýµÄÁ½¸ö°æ±¾Linux( ......
³ÌÐò12£ºÀàËÆjava ÀïÃæµÄswitch case
[root@localhost scripts]# cat sh12.sh
read -p "input comand:" command
case $command in
"fix")
echo "fix system"
;;
"fuck")
echo "fuck you"
;;
*)
echo "what a stupid man!ex>$0 some word"
......
ÔÚʵÏÖÇý¶¯³ÌÐòµÄmmapº¯Êýʱ£¬Òª×¢ÒâÓ³É䵨ַµÄת»»ÎÊÌ⣬¼û´úÂë¡£
¶¨ÒåÒ»¸öÉ豸½á¹¹Ì壺
struct leedriver
{
struct cdev cdev;
unsigned char mem[MEMSIZE];
};
ÕâÀïÃæÕâ¸öMEMSIZE£¬×îС¶¼ÒªÊÇ4096£¬ÒòΪÄÚ´æÓ³ÉäÊÇÒÔҳΪµ¥Î»µÄ¡£
ÔÚʵÏÖsimple_remap_mmapº¯Êýʱ£¬´úÂëÈçÏÂ
static int simple_remap_mmap(stru ......