linux½ø³Ì¿ØÖÆ£execϵÁÐ
˵ÊÇexecϵͳµ÷Óã¬Êµ¼ÊÉÏÔÚLinuxÖУ¬²¢²»´æÔÚÒ»¸öexec()µÄº¯ÊýÐÎʽ£¬execÖ¸µÄÊÇÒ»×麯Êý£¬Ò»¹²ÓÐ6¸ö£¬·Ö±ðÊÇ£º
#include <unistd.h>
int execl(const char *path, const char *arg, ...);
int execlp(const char *file, const char *arg, ...);
int execle(const char *path, const char *arg, ..., char *const envp[]);
int execv(const char *path, char *const argv[]);
int execvp(const char *file, char *const argv[]);
int execve(const char *path, char *const argv[], char *const envp[]);
ÆäÖÐÖ»ÓÐexecveÊÇÕæÕýÒâÒåÉϵÄϵͳµ÷Óã¬ÆäËü¶¼ÊÇÔÚ´Ë»ù´¡ÉϾ¹ý°ü×°µÄ¿âº¯Êý¡£
execº¯Êý×åµÄ×÷ÓÃÊǸù¾ÝÖ¸¶¨µÄÎļþÃûÕÒµ½¿ÉÖ´ÐÐÎļþ£¬²¢ÓÃËüÀ´È¡´úµ÷Óýø³ÌµÄÄÚÈÝ£¬»»¾ä»°Ëµ£¬¾ÍÊÇÔÚµ÷Óýø³ÌÄÚ²¿Ö´ÐÐÒ»¸ö¿ÉÖ´ÐÐÎļþ¡£ÕâÀïµÄ¿ÉÖ´ÐÐÎļþ¼È¿ÉÒÔÊǶþ½øÖÆÎļþ£¬Ò²¿ÉÒÔÊÇÈκÎLinuxÏ¿ÉÖ´ÐеĽű¾Îļþ¡£
Óë
Ò»°ãÇé¿ö²»Í¬£¬execº¯Êý×åµÄº¯ÊýÖ´Ðгɹ¦ºó²»»á·µ»Ø£¬ÒòΪµ÷Óýø³ÌµÄʵÌ壬°üÀ¨´úÂë¶Î£¬Êý¾Ý¶ÎºÍ¶ÑÕ»µÈ¶¼ÒѾ±»ÐµÄÄÚÈÝÈ¡´ú£¬Ö»ÁôϽø³ÌIDµÈһЩ±í
ÃæÉϵÄÐÅÏ¢ÈÔ±£³ÖÔÑù£¬ÆÄÓÐЩÉñËÆ"ÈýÊ®Áù¼Æ"ÖеÄ"½ð²õÍÑ¿Ç"¡£¿´ÉÏÈ¥»¹ÊǾɵÄÇû¿Ç£¬È´ÒѾעÈëÁËеÄÁé»ê¡£Ö»Óе÷ÓÃʧ°ÜÁË£¬ËüÃDzŻ᷵»ØÒ»¸ö-1£¬´Ó
Ô³ÌÐòµÄµ÷Óõã½Ó×ÅÍùÏÂÖ´ÐС£
ÏÖÔÚÎÒÃÇÓ¦¸ÃÃ÷°×ÁË£¬LinuxÏÂÊÇÈçºÎÖ´ÐÐгÌÐòµÄ£¬Ã¿µ±Óнø³ÌÈÏΪ×Ô¼º²»ÄÜΪϵͳ
ºÍÓµ»¤×ö³öÈκι±Ï×ÁË£¬Ëû¾Í¿ÉÒÔ·¢»Ó×îºóÒ»µãÓàÈÈ£¬µ÷ÓÃÈκÎÒ»¸öexec£¬ÈÃ×Ô¼ºÒÔеÄÃæÃ²ÖØÉú£»»òÕߣ¬¸üÆÕ±éµÄÇé¿öÊÇ£¬Èç¹ûÒ»¸ö½ø³ÌÏëÖ´ÐÐÁíÒ»¸ö³ÌÐò£¬
Ëü¾Í¿ÉÒÔfork³öÒ»¸öнø³Ì£¬È»ºóµ÷ÓÃÈκÎÒ»¸öexec£¬ÕâÑù¿´ÆðÀ´¾ÍºÃÏñͨ¹ýÖ´ÐÐÓ¦ÓóÌÐò¶ø²úÉúÁËÒ»¸öнø³ÌÒ»Ñù¡£
ÊÂ
ʵÉϵڶþÖÖÇé¿ö±»Ó¦ÓõÃÈç´ËÆÕ±é£¬ÒÔÖÁÓÚLinuxרÃÅΪÆä×÷ÁËÓÅ»¯£¬ÎÒÃÇÒѾ֪µÀ£¬fork»á½«µ÷Óýø³ÌµÄËùÓÐÄÚÈÝÔ·â²»¶¯µÄ¿½±´µ½Ð²úÉúµÄ×Ó½ø³ÌÖÐ
È¥£¬ÕâЩ¿½±´µÄ¶¯×÷ºÜÏûºÄʱ¼ä£¬¶øÈç¹ûforkÍêÖ®ºóÎÒÃÇÂíÉϾ͵÷ÓÃexec£¬ÕâЩÐÁÐÁ¿à¿à¿½±´À´µÄ¶«Î÷ÓֻᱻÁ¢¿ÌĨµô£¬Õâ¿´ÆðÀ´·Ç³£²»»®Ë㣬ÓÚÊÇÈËÃÇÉè
¼ÆÁËÒ»ÖÖ"дʱ¿½±´£¨copy-on-write£©"¼¼Êõ£¬Ê¹µÃfork½áÊøºó²¢²»Á¢¿Ì¸´ÖƸ¸½ø³ÌµÄÄÚÈÝ£¬¶øÊǵ½ÁËÕæÕýʵÓõÄʱºò²Å¸´ÖÆ£¬ÕâÑùÈç¹ûÏÂÒ»Ìõ
Óï¾äÊÇexec£¬Ëü¾Í²»»á°×°××÷ÎÞÓù¦ÁË£¬Ò²¾ÍÌá¸ßÁËЧÂÊ¡£
/* exec.c */
#include <unistd.h>
main()
{
char *envp[]={"PATH=/tmp"
Ïà¹ØÎĵµ£º
£¨L2CAPÐÒé¼ò½é£¬L2CAPÔÚBlueZÖеÄʵÏÖÒÔ¼°L2CAP±à³Ì½Ó¿Ú£©
Ò»£ºL2CAPÐÒé¼ò½é£º
Logical Link Control and Adaptation Protocol(L2CAP)
Âß¼Á¬½Ó¿ØÖƺÍÊÊÅäÐÒé (L2CAP) ΪÉϲãÐÒéÌá¹©ÃæÏòÁ¬½ÓºÍÎÞÁ¬½ÓµÄÊý¾Ý·þÎñ£¬²¢Ìṩ¶àÐÒ鹦ÄܺͷָîÖØ×é²Ù×÷¡£L2CAP ³äÐíÉϲãÐÒéºÍÓ¦ÓÃÈí¼þ´«ÊäºÍ½ÓÊÕ×î´ó³¤¶ÈΪ 64K µÄ L2CAP Ê ......
1¡¢Ïà¹ØÃüÁ
ulimit –a //²é¿´µ±Ç°ÉèÖÃ
ulimit –n 2048 //¼´Éè³É2048£¬°´Êµ¼ÊÐèÒªÉèÖÃ
2¡¢Óû§»·¾³²ÎÊýÎļþÅäÖãº
ÔÚ/etc/profileÖмÓÈëÈçÏÂÄÚÈÝ£º
if
[ $SHELL
=
"
/bin/ksh
"
]; then
ulimit
-
p
16384
ulimit&nbs ......
×èÈû²Ù×÷ÊÇÖ¸£¬ÔÚÖ´ÐÐÉ豸²Ù×÷ʱ£¬Èô²»ÄÜ»ñµÃ×ÊÔ´£¬Ôò½ø³Ì¹ÒÆðÖ±µ½Âú×ã¿É²Ù×÷µÄÌõ¼þÔÙ½øÐвÙ×÷¡£·Ç×èÈû²Ù×÷µÄ½ø³ÌÔÚ²»ÄܽøÐÐÉ豸²Ù×÷ʱ£¬²¢²»¹ÒÆð¡£±»¹ÒÆðµÄ½ø³Ì½øÈësleep״̬£¬±»´Óµ÷¶ÈÆ÷µÄÔËÐжÓÁÐÒÆ×ߣ¬Ö±µ½µÈ´ýµÄÌõ¼þ±»Âú×ã¡£
¡¡¡¡ÔÚLinux
¡¡¡¡¹ØÓÚÉÏÊöÀý³Ì£¬ÎÒÃDz¹³ä˵һµã£¬Èç¹û½«Çý¶¯³ÌÐòÖеÄreadº¯Êý¸ÄΪ£º
stat ......
linuxµÄÃüÁîÏê½â
cat cd
chmod chown
cp cut
Ãû³Æ£ºcat
ʹÓÃȨÏÞ£ºËùÓÐʹÓÃÕß
ʹÓ÷½Ê½£ºcat [-abeensttuv] [--help] [--version] filename
˵Ã÷£º°Ñµµ°¸´®Á¬½Óºó´«µ½»ù±¾Êä³ö£¨Ó©Ä»»ò¼Ó > filename µ½ÁíÒ»¸öµµ°¸£©  ......
df -k
ÏÔʾËùÓзÖÇøµÄ¿ÉÓÿռäºÍÒÑÓÿռä
ÕÒµ½·ÖÇøÊ¹ÓÃÂʽ«½ü100%µÄ·ÖÇø
sudo vgdisplay
Õâ¸öÃüÁîÏÔʾµÄÊÇÓжàÉٿռ仹ûÓб»·ÖÅ䣬Èç¹ûÏÔʾvgdisplay: command not found ÔòÐèÒª°²×°lvm2, ubuntuÏ¿ÉÒÔÖ´ÐÐsudo apt-get install lvm2À´½øÐа²×°
(Free PE / Size &n ......