Linux启动顺序和修改启动后执行程序

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1、Linux启动顺序和修改启动后执行程序Linuxkernelmountstherootfilesystem.Thekernelstartsthefirstuserprocess/sbin/initprovidedbyBusybox./sbin/initreads/etc/inittab(FromtheSDK:linux/embedded_rootfs/etc-files/inittab)./etc/inittabstartstheshellscript/sbin/rc(FromtheSDK:linux/embedded_rootfs/etc-files/rc)./sbin/rcm

2、ountsthekernelpseudofilesystems/proc,/dev/shm,and/dev/pts./sbin/rcbringsuptheloopbacknetworkdevicewiththeIPaddress127.0.0.1./sbin/rcstartssyslogdprovidedbyBusybox./sbin/rcstartstelnetdprovidedbyBusybox./sbin/rcexitsreturningcontrolin/sbin/init./etc/inittabtells/sbin/inittospawnaninteractivesh

3、ell.Theuserinteractiveshellpromptappears.修改rc文件即可设定linux自启动的程序，即启动linux后便会自己执行的程序或者shell脚步staticintnoinlineinit_post(void){free_initmem();unlock_kernel();mark_rodata_ro();system_state=SYSTEM_RUNNING;numa_default_policy();if(sys_open((constchar__user*)"/dev/console",O_RDWR,0)(void)sy

4、s_dup(0);(void)sys_dup(0);if(ramdisk_execute_command){  run_init_process(ramdisk_execute_command);  printk(KERN_WARNING"Failedtoexecute%s",  ramdisk_execute_command);}/*  *Wetryeachoftheseuntilonesucceeds.  *  *TheBournes

5、hellcanbeusedinsteadofinitifweare  *tryingtorecoverareallybrokenmachine.  */if(execute_command){  run_init_process(execute_command);  printk(KERN_WARNING"Failedtoexecute%s.  Attempting"    "defaults..."

6、;,execute_command);}run_init_process("/sbin/init");run_init_process("/etc/init");run_init_process("/bin/init");run_init_process("/bin/sh");panic("Noinitfound.  Trypassinginit=optiontokernel.");