Linux啟動(dòng)順序和修改啟動(dòng)后執(zhí)行程序.doc

Linux啟動(dòng)順序和修改啟動(dòng)后執(zhí)行程序Linux kernel mounts the root filesystem. The kernel starts the first user process /sbin/init provided by Busybox. /sbin/init reads /etc/inittab (From the SDK: linux/embedded_rootfs/etc-files/inittab). /etc/inittab starts the shell script /sbin/rc (From the SDK: linux/embedded_rootfs/etc-files/rc). /sbin/rc mounts the kernel pseudo filesystems /proc, /dev/shm, and /dev/pts. /sbin/rc brings up the loopback network device with the IP address 127.0.0.1. /sbin/rc starts syslogd provided by Busybox. /sbin/rc starts telnetd provided by Busybox. /sbin/rc exits returning control in /sbin/init. /etc/inittab tells /sbin/init to spawn an interactive shell. The user interactive shell prompt appears. 修改rc文件即可設(shè)定linux自啟動(dòng)的程序，即啟動(dòng)linux后便會(huì)自己執(zhí)行的程序或者shell腳步 static int noinline init_post(void) free_initmem(); unlock_kernel(); mark_rodata_ro(); system_state = SYSTEM_RUNNING; numa_default_policy(); if (sys_open(const char _user *) "/dev/console", O_RDWR, 0) (void) sys_dup(0); (void) sys_dup(0); if (ramdisk_execute_command)   run_init_process(ramdisk_execute_command);  printk(KERN_WARNING "Failed to execute %sn",    ramdisk_execute_command); /*  * We try each of these until one succeeds.  *  * The Bourne shell can be used instead of init if we are  * trying to recover a really broken machine.  */ if (execute_command)   run_init_process(execute_command);  printk(KERN_WARNING "Failed to execute %s.  Attempting "     "defaults.n", execute_command); run_init_process("/sbin/init"); run_init_process("/etc/init"); run_init_process("/bin/init"); run_init_process("/bin