編譯 scull
出現(xiàn)以下錯(cuò)誤
Fix it to use ccflags-y. Stop.
將 Makefile 中的 CFLAGS 改為 ccflags-y， 重新 make，又出現(xiàn)錯(cuò)誤
main.c:15:26: fatal error: linux/config.h: No such file or directory
將 main.c 中的 #include <linux/config.h> 刪除或注釋掉，重新 make，繼續(xù)編譯會(huì)遇到如下問(wèn)題
main.c:634:2: error: unknown field 'ioctl' specified in initializer
是因?yàn)閮?nèi)核中的 file_operations 結(jié)構(gòu)發(fā)生了改變，將 main.c 中 scull_fops 聲明處的 .ioctl 改為 .unlocked_ioctl 即可，繼續(xù)編譯還會(huì)遇到如下問(wèn)題
main.c:652:3: error: implicit declaration of function ‘init_MUTEX’ [-Werror=implicit-function-declaration]
可在 main.c 的開始處添加以下代碼解決問(wèn)題
#include <linux/semaphore.h>
#define init_MUTEX(a) sema_init(a,1)
#define init_MUTEX_LOCKED(a) sema_init(a,0)
到這時(shí)還沒(méi)完，我開始有點(diǎn)煩燥了...繼續(xù)前進(jìn)時(shí)還出現(xiàn)以下錯(cuò)誤
pipe.c: In function ‘scull_p_read’:
pipe.c:131:7: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
pipe.c:131:7: note: each undeclared identifier is reported only once for each function it appears in
pipe.c:131:3: error: implicit declaration of function ‘signal_pending’ [-Werror=implicit-function-declaration]
pipe.c:131:3: error: implicit declaration of function ‘schedule’ [-Werror=implicit-function-declaration]
該問(wèn)題可向 pipe.c 和 access.c 中添加
#include <linux/sched.h> 來(lái)解決，但后面還會(huì)遇到這樣的問(wèn)題
access.c:101:34: error: ‘SPIN_LOCK_UNLOCKED’ undeclared here (not in a function)
在access.c文件中用 static DEFINE_SPINLOCK(scull_w_lock); 來(lái)代替 static spinlock_t scull_w_lock = SPIN_LOCK_UNLOCKED;
繼續(xù)進(jìn)行，遭遇下面問(wèn)題
access.c:111:29: error: ‘struct task_struct’ has no member named ‘uid’
access.c:112:29: error: ‘struct task_struct’ has no member named ‘euid’
access.c:119:26: error: ‘struct task_struct’ has no member named ‘uid’
把 access.c 文件中的
current->uid
current->euid
全部修對(duì)應(yīng)地改為
current->cred->uid
current->cred->euid
繼續(xù)重新 make，終于可以生成 scull.ko 了，OMG......
還要注意的是，上面的錯(cuò)誤可能不止發(fā)生在一個(gè)地方，編譯時(shí)需要注意看清錯(cuò)誤提示，如果有跟上面一樣的錯(cuò)誤發(fā)生，只需參照上面的方法來(lái)修改即可。
驅(qū)動(dòng)不會(huì)在虛擬終端上輸出，所以如果在終端上沒(méi)看到驅(qū)動(dòng)的輸出，可以看看是不是輸出到日志中了：/var/log/syslog
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