[英]Description Resource Path Location Type cannot open output file character.exe: Permission denied character C/C++ Problem
[英]Permission denied in character device
我正在為充當FIFO設備的debian 6內核編寫設備的驅動程序模塊,編譯顯然是正確的,我使用以下代碼創建它:
Major = register_chrdev(0, DEVICE_NAME, &fops); //Major is an integer value
if (Major < 0) {
printk(KERN_ALERT "Registering char device failed with %d\n", Major);
return -Major;
}
/*
* Creation of buffer;
*/
if( (buf = create_cbuffer_t(MAX_BUFFER_SIZE)) == NULL){
printk(KERN_ALERT "Error when creating the FIFO device.");
return -EINVAL;
}
printk(KERN_INFO "Buffer created without error.\n");
指定的主要電話號碼是251,我使用以下文件創建了文件:
sudo mknod /dev/fifodev c 251 0
它正常工作,但是當我嘗試在終端中訪問時,這就是結果
dsouser@debian:~/Escritorio/Prac3/ParteB$ echo whatever > /dev/fifodev
bash: /dev/fifodev: Permiso denegado **This means:Permission denied**
這也發生了:
dsouser@debian:~/Escritorio/Prac3/ParteB$ cat /dev/fifodev
cat: /dev/fifodev: Argumento inválido
里面有什么問題或使其正確運行的方式是什么?
非常感謝
更改/dev/fifodev
的權限
sudo chmod 666 /dev/fifodev
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