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"属性"構造体を使ってsysfsエントリを作成したいと思います。これを行う方法は、次のように__ATTRマクロを使用することです。__ATTRマクロはLinuxカーネルでどのように使用されますか？
static ssize_t functionCalledOnRead(struct kobject *, struct attribute *, char *);
static ssize_t functionCalledOnRead(struct kobject *, struct attribute *, char *);
static struct attribute genericSysfsAttribute = __ATTR(attr_name, S_IRUGO | S_IRUSR, functionCalledOnRead, functionCalledOnWrite);
ただし、これは機能しません。
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:15: warning: braces around scalar initializer
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:15: warning: (near initialization for 'genericSysfsAttribute.name')
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:15: error: field name not in record or union initializer
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:15: error: (near initialization for 'genericSysfsAttribute.name')
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:15: error: field name not in record or union initializer
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:15: error: (near initialization for 'genericSysfsAttribute.name')
In file included from include/linux/thread_info.h:11:0,
from include/asm-generic/preempt.h:4,
from arch/arm/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from /home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:2:
include/linux/bug.h:34:45: warning: excess elements in scalar initializer
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: warning: (near initialization for 'genericSysfsAttribute.name')
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: error: unknown field 'show' specified in initializer
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: warning: initialization makes integer from pointer without a cast
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: warning: (near initialization for 'genericSysfsAttribute.mode')
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: error: initializer element is not computable at load time
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: error: (near initialization for 'genericSysfsAttribute.mode')
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: error: unknown field 'store' specified in initializer
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: warning: excess elements in struct initializer
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
include/linux/bug.h:34:45: warning: (near initialization for 'genericSysfsAttribute')
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
^
include/linux/kernel.h:842:3: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
BUILD_BUG_ON_ZERO((perms) & 2) + \
^
include/linux/sysfs.h:102:12: note: in expansion of macro 'VERIFY_OCTAL_PERMISSIONS'
.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:49: note: in expansion of macro '__ATTR'
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.c:32:25: warning: 'genericSysfsAttribute' defined but not used [-Wunused-variable]
static struct attribute genericSysfsAttribute = __ATTR(attr_name,S_IRUGO | S_IRUSR,functionCalledOnRead,functionCalledOnWrite);
^
scripts/Makefile.build:297: recipe for target '/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.o' failed
make[2]: *** [/home/osboxes/Documents/kernel_modules/sysfsmodule/sysfsmodule.o] Error 1
Makefile:1425: recipe for target '_module_/home/osboxes/Documents/kernel_modules/sysfsmodule' failed
make[1]: *** [_module_/home/osboxes/Documents/kernel_modules/sysfsmodule] Error 2
make[1]: Leaving directory '/home/osboxes/Documents/linux-mykonos'
Makefile:7: recipe for target 'cross' failed
make: *** [cross] Error 2
私が書いたコードではなく、含まれているコードについて話しているので、これらのエラーのほとんどが何を言っているのか分かりません。しかし、最初の引数は単なる名前であり、2番目の引数は単なる数値であるため、それらに何か問題があるとは思わないので、その2つの関数の名前をどのように与えるかとは働いていない。このような関数をどのように渡しますか？