#include <sys/types.h>
#include <sys/xattr.h>
ssize_t getxattr(const char *path, const char *name,
void *value, size_t size);
ssize_t lgetxattr(const char *path, const char *name,
void *value, size_t size);
ssize_t fgetxattr(int fd, const char *name,
void *value, size_t size);
getxattr() retrieves the value of the extended attribute identified by name and associated with the given path in the filesystem. The attribute value is placed in the buffer pointed to by value; size specifies the size of that buffer. The return value of the call is the number of bytes placed in value.
lgetxattr() は getxattr() と同じだが、シンボリックリンクの場合に、リンクが参照しているファイル ではなく、リンクそのものの情報を取得する点だけが異なる。
fgetxattr() は getxattr() と同じだが、 path の代わりに fd で参照されたオープン済みファイルの情報だけを取得する点が異なる (fd は open(2) によって返される)。
An extended attribute name is a null-terminated string. The name includes a namespace prefix; there may be several, disjoint namespaces associated with an individual inode. The value of an extended attribute is a chunk of arbitrary textual or binary data that was assigned using setxattr(2).
If size is specified as zero, these calls return the current size of the named extended attribute (and leave value unchanged). This can be used to determine the size of the buffer that should be supplied in a subsequent call. (But, bear in mind that there is a possibility that the attribute value may change between the two calls, so that it is still necessary to check the return status from the second call.)
上記に加えて、 stat(2) に書かれているエラーが発生する場合もある。
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