GustavoARSilva
commented
3 years ago Apparently, the one-element arrays in include/uapi/linux/videodev2.h are merely placeholders for alignment, and are not being used as variable-length arrays:
950 struct v4l2_requestbuffers {
951 __u32 count;
952 __u32 type; /* enum v4l2_buf_type */
953 __u32 memory; /* enum v4l2_memory */
954 __u32 capabilities;
955 __u32 reserved[1];
956 };
1722 struct v4l2_ext_control {
1723 __u32 id;
1724 __u32 size;
1725 __u32 reserved2[1];
1726 union {
1727 __s32 value;
1728 __s64 value64;
1729 char __user *string;
1730 __u8 __user *p_u8;
1731 __u16 __user *p_u16;
1732 __u32 __user *p_u32;
1733 struct v4l2_area __user *p_area;
1734 void __user *ptr;
1735 };
1736 } __attribute__ ((packed));
1738 struct v4l2_ext_controls {
1739 union {
1740 #ifndef __KERNEL__
1741 __u32 ctrl_class;
1742 #endif
1743 __u32 which;
1744 };
1745 __u32 count;
1746 __u32 error_idx;
1747 __s32 request_fd;
1748 __u32 reserved[1];
1749 struct v4l2_ext_control *controls;
1750 };
kees
There are currently 7 files containing one-element arrays in UAPI: