| #include <sys/ioctl.h> |
| #include <stdarg.h> |
| #include <errno.h> |
| #include <time.h> |
| #include <sys/time.h> |
| #include <stddef.h> |
| #include <string.h> |
| #include "syscall.h" |
| |
| #define alignof(t) offsetof(struct { char c; t x; }, x) |
| |
| #define W 1 |
| #define R 2 |
| #define WR 3 |
| |
| struct ioctl_compat_map { |
| int new_req, old_req, old_size; |
| char dir, force_align; |
| int offsets[4]; |
| }; |
| |
| static const struct ioctl_compat_map compat_map[] = { |
| { SIOCGSTAMP, SIOCGSTAMP_OLD, 8, R, 0, { 0, -1, -1, -1 } }, |
| { SIOCGSTAMPNS, SIOCGSTAMPNS_OLD, 8, R, 0, { 0, -1, -1, -1 } }, |
| }; |
| |
| static void convert_ioctl_struct(const struct ioctl_compat_map *map, char *old, char *new, int dir) |
| { |
| int new_offset = 0; |
| int old_offset = 0; |
| int old_size = map->old_size; |
| if (!(dir & map->dir)) return; |
| for (int i=0; i < sizeof map->offsets / sizeof *map->offsets; i++) { |
| int ts_offset = map->offsets[i]; |
| if (ts_offset < 0) break; |
| int len = ts_offset-old_offset; |
| if (dir==W) memcpy(old+old_offset, new+new_offset, len); |
| else memcpy(new+new_offset, old+old_offset, len); |
| new_offset += len; |
| old_offset += len; |
| long long new_ts[2]; |
| long old_ts[2]; |
| int align = map->force_align ? sizeof(time_t) : alignof(time_t); |
| new_offset += (align-1) & -new_offset; |
| if (dir==W) { |
| memcpy(new_ts, new+new_offset, sizeof new_ts); |
| old_ts[0] = new_ts[0]; |
| old_ts[1] = new_ts[1]; |
| memcpy(old+old_offset, old_ts, sizeof old_ts); |
| } else { |
| memcpy(old_ts, old+old_offset, sizeof old_ts); |
| new_ts[0] = old_ts[0]; |
| new_ts[1] = old_ts[1]; |
| memcpy(new+new_offset, new_ts, sizeof new_ts); |
| } |
| new_offset += sizeof new_ts; |
| old_offset += sizeof old_ts; |
| } |
| if (dir==W) memcpy(old+old_offset, new+new_offset, old_size-old_offset); |
| else memcpy(new+new_offset, old+old_offset, old_size-old_offset); |
| } |
| |
| int ioctl(int fd, int req, ...) |
| { |
| void *arg; |
| va_list ap; |
| va_start(ap, req); |
| arg = va_arg(ap, void *); |
| va_end(ap); |
| int r = __syscall(SYS_ioctl, fd, req, arg); |
| if (r==-ENOTTY) { |
| for (int i=0; i<sizeof compat_map/sizeof *compat_map; i++) { |
| if (compat_map[i].new_req != req) continue; |
| union { |
| long long align; |
| char buf[256]; |
| } u; |
| convert_ioctl_struct(&compat_map[i], u.buf, arg, W); |
| r = __syscall(SYS_ioctl, fd, compat_map[i].old_req, u.buf); |
| if (r<0) break; |
| convert_ioctl_struct(&compat_map[i], u.buf, arg, R); |
| } |
| } |
| return __syscall_ret(r); |
| } |