src/stat/fstatat.c

   1 #define _BSD_SOURCE
   2 #include <sys/stat.h>
   3 #include <string.h>
   4 #include <fcntl.h>
   5 #include <errno.h>
   6 #include <stdint.h>
   7 #include <sys/sysmacros.h>
   8 #include "syscall.h"
   9 #include "kstat.h"
  10
  11 struct statx {
  12         uint32_t stx_mask;
  13         uint32_t stx_blksize;
  14         uint64_t stx_attributes;
  15         uint32_t stx_nlink;
  16         uint32_t stx_uid;
  17         uint32_t stx_gid;
  18         uint16_t stx_mode;
  19         uint16_t pad1;
  20         uint64_t stx_ino;
  21         uint64_t stx_size;
  22         uint64_t stx_blocks;
  23         uint64_t stx_attributes_mask;
  24         struct {
  25                 int64_t tv_sec;
  26                 uint32_t tv_nsec;
  27                 int32_t pad;
  28         } stx_atime, stx_btime, stx_ctime, stx_mtime;
  29         uint32_t stx_rdev_major;
  30         uint32_t stx_rdev_minor;
  31         uint32_t stx_dev_major;
  32         uint32_t stx_dev_minor;
  33         uint64_t spare[14];
  34 };
  35
  36 static int fstatat_statx(int fd, const char *restrict path, struct stat *restrict st, int flag)
  37 {
  38         struct statx stx;
  39
  40         int ret = __syscall(SYS_statx, fd, path, flag, 0x7ff, &stx);
  41         if (ret) return ret;
  42
  43         *st = (struct stat){
  44                 .st_dev = makedev(stx.stx_dev_major, stx.stx_dev_minor),
  45                 .st_ino = stx.stx_ino,
  46                 .st_mode = stx.stx_mode,
  47                 .st_nlink = stx.stx_nlink,
  48                 .st_uid = stx.stx_uid,
  49                 .st_gid = stx.stx_gid,
  50                 .st_rdev = makedev(stx.stx_rdev_major, stx.stx_rdev_minor),
  51                 .st_size = stx.stx_size,
  52                 .st_blksize = stx.stx_blksize,
  53                 .st_blocks = stx.stx_blocks,
  54                 .st_atim.tv_sec = stx.stx_atime.tv_sec,
  55                 .st_atim.tv_nsec = stx.stx_atime.tv_nsec,
  56                 .st_mtim.tv_sec = stx.stx_mtime.tv_sec,
  57                 .st_mtim.tv_nsec = stx.stx_mtime.tv_nsec,
  58                 .st_ctim.tv_sec = stx.stx_ctime.tv_sec,
  59                 .st_ctim.tv_nsec = stx.stx_ctime.tv_nsec,
  60 #if _REDIR_TIME64
  61                 .__st_atim32.tv_sec = stx.stx_atime.tv_sec,
  62                 .__st_atim32.tv_nsec = stx.stx_atime.tv_nsec,
  63                 .__st_mtim32.tv_sec = stx.stx_mtime.tv_sec,
  64                 .__st_mtim32.tv_nsec = stx.stx_mtime.tv_nsec,
  65                 .__st_ctim32.tv_sec = stx.stx_ctime.tv_sec,
  66                 .__st_ctim32.tv_nsec = stx.stx_ctime.tv_nsec,
  67 #endif
  68         };
  69         return 0;
  70 }
  71
  72 static int fstatat_kstat(int fd, const char *restrict path, struct stat *restrict st, int flag)
  73 {
  74         int ret;
  75         struct kstat kst;
  76
  77         if (flag==AT_EMPTY_PATH && fd>=0 && !*path) {
  78                 ret = __syscall(SYS_fstat, fd, &kst);
  79                 if (ret==-EBADF && __syscall(SYS_fcntl, fd, F_GETFD)>=0) {
  80                         ret = __syscall(SYS_fstatat, fd, path, &kst, flag);
  81                         if (ret==-EINVAL) {
  82                                 char buf[15+3*sizeof(int)];
  83                                 __procfdname(buf, fd);
  84 #ifdef SYS_stat
  85                                 ret = __syscall(SYS_stat, buf, &kst);
  86 #else
  87                                 ret = __syscall(SYS_fstatat, AT_FDCWD, buf, &kst, 0);
  88 #endif
  89                         }
  90                 }
  91         }
  92 #ifdef SYS_lstat
  93         else if ((fd == AT_FDCWD || *path=='/') && flag==AT_SYMLINK_NOFOLLOW)
  94                 ret = __syscall(SYS_lstat, path, &kst);
  95 #endif
  96 #ifdef SYS_stat
  97         else if ((fd == AT_FDCWD || *path=='/') && !flag)
  98                 ret = __syscall(SYS_stat, path, &kst);
  99 #endif
 100         else ret = __syscall(SYS_fstatat, fd, path, &kst, flag);
 101
 102         if (ret) return ret;
 103
 104         *st = (struct stat){
 105                 .st_dev = kst.st_dev,
 106                 .st_ino = kst.st_ino,
 107                 .st_mode = kst.st_mode,
 108                 .st_nlink = kst.st_nlink,
 109                 .st_uid = kst.st_uid,
 110                 .st_gid = kst.st_gid,
 111                 .st_rdev = kst.st_rdev,
 112                 .st_size = kst.st_size,
 113                 .st_blksize = kst.st_blksize,
 114                 .st_blocks = kst.st_blocks,
 115                 .st_atim.tv_sec = kst.st_atime_sec,
 116                 .st_atim.tv_nsec = kst.st_atime_nsec,
 117                 .st_mtim.tv_sec = kst.st_mtime_sec,
 118                 .st_mtim.tv_nsec = kst.st_mtime_nsec,
 119                 .st_ctim.tv_sec = kst.st_ctime_sec,
 120                 .st_ctim.tv_nsec = kst.st_ctime_nsec,
 121 #if _REDIR_TIME64
 122                 .__st_atim32.tv_sec = kst.st_atime_sec,
 123                 .__st_atim32.tv_nsec = kst.st_atime_nsec,
 124                 .__st_mtim32.tv_sec = kst.st_mtime_sec,
 125                 .__st_mtim32.tv_nsec = kst.st_mtime_nsec,
 126                 .__st_ctim32.tv_sec = kst.st_ctime_sec,
 127                 .__st_ctim32.tv_nsec = kst.st_ctime_nsec,
 128 #endif
 129         };
 130
 131         return 0;
 132 }
 133
 134 int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
 135 {
 136         int ret;
 137         if (sizeof((struct kstat){0}.st_atime_sec) < sizeof(time_t)) {
 138                 ret = fstatat_statx(fd, path, st, flag);
 139                 if (ret!=-ENOSYS) return __syscall_ret(ret);
 140         }
 141         ret = fstatat_kstat(fd, path, st, flag);
 142         return __syscall_ret(ret);
 143 }
 144
 145 #if !_REDIR_TIME64
 146 weak_alias(fstatat, fstatat64);
 147 #endif