nsz Git - musl/blob - 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 "syscall.h"
   7 #include "kstat.h"
   8
   9 int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
  10 {
  11         int ret;
  12         struct kstat kst;
  13
  14         if (flag==AT_EMPTY_PATH && fd>=0 && !*path) {
  15                 ret = __syscall(SYS_fstat, fd, st);
  16                 if (ret==-EBADF && __syscall(SYS_fcntl, fd, F_GETFD)>=0) {
  17                         ret = __syscall(SYS_fstatat, fd, path, st, flag);
  18                         if (ret==-EINVAL) {
  19                                 char buf[15+3*sizeof(int)];
  20                                 __procfdname(buf, fd);
  21 #ifdef SYS_stat
  22                                 ret = __syscall(SYS_stat, buf, st);
  23 #else
  24                                 ret = __syscall(SYS_fstatat, AT_FDCWD, buf, st, 0);
  25 #endif
  26                         }
  27                 }
  28         }
  29 #ifdef SYS_lstat
  30         else if ((fd == AT_FDCWD || *path=='/') && flag==AT_SYMLINK_NOFOLLOW)
  31                 ret = __syscall(SYS_lstat, path, &kst);
  32 #endif
  33 #ifdef SYS_stat
  34         else if ((fd == AT_FDCWD || *path=='/') && !flag)
  35                 ret = __syscall(SYS_stat, path, &kst);
  36 #endif
  37         else ret = __syscall(SYS_fstatat, fd, path, &kst, flag);
  38
  39         if (ret) return __syscall_ret(ret);
  40
  41         *st = (struct stat){
  42                 .st_dev = kst.st_dev,
  43                 .st_ino = kst.st_ino,
  44                 .st_mode = kst.st_mode,
  45                 .st_nlink = kst.st_nlink,
  46                 .st_uid = kst.st_uid,
  47                 .st_gid = kst.st_gid,
  48                 .st_rdev = kst.st_rdev,
  49                 .st_size = kst.st_size,
  50                 .st_blksize = kst.st_blksize,
  51                 .st_blocks = kst.st_blocks,
  52                 .st_atim.tv_sec = kst.st_atime_sec,
  53                 .st_atim.tv_nsec = kst.st_atime_nsec,
  54                 .st_mtim.tv_sec = kst.st_mtime_sec,
  55                 .st_mtim.tv_nsec = kst.st_mtime_nsec,
  56                 .st_ctim.tv_sec = kst.st_ctime_sec,
  57                 .st_ctim.tv_nsec = kst.st_ctime_nsec,
  58         };
  59
  60         return 0;
  61 }
  62
  63 weak_alias(fstatat, fstatat64);