de165b5c9725bf5b87c865f83b8222bdf7f7d5f1
[musl] / 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