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authorRich Felker <dalias@aerifal.cx>2019-07-18 19:38:12 -0400
committerRich Felker <dalias@aerifal.cx>2019-07-18 19:38:12 -0400
commit01ae3fc6d48f4a45535189b7a6db286535af08ca (patch)
tree5777ee3da734eb3b6a15dedc984bcd9934bf6fde /src/stat/fstatat.c
parent9493892021eac4edf1776d945bcdd3f7a96f6978 (diff)
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decouple struct stat from kernel type
presently, all archs/ABIs have struct stat matching the kernel stat[64] type, except mips/mipsn32/mips64 which do conversion hacks in syscall_arch.h to work around bugs in the kernel type. this patch completely decouples them and adds a translation step to the success path of fstatat. at present, this is just a gratuitous copying, but it opens up multiple possibilities for future support for 64-bit time_t on 32-bit archs and for cleaned-up/unified ABIs. for clarity, the mips hacks are not yet removed in this commit, so the mips kstat structs still correspond to the output of the hacks in their syscall_arch.h files, not the raw kernel type. a subsequent commit will fix this.
Diffstat (limited to 'src/stat/fstatat.c')
-rw-r--r--src/stat/fstatat.c31
1 files changed, 27 insertions, 4 deletions
diff --git a/src/stat/fstatat.c b/src/stat/fstatat.c
index f5bc3685..29d63343 100644
--- a/src/stat/fstatat.c
+++ b/src/stat/fstatat.c
@@ -4,10 +4,12 @@
#include <fcntl.h>
#include <errno.h>
#include "syscall.h"
+#include "kstat.h"
int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
{
int ret;
+ struct kstat kst;
if (flag==AT_EMPTY_PATH && fd>=0 && !*path) {
ret = __syscall(SYS_fstat, fd, st);
@@ -26,15 +28,36 @@ int fstatat(int fd, const char *restrict path, struct stat *restrict st, int fla
}
#ifdef SYS_lstat
else if ((fd == AT_FDCWD || *path=='/') && flag==AT_SYMLINK_NOFOLLOW)
- ret = __syscall(SYS_lstat, path, st);
+ ret = __syscall(SYS_lstat, path, &kst);
#endif
#ifdef SYS_stat
else if ((fd == AT_FDCWD || *path=='/') && !flag)
- ret = __syscall(SYS_stat, path, st);
+ ret = __syscall(SYS_stat, path, &kst);
#endif
- else ret = __syscall(SYS_fstatat, fd, path, st, flag);
+ else ret = __syscall(SYS_fstatat, fd, path, &kst, flag);
- return __syscall_ret(ret);
+ if (ret) return __syscall_ret(ret);
+
+ *st = (struct stat){
+ .st_dev = kst.st_dev,
+ .st_ino = kst.st_ino,
+ .st_mode = kst.st_mode,
+ .st_nlink = kst.st_nlink,
+ .st_uid = kst.st_uid,
+ .st_gid = kst.st_gid,
+ .st_rdev = kst.st_rdev,
+ .st_size = kst.st_size,
+ .st_blksize = kst.st_blksize,
+ .st_blocks = kst.st_blocks,
+ .st_atim.tv_sec = kst.st_atime_sec,
+ .st_atim.tv_nsec = kst.st_atime_nsec,
+ .st_mtim.tv_sec = kst.st_mtime_sec,
+ .st_mtim.tv_nsec = kst.st_mtime_nsec,
+ .st_ctim.tv_sec = kst.st_ctime_sec,
+ .st_ctim.tv_nsec = kst.st_ctime_nsec,
+ };
+
+ return 0;
}
weak_alias(fstatat, fstatat64);