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Ticket #3821: initialize struct stat st_[acm]tim.tv_nsec when present

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struct stat in libc for Linux kernel contains few fields more since 14+
years [1]. From bits/stat.h:

```
        struct timespec st_atim;		/* Time of last access.  */
        struct timespec st_mtim;		/* Time of last modification.  */
        struct timespec st_ctim;		/* Time of last status change.  */
    # define st_atime st_atim.tv_sec	/* Backward compatibility.  */
    # define st_mtime st_mtim.tv_sec
    # define st_ctime st_ctim.tv_sec
```

The conventional fields became an alias.

POSIX.1-2008 made struct stat st_[acm]tim mandatory [2].

OS takes care to initialize struct stat properly [3]. By not using an OS
syscall or a libc wrapper to fill struct stat, we have to take care of
initializing all fields (or at least those being used later) explicitly.

[1]: https://www.sourceware.org/ml/libc-alpha/2002-12/msg00011.html
[2]: https://www.sourceware.org/ml/libc-alpha/2009-11/msg00102.html
[3]: https://www.sourceware.org/ml/libc-alpha/2002-12/msg00013.html

Fixes: file timestamps not preserved (https://mail.gnome.org/archives/mc-devel/2017-April/msg00000.html)
Reported-By: Nerijus Baliunas <nerijus@users.sourceforge.net>
Signed-off-by: Yury V. Zaytsev <yury@shurup.com>
This commit is contained in:
Andrey Gursky 2017-04-19 01:59:24 +02:00 committed by Yury V. Zaytsev
parent 71c8f5bedc
commit 243cdc1755
3 changed files with 19 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
configure.ac
View File

@ -181,7 +181,7 @@ AC_TYPE_PID_T
AC_TYPE_UID_T
AC_STRUCT_ST_BLOCKS
AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_rdev])
AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_rdev, struct stat.st_mtim])
gl_STAT_SIZE
AH_TEMPLATE([sig_atomic_t],

15
src/vfs/cpio/cpio.c
View File

@ -462,9 +462,15 @@ cpio_create_entry (struct vfs_class *me, struct vfs_s_super *super, struct stat
entry->ino->st.st_mode = st->st_mode;
entry->ino->st.st_uid = st->st_uid;
entry->ino->st.st_gid = st->st_gid;
#ifdef HAVE_STRUCT_STAT_ST_MTIM
entry->ino->st.st_atim = st->st_atim;
entry->ino->st.st_mtim = st->st_mtim;
entry->ino->st.st_ctim = st->st_ctim;
#else
entry->ino->st.st_atime = st->st_atime;
entry->ino->st.st_mtime = st->st_mtime;
entry->ino->st.st_ctime = st->st_ctime;
#endif
}
g_free (name);
@ -589,6 +595,9 @@ cpio_read_bin_head (struct vfs_class *me, struct vfs_s_super *super)
st.st_rdev = u.buf.c_rdev;
#endif
st.st_size = (u.buf.c_filesizes[0] << 16) | u.buf.c_filesizes[1];
#ifdef HAVE_STRUCT_STAT_ST_MTIM
st.st_atim.tv_nsec = st.st_mtim.tv_nsec = st.st_ctim.tv_nsec = 0;
#endif
st.st_atime = st.st_mtime = st.st_ctime = (u.buf.c_mtimes[0] << 16) | u.buf.c_mtimes[1];
return cpio_create_entry (me, super, &st, name);
@ -658,6 +667,9 @@ cpio_read_oldc_head (struct vfs_class *me, struct vfs_s_super *super)
u.st.st_rdev = hd.c_rdev;
#endif
u.st.st_size = hd.c_filesize;
#ifdef HAVE_STRUCT_STAT_ST_MTIM
u.st.st_atim.tv_nsec = u.st.st_mtim.tv_nsec = u.st.st_ctim.tv_nsec = 0;
#endif
u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime;
return cpio_create_entry (me, super, &u.st, name);
@ -736,6 +748,9 @@ cpio_read_crc_head (struct vfs_class *me, struct vfs_s_super *super)
u.st.st_rdev = makedev (hd.c_rdev, hd.c_rdevmin);
#endif
u.st.st_size = hd.c_filesize;
#ifdef HAVE_STRUCT_STAT_ST_MTIM
u.st.st_atim.tv_nsec = u.st.st_mtim.tv_nsec = u.st.st_ctim.tv_nsec = 0;
#endif
u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime;
return cpio_create_entry (me, super, &u.st, name);

3
src/vfs/tar/tar.c
View File

@ -442,6 +442,9 @@ tar_fill_stat (struct vfs_s_super *archive, struct stat *st, union record *heade
}
st->st_size = h_size;
#ifdef HAVE_STRUCT_STAT_ST_MTIM
st->st_atim.tv_nsec = st->st_mtim.tv_nsec = st->st_ctim.tv_nsec = 0;
#endif
st->st_mtime = tar_from_oct (1 + 12, header->header.mtime);
st->st_atime = 0;
st->st_ctime = 0;