linux: Implement {l}fstat{at} in terms of fstatat

Both fstatat and fstata64 calls the old fxstatat and fxstatat64
repectivelly with _STAT_VER, the one currently exported as default
for all ABIs.

Checked with a build for all affected ABIs. I also checked on x86_64,
i686, powerpc, powerpc64le, sparcv9, sparc64, s390, and s390x.

Reviewed-by: Lukasz Majewski <lukma@denx.de>

8 files changed, 275 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/fstat.c b/sysdeps/unix/sysv/linux/fstat.c
new file mode 100644
index 0000000000..bdbeded956
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fstat.c
@@ -0,0 +1,31 @@
+/* Get file status.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sys/stat.h>
+#include <kernel_stat.h>
+#include <fcntl.h>
+
+#if !XSTAT_IS_XSTAT64
+int
+__fstat (int fd, struct stat *buf)
+{
+  return __fstatat (fd, "", buf, AT_EMPTY_PATH);
+}
+
+weak_alias (__fstat, fstat)
+#endif
diff --git a/sysdeps/unix/sysv/linux/fstat64.c b/sysdeps/unix/sysv/linux/fstat64.c
new file mode 100644
index 0000000000..c2ff1ff577
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fstat64.c
@@ -0,0 +1,38 @@
+/* Get file status.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define __fstat __redirect___fstat
+#define fstat   __redirect_fstat
+#include <sys/stat.h>
+#undef __fstat
+#undef fstat
+#include <fcntl.h>
+#include <kernel_stat.h>
+
+int
+__fstat64 (int fd, struct stat64 *buf)
+{
+  return __fstatat64 (fd, "", buf, AT_EMPTY_PATH);
+}
+hidden_def (__fstat64)
+weak_alias (__fstat64, fstat64)
+
+#if XSTAT_IS_XSTAT64
+strong_alias (__fstat64, __fstat)
+weak_alias (__fstat64, fstat)
+#endif
diff --git a/sysdeps/unix/sysv/linux/fstatat.c b/sysdeps/unix/sysv/linux/fstatat.c
new file mode 100644
index 0000000000..457496605c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fstatat.c
@@ -0,0 +1,30 @@
+/* Get file status.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sys/stat.h>
+#include <kernel_stat.h>
+
+#if !XSTAT_IS_XSTAT64
+int
+__fstatat (int fd, const char *file, struct stat *buf, int flag)
+{
+  return __fxstatat (_STAT_VER, fd, file, buf, flag);
+}
+
+weak_alias (__fstatat, fstatat)
+#endif
diff --git a/sysdeps/unix/sysv/linux/fstatat64.c b/sysdeps/unix/sysv/linux/fstatat64.c
new file mode 100644
index 0000000000..46487919e6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fstatat64.c
@@ -0,0 +1,38 @@
+/* Get file status.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define __fstatat __redirect___fstatat
+#define fstatat   __redirect_fstatat
+#include <sys/stat.h>
+#undef __fstatat
+#undef fstatat
+#include <kernel_stat.h>
+
+int
+__fstatat64 (int fd, const char *file, struct stat64 *buf, int flag)
+{
+  return __fxstatat64 (_STAT_VER, fd, file, buf, flag);
+}
+hidden_def (__fstatat64)
+weak_alias (__fstatat64, fstatat64)
+
+#if XSTAT_IS_XSTAT64
+strong_alias (__fstatat64, __fstatat)
+weak_alias (__fstatat64, fstatat)
+strong_alias (__fstatat64, __GI___fstatat);
+#endif
diff --git a/sysdeps/unix/sysv/linux/lstat.c b/sysdeps/unix/sysv/linux/lstat.c
new file mode 100644
index 0000000000..b0bdeee9e9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/lstat.c
@@ -0,0 +1,31 @@
+/* Get file status.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <kernel_stat.h>
+
+#if !XSTAT_IS_XSTAT64
+int
+__lstat (const char *file, struct stat *buf)
+{
+  return __fstatat (AT_FDCWD, file, buf, AT_SYMLINK_NOFOLLOW);
+}
+
+weak_alias (__lstat, lstat)
+#endif
diff --git a/sysdeps/unix/sysv/linux/lstat64.c b/sysdeps/unix/sysv/linux/lstat64.c
new file mode 100644
index 0000000000..e5f02e9822
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/lstat64.c
@@ -0,0 +1,38 @@
+/* Get file status.
+   Copyright (C) 1996-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define __lstat __redirect___lstat
+#define lstat   __redirect_lstat
+#include <sys/stat.h>
+#undef __lstat
+#undef lstat
+#include <fcntl.h>
+#include <kernel_stat.h>
+
+int
+__lstat64 (const char *file, struct stat64 *buf)
+{
+  return __fstatat64 (AT_FDCWD, file, buf, AT_SYMLINK_NOFOLLOW);
+}
+hidden_def (__lstat64)
+weak_alias (__lstat64, lstat64)
+
+#if XSTAT_IS_XSTAT64
+strong_alias (__lstat64, __lstat)
+weak_alias (__lstat64, lstat)
+#endif
diff --git a/sysdeps/unix/sysv/linux/stat.c b/sysdeps/unix/sysv/linux/stat.c
new file mode 100644
index 0000000000..a77502eb95
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/stat.c
@@ -0,0 +1,31 @@
+/* Get file status.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <kernel_stat.h>
+
+#if !XSTAT_IS_XSTAT64
+int
+__stat (const char *file, struct stat *buf)
+{
+  return __fstatat (AT_FDCWD, file, buf, 0);
+}
+
+weak_alias (__stat, stat)
+#endif
diff --git a/sysdeps/unix/sysv/linux/stat64.c b/sysdeps/unix/sysv/linux/stat64.c
new file mode 100644
index 0000000000..2f40037c2c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/stat64.c
@@ -0,0 +1,38 @@
+/* Get file status.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define __stat __redirect___stat
+#define stat   __redirect_stat
+#include <sys/stat.h>
+#undef __stat
+#undef stat
+#include <fcntl.h>
+#include <kernel_stat.h>
+
+int
+__stat64 (const char *file, struct stat64 *buf)
+{
+  return __fstatat64 (AT_FDCWD, file, buf, 0);
+}
+hidden_def (__stat64)
+weak_alias (__stat64, stat64)
+
+#if XSTAT_IS_XSTAT64
+strong_alias (__stat64, __stat)
+weak_alias (__stat64, stat)
+#endif