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Diffstat (limited to 'sysdeps/unix/sysv/linux/fxstatat.c')
-rw-r--r--sysdeps/unix/sysv/linux/fxstatat.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/fxstatat.c b/sysdeps/unix/sysv/linux/fxstatat.c
new file mode 100644
index 0000000000..c1c416abd7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fxstatat.c
@@ -0,0 +1,141 @@
+/* Copyright (C) 2005, 2006 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* Ho hum, if fxstatat == fxstatat64 we must get rid of the prototype or gcc
+ will complain since they don't strictly match. */
+#define __fxstatat64 __fxstatat64_disable
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <kernel_stat.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+#include <bp-checks.h>
+
+#include <xstatconv.h>
+
+/* Get information about the file NAME in BUF. */
+int
+__fxstatat (int vers, int fd, const char *file, struct stat *st, int flag)
+{
+ int result;
+ INTERNAL_SYSCALL_DECL (err);
+#ifdef STAT_IS_KERNEL_STAT
+# define kst (*st)
+#else
+ struct kernel_stat kst;
+#endif
+
+#ifdef __NR_newfstatat
+# ifndef __ASSUME_ATFCTS
+ if (__have_atfcts >= 0)
+# endif
+ {
+ result = INTERNAL_SYSCALL (newfstatat, err, 4, fd, file, &kst, flag);
+# ifndef __ASSUME_ATFCTS
+ if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1)
+ && INTERNAL_SYSCALL_ERRNO (result, err) == ENOSYS)
+ __have_atfcts = -1;
+ else
+# endif
+ if (!__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1))
+ {
+#ifdef STAT_IS_KERNEL_STAT
+ return 0;
+#else
+ return __xstat_conv (vers, &kst, st);
+#endif
+ }
+ else
+ {
+ __set_errno (INTERNAL_SYSCALL_ERRNO (result, err));
+ return -1;
+ }
+ }
+#endif
+
+ if (flag & ~AT_SYMLINK_NOFOLLOW)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ char *buf = NULL;
+
+ if (fd != AT_FDCWD && file[0] != '/')
+ {
+ size_t filelen = strlen (file);
+ static const char procfd[] = "/proc/self/fd/%d/%s";
+ /* Buffer for the path name we are going to use. It consists of
+ - the string /proc/self/fd/
+ - the file descriptor number
+ - the file name provided.
+ The final NUL is included in the sizeof. A bit of overhead
+ due to the format elements compensates for possible negative
+ numbers. */
+ size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
+ buf = alloca (buflen);
+
+ __snprintf (buf, buflen, procfd, fd, file);
+ file = buf;
+ }
+
+ if (vers == _STAT_VER_KERNEL)
+ {
+ if (flag & AT_SYMLINK_NOFOLLOW)
+ result = INTERNAL_SYSCALL (lstat, err, 2, CHECK_STRING (file),
+ CHECK_1 ((struct kernel_stat *) st));
+ else
+ result = INTERNAL_SYSCALL (stat, err, 2, CHECK_STRING (file),
+ CHECK_1 ((struct kernel_stat *) st));
+
+ if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
+ return result;
+ }
+#ifdef STAT_IS_KERNEL_STAT
+ else
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+#else
+ if (flag & AT_SYMLINK_NOFOLLOW)
+ result = INTERNAL_SYSCALL (lstat, err, 2, CHECK_STRING (file),
+ __ptrvalue (&kst));
+ else
+ result = INTERNAL_SYSCALL (stat, err, 2, CHECK_STRING (file),
+ __ptrvalue (&kst));
+
+ if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
+ return __xstat_conv (vers, &kst, st);
+#endif
+
+ __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf);
+
+ return -1;
+}
+libc_hidden_def (__fxstatat)
+#ifdef XSTAT_IS_XSTAT64
+# undef __fxstatat64
+strong_alias (__fxstatat, __fxstatat64);
+libc_hidden_def (__fxstatat64)
+#endif