diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/fxstatat64.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/fxstatat64.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/fxstatat64.c b/sysdeps/unix/sysv/linux/fxstatat64.c new file mode 100644 index 0000000000..cb932b8e59 --- /dev/null +++ b/sysdeps/unix/sysv/linux/fxstatat64.c @@ -0,0 +1,167 @@ +/* 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. */ + +#include <errno.h> +#include <fcntl.h> +#include <stddef.h> +#include <stdio.h> +#include <string.h> +#include <sys/stat.h> +#include <kernel_stat.h> + +#include <sysdep.h> +#include <sys/syscall.h> +#include <bp-checks.h> + +#include <kernel-features.h> + +#if __ASSUME_STAT64_SYSCALL == 0 +# include <xstatconv.h> +#endif + +#ifdef __NR_stat64 +# if __ASSUME_STAT64_SYSCALL == 0 +/* The variable is shared between all wrappers around *stat64 calls. + This is the definition. */ +extern int __have_no_stat64; +# endif +#endif + +/* Get information about the file NAME in BUF. */ + +int +__fxstatat64 (int vers, int fd, const char *file, struct stat64 *st, int flag) +{ + if (__builtin_expect (vers != _STAT_VER_LINUX, 0)) + { + __set_errno (EINVAL); + return -1; + } + + int result; + INTERNAL_SYSCALL_DECL (err); + +#ifdef __NR_fstatat64 +# ifndef __ASSUME_ATFCTS + if (__have_atfcts >= 0) +# endif + { + result = INTERNAL_SYSCALL (fstatat64, err, 4, fd, file, st, 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)) + return 0; + else + { + __set_errno (INTERNAL_SYSCALL_ERRNO (result, err)); + return -1; + } + } +#endif + +#ifndef __ASSUME_ATFCTS + 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 __ASSUME_STAT64_SYSCALL > 0 + if (flag & AT_SYMLINK_NOFOLLOW) + result = INTERNAL_SYSCALL (lstat64, err, 2, CHECK_STRING (file), + CHECK_1 (st)); + else + result = INTERNAL_SYSCALL (stat64, err, 2, CHECK_STRING (file), + CHECK_1 (st)); + if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) + { +# if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0 + if (st->__st_ino != (__ino_t) st->st_ino) + st->st_ino = st->__st_ino; +# endif + return result; + } +# else + struct kernel_stat kst; +# ifdef __NR_stat64 + if (! __have_no_stat64) + { + if (flag & AT_SYMLINK_NOFOLLOW) + result = INTERNAL_SYSCALL (lstat64, err, 2, CHECK_STRING (file), + CHECK_1 (st)); + else + result = INTERNAL_SYSCALL (stat64, err, 2, CHECK_STRING (file), + CHECK_1 (st)); + + if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) + { +# if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0 + if (st->__st_ino != (__ino_t) st->st_ino) + st->st_ino = st->__st_ino; +# endif + return result; + } + if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS) + goto fail; + + __have_no_stat64 = 1; + } +# endif + + 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 __xstat64_conv (vers, &kst, st); + + fail: +# endif + __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); + + return -1; +#endif +} +libc_hidden_def (__fxstatat64) |