diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/alpha/fxstatat.c')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/alpha/fxstatat.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/alpha/fxstatat.c b/ports/sysdeps/unix/sysv/linux/alpha/fxstatat.c new file mode 100644 index 0000000000..417f9d3eab --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/alpha/fxstatat.c @@ -0,0 +1,140 @@ +/* Copyright (C) 2005, 2006, 2009 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 + <http://www.gnu.org/licenses/>. */ + +#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 <xstatconv.h> + +#undef __fxstatat64 + +#ifdef __ASSUME_ATFCTS +# define __have_atfcts 1 +#endif +#ifdef __ASSUME_STAT64_SYSCALL +# define __libc_missing_axp_stat64 0 +#endif + +/* Get information about the file NAME in BUF. */ +int +__fxstatat (int vers, int fd, const char *file, struct stat *st, int flag) +{ + INTERNAL_SYSCALL_DECL (err); + int result, errno_out; + + /* ??? The __fxstatat entry point is new enough that it must be using + vers == _STAT_VER_KERNEL64. For the benefit of dl-fxstatat64.c, we + cannot actually check this, lest the compiler not optimize the rest + of the function away. */ + +#ifdef __NR_fstatat64 + if (__have_atfcts >= 0) + { + result = INTERNAL_SYSCALL (fstatat64, err, 4, fd, file, st, flag); + if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) + return result; + errno_out = INTERNAL_SYSCALL_ERRNO (result, err); +#ifndef __ASSUME_ATFCTS + if (errno_out == ENOSYS) + __have_atfcts = -1; + else +#endif + { + __set_errno (errno_out); + return -1; + } + } +#endif /* __NR_fstatat64 */ + + if (flag & ~AT_SYMLINK_NOFOLLOW) + { + __set_errno (EINVAL); + return -1; + } + + char *buf = NULL; + + if (fd != AT_FDCWD && file[0] != '/') + { + size_t filelen = strlen (file); + if (__builtin_expect (filelen == 0, 0)) + { + __set_errno (ENOENT); + return -1; + } + + 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; + } + +#ifdef __NR_stat64 + if (!__libc_missing_axp_stat64) + { + if (flag & AT_SYMLINK_NOFOLLOW) + result = INTERNAL_SYSCALL (lstat64, err, 2, file, st); + else + result = INTERNAL_SYSCALL (stat64, err, 2, file, st); + + if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) + return result; + errno_out = INTERNAL_SYSCALL_ERRNO (result, err); +# if __ASSUME_STAT64_SYSCALL == 0 + if (errno_out == ENOSYS) + __libc_missing_axp_stat64 = 1; + else +# endif + goto fail; + } +#endif /* __NR_stat64 */ + + struct kernel_stat kst; + + if (flag & AT_SYMLINK_NOFOLLOW) + result = INTERNAL_SYSCALL (lstat, err, 2, file, &kst); + else + result = INTERNAL_SYSCALL (stat, err, 2, file, &kst); + + if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) + return __xstat_conv (vers, &kst, st); + errno_out = INTERNAL_SYSCALL_ERRNO (result, err); + + fail: + __atfct_seterrno (errno_out, fd, buf); + + return -1; +} +libc_hidden_def (__fxstatat) +strong_alias (__fxstatat, __fxstatat64); +libc_hidden_ver(__fxstatat, __fxstatat64); |