projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 0ecb606c JJ |
1 | /* Copyright (C) 2005, 2006 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Lesser General Public | |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| 15 | License along with the GNU C Library; if not, write to the Free | |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 17 | 02111-1307 USA. */ | |
| 18 | ||
| 19 | /* Ho hum, since fxstatat == fxstatat64 we must get rid of the | |
| 20 | prototype or gcc will complain since they don't strictly match. */ | |
| 21 | #define __fxstatat64 __fxstatat64_disable | |
| 22 | ||
| 23 | #include <errno.h> | |
| 24 | #include <fcntl.h> | |
| 25 | #include <stddef.h> | |
| 26 | #include <stdio.h> | |
| 27 | #include <string.h> | |
| 28 | #include <sys/stat.h> | |
| 29 | ||
| 30 | #include <sysdep.h> | |
| 31 | #include <kernel-features.h> | |
| 32 | #include <sys/syscall.h> | |
| 33 | #include <bp-checks.h> | |
| 34 | ||
| 35 | ||
| 36 | /* Get information about the file NAME relative to FD in ST. */ | |
| 37 | int | |
| 38 | __fxstatat (int vers, int fd, const char *file, struct stat *st, int flag) | |
| 39 | { | |
| 40 | if (vers != _STAT_VER_KERNEL && vers != _STAT_VER_LINUX) | |
| 41 | { | |
| 42 | __set_errno (EINVAL); | |
| 43 | return -1; | |
| 44 | } | |
| 45 | ||
| 46 | int res; | |
| 47 | ||
| 48 | #ifdef __NR_newfstatat | |
| 49 | # ifndef __ASSUME_ATFCTS | |
| 50 | if (__have_atfcts >= 0) | |
| 51 | # endif | |
| 52 | { | |
| 53 | res = INLINE_SYSCALL (newfstatat, 4, fd, file, st, flag); | |
| 54 | # ifndef __ASSUME_ATFCTS | |
| 55 | if (res == -1 && errno == ENOSYS) | |
| 56 | __have_atfcts = -1; | |
| 57 | else | |
| 58 | # endif | |
| 59 | return res; | |
| 60 | } | |
| 61 | #endif | |
| 62 | ||
| 63 | #ifndef __ASSUME_ATFCTS | |
| 64 | if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) | |
| 65 | { | |
| 66 | __set_errno (EINVAL); | |
| 67 | return -1; | |
| 68 | } | |
| 69 | ||
| 70 | char *buf = NULL; | |
| 71 | ||
| 72 | if (fd != AT_FDCWD && file[0] != '/') | |
| 73 | { | |
| 74 | size_t filelen = strlen (file); | |
| 75 | static const char procfd[] = "/proc/self/fd/%d/%s"; | |
| 76 | /* Buffer for the path name we are going to use. It consists of | |
| 77 | - the string /proc/self/fd/ | |
| 78 | - the file descriptor number | |
| 79 | - the file name provided. | |
| 80 | The final NUL is included in the sizeof. A bit of overhead | |
| 81 | due to the format elements compensates for possible negative | |
| 82 | numbers. */ | |
| 83 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
| 84 | buf = alloca (buflen); | |
| 85 | ||
| 86 | __snprintf (buf, buflen, procfd, fd, file); | |
| 87 | file = buf; | |
| 88 | } | |
| 89 | ||
| 90 | INTERNAL_SYSCALL_DECL (err); | |
| 91 | ||
| 92 | if (flag & AT_SYMLINK_NOFOLLOW) | |
| 93 | res = INTERNAL_SYSCALL (lstat, err, 2, file, CHECK_1 (st)); | |
| 94 | else | |
| 95 | res = INTERNAL_SYSCALL (stat, err, 2, file, CHECK_1 (st)); | |
| 96 | ||
| 97 | if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (res, err), 0)) | |
| 98 | { | |
| 99 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (res, err), fd, buf); | |
| 100 | res = -1; | |
| 101 | } | |
| 102 | ||
| 103 | return res; | |
| 104 | #endif | |
| 105 | } | |
| 106 | libc_hidden_def (__fxstatat) | |
| 107 | #undef __fxstatat64 | |
| 108 | strong_alias (__fxstatat, __fxstatat64); | |
| 109 | strong_alias (__fxstatat64, __GI___fxstatat64) |