1 /* Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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
26 #include <kernel-features.h>
27 #include <sysdep-cancel.h>
28 #include <not-cancel.h>
32 # define OPENAT openat
33 # define __OPENAT_2 __openat_2
35 # ifndef __ASSUME_ATFCTS
36 /* Set errno after a failed call. If BUF is not null,
37 it is a /proc/self/fd/ path name we just tried to use. */
40 __atfct_seterrno (int errval, int fd, const char *buf)
46 if (errval == ENOTDIR || errval == ENOENT)
48 /* This can mean either the file descriptor is invalid or
49 /proc is not mounted. */
50 if (__fxstat64 (_STAT_VER, fd, &st) != 0)
51 /* errno is already set correctly. */
54 /* If /proc is not mounted there is nothing we can do. */
55 if ((errval != ENOTDIR || S_ISDIR (st.st_mode))
56 && (__xstat64 (_STAT_VER, "/proc/self/fd", &st) != 0
57 || !S_ISDIR (st.st_mode)))
70 #define OPENAT_NOT_CANCEL CONCAT (OPENAT)
71 #define CONCAT(name) CONCAT2 (name)
72 #define CONCAT2(name) __##name##_nocancel
76 OPENAT_NOT_CANCEL (fd, file, oflag, mode)
83 /* We have to add the O_LARGEFILE flag for openat64. */
88 INTERNAL_SYSCALL_DECL (err);
92 # ifndef __ASSUME_ATFCTS
93 if (__have_atfcts >= 0)
96 res = INLINE_SYSCALL (openat, 4, fd, file, oflag, mode);
98 # ifndef __ASSUME_ATFCTS
99 if (res == -1 && errno == ENOSYS)
107 #ifndef __ASSUME_ATFCTS
110 if (fd != AT_FDCWD && file[0] != '/')
112 size_t filelen = strlen (file);
113 if (__builtin_expect (filelen == 0, 0))
115 __set_errno (ENOENT);
119 static const char procfd[] = "/proc/self/fd/%d/%s";
120 /* Buffer for the path name we are going to use. It consists of
121 - the string /proc/self/fd/
122 - the file descriptor number
123 - the file name provided.
124 The final NUL is included in the sizeof. A bit of overhead
125 due to the format elements compensates for possible negative
127 size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
128 buf = alloca (buflen);
130 /* Note: snprintf cannot be canceled. */
131 __snprintf (buf, buflen, procfd, fd, file);
135 res = INTERNAL_SYSCALL (open, err, 3, file, oflag, mode);
137 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (res, err), 0))
139 __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (res, err), fd, buf);
147 #define UNDERIZE(name) UNDERIZE_1 (name)
148 #define UNDERIZE_1(name) __##name
149 #define __OPENAT UNDERIZE (OPENAT)
152 /* Open FILE with access OFLAG. Interpret relative paths relative to
153 the directory associated with FD. If OFLAG includes O_CREAT, a
154 third argument is the file protection. */
156 __OPENAT (fd, file, oflag)
165 va_start (arg, oflag);
166 mode = va_arg (arg, mode_t);
171 return OPENAT_NOT_CANCEL (fd, file, oflag, mode);
173 int oldtype = LIBC_CANCEL_ASYNC ();
175 int res = OPENAT_NOT_CANCEL (fd, file, oflag, mode);
177 LIBC_CANCEL_RESET (oldtype);
181 libc_hidden_def (__OPENAT)
182 weak_alias (__OPENAT, OPENAT)
186 __OPENAT_2 (fd, file, oflag)
192 #define MSG(s) MSG2 (s)
193 #define MSG2(s) "invalid " #s " call: O_CREAT without mode"
194 __fortify_fail (MSG (OPENAT));
196 return __OPENAT (fd, file, oflag);