/* euidaccess -- check if effective user id can access file
- Copyright (C) 1990, 1991, 1995, 1998, 2000, 2003, 2004, 2005, 2006
- Free Software Foundation, Inc.
+ Copyright (C) 1990-1991, 1995, 1998, 2000, 2003-2006, 2008-2013 Free
+ Software Foundation, Inc.
This file is part of the GNU C Library.
#ifndef _LIBC
# include <config.h>
-# include "euidaccess.h"
#endif
+#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
+#include "root-uid.h"
+
#if HAVE_LIBGEN_H
# include <libgen.h>
#endif
# undef stat
# define stat stat64
-#else
-
-# include "group-member.h"
-
#endif
/* Return 0 if the user has permission of type MODE on FILE;
- otherwise, return -1 and set `errno'.
+ otherwise, return -1 and set 'errno'.
Like access, except that it uses the effective user and group
id's instead of the real ones, and it does not always check for read-only
file system, text busy, etc. */
int
euidaccess (const char *file, int mode)
{
-#if defined EFF_ONLY_OK
+#if HAVE_FACCESSAT /* glibc, AIX 7, Solaris 11, Cygwin 1.7 */
+ return faccessat (AT_FDCWD, file, mode, AT_EACCESS);
+#elif defined EFF_ONLY_OK /* IRIX, OSF/1, Interix */
return access (file, mode | EFF_ONLY_OK);
-#elif defined ACC_SELF
+#elif defined ACC_SELF /* AIX */
return accessx (file, mode, ACC_SELF);
-#elif HAVE_EACCESS
+#elif HAVE_EACCESS /* FreeBSD */
return eaccess (file, mode);
-#else
+#else /* Mac OS X, NetBSD, OpenBSD, HP-UX, Solaris, Cygwin, mingw, BeOS */
uid_t uid = getuid ();
gid_t gid = getgid ();
int saved_errno;
if (uid != euid)
- setreuid (euid, uid);
+ setreuid (euid, uid);
if (gid != egid)
- setregid (egid, gid);
+ setregid (egid, gid);
result = access (file, mode);
saved_errno = errno;
/* Restore them. */
if (uid != euid)
- setreuid (uid, euid);
+ setreuid (uid, euid);
if (gid != egid)
- setregid (gid, egid);
+ setregid (gid, egid);
errno = saved_errno;
return result;
/* The super-user can read and write any file, and execute any file
that anyone can execute. */
- if (euid == 0 && ((mode & X_OK) == 0
- || (stats.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
+ if (euid == ROOT_UID
+ && ((mode & X_OK) == 0
+ || (stats.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
return 0;
/* Convert the mode to traditional form, clearing any bogus bits. */
mode &= 7;
else
mode = ((mode & R_OK ? 4 : 0)
- + (mode & W_OK ? 2 : 0)
- + (mode & X_OK ? 1 : 0));
+ + (mode & W_OK ? 2 : 0)
+ + (mode & X_OK ? 1 : 0));
if (mode == 0)
- return 0; /* The file exists. */
+ return 0; /* The file exists. */
/* Convert the file's permission bits to traditional form. */
if (S_IRUSR == (4 << 6) && S_IWUSR == (2 << 6) && S_IXUSR == (1 << 6)
granted = stats.st_mode;
else
granted = ((stats.st_mode & S_IRUSR ? 4 << 6 : 0)
- + (stats.st_mode & S_IWUSR ? 2 << 6 : 0)
- + (stats.st_mode & S_IXUSR ? 1 << 6 : 0)
- + (stats.st_mode & S_IRGRP ? 4 << 3 : 0)
- + (stats.st_mode & S_IWGRP ? 2 << 3 : 0)
- + (stats.st_mode & S_IXGRP ? 1 << 3 : 0)
- + (stats.st_mode & S_IROTH ? 4 << 0 : 0)
- + (stats.st_mode & S_IWOTH ? 2 << 0 : 0)
- + (stats.st_mode & S_IXOTH ? 1 << 0 : 0));
+ + (stats.st_mode & S_IWUSR ? 2 << 6 : 0)
+ + (stats.st_mode & S_IXUSR ? 1 << 6 : 0)
+ + (stats.st_mode & S_IRGRP ? 4 << 3 : 0)
+ + (stats.st_mode & S_IWGRP ? 2 << 3 : 0)
+ + (stats.st_mode & S_IXGRP ? 1 << 3 : 0)
+ + (stats.st_mode & S_IROTH ? 4 << 0 : 0)
+ + (stats.st_mode & S_IWOTH ? 2 << 0 : 0)
+ + (stats.st_mode & S_IXOTH ? 1 << 0 : 0));
if (euid == stats.st_uid)
granted >>= 6;