1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* euidaccess -- check if effective user id can access file
5 Copyright (C) 1990-1991, 1995, 1998, 2000, 2003-2006, 2008-2014 Free
6 Software Foundation, Inc.
8 This file is part of the GNU C Library.
10 This program is free software: you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* Written by David MacKenzie and Torbjorn Granlund.
24 Adapted for GNU C library by Roland McGrath. */
31 #include <sys/types.h>
43 # define __set_errno(val) errno = (val)
46 #if defined EACCES && !defined EACCESS
47 # define EACCESS EACCES
60 # define access __access
61 # define getuid __getuid
62 # define getgid __getgid
63 # define geteuid __geteuid
64 # define getegid __getegid
65 # define group_member __group_member
66 # define euidaccess __euidaccess
72 /* Return 0 if the user has permission of type MODE on FILE;
73 otherwise, return -1 and set 'errno'.
74 Like access, except that it uses the effective user and group
75 id's instead of the real ones, and it does not always check for read-only
76 file system, text busy, etc. */
79 euidaccess (const char *file, int mode)
81 #if HAVE_FACCESSAT /* glibc, AIX 7, Solaris 11, Cygwin 1.7 */
82 return faccessat (AT_FDCWD, file, mode, AT_EACCESS);
83 #elif defined EFF_ONLY_OK /* IRIX, OSF/1, Interix */
84 return access (file, mode | EFF_ONLY_OK);
85 #elif defined ACC_SELF /* AIX */
86 return accessx (file, mode, ACC_SELF);
87 #elif HAVE_EACCESS /* FreeBSD */
88 return eaccess (file, mode);
89 #else /* Mac OS X, NetBSD, OpenBSD, HP-UX, Solaris, Cygwin, mingw, BeOS */
91 uid_t uid = getuid ();
92 gid_t gid = getgid ();
93 uid_t euid = geteuid ();
94 gid_t egid = getegid ();
97 # if HAVE_DECL_SETREGID && PREFER_NONREENTRANT_EUIDACCESS
99 /* Define PREFER_NONREENTRANT_EUIDACCESS if you prefer euidaccess to
100 return the correct result even if this would make it
101 nonreentrant. Define this only if your entire application is
102 safe even if the uid or gid might temporarily change. If your
103 application uses signal handlers or threads it is probably not
107 return stat (file, &stats);
114 setreuid (euid, uid);
116 setregid (egid, gid);
118 result = access (file, mode);
123 setreuid (uid, euid);
125 setregid (gid, egid);
133 /* The following code assumes the traditional Unix model, and is not
134 correct on systems that have ACLs or the like. However, it's
135 better than nothing, and it is reentrant. */
137 unsigned int granted;
138 if (uid == euid && gid == egid)
139 /* If we are not set-uid or set-gid, access does the same. */
140 return access (file, mode);
142 if (stat (file, &stats) != 0)
145 /* The super-user can read and write any file, and execute any file
146 that anyone can execute. */
148 && ((mode & X_OK) == 0
149 || (stats.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
152 /* Convert the mode to traditional form, clearing any bogus bits. */
153 if (R_OK == 4 && W_OK == 2 && X_OK == 1 && F_OK == 0)
156 mode = ((mode & R_OK ? 4 : 0)
157 + (mode & W_OK ? 2 : 0)
158 + (mode & X_OK ? 1 : 0));
161 return 0; /* The file exists. */
163 /* Convert the file's permission bits to traditional form. */
164 if (S_IRUSR == (4 << 6) && S_IWUSR == (2 << 6) && S_IXUSR == (1 << 6)
165 && S_IRGRP == (4 << 3) && S_IWGRP == (2 << 3) && S_IXGRP == (1 << 3)
166 && S_IROTH == (4 << 0) && S_IWOTH == (2 << 0) && S_IXOTH == (1 << 0))
167 granted = stats.st_mode;
169 granted = ((stats.st_mode & S_IRUSR ? 4 << 6 : 0)
170 + (stats.st_mode & S_IWUSR ? 2 << 6 : 0)
171 + (stats.st_mode & S_IXUSR ? 1 << 6 : 0)
172 + (stats.st_mode & S_IRGRP ? 4 << 3 : 0)
173 + (stats.st_mode & S_IWGRP ? 2 << 3 : 0)
174 + (stats.st_mode & S_IXGRP ? 1 << 3 : 0)
175 + (stats.st_mode & S_IROTH ? 4 << 0 : 0)
176 + (stats.st_mode & S_IWOTH ? 2 << 0 : 0)
177 + (stats.st_mode & S_IXOTH ? 1 << 0 : 0));
179 if (euid == stats.st_uid)
181 else if (egid == stats.st_gid || group_member (stats.st_gid))
184 if ((mode & ~granted) == 0)
186 __set_errno (EACCESS);
194 weak_alias (__euidaccess, euidaccess)
205 main (int argc, char **argv)
211 program_name = argv[0];
215 mode = atoi (argv[2]);
217 err = euidaccess (file, mode);
218 printf ("%d\n", err);
220 error (0, errno, "%s", file);