1 /*
2 * Copyright (C) 2012-2013 ProFUSION embedded systems
3 *
4 * This program 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 * This program 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 this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include <dlfcn.h>
19 #include <errno.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24 #include <sys/utsname.h>
25
26 #include "testsuite.h"
27
uname(struct utsname * u)28 TS_EXPORT int uname(struct utsname *u)
29 {
30 static void *nextlib = NULL;
31 static int (*nextlib_uname)(struct utsname *u);
32 const char *release;
33 int err;
34 size_t sz;
35
36 if (nextlib == NULL) {
37 #ifdef RTLD_NEXT
38 nextlib = RTLD_NEXT;
39 #else
40 nextlib = dlopen("libc.so.6", RTLD_LAZY);
41 #endif
42 nextlib_uname = dlsym(nextlib, "uname");
43 }
44
45 err = nextlib_uname(u);
46 if (err < 0)
47 return err;
48
49 if (!environ)
50 /*
51 * probably called from within glibc before main(); unsafe
52 * to call getenv()
53 */
54 return 0;
55
56 release = getenv(S_TC_UNAME_R);
57 if (release == NULL) {
58 fprintf(stderr, "TRAP uname(): missing export %s?\n",
59 S_TC_UNAME_R);
60 return 0;
61 }
62
63 sz = strlen(release) + 1;
64 if (sz > sizeof(u->release)) {
65 fprintf(stderr, "uname(): sizeof release (%s) "
66 "is greater than available space: %zu",
67 release, sizeof(u->release));
68 errno = -EFAULT;
69 return -1;
70 }
71
72 memcpy(u->release, release, sz);
73 return 0;
74 }
75