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32b4fe6a | 1 | /* Operating system specific code for generic dynamic loader functions. |
1f3109a5 | 2 | Copyright (C) 2000, 2001 Free Software Foundation, Inc. |
32b4fe6a UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
b3e6e3e3 | 20 | #include <string.h> |
32b4fe6a | 21 | #include <sys/sysctl.h> |
fc5f4a97 | 22 | #include <sys/utsname.h> |
b4246fd6 UD |
23 | #include "kernel-features.h" |
24 | ||
25 | #ifndef MIN | |
26 | # define MIN(a,b) (((a)<(b))?(a):(b)) | |
27 | #endif | |
32b4fe6a UD |
28 | |
29 | #ifdef SHARED | |
30 | /* This is the function used in the dynamic linker to print the fatal error | |
31 | message. */ | |
32 | static inline void | |
33 | __attribute__ ((__noreturn__)) | |
34 | dl_fatal (const char *str) | |
35 | { | |
35fc382a | 36 | _dl_dprintf (2, str); |
32b4fe6a UD |
37 | _exit (1); |
38 | } | |
39 | #endif | |
40 | ||
41 | ||
42 | #define DL_SYSDEP_OSCHECK(FATAL) \ | |
43 | do { \ | |
44 | /* Test whether the kernel is new enough. This test is only \ | |
45 | performed if the library is not compiled to run on all \ | |
46 | kernels. */ \ | |
47 | if (__LINUX_KERNEL_VERSION > 0) \ | |
48 | { \ | |
39cfe8dd UD |
49 | char bufmem[64]; \ |
50 | char *buf = bufmem; \ | |
32b4fe6a UD |
51 | unsigned int version; \ |
52 | int parts; \ | |
53 | char *cp; \ | |
39cfe8dd | 54 | struct utsname uts; \ |
32b4fe6a | 55 | \ |
39cfe8dd UD |
56 | /* Try the uname syscall */ \ |
57 | if (__uname (&uts)) \ | |
58 | { \ | |
59 | /* This was not successful. Now try reading the /proc \ | |
60 | filesystem. */ \ | |
61 | ssize_t reslen; \ | |
62 | int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); \ | |
63 | if (fd == -1 \ | |
64 | || (reslen = __read (fd, bufmem, sizeof (bufmem))) <= 0) \ | |
65 | /* This also didn't work. We give up since we cannot \ | |
66 | make sure the library can actually work. */ \ | |
67 | FATAL ("FATAL: cannot determine library version\n"); \ | |
68 | __close (fd); \ | |
17427edd | 69 | buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; \ |
32b4fe6a | 70 | } \ |
39cfe8dd UD |
71 | else \ |
72 | buf = uts.release; \ | |
32b4fe6a UD |
73 | \ |
74 | /* Now convert it into a number. The string consists of at most \ | |
75 | three parts. */ \ | |
76 | version = 0; \ | |
77 | parts = 0; \ | |
78 | cp = buf; \ | |
79 | while ((*cp >= '0') && (*cp <= '9')) \ | |
80 | { \ | |
81 | unsigned int here = *cp++ - '0'; \ | |
82 | \ | |
83 | while ((*cp >= '0') && (*cp <= '9')) \ | |
84 | { \ | |
85 | here *= 10; \ | |
86 | here += *cp++ - '0'; \ | |
87 | } \ | |
88 | \ | |
89 | ++parts; \ | |
90 | version <<= 8; \ | |
91 | version |= here; \ | |
92 | \ | |
93 | if (*cp++ != '.') \ | |
94 | /* Another part following? */ \ | |
95 | break; \ | |
96 | } \ | |
97 | \ | |
98 | if (parts < 3) \ | |
99 | version <<= 8 * (3 - parts); \ | |
100 | \ | |
101 | /* Now we can test with the required version. */ \ | |
102 | if (version < __LINUX_KERNEL_VERSION) \ | |
103 | /* Not sufficent. */ \ | |
104 | FATAL ("FATAL: kernel too old\n"); \ | |
a986484f UD |
105 | \ |
106 | _dl_osversion = version; \ | |
32b4fe6a UD |
107 | } \ |
108 | } while (0) |