check_glibc_kernelversion.c (6207B)
1 /* 2 * Check the lz insn. 3 */ 4 5 #include <stdio.h> 6 #include <stdlib.h> 7 #include <stdint.h> 8 #include "sys.h" 9 10 #define __LINUX_KERNEL_VERSION 131584 11 12 #define DL_SYSDEP_OSCHECK(FATAL) \ 13 do { \ 14 /* Test whether the kernel is new enough. This test is only \ 15 performed if the library is not compiled to run on all \ 16 kernels. */ \ 17 if (__LINUX_KERNEL_VERSION > 0) \ 18 { \ 19 char bufmem[64]; \ 20 char *buf = bufmem; \ 21 unsigned int version; \ 22 int parts; \ 23 char *cp; \ 24 struct utsname uts; \ 25 \ 26 /* Try the uname syscall */ \ 27 if (__uname (&uts)) \ 28 { \ 29 /* This was not successful. Now try reading the /proc \ 30 filesystem. */ \ 31 ssize_t reslen; \ 32 int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); \ 33 if (fd == -1 \ 34 || (reslen = __read (fd, bufmem, sizeof (bufmem))) <= 0) \ 35 /* This also didn't work. We give up since we cannot \ 36 make sure the library can actually work. */ \ 37 FATAL ("FATAL: cannot determine library version\n"); \ 38 __close (fd); \ 39 buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; \ 40 } \ 41 else \ 42 buf = uts.release; \ 43 \ 44 /* Now convert it into a number. The string consists of at most \ 45 three parts. */ \ 46 version = 0; \ 47 parts = 0; \ 48 cp = buf; \ 49 while ((*cp >= '0') && (*cp <= '9')) \ 50 { \ 51 unsigned int here = *cp++ - '0'; \ 52 \ 53 while ((*cp >= '0') && (*cp <= '9')) \ 54 { \ 55 here *= 10; \ 56 here += *cp++ - '0'; \ 57 } \ 58 \ 59 ++parts; \ 60 version <<= 8; \ 61 version |= here; \ 62 \ 63 if (*cp++ != '.') \ 64 /* Another part following? */ \ 65 break; \ 66 } \ 67 \ 68 if (parts < 3) \ 69 version <<= 8 * (3 - parts); \ 70 \ 71 /* Now we can test with the required version. */ \ 72 if (version < __LINUX_KERNEL_VERSION) \ 73 /* Not sufficient. */ \ 74 FATAL ("FATAL: kernel too old\n"); \ 75 \ 76 _dl_osversion = version; \ 77 } \ 78 } while (0) 79 80 int main(void) 81 { 82 char bufmem[64] = "2.6.22"; 83 char *buf = bufmem; 84 unsigned int version; 85 int parts; 86 char *cp; 87 88 version = 0; 89 parts = 0; 90 cp = buf; 91 while ((*cp >= '0') && (*cp <= '9')) 92 { 93 unsigned int here = *cp++ - '0'; 94 95 while ((*cp >= '0') && (*cp <= '9')) 96 { 97 here *= 10; 98 here += *cp++ - '0'; 99 } 100 101 ++parts; 102 version <<= 8; 103 version |= here; 104 105 if (*cp++ != '.') 106 /* Another part following? */ 107 break; 108 } 109 110 if (parts < 3) 111 version <<= 8 * (3 - parts); 112 if (version < __LINUX_KERNEL_VERSION) 113 err(); 114 pass(); 115 exit(0); 116 }