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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [dl/] [dl-osinfo.h] - Rev 207
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/* Operating system specific code for generic dynamic loader functions. Copyright (C) 2000, 2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <string.h> #include <sys/sysctl.h> #include <sys/utsname.h> #include "kernel-features.h" #ifndef MIN # define MIN(a,b) (((a)<(b))?(a):(b)) #endif #ifdef SHARED /* This is the function used in the dynamic linker to print the fatal error message. */ static inline void __attribute__ ((__noreturn__)) dl_fatal (const char *str) { _dl_dprintf (2, str); _exit (1); } #endif #define DL_SYSDEP_OSCHECK(FATAL) \ do { \ /* Test whether the kernel is new enough. This test is only \ performed if the library is not compiled to run on all \ kernels. */ \ if (__LINUX_KERNEL_VERSION > 0) \ { \ char bufmem[64]; \ char *buf = bufmem; \ unsigned int version; \ int parts; \ char *cp; \ struct utsname uts; \ \ /* Try the uname syscall */ \ if (__uname (&uts)) \ { \ /* This was not successful. Now try reading the /proc \ filesystem. */ \ ssize_t reslen; \ int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); \ if (fd == -1 \ || (reslen = __read (fd, bufmem, sizeof (bufmem))) <= 0) \ /* This also didn't work. We give up since we cannot \ make sure the library can actually work. */ \ FATAL ("FATAL: cannot determine library version\n"); \ __close (fd); \ buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; \ } \ else \ buf = uts.release; \ \ /* Now convert it into a number. The string consists of at most \ three parts. */ \ version = 0; \ parts = 0; \ cp = buf; \ while ((*cp >= '0') && (*cp <= '9')) \ { \ unsigned int here = *cp++ - '0'; \ \ while ((*cp >= '0') && (*cp <= '9')) \ { \ here *= 10; \ here += *cp++ - '0'; \ } \ \ ++parts; \ version <<= 8; \ version |= here; \ \ if (*cp++ != '.') \ /* Another part following? */ \ break; \ } \ \ if (parts < 3) \ version <<= 8 * (3 - parts); \ \ /* Now we can test with the required version. */ \ if (version < __LINUX_KERNEL_VERSION) \ /* Not sufficent. */ \ FATAL ("FATAL: kernel too old\n"); \ \ _dl_osversion = version; \ } \ } while (0)