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52cea45760
* sysdeps/unix/sysv/linux/init-first.c (init): Remove personality call. It should not be necessary andis harmful for Alpha.
187 lines
5.1 KiB
C
187 lines
5.1 KiB
C
/* Initialization code run first thing by the ELF startup code. Linux version.
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Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include <fpu_control.h>
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#include <linux/personality.h>
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#include <init-first.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include "kernel-features.h"
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extern void __libc_init_secure (void);
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extern void __libc_init (int, char **, char **);
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extern void __libc_global_ctors (void);
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/* The function is called from assembly stubs the compiler can't see. */
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static void init (int, char **, char **) __attribute__ ((unused));
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/* The function we use to get the kernel revision. */
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extern int __sysctl (int *name, int nlen, void *oldval, size_t *oldlenp,
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void *newval, size_t newlen);
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extern int _dl_starting_up;
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weak_extern (_dl_starting_up)
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extern fpu_control_t _dl_fpu_control;
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extern int _dl_fpu_control_set;
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/* Set nonzero if we have to be prepared for more then one libc being
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used in the process. Safe assumption if initializer never runs. */
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int __libc_multiple_libcs = 1;
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/* Remember the command line argument and enviroment contents for
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later calls of initializers for dynamic libraries. */
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int __libc_argc;
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char **__libc_argv;
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static void
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init (int argc, char **argv, char **envp)
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{
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extern int __personality (int);
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extern void __getopt_clean_environment (char **);
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/* We must not call `personality' twice. */
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if (!__libc_multiple_libcs)
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{
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/* Test whether the kernel is new enough. This test is only
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performed if the library is not compiled to run on all
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kernels. */
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if (__LINUX_KERNEL_VERSION > 0)
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{
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static const int sysctl_args[] = { CTL_KERN, KERN_OSRELEASE };
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char buf[64];
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size_t reslen = sizeof (buf);
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unsigned int version;
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int parts;
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char *cp;
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/* Try reading the number using `sysctl' first. */
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if (__sysctl ((int *) sysctl_args,
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sizeof (sysctl_args) / sizeof (sysctl_args[0]),
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buf, &reslen, NULL, 0) < 0)
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{
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/* This was not successful. Now try reading the /proc
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filesystem. */
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int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY);
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if (fd == -1
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|| (reslen = __read (fd, buf, sizeof (buf))) <= 0)
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/* This also didn't work. We give up since we cannot
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make sure the library can actually work. */
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__libc_fatal ("FATAL: cannot determine library version\n");
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__close (fd);
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}
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buf[MIN (reslen, sizeof (buf) - 1)] = '\0';
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/* Now convert it into a number. The string consists of at most
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three parts. */
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version = 0;
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parts = 0;
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cp = buf;
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while ((*cp >= '0') && (*cp <= '9'))
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{
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unsigned int here = *cp++ - '0';
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while ((*cp >= '0') && (*cp <= '9'))
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{
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here *= 10;
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here += *cp++ - '0';
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}
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++parts;
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version <<= 8;
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version |= here;
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if (*cp++ != '.')
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/* Another part following? */
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break;
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}
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if (parts < 3)
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version <<= 8 * (3 - parts);
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/* Now we can test with the required version. */
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if (version < __LINUX_KERNEL_VERSION)
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/* Not sufficent. */
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__libc_fatal ("FATAL: kernel too old\n");
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}
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/* Set the FPU control word to the proper default value if the
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kernel would use a different value. (In a static program we
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don't have this information.) */
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#ifdef PIC
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if (__fpu_control != _dl_fpu_control)
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#endif
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__setfpucw (__fpu_control);
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}
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/* Save the command-line arguments. */
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__libc_argc = argc;
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__libc_argv = argv;
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__environ = envp;
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#ifndef PIC
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__libc_init_secure ();
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#endif
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__libc_init (argc, argv, envp);
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/* This is a hack to make the special getopt in GNU libc working. */
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__getopt_clean_environment (envp);
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#ifdef PIC
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__libc_global_ctors ();
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#endif
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}
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#ifdef PIC
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SYSDEP_CALL_INIT(_init, init);
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void
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__libc_init_first (void)
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{
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}
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#else
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void
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__libc_init_first (int argc, char **argv, char **envp)
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{
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init (argc, argv, envp);
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}
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#endif
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/* This function is defined here so that if this file ever gets into
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ld.so we will get a link error. Having this file silently included
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in ld.so causes disaster, because the _init definition above will
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cause ld.so to gain an init function, which is not a cool thing. */
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void
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_dl_start (void)
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{
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abort ();
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}
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