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cf197e41e7
2000-04-02 Ulrich Drepper <drepper@redhat.com> * elf/dl-fini.c (_dl_fini): Increment j counter after swapping in element at this position. * elf/Versions [ld.so] (GLIBC_2.2): Export _dl_load_lock. * elf/link.h (struct link_map): Add l_reldepsmax, l_reldepsact, and l_reldeps elements. * elf/dl-lookup.c (add_dependency): New function. (_dl_lookup_symbol): Use it whenever symbol was found in a global, dynamically loaded object. (_dl_lookup_symbol_skip): Likewise. (_dl_lookup_versioned_symbol): Likewise. (_dl_lookup_versioned_symbol_skip): Likewise. * elf/dl-open.c: Don't define _dl_load_lock here... * elf/rtld.c: ...but here... * elf/dl-support.c: ...and here. * elf/dl-close.c (_dl_close): Close also dependent objects introduce through relocation. * elf/dl-fini.c (_dl_fini): Also take dependencies introduced through relocations. * dlfcn/Makefile (glrefmain.out): Test is not expected to fail anymore. * dlfcn/glrefmain.c: Add one more debug message. * Makeconfig (preprocess-versions): Don't add $(CPPFLAGS) to compiler command line. * Makerules (sysd-versions): Use ( ) instead of { }. * elf/dl-load.c: Use __builtin_expect to signal that compiler should optimize for the non-debugging case. * elf/dl-lookup.c: Likewise. * sysdeps/generic/libc-start.c: Likewise.
121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/* Copyright (C) 1998, 1999, 2000 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 <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <ldsodefs.h>
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extern void __libc_init_first (int argc, char **argv, char **envp);
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extern int _dl_starting_up;
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weak_extern (_dl_starting_up)
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extern int __libc_multiple_libcs;
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extern void *__libc_stack_end;
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/* Prototype for local function. */
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static void check_standard_fds (void);
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int
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__libc_start_main (int (*main) (int, char **, char **), int argc,
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char **argv, void (*init) (void), void (*fini) (void),
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void (*rtld_fini) (void), void *stack_end)
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{
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#ifndef SHARED
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/* The next variable is only here to work around a bug in gcc <= 2.7.2.2.
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If the address would be taken inside the expression the optimizer
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would try to be too smart and throws it away. Grrr. */
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int *dummy_addr = &_dl_starting_up;
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__libc_multiple_libcs = dummy_addr && !_dl_starting_up;
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#endif
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/* Store the lowest stack address. */
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__libc_stack_end = stack_end;
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/* Set the global _environ variable correctly. */
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__environ = &argv[argc + 1];
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/* Some security at this point. Prevent starting a SUID binary where
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the standard file descriptors are not opened. */
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if (__builtin_expect (__libc_enable_secure, 0))
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check_standard_fds ();
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/* Register the destructor of the dynamic linker if there is any. */
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if (__builtin_expect (rtld_fini != NULL, 1))
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atexit (rtld_fini);
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/* Call the initializer of the libc. This is only needed here if we
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are compiling for the static library in which case we haven't
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run the constructors in `_dl_start_user'. */
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#ifndef SHARED
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__libc_init_first (argc, argv, __environ);
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#endif
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/* Register the destructor of the program, if any. */
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if (fini)
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atexit (fini);
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/* Call the initializer of the program, if any. */
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#ifdef SHARED
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if (__builtin_expect (_dl_debug_impcalls, 0))
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_dl_debug_message (1, "\ninitialize program: ", argv[0], "\n\n", NULL);
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#endif
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if (init)
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(*init) ();
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#ifdef SHARED
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if (__builtin_expect (_dl_debug_impcalls, 0))
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_dl_debug_message (1, "\ntransferring control: ", argv[0], "\n\n", NULL);
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#endif
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exit ((*main) (argc, argv, __environ));
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}
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/* Should other OSes (e.g., Hurd) have different versions which can
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be written in a better way? */
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static void
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check_one_fd (int fd, int mode)
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{
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if (__libc_fcntl (fd, F_GETFD) == -1 && errno == EBADF)
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{
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/* Something is wrong with this descriptor, it's probably not
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opened. Open /dev/null so that the SUID program we are
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about to start does not accidently use this descriptor. */
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int nullfd = __libc_open (_PATH_DEVNULL, mode);
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if (nullfd == -1)
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/* We cannot even give an error message here since it would
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run into the same problems. */
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abort ();
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}
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}
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static void
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check_standard_fds (void)
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{
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/* Check all three standard file descriptors. */
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check_one_fd (STDIN_FILENO, O_RDONLY);
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check_one_fd (STDOUT_FILENO, O_RDWR);
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check_one_fd (STDERR_FILENO, O_RDWR);
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}
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