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ladybird/Userland/Libraries/LibC/libcinit.cpp

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Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
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/*
LibC: Implement errno via a __errno_location() function This matches how some other systems implement errno, and makes 3rd party software that expect us to have __errno_location() work.
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
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*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
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*/
LibC: Move even more methods and globals out of crt0.o
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#include <AK/Types.h>
#include <assert.h>
LibC: Implement errno via a __errno_location() function This matches how some other systems implement errno, and makes 3rd party software that expect us to have __errno_location() work.
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#include <errno.h>
LibC: Avoid ninja-imports of system functions This adds a new header <sys/internals.h>, which provides access to LibC internals. This is in the interest of type-checking LibC itself, as well as enabling less-hacky access for uses like LinkDemo. And, of course, this progresses LibC towards building cleanly with -Wmissing-declarations.
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#include <sys/internals.h>
#include <unistd.h>
LibC: Move even more methods and globals out of crt0.o
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extern "C" {
LibC: Add NO_TLS preprocessor flag When this flag is defined, LibC does not use TLS. It will be useful for the dynamic loader.
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#ifdef NO_TLS
LibC: Implement errno via a __errno_location() function This matches how some other systems implement errno, and makes 3rd party software that expect us to have __errno_location() work.
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int errno_storage;
LibC: Add NO_TLS preprocessor flag When this flag is defined, LibC does not use TLS. It will be useful for the dynamic loader.
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#else
LibC: Implement errno via a __errno_location() function This matches how some other systems implement errno, and makes 3rd party software that expect us to have __errno_location() work.
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__thread int errno_storage;
LibC: Add NO_TLS preprocessor flag When this flag is defined, LibC does not use TLS. It will be useful for the dynamic loader.
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#endif
LibC: Move even more methods and globals out of crt0.o
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char** environ;
bool __environ_is_malloced;
LibC: Make it possible to use ASSERTs without initializing stdio
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bool __stdio_is_initialized;
LibCore+LibC: Enforce the global event loop ban in code It's a bad idea to have a global event loop in a client application as that will cause an initialization-order fiasco in ASAN. Therefore, LibC now has a flag "s_global_initializers_ran" which is false until _entry in crt0 runs, which in turn only gets called after all the global initializers were actually executed. The EventLoop constructor checks the flag and crashes the program if it is being called as a global constructor. A note next to the VERIFY_NOT_REACHED() informs the developer of these things and how we usually instantiate event loops. The upshot of this is that global event loops will cause a crash before any undefined behavior is hit.
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bool s_global_initializers_ran;
LibC+DynamicLoader: Store the auxiliary vector address at startup Previously, getauxval() got the address of the auxiliary vector by traversing to the end of the `environ` pointer. The assumption that the auxiliary vector comes after the environment array is true at program startup, however the environment array may be re-allocated and change its address during runtime which would cause getauxval() to work with an incorrect auxiliary vector address. To fix this, we now get the address of the auxiliary vector once in __libc_init and store it in a libc-internal pointer which is then used by getauxval(). Fixes #10087.
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void* __auxiliary_vector;
static void __auxiliary_vector_init();
LibC: Move even more methods and globals out of crt0.o
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LibC: Implement errno via a __errno_location() function This matches how some other systems implement errno, and makes 3rd party software that expect us to have __errno_location() work.
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int* __errno_location()
{
return &errno_storage;
}
LibC: Move even more methods and globals out of crt0.o
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void __libc_init()
{
LibC+DynamicLoader: Store the auxiliary vector address at startup Previously, getauxval() got the address of the auxiliary vector by traversing to the end of the `environ` pointer. The assumption that the auxiliary vector comes after the environment array is true at program startup, however the environment array may be re-allocated and change its address during runtime which would cause getauxval() to work with an incorrect auxiliary vector address. To fix this, we now get the address of the auxiliary vector once in __libc_init and store it in a libc-internal pointer which is then used by getauxval(). Fixes #10087.
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__auxiliary_vector_init();
LibC: Move even more methods and globals out of crt0.o
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__malloc_init();
__stdio_init();
}
LibC+DynamicLoader: Store the auxiliary vector address at startup Previously, getauxval() got the address of the auxiliary vector by traversing to the end of the `environ` pointer. The assumption that the auxiliary vector comes after the environment array is true at program startup, however the environment array may be re-allocated and change its address during runtime which would cause getauxval() to work with an incorrect auxiliary vector address. To fix this, we now get the address of the auxiliary vector once in __libc_init and store it in a libc-internal pointer which is then used by getauxval(). Fixes #10087.
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static void __auxiliary_vector_init()
{
char** env;
for (env = environ; *env; ++env) {
}
__auxiliary_vector = (void*)++env;
}
LibC: Move even more methods and globals out of crt0.o
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}
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