96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
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/* libccrt0.cc: crt0 for libc [newlib calls this one]
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Copyright 1996, 1998, 1999, 2000 Cygnus Solutions.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#undef MALLOC_DEBUG
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#include "winsup.h"
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#include <reent.h>
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#include <stdlib.h>
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typedef int (*MainFunc) (int argc, char *argc[], char **env);
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extern "C"
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{
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char **environ;
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void cygwin_crt0 (MainFunc);
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int cygwin_attach_dll (HMODULE, MainFunc);
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int cygwin_attach_noncygwin_dll (HMODULE, MainFunc);
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int main (int, char **, char **);
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struct _reent *_impure_ptr;
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int _fmode;
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};
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static per_process this_proc;
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/* Set up pointers to various pieces so the dll can then use them,
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and then jump to the dll. */
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static void
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cygwin_crt0_common (MainFunc f)
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{
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/* This is used to record what the initial sp was. The value is needed
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when copying the parent's stack to the child during a fork. */
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int onstack;
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/* The version numbers are the main source of compatibility checking.
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As a backup to them, we use the size of the per_process struct. */
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this_proc.magic_biscuit = sizeof (per_process);
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/* cygwin.dll version number in effect at the time the app was created. */
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this_proc.dll_major = CYGWIN_VERSION_DLL_MAJOR;
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this_proc.dll_minor = CYGWIN_VERSION_DLL_MINOR;
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this_proc.api_major = CYGWIN_VERSION_API_MAJOR;
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this_proc.api_minor = CYGWIN_VERSION_API_MINOR;
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this_proc.ctors = &__CTOR_LIST__;
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this_proc.dtors = &__DTOR_LIST__;
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this_proc.envptr = &environ;
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this_proc.impure_ptr_ptr = &_impure_ptr;
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this_proc.main = f;
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this_proc.fmode_ptr = &_fmode;
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this_proc.initial_sp = (char *) &onstack;
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/* Remember whatever the user linked his application with - or
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point to entries in the dll. */
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this_proc.malloc = &malloc;
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this_proc.free = &free;
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this_proc.realloc = &realloc;
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this_proc.calloc = &calloc;
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/* Setup the module handle so fork can get the path name. */
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this_proc.hmodule = GetModuleHandle (0);
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/* variables for fork */
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this_proc.data_start = &_data_start__;
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this_proc.data_end = &_data_end__;
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this_proc.bss_start = &_bss_start__;
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this_proc.bss_end = &_bss_end__;
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}
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/* for main module */
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void
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cygwin_crt0 (MainFunc f)
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{
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cygwin_crt0_common (f);
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/* Jump into the dll. */
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dll_crt0 (&this_proc);
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}
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/* for a loaded dll */
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int
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cygwin_attach_dll (HMODULE h, MainFunc f)
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{
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cygwin_crt0_common (f);
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/* jump into the dll. */
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return dll_dllcrt0 (h, &this_proc);
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}
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