/* dcrt0.cc -- essentially the main() for the Cygwin dll Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Red Hat, Inc. This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include "miscfuncs.h" #include #include #include "glob.h" #include #include #include "environ.h" #include "sigproc.h" #include "pinfo.h" #include "cygerrno.h" #define NEED_VFORK #include "perprocess.h" #include "path.h" #include "fhandler.h" #include "dtable.h" #include "cygheap.h" #include "child_info_magic.h" #include "cygtls.h" #include "shared_info.h" #include "cygwin_version.h" #include "dll_init.h" #include "heap.h" #include "tls_pbuf.h" #include "exception.h" #include "cygxdr.h" #include "fenv.h" #include "ntdll.h" #include "wow64.h" #define MAX_AT_FILE_LEVEL 10 #define PREMAIN_LEN (sizeof (user_data->premain) / sizeof (user_data->premain[0])) extern "C" void cygwin_exit (int) __attribute__ ((noreturn)); extern "C" void __sinit (_reent *); static int NO_COPY envc; static char NO_COPY **envp; bool NO_COPY jit_debug; static void do_global_dtors () { void (**pfunc) () = user_data->dtors; if (pfunc) { user_data->dtors = NULL; while (*++pfunc) (*pfunc) (); } } static void __stdcall do_global_ctors (void (**in_pfunc)(), int force) { if (!force && in_forkee) return; // inherit constructed stuff from parent pid /* Run ctors backwards, so skip the first entry and find how many there are, then run them. */ void (**pfunc) () = in_pfunc; while (*++pfunc) ; while (--pfunc > in_pfunc) (*pfunc) (); } /* * Replaces @file in the command line with the contents of the file. * There may be multiple @file's in a single command line * A \@file is replaced with @file so that echo \@foo would print * @foo and not the contents of foo. */ static bool __stdcall insert_file (char *name, char *&cmd) { HANDLE f; DWORD size; tmp_pathbuf tp; PWCHAR wname = tp.w_get (); sys_mbstowcs (wname, NT_MAX_PATH, name + 1); f = CreateFileW (wname, GENERIC_READ, /* open for reading */ FILE_SHARE_VALID_FLAGS, /* share for reading */ &sec_none_nih, /* default security */ OPEN_EXISTING, /* existing file only */ FILE_ATTRIBUTE_NORMAL, /* normal file */ NULL); /* no attr. template */ if (f == INVALID_HANDLE_VALUE) { debug_printf ("couldn't open file '%s', %E", name); return false; } /* This only supports files up to about 4 billion bytes in size. I am making the bold assumption that this is big enough for this feature */ size = GetFileSize (f, NULL); if (size == 0xFFFFFFFF) { debug_printf ("couldn't get file size for '%s', %E", name); return false; } int new_size = strlen (cmd) + size + 2; char *tmp = (char *) malloc (new_size); if (!tmp) { debug_printf ("malloc failed, %E"); return false; } /* realloc passed as it should */ DWORD rf_read; BOOL rf_result; rf_result = ReadFile (f, tmp, size, &rf_read, NULL); CloseHandle (f); if (!rf_result || (rf_read != size)) { debug_printf ("ReadFile failed, %E"); return false; } tmp[size++] = ' '; strcpy (tmp + size, cmd); cmd = tmp; return true; } static inline int isquote (char c) { char ch = c; return ch == '"' || ch == '\''; } /* Step over a run of characters delimited by quotes */ static /*__inline*/ char * quoted (char *cmd, int winshell) { char *p; char quote = *cmd; if (!winshell) { char *p; strcpy (cmd, cmd + 1); if (*(p = strchrnul (cmd, quote))) strcpy (p, p + 1); return p; } const char *s = quote == '\'' ? "'" : "\\\""; /* This must have been run from a Windows shell, so preserve quotes for globify to play with later. */ while (*cmd && *++cmd) if ((p = strpbrk (cmd, s)) == NULL) { cmd = strchr (cmd, '\0'); // no closing quote break; } else if (*p == '\\') cmd = ++p; else if (quote == '"' && p[1] == '"') { *p = '\\'; cmd = ++p; // a quoted quote } else { cmd = p + 1; // point to after end break; } return cmd; } /* Perform a glob on word if it contains wildcard characters. Also quote every character between quotes to force glob to treat the characters literally. */ /* Either X:[...] or \\server\[...] */ #define is_dos_path(s) (isdrive(s) \ || ((s)[0] == '\\' \ && (s)[1] == '\\' \ && isalpha ((s)[2]) \ && strchr ((s) + 3, '\\'))) static int __stdcall globify (char *word, char **&argv, int &argc, int &argvlen) { if (*word != '~' && strpbrk (word, "?*[\"\'(){}") == NULL) return 0; int n = 0; char *p, *s; int dos_spec = is_dos_path (word); if (!dos_spec && isquote (*word) && word[1] && word[2]) dos_spec = is_dos_path (word + 1); /* We'll need more space if there are quoting characters in word. If that is the case, doubling the size of the string should provide more than enough space. */ if (strpbrk (word, "'\"")) n = strlen (word); char pattern[strlen (word) + ((dos_spec + 1) * n) + 1]; /* Fill pattern with characters from word, quoting any characters found within quotes. */ for (p = pattern, s = word; *s != '\000'; s++, p++) if (!isquote (*s)) { if (dos_spec && *s == '\\') *p++ = '\\'; *p = *s; } else { char quote = *s; while (*++s && *s != quote) { if (dos_spec || *s != '\\') /* nothing */; else if (s[1] == quote || s[1] == '\\') s++; *p++ = '\\'; size_t cnt = isascii (*s) ? 1 : mbtowc (NULL, s, MB_CUR_MAX); if (cnt <= 1 || cnt == (size_t)-1) *p++ = *s; else { --s; while (cnt-- > 0) *p++ = *++s; } } if (*s == quote) p--; if (*s == '\0') break; } *p = '\0'; glob_t gl; gl.gl_offs = 0; /* Attempt to match the argument. Return just word (minus quoting) if no match. */ if (glob (pattern, GLOB_TILDE | GLOB_NOCHECK | GLOB_BRACE | GLOB_QUOTE, NULL, &gl) || !gl.gl_pathc) return 0; /* Allocate enough space in argv for the matched filenames. */ n = argc; if ((argc += gl.gl_pathc) > argvlen) { argvlen = argc + 10; argv = (char **) realloc (argv, (1 + argvlen) * sizeof (argv[0])); } /* Copy the matched filenames to argv. */ char **gv = gl.gl_pathv; char **av = argv + n; while (*gv) { debug_printf ("argv[%d] = '%s'", n++, *gv); *av++ = *gv++; } /* Clean up after glob. */ free (gl.gl_pathv); return 1; } /* Build argv, argc from string passed from Windows. */ static void __stdcall build_argv (char *cmd, char **&argv, int &argc, int winshell) { int argvlen = 0; int nesting = 0; // monitor "nesting" from insert_file argc = 0; argvlen = 0; argv = NULL; /* Scan command line until there is nothing left. */ while (*cmd) { /* Ignore spaces */ if (issep (*cmd)) { cmd++; continue; } /* Found the beginning of an argument. */ char *word = cmd; char *sawquote = NULL; while (*cmd) { if (*cmd != '"' && (!winshell || *cmd != '\'')) cmd++; // Skip over this character else /* Skip over characters until the closing quote */ { sawquote = cmd; /* Handle quoting. Only strip off quotes if the parent is a Cygwin process, or if the word starts with a '@'. In this case, the insert_file function needs an unquoted DOS filename and globbing isn't performed anyway. */ cmd = quoted (cmd, winshell && argc > 0 && *word != '@'); } if (issep (*cmd)) // End of argument if space break; } if (*cmd) *cmd++ = '\0'; // Terminate `word' /* Possibly look for @file construction assuming that this isn't the very first argument and the @ wasn't quoted */ if (argc && sawquote != word && *word == '@') { if (++nesting > MAX_AT_FILE_LEVEL) api_fatal ("Too many levels of nesting for %s", word); if (insert_file (word, cmd)) continue; // There's new stuff in cmd now } /* See if we need to allocate more space for argv */ if (argc >= argvlen) { argvlen = argc + 10; argv = (char **) realloc (argv, (1 + argvlen) * sizeof (argv[0])); } /* Add word to argv file after (optional) wildcard expansion. */ if (!winshell || !argc || !globify (word, argv, argc, argvlen)) { debug_printf ("argv[%d] = '%s'", argc, word); argv[argc++] = word; } } if (argv) argv[argc] = NULL; debug_printf ("argc %d", argc); } /* sanity and sync check */ void __stdcall check_sanity_and_sync (per_process *p) { /* Sanity check to make sure developers didn't change the per_process */ /* struct without updating SIZEOF_PER_PROCESS [it makes them think twice */ /* about changing it]. */ if (sizeof (per_process) != SIZEOF_PER_PROCESS) api_fatal ("per_process sanity check failed"); /* Make sure that the app and the dll are in sync. */ /* Complain if older than last incompatible change */ if (p->dll_major < CYGWIN_VERSION_DLL_EPOCH) api_fatal ("cygwin DLL and APP are out of sync -- DLL version mismatch %u < %u", p->dll_major, CYGWIN_VERSION_DLL_EPOCH); /* magic_biscuit != 0 if using the old style version numbering scheme. */ if (p->magic_biscuit != SIZEOF_PER_PROCESS) api_fatal ("Incompatible cygwin .dll -- incompatible per_process info %u != %u", p->magic_biscuit, SIZEOF_PER_PROCESS); /* Complain if incompatible API changes made */ if (p->api_major > cygwin_version.api_major) api_fatal ("cygwin DLL and APP are out of sync -- API version mismatch %u > %u", p->api_major, cygwin_version.api_major); /* This is a kludge to work around a version of _cygwin_common_crt0 which overwrote the cxx_malloc field with the local DLL copy. Hilarity ensues if the DLL is not loaded while the process is forking. */ __cygwin_user_data.cxx_malloc = &default_cygwin_cxx_malloc; } child_info NO_COPY *child_proc_info; #define CYGWIN_GUARD (PAGE_READWRITE | PAGE_GUARD) void child_info_fork::alloc_stack_hard_way (volatile char *b) { void *stack_ptr; SIZE_T stacksize; /* First check if the requested stack area is part of the user heap or part of a mmapped region. If so, we have been started from a pthread with an application-provided stack, and the stack has just to be used as is. */ if ((stacktop >= cygheap->user_heap.base && stackbottom <= cygheap->user_heap.max) || is_mmapped_region ((caddr_t) stacktop, (caddr_t) stackbottom)) return; /* First, try to reserve the entire stack. */ stacksize = (SIZE_T) stackbottom - (SIZE_T) stackaddr; if (!VirtualAlloc (stackaddr, stacksize, MEM_RESERVE, PAGE_NOACCESS)) { PTEB teb = NtCurrentTeb (); api_fatal ("fork: can't reserve memory for parent stack " "%p - %p, (child has %p - %p), %E", stackaddr, stackbottom, teb->DeallocationStack, _tlsbase); } stacksize = (SIZE_T) stackbottom - (SIZE_T) stacktop; stack_ptr = VirtualAlloc (stacktop, stacksize, MEM_COMMIT, PAGE_READWRITE); if (!stack_ptr) abort ("can't commit memory for stack %p(%ly), %E", stacktop, stacksize); if (guardsize != (size_t) -1) { /* Allocate PAGE_GUARD page if it still fits. */ if (stack_ptr > stackaddr) { stack_ptr = (void *) ((LPBYTE) stack_ptr - wincap.page_size ()); if (!VirtualAlloc (stack_ptr, wincap.page_size (), MEM_COMMIT, CYGWIN_GUARD)) api_fatal ("fork: couldn't allocate new stack guard page %p, %E", stack_ptr); } /* Allocate POSIX guard pages. */ if (guardsize > 0) VirtualAlloc (stackaddr, guardsize, MEM_COMMIT, PAGE_NOACCESS); } b[0] = '\0'; } void *getstack (void *) __attribute__ ((noinline)); volatile char * getstack (volatile char * volatile p) { *p ^= 1; *p ^= 1; return p - 4096; } /* extend the stack prior to fork longjmp */ void child_info_fork::alloc_stack () { volatile char * volatile stackp; #ifdef __x86_64__ __asm__ volatile ("movq %%rsp,%0": "=r" (stackp)); #else __asm__ volatile ("movl %%esp,%0": "=r" (stackp)); #endif /* Make sure not to try a hard allocation if we have been forked off from the main thread of a Cygwin process which has been started from a 64 bit parent. In that case the _tlsbase of the forked child is not the same as the _tlsbase of the parent (== stackbottom), but only because the stack of the parent has been slightly rearranged. See comment in wow64_revert_to_original_stack for details. We check here if the parent stack fits into the child stack. */ if (_tlsbase != stackbottom && (!wincap.is_wow64 () || stacktop < (char *) NtCurrentTeb ()->DeallocationStack || stackbottom > _tlsbase)) alloc_stack_hard_way (stackp); else { char *st = (char *) stacktop; while (_tlstop > st) stackp = getstack (stackp); stackaddr = 0; /* This only affects forked children of a process started from a native 64 bit process, but it doesn't hurt to do it unconditionally. Fix StackBase in the child to be the same as in the parent, so that the computation of _my_tls is correct. */ _tlsbase = (PVOID) stackbottom; } } extern "C" void break_here () { static int NO_COPY sent_break; if (!sent_break++) DebugBreak (); debug_printf ("break here"); } static void initial_env () { if (GetEnvironmentVariableA ("CYGWIN_TESTING", NULL, 0)) _cygwin_testing = 1; #ifdef DEBUGGING char buf[NT_MAX_PATH]; if (GetEnvironmentVariableA ("CYGWIN_DEBUG", buf, sizeof (buf) - 1)) { char buf1[NT_MAX_PATH]; GetModuleFileName (NULL, buf1, NT_MAX_PATH); strlwr (buf1); strlwr (buf); char *p = strpbrk (buf, ":="); if (!p) p = (char *) "gdb.exe -nw"; else *p++ = '\0'; if (strstr (buf1, buf)) { error_start_init (p); jit_debug = true; try_to_debug (); console_printf ("*** Sending Break. gdb may issue spurious SIGTRAP message.\n"); break_here (); } } #endif } child_info * get_cygwin_startup_info () { STARTUPINFO si; GetStartupInfo (&si); child_info *res = (child_info *) si.lpReserved2; if (si.cbReserved2 < EXEC_MAGIC_SIZE || !res || res->intro != PROC_MAGIC_GENERIC || res->magic != CHILD_INFO_MAGIC) { strace.activate (false); res = NULL; } else { if ((res->intro & OPROC_MAGIC_MASK) == OPROC_MAGIC_GENERIC) multiple_cygwin_problem ("proc intro", res->intro, 0); else if (res->cygheap != (void *) &_cygheap_start) multiple_cygwin_problem ("cygheap base", (uintptr_t) res->cygheap, (uintptr_t) &_cygheap_start); unsigned should_be_cb = 0; switch (res->type) { case _CH_FORK: in_forkee = true; should_be_cb = sizeof (child_info_fork); /* fall through */; case _CH_SPAWN: case _CH_EXEC: if (!should_be_cb) should_be_cb = sizeof (child_info_spawn); if (should_be_cb != res->cb) multiple_cygwin_problem ("proc size", res->cb, should_be_cb); else if (sizeof (fhandler_union) != res->fhandler_union_cb) multiple_cygwin_problem ("fhandler size", res->fhandler_union_cb, sizeof (fhandler_union)); if (res->isstraced ()) { while (!being_debugged ()) yield (); strace.activate (res->type == _CH_FORK); } break; default: system_printf ("unknown exec type %u", res->type); /* intentionally fall through */ case _CH_WHOOPS: res = NULL; break; } } return res; } #ifdef __x86_64__ #define dll_data_start &__data_start__ #define dll_data_end &__data_end__ #define dll_bss_start &__bss_start__ #define dll_bss_end &__bss_end__ #else #define dll_data_start &_data_start__ #define dll_data_end &_data_end__ #define dll_bss_start &_bss_start__ #define dll_bss_end &_bss_end__ #endif void child_info_fork::handle_fork () { cygheap_fixup_in_child (false); memory_init (false); myself.thisproc (NULL); myself->uid = cygheap->user.real_uid; myself->gid = cygheap->user.real_gid; child_copy (parent, false, "dll data", dll_data_start, dll_data_end, "dll bss", dll_bss_start, dll_bss_end, "user heap", cygheap->user_heap.base, cygheap->user_heap.ptr, NULL); /* If my_wr_proc_pipe != NULL then it's a leftover handle from a previously forked process. Close it now or suffer confusion with the parent of our parent. */ if (my_wr_proc_pipe) ForceCloseHandle1 (my_wr_proc_pipe, wr_proc_pipe); /* Setup our write end of the process pipe. Clear the one in the structure. The destructor should never be called for this but, it can't hurt to be safe. */ my_wr_proc_pipe = wr_proc_pipe; rd_proc_pipe = wr_proc_pipe = NULL; /* Do the relocations here. These will actually likely be overwritten by the below child_copy but we do them here in case there is a read-only section which does not get copied by fork. */ _pei386_runtime_relocator (user_data); /* step 2 now that the dll has its heap filled in, we can fill in the user's data and bss since user_data is now filled out. */ child_copy (parent, false, "data", user_data->data_start, user_data->data_end, "bss", user_data->bss_start, user_data->bss_end, NULL); if (fixup_mmaps_after_fork (parent)) api_fatal ("recreate_mmaps_after_fork_failed"); } bool child_info_spawn::get_parent_handle () { parent = OpenProcess (PROCESS_VM_READ, false, parent_winpid); moreinfo->myself_pinfo = NULL; return !!parent; } void child_info_spawn::handle_spawn () { extern void fixup_lockf_after_exec (); HANDLE h; if (!dynamically_loaded || get_parent_handle ()) { cygheap_fixup_in_child (true); memory_init (false); } if (!moreinfo->myself_pinfo || !DuplicateHandle (GetCurrentProcess (), moreinfo->myself_pinfo, GetCurrentProcess (), &h, 0, FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE)) h = NULL; /* Setup our write end of the process pipe. Clear the one in the structure. The destructor should never be called for this but, it can't hurt to be safe. */ my_wr_proc_pipe = wr_proc_pipe; rd_proc_pipe = wr_proc_pipe = NULL; myself.thisproc (h); __argc = moreinfo->argc; __argv = moreinfo->argv; envp = moreinfo->envp; envc = moreinfo->envc; if (!dynamically_loaded) cygheap->fdtab.fixup_after_exec (); if (__stdin >= 0) cygheap->fdtab.move_fd (__stdin, 0); if (__stdout >= 0) cygheap->fdtab.move_fd (__stdout, 1); cygheap->user.groups.clear_supp (); /* If we're execing we may have "inherited" a list of children forked by the previous process executing under this pid. Reattach them here so that we can wait for them. */ if (type == _CH_EXEC) reattach_children (); ready (true); /* Keep pointer to parent open if we've execed so that pid will not be reused. Otherwise, we no longer need this handle so close it. Need to do this after debug_fixup_after_fork_exec or DEBUGGING handling of handles might get confused. */ if (type != _CH_EXEC && child_proc_info->parent) { CloseHandle (child_proc_info->parent); child_proc_info->parent = NULL; } signal_fixup_after_exec (); fixup_lockf_after_exec (); } /* Retrieve and store system directory for later use. Note that the directory is stored with a trailing backslash! */ static void init_windows_system_directory () { if (!windows_system_directory_length) { windows_system_directory_length = GetSystemDirectoryW (windows_system_directory, MAX_PATH); if (windows_system_directory_length == 0) api_fatal ("can't find windows system directory"); windows_system_directory[windows_system_directory_length++] = L'\\'; windows_system_directory[windows_system_directory_length] = L'\0'; #ifndef __x86_64__ system_wow64_directory_length = GetSystemWow64DirectoryW (system_wow64_directory, MAX_PATH); if (system_wow64_directory_length) { system_wow64_directory[system_wow64_directory_length++] = L'\\'; system_wow64_directory[system_wow64_directory_length] = L'\0'; } #endif /* !__x86_64__ */ } } void dll_crt0_0 () { wincap.init (); child_proc_info = get_cygwin_startup_info (); init_windows_system_directory (); initial_env (); SetErrorMode (SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX); lock_process::init (); _impure_ptr = _GLOBAL_REENT; _impure_ptr->_stdin = &_impure_ptr->__sf[0]; _impure_ptr->_stdout = &_impure_ptr->__sf[1]; _impure_ptr->_stderr = &_impure_ptr->__sf[2]; _impure_ptr->_current_locale = "C"; user_data->impure_ptr = _impure_ptr; user_data->impure_ptr_ptr = &_impure_ptr; DuplicateHandle (GetCurrentProcess (), GetCurrentThread (), GetCurrentProcess (), &hMainThread, 0, false, DUPLICATE_SAME_ACCESS); NtOpenProcessToken (NtCurrentProcess (), MAXIMUM_ALLOWED, &hProcToken); set_cygwin_privileges (hProcToken); device::init (); do_global_ctors (&__CTOR_LIST__, 1); cygthread::init (); if (!child_proc_info) { memory_init (true); #ifndef __x86_64__ /* WOW64 process on XP/64 or Server 2003/64? Check if we have been started from 64 bit process and if our stack is at an unusual address. Set wow64_needs_stack_adjustment if so. Problem description in wow64_test_for_64bit_parent. */ if (wincap.wow64_has_secondary_stack ()) wow64_needs_stack_adjustment = wow64_test_for_64bit_parent (); #endif /* !__x86_64__ */ } else { cygwin_user_h = child_proc_info->user_h; switch (child_proc_info->type) { case _CH_FORK: fork_info->handle_fork (); break; case _CH_SPAWN: case _CH_EXEC: spawn_info->handle_spawn (); break; } } user_data->threadinterface->Init (); _main_tls = &_my_tls; /* Initialize signal processing here, early, in the hopes that the creation of a thread early in the process will cause more predictability in memory layout for the main thread. */ if (!dynamically_loaded) sigproc_init (); debug_printf ("finished dll_crt0_0 initialization"); } static inline void main_thread_sinit () { __sinit (_impure_ptr); /* At this point, _impure_ptr == _global_impure_ptr == _GLOBAL_REENT is initialized, but _REENT == _my_tls.local_clib doesn't know about it. It has been copied over from _GLOBAL_REENT in _cygtls::init_thread *before* the initialization took place. As soon as the main thread calls a stdio function, this would be rectified. But if another thread calls a stdio function on stdin/out/err before the main thread does, all the required initialization of stdin/out/err will be done, but _REENT->__sdidinit is *still* 0. This in turn will result in a call to __sinit in the wrong spot. The input or output buffer will be NULLed and nothing is read or written in the first stdio function call in the main thread. To fix this issue we have to copy over the relevant part of _GLOBAL_REENT to _REENT here again. */ _REENT->__sdidinit = -1; _REENT->__cleanup = _GLOBAL_REENT->__cleanup; } /* Take over from libc's crt0.o and start the application. Note the various special cases when Cygwin DLL is being runtime loaded (as opposed to being link-time loaded by Cygwin apps) from a non cygwin app via LoadLibrary. */ void dll_crt0_1 (void *) { extern void initial_setlocale (); _my_tls.incyg++; /* Inherit "parent" exec'ed process sigmask */ if (spawn_info && !in_forkee) _my_tls.sigmask = spawn_info->moreinfo->sigmask; if (dynamically_loaded) sigproc_init (); check_sanity_and_sync (user_data); /* Initialize malloc and then call user_shared_initialize since it relies on a functioning malloc and it's possible that the user's program may have overridden malloc. We only know about that at this stage, unfortunately. */ malloc_init (); user_shared->initialize (); #ifdef CYGHEAP_DEBUG int i = 0; const int n = 2 * 1024 * 1024; while (i--) { void *p = cmalloc (HEAP_STR, n); if (p) small_printf ("cmalloc returns %p\n", cmalloc (HEAP_STR, n)); else { small_printf ("total allocated %y\n", (i - 1) * n); break; } } #endif ProtectHandle (hMainThread); cygheap->cwd.init (); /* Initialize pthread mainthread when not forked and it is safe to call new, otherwise it is reinitalized in fixup_after_fork */ if (!in_forkee) { pthread::init_mainthread (); _pei386_runtime_relocator (user_data); } #ifdef DEBUGGING strace.microseconds (); #endif /* Initialize debug muto, if DLL is built with --enable-debugging. Need to do this before any helper threads start. */ debug_init (); #ifdef NEWVFORK cygheap->fdtab.vfork_child_fixup (); main_vfork = vfork_storage.create (); #endif cygbench ("pre-forkee"); if (in_forkee) { /* If we've played with the stack, stacksize != 0. That means that fork() was invoked from other than the main thread. Make sure that frame pointer is referencing the new stack so that the OS knows what to do when it needs to increase the size of the stack. NOTE: Don't do anything that involves the stack until you've completed this step. */ if (fork_info->stackaddr) { _tlsbase = (PVOID) fork_info->stackbottom; _tlstop = (PVOID) fork_info->stacktop; } /* Not resetting _my_tls.incyg here because presumably fork will overwrite it with the value of the forker and all will be good. */ longjmp (fork_info->jmp, true); } main_thread_sinit (); #ifdef DEBUGGING { extern void fork_init (); fork_init (); } #endif pinfo_init (envp, envc); strace.dll_info (); /* Allocate cygheap->fdtab */ dtable_init (); uinfo_init (); /* initialize user info */ /* Connect to tty. */ tty::init_session (); /* Set internal locale to the environment settings. */ initial_setlocale (); if (!__argc) { PWCHAR wline = GetCommandLineW (); size_t size = sys_wcstombs (NULL, 0, wline); char *line = (char *) alloca (size); sys_wcstombs (line, size, wline); /* Scan the command line and build argv. Expand wildcards if not called from another cygwin process. */ build_argv (line, __argv, __argc, NOTSTATE (myself, PID_CYGPARENT) && allow_glob); /* Convert argv[0] to posix rules if it's currently blatantly win32 style. */ if ((strchr (__argv[0], ':')) || (strchr (__argv[0], '\\'))) { char *new_argv0 = (char *) malloc (NT_MAX_PATH); cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_RELATIVE, __argv[0], new_argv0, NT_MAX_PATH); __argv[0] = (char *) realloc (new_argv0, strlen (new_argv0) + 1); } } __argc_safe = __argc; if (user_data->premain[0]) for (unsigned int i = 0; i < PREMAIN_LEN / 2; i++) user_data->premain[i] (__argc, __argv, user_data); /* Set up standard fds in file descriptor table. */ cygheap->fdtab.stdio_init (); /* Set up __progname for getopt error call. */ if (__argv[0] && (__progname = strrchr (__argv[0], '/'))) ++__progname; else __progname = __argv[0]; program_invocation_name = __argv[0]; program_invocation_short_name = __progname; if (__progname) { char *cp = strchr (__progname, '\0') - 4; if (cp > __progname && ascii_strcasematch (cp, ".exe")) *cp = '\0'; } (void) xdr_set_vprintf (&cygxdr_vwarnx); cygwin_finished_initializing = true; /* Call init of loaded dlls. */ dlls.init (); /* Execute any specified "premain" functions */ if (user_data->premain[PREMAIN_LEN / 2]) for (unsigned int i = PREMAIN_LEN / 2; i < PREMAIN_LEN; i++) user_data->premain[i] (__argc, __argv, user_data); set_errno (0); if (dynamically_loaded) { _setlocale_r (_REENT, LC_CTYPE, "C"); return; } /* Disable case-insensitive globbing */ ignore_case_with_glob = false; MALLOC_CHECK; cygbench (__progname); ld_preload (); /* Per POSIX set the default application locale back to "C". */ _setlocale_r (_REENT, LC_CTYPE, "C"); if (!user_data->main) { /* Handle any signals which may have arrived */ _my_tls.call_signal_handler (); _my_tls.incyg--; /* Not in Cygwin anymore */ } else { /* Create a copy of Cygwin's version of __argv so that, if the user makes a change to an element of argv[] it does not affect Cygwin's argv. Changing the the contents of what argv[n] points to will still affect Cygwin. This is similar (but not exactly like) Linux. */ char *newargv[__argc + 1]; char **nav = newargv; char **oav = __argv; while ((*nav++ = *oav++) != NULL) continue; /* Handle any signals which may have arrived */ sig_dispatch_pending (false); _my_tls.call_signal_handler (); _my_tls.incyg--; /* Not in Cygwin anymore */ #ifdef __x86_64__ cygwin_exit (user_data->main (__argc, newargv, __cygwin_environ)); #else cygwin_exit (user_data->main (__argc, newargv, *user_data->envptr)); #endif } __asm__ (" \n\ .global _cygwin_exit_return \n\ .global __cygwin_exit_return \n\ _cygwin_exit_return: \n\ __cygwin_exit_return: \n\ nop \n\ "); } extern "C" void __stdcall _dll_crt0 () { #ifndef __x86_64__ /* Handle WOW64 process on XP/2K3 which has been started from native 64 bit process. See comment in wow64_test_for_64bit_parent for a full problem description. */ if (wow64_needs_stack_adjustment && !dynamically_loaded) { /* Must be static since it's referenced after the stack and frame pointer registers have been changed. */ static PVOID allocationbase = 0; /* Check if we just move the stack. If so, wow64_revert_to_original_stack returns a non-NULL, 16 byte aligned address. See comments in wow64_revert_to_original_stack for the gory details. */ PVOID stackaddr = wow64_revert_to_original_stack (allocationbase); if (stackaddr) { /* 2nd half of the stack move. Set stack pointer to new address. Set frame pointer to 0. */ __asm__ ("\n\ movl %[ADDR], %%esp \n\ xorl %%ebp, %%ebp \n" : : [ADDR] "r" (stackaddr)); /* Now we're back on the original stack. Free up space taken by the former main thread stack and set DeallocationStack correctly. */ VirtualFree (NtCurrentTeb ()->DeallocationStack, 0, MEM_RELEASE); NtCurrentTeb ()->DeallocationStack = allocationbase; } else /* Fall back to respawn if wow64_revert_to_original_stack fails. */ wow64_respawn_process (); } #endif /* !__x86_64__ */ _feinitialise (); #ifndef __x86_64__ main_environ = user_data->envptr; #endif if (in_forkee) { fork_info->alloc_stack (); _main_tls = &_my_tls; } _main_tls->call ((DWORD (*) (void *, void *)) dll_crt0_1, NULL); } void dll_crt0 (per_process *uptr) { /* Set the local copy of the pointer into the user space. */ if (!in_forkee && uptr && uptr != user_data) { memcpy (user_data, uptr, per_process_overwrite); *(user_data->impure_ptr_ptr) = _GLOBAL_REENT; } _dll_crt0 (); } /* This must be called by anyone who uses LoadLibrary to load cygwin1.dll. You must have CYGTLS_PADSIZE bytes reserved at the bottom of the stack calling this function, and that storage must not be overwritten until you unload cygwin1.dll, as it is used for _my_tls. It is best to load cygwin1.dll before spawning any additional threads in your process. See winsup/testsuite/cygload for an example of how to use cygwin1.dll from MSVC and non-cygwin MinGW applications. */ extern "C" void cygwin_dll_init () { #ifndef __x86_64__ static char **envp; #endif static int _fmode; user_data->magic_biscuit = sizeof (per_process); #ifndef __x86_64__ user_data->envptr = &envp; #endif user_data->fmode_ptr = &_fmode; _dll_crt0 (); } extern "C" void __main (void) { /* Ordering is critical here. DLL ctors have already been run as they were being loaded, so we should stack the queued call to DLL dtors now. */ atexit (dll_global_dtors); do_global_ctors (user_data->ctors, false); /* Now we have run global ctors, register their dtors. At exit, global dtors will run first, so the app can still use shared library functions while terminating; then the DLLs will be destroyed; finally newlib will shut down stdio and terminate itself. */ atexit (do_global_dtors); sig_dispatch_pending (true); } void __reg1 do_exit (int status) { syscall_printf ("do_exit (%d), exit_state %d", status, exit_state); #ifdef NEWVFORK vfork_save *vf = vfork_storage.val (); if (vf != NULL && vf->pid < 0) { exit_state = ES_NOT_EXITING; vf->restore_exit (status); } #endif lock_process until_exit (true); if (exit_state < ES_EVENTS_TERMINATE) exit_state = ES_EVENTS_TERMINATE; if (exit_state < ES_SIGNAL) { exit_state = ES_SIGNAL; signal (SIGCHLD, SIG_IGN); signal (SIGHUP, SIG_IGN); signal (SIGINT, SIG_IGN); signal (SIGQUIT, SIG_IGN); } if (exit_state < ES_CLOSEALL) { exit_state = ES_CLOSEALL; close_all_files (); } UINT n = (UINT) status; if (exit_state < ES_THREADTERM) { exit_state = ES_THREADTERM; cygthread::terminate (); } myself->stopsig = 0; if (exit_state < ES_HUP_PGRP) { exit_state = ES_HUP_PGRP; /* Kill orphaned children on group leader exit */ if (myself->has_pgid_children && myself->pid == myself->pgid) { siginfo_t si = {0}; si.si_signo = -SIGHUP; si.si_code = SI_KERNEL; sigproc_printf ("%u == pgrp %u, send SIG{HUP,CONT} to stopped children", myself->pid, myself->pgid); kill_pgrp (myself->pgid, si); } } if (exit_state < ES_HUP_SID) { exit_state = ES_HUP_SID; /* Kill the foreground process group on session leader exit */ if (getpgrp () > 0 && myself->pid == myself->sid && real_tty_attached (myself)) { tty *tp = cygwin_shared->tty[myself->ctty]; sigproc_printf ("%u == sid %u, send SIGHUP to children", myself->pid, myself->sid); /* CGF FIXME: This can't be right. */ if (tp->getsid () == myself->sid) tp->kill_pgrp (SIGHUP); } } myself.exit (n); } extern "C" int cygwin_atexit (void (*fn) (void)) { int res; dll *d = dlls.find ((void *) _my_tls.retaddr ()); res = d ? __cxa_atexit ((void (*) (void *)) fn, NULL, d) : atexit (fn); return res; } extern "C" void cygwin_exit (int n) { exit_state = ES_EXIT_STARTING; exit (n); } extern "C" void _exit (int n) { do_exit (((DWORD) n & 0xff) << 8); } extern "C" void cygwin_stackdump (); extern "C" void vapi_fatal (const char *fmt, va_list ap) { char buf[4096]; int n = __small_sprintf (buf, "%P: *** fatal error %s- ", in_forkee ? "in forked process " : ""); __small_vsprintf (buf + n, fmt, ap); va_end (ap); strace.prntf (_STRACE_SYSTEM, NULL, "%s", buf); #ifdef DEBUGGING try_to_debug (); #endif cygwin_stackdump (); myself.exit (__api_fatal_exit_val); } extern "C" void api_fatal (const char *fmt, ...) { va_list ap; va_start (ap, fmt); vapi_fatal (fmt, ap); } void multiple_cygwin_problem (const char *what, uintptr_t magic_version, uintptr_t version) { if (_cygwin_testing && (strstr (what, "proc") || strstr (what, "cygheap"))) { child_proc_info->type = _CH_WHOOPS; return; } if (GetEnvironmentVariableA ("CYGWIN_MISMATCH_OK", NULL, 0)) return; if (CYGWIN_VERSION_MAGIC_VERSION (magic_version) == version) system_printf ("%s magic number mismatch detected - %p/%ly", what, magic_version, version); else api_fatal ("%s mismatch detected - %ly/%ly.\n\ This problem is probably due to using incompatible versions of the cygwin DLL.\n\ Search for cygwin1.dll using the Windows Start->Find/Search facility\n\ and delete all but the most recent version. The most recent version *should*\n\ reside in x:\\cygwin\\bin, where 'x' is the drive on which you have\n\ installed the cygwin distribution. Rebooting is also suggested if you\n\ are unable to find another cygwin DLL.", what, magic_version, version); } #ifdef DEBUGGING void __reg1 cygbench (const char *s) { if (GetEnvironmentVariableA ("CYGWIN_BENCH", NULL, 0)) small_printf ("%05u ***** %s : %10d\n", GetCurrentProcessId (), s, strace.microseconds ()); } #endif