/* dcrt0.cc -- essentially the main() for the Cygwin dll Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 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 #include #include #include "glob.h" #include "exceptions.h" #include #include #include #include #include "sigproc.h" #include "pinfo.h" #include "cygerrno.h" #define NEED_VFORK #include "perprocess.h" #include "security.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 "sync.h" #include "heap.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); void ld_preload (); HANDLE NO_COPY hMainProc = (HANDLE) -1; HANDLE NO_COPY hMainThread; HANDLE NO_COPY hProcToken; HANDLE NO_COPY hProcImpToken; muto NO_COPY dtable::lock_cs; /* This should be in dtable.cc but it causes inexplicable errors there. */ bool display_title; bool strip_title_path; bool allow_glob = true; codepage_type current_codepage = ansi_cp; int __argc_safe; int _declspec(dllexport) __argc; char _declspec(dllexport) **__argv; #ifdef NEWVFORK vfork_save NO_COPY *main_vfork; #endif static int NO_COPY envc; char NO_COPY **envp; extern "C" void __sinit (_reent *); _cygtls NO_COPY *_main_tls; bool NO_COPY cygwin_finished_initializing; /* Used in SIGTOMASK for generating a bit for insertion into a sigset_t. This is subtracted from the signal number prior to shifting the bit. In older versions of cygwin, the signal was used as-is to shift the bit for masking. So, we'll temporarily detect this and set it to zero for programs that are linked using older cygwins. This is just a stopgap measure to allow an orderly transfer to the new, correct sigmask method. */ unsigned NO_COPY int signal_shift_subtract = 1; ResourceLocks _reslock NO_COPY; MTinterface _mtinterf; bool NO_COPY _cygwin_testing; char NO_COPY almost_null[1]; extern "C" { /* This is an exported copy of environ which can be used by DLLs which use cygwin.dll. */ char **__cygwin_environ; char ***main_environ; /* __progname used in getopt error message */ char *__progname; struct per_process __cygwin_user_data = {/* initial_sp */ 0, /* magic_biscuit */ 0, /* dll_major */ CYGWIN_VERSION_DLL_MAJOR, /* dll_major */ CYGWIN_VERSION_DLL_MINOR, /* impure_ptr_ptr */ NULL, /* envptr */ NULL, /* malloc */ malloc, /* free */ free, /* realloc */ realloc, /* fmode_ptr */ NULL, /* main */ NULL, /* ctors */ NULL, /* dtors */ NULL, /* data_start */ NULL, /* data_end */ NULL, /* bss_start */ NULL, /* bss_end */ NULL, /* calloc */ calloc, /* premain */ {NULL, NULL, NULL, NULL}, /* run_ctors_p */ 0, /* unused */ {0, 0, 0, 0, 0, 0, 0}, /* forkee */ 0, /* hmodule */ NULL, /* api_major */ CYGWIN_VERSION_API_MAJOR, /* api_minor */ CYGWIN_VERSION_API_MINOR, /* unused2 */ {0, 0, 0, 0, 0}, /* resourcelocks */ &_reslock, /* threadinterface */ &_mtinterf, /* impure_ptr */ _GLOBAL_REENT, }; bool ignore_case_with_glob; int __declspec (dllexport) _check_for_executable = true; #ifdef DEBUGGING int pinger; #endif }; char *old_title; char title_buf[TITLESIZE + 1]; 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 && user_data->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; f = CreateFile (name + 1, GENERIC_READ, /* open for reading */ FILE_SHARE_READ, /* share for reading */ &sec_none_nih, /* no 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 = strechr (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. */ 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 = isdrive (word); if (!dos_spec && isquote (*word) && word[1] && word[2]) dos_spec = isdrive (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++ = '\\'; *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; cmd = quoted (cmd, winshell && argc > 0); } 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; } } 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 %d < %d", 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 %d != %d", 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 %d > %d", p->api_major, cygwin_version.api_major); if (CYGWIN_VERSION_DLL_MAKE_COMBINED (p->dll_major, p->dll_minor) <= CYGWIN_VERSION_DLL_BAD_SIGNAL_MASK) signal_shift_subtract = 0; } child_info NO_COPY *child_proc_info = NULL; static MEMORY_BASIC_INFORMATION NO_COPY sm; #define CYGWIN_GUARD ((wincap.has_page_guard ()) ? \ PAGE_EXECUTE_READWRITE|PAGE_GUARD : PAGE_NOACCESS) static void alloc_stack_hard_way (child_info_fork *ci, volatile char *b) { void *new_stack_pointer; MEMORY_BASIC_INFORMATION m; void *newbase; int newlen; LPBYTE curbot = (LPBYTE) sm.BaseAddress + sm.RegionSize; bool noguard; if (ci->stacktop > (LPBYTE) sm.AllocationBase && ci->stacktop < curbot) { newbase = curbot; newlen = (LPBYTE) ci->stackbottom - (LPBYTE) curbot; noguard = 1; } else { newbase = ci->stacktop; newlen = (DWORD) ci->stackbottom - (DWORD) ci->stacktop; noguard = 0; } if (!VirtualAlloc (newbase, newlen, MEM_RESERVE, PAGE_NOACCESS)) api_fatal ("fork: can't reserve memory for stack %p - %p, %E", ci->stacktop, ci->stackbottom); new_stack_pointer = (void *) ((LPBYTE) ci->stackbottom - ci->stacksize); if (!VirtualAlloc (new_stack_pointer, ci->stacksize, MEM_COMMIT, PAGE_EXECUTE_READWRITE)) api_fatal ("fork: can't commit memory for stack %p(%d), %E", new_stack_pointer, ci->stacksize); if (!VirtualQuery ((LPCVOID) new_stack_pointer, &m, sizeof m)) api_fatal ("fork: couldn't get new stack info, %E"); if (!noguard) { m.BaseAddress = (LPVOID) ((DWORD) m.BaseAddress - 1); if (!VirtualAlloc ((LPVOID) m.BaseAddress, 1, MEM_COMMIT, CYGWIN_GUARD)) api_fatal ("fork: couldn't allocate new stack guard page %p, %E", m.BaseAddress); } if (!VirtualQuery ((LPCVOID) m.BaseAddress, &m, sizeof m)) api_fatal ("fork: couldn't get new stack info, %E"); ci->stacktop = m.BaseAddress; b[0] = '\0'; } /* extend the stack prior to fork longjmp */ static void alloc_stack (child_info_fork *ci) { /* FIXME: adding 16384 seems to avoid a stack copy problem during fork on Win95, but I don't know exactly why yet. DJ */ volatile char b[ci->stacksize + 16384]; if (!VirtualQuery ((LPCVOID) &b, &sm, sizeof sm)) api_fatal ("fork: couldn't get stack info, %E"); if (sm.AllocationBase == ci->stacktop) ci->stacksize = 0; else alloc_stack_hard_way (ci, b + sizeof (b) - 1); return; } #ifdef DEBUGGING void break_here () { debug_printf ("break here"); } #endif static void initial_env () { char buf[CYG_MAX_PATH]; if (GetEnvironmentVariable ("CYGWIN_TESTING", buf, sizeof (buf) - 1)) _cygwin_testing = 1; #ifdef DEBUGGING DWORD len; if (GetEnvironmentVariable ("CYGWIN_SLEEP", buf, sizeof (buf) - 1)) { DWORD ms = atoi (buf); buf[0] = '\0'; len = GetModuleFileName (NULL, buf, CYG_MAX_PATH); console_printf ("Sleeping %d, pid %u %s\n", ms, GetCurrentProcessId (), buf); Sleep (ms); if (!strace.active) { strace.inited = 0; strace.hello (); } } if (GetEnvironmentVariable ("CYGWIN_DEBUG", buf, sizeof (buf) - 1)) { char buf1[CYG_MAX_PATH]; len = GetModuleFileName (NULL, buf1, CYG_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); try_to_debug (); console_printf ("*** Sending Break. gdb may issue spurious SIGTRAP message.\n"); DebugBreak (); break_here (); } } #endif } child_info * get_cygwin_startup_info () { STARTUPINFO si; char zeros[sizeof (child_proc_info->zero)] = {0}; GetStartupInfo (&si); child_info *res = (child_info *) si.lpReserved2; if (si.cbReserved2 < EXEC_MAGIC_SIZE || !res || memcmp (res->zero, zeros, sizeof (res->zero)) != 0) res = NULL; else { if ((res->intro & OPROC_MAGIC_MASK) == OPROC_MAGIC_GENERIC) multiple_cygwin_problem ("proc intro", res->intro, 0); else if (res->intro == PROC_MAGIC_GENERIC && res->magic != CHILD_INFO_MAGIC) multiple_cygwin_problem ("proc magic", res->magic, CHILD_INFO_MAGIC); else if (res->cygheap != (void *) &_cygheap_start) multiple_cygwin_problem ("cygheap base", (DWORD) res->cygheap, (DWORD) &_cygheap_start); unsigned should_be_cb = 0; switch (res->type) { case _PROC_FORK: user_data->forkee = true; should_be_cb = sizeof (child_info_fork); /* fall through */; case _PROC_SPAWN: case _PROC_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)); break; default: system_printf ("unknown exec type %d", res->type); /* intentionally fall through */ case _PROC_WHOOPS: res = NULL; break; } } return res; } void __stdcall dll_crt0_0 () { wincap.init (); initial_env (); init_console_handler (); init_global_security (); if (!DuplicateHandle (GetCurrentProcess (), GetCurrentProcess (), GetCurrentProcess (), &hMainProc, 0, FALSE, DUPLICATE_SAME_ACCESS)) hMainProc = GetCurrentProcess (); DuplicateHandle (hMainProc, GetCurrentThread (), hMainProc, &hMainThread, 0, false, DUPLICATE_SAME_ACCESS); if (wincap.has_security ()) OpenProcessToken (hMainProc, MAXIMUM_ALLOWED, &hProcToken); (void) SetErrorMode (SEM_FAILCRITICALERRORS); device::init (); do_global_ctors (&__CTOR_LIST__, 1); cygthread::init (); child_proc_info = get_cygwin_startup_info (); if (!child_proc_info) memory_init (); else { cygwin_user_h = child_proc_info->user_h; switch (child_proc_info->type) { case _PROC_FORK: alloc_stack (fork_info); cygheap_fixup_in_child (false); memory_init (); set_myself (NULL); break; case _PROC_SPAWN: case _PROC_EXEC: HANDLE h; cygheap_fixup_in_child (true); memory_init (); if (!spawn_info->moreinfo->myself_pinfo || !DuplicateHandle (hMainProc, spawn_info->moreinfo->myself_pinfo, hMainProc, &h, 0, FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE)) h = NULL; set_myself (h); if (child_proc_info->type != _PROC_FORK) child_proc_info->ready (true); __argc = spawn_info->moreinfo->argc; __argv = spawn_info->moreinfo->argv; envp = spawn_info->moreinfo->envp; envc = spawn_info->moreinfo->envc; if (!dynamically_loaded) cygheap->fdtab.fixup_after_exec (); signal_fixup_after_exec (); if (spawn_info->moreinfo->old_title) { old_title = strcpy (title_buf, spawn_info->moreinfo->old_title); cfree (spawn_info->moreinfo->old_title); } break; } } _cygtls::init (); /* Initialize events */ events_init (); cygheap->cwd.init (); /* Late duplicate simplifies tweaking the process token in uinfo.cc. */ if (wincap.has_security ()) DuplicateTokenEx (hProcToken, MAXIMUM_ALLOWED, NULL, SecurityImpersonation, TokenImpersonation, &hProcImpToken); } /* 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. */ static void dll_crt0_1 (char *) { /* According to onno@stack.urc.tue.nl, the exception handler record must be on the stack. */ /* FIXME: Verify forked children get their exception handler set up ok. */ exception_list cygwin_except_entry; check_sanity_and_sync (user_data); malloc_init (); /* Initialize SIGSEGV handling, etc. */ init_exceptions (&cygwin_except_entry); user_data->resourcelocks->Init (); user_data->threadinterface->Init (); ProtectHandle (hMainProc); ProtectHandle (hMainThread); /* Initialize pthread mainthread when not forked and it is safe to call new, otherwise it is reinitalized in fixup_after_fork */ if (!user_data->forkee) pthread::init_mainthread (); #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 (user_data->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->stacksize) { _tlsbase = (char *) fork_info->stackbottom; _tlstop = (char *) fork_info->stacktop; } longjmp (fork_info->jmp, true); } #ifdef DEBUGGING { extern void fork_init (); fork_init (); } #endif /* Initialize our process table entry. */ pinfo_init (envp, envc); /* Can be set only after environment has been initialized. */ if (wincap.has_security ()) set_cygwin_privileges (hProcImpToken); if (!old_title && GetConsoleTitle (title_buf, TITLESIZE)) old_title = title_buf; /* Allocate cygheap->fdtab */ dtable_init (); /* Initialize user info. */ uinfo_init (); /* Initialize signal/subprocess handling. */ sigproc_init (); /* Connect to tty. */ tty_init (); if (!__argc) { char *line = GetCommandLineA (); line = strcpy ((char *) alloca (strlen (line) + 1), line); if (current_codepage == oem_cp) CharToOemA (line, line); /* 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 (CYG_MAX_PATH); cygwin_conv_to_posix_path (__argv[0], new_argv0); __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]; if (__progname) { char *cp = strchr (__progname, '\0') - 4; if (cp > __progname && strcasematch (cp, ".exe")) *cp = '\0'; } /* Set new console title if appropriate. */ if (display_title && !dynamically_loaded) { char *cp = __progname; if (strip_title_path) for (char *ptr = cp; *ptr && *ptr != ' '; ptr++) if (isdirsep (*ptr)) cp = ptr + 1; set_console_title (cp); } 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); debug_printf ("user_data->main %p", user_data->main); if (dynamically_loaded) { set_errno (0); return; } /* Disable case-insensitive globbing */ ignore_case_with_glob = false; set_errno (0); MALLOC_CHECK; cygbench (__progname); /* Flush signals and ensure that signal thread is up and running. Can't do this for noncygwin case since the signal thread is blocked due to LoadLibrary serialization. */ wait_for_sigthread (); ld_preload (); if (user_data->main) cygwin_exit (user_data->main (__argc, __argv, *user_data->envptr)); } struct _reent * initialize_main_tls (char *padding) { if (!_main_tls) { _main_tls = &_my_tls; _main_tls->init_thread (padding, NULL); } return &_main_tls->local_clib; } /* Wrap the real one, otherwise gdb gets confused about two symbols with the same name, but different addresses. UPTR is a pointer to global data that lives on the libc side of the line [if one distinguishes the application from the dll]. */ extern "C" void __stdcall _dll_crt0 () { extern HANDLE sync_startup; extern unsigned threadfunc_ix; if (threadfunc_ix) /* nothing to do */; else if (!sync_startup) system_printf ("internal error: sync_startup not called at start. Expect signal problems."); else { (void) WaitForSingleObject (sync_startup, INFINITE); CloseHandle (sync_startup); } if (!threadfunc_ix) system_printf ("internal error: couldn't determine location of thread function on stack. Expect signal problems."); main_environ = user_data->envptr; *main_environ = NULL; char padding[CYGTLS_PADSIZE]; _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"; if (child_proc_info && child_proc_info->type == _PROC_FORK) user_data->forkee = true; else __sinit (_impure_ptr); initialize_main_tls (padding); dll_crt0_1 (padding); } void dll_crt0 (per_process *uptr) { /* Set the local copy of the pointer into the user space. */ if (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 () { static char **envp; static int _fmode; if (!DuplicateHandle (GetCurrentProcess (), GetCurrentProcess (), GetCurrentProcess (), &hMainProc, 0, FALSE, DUPLICATE_SAME_ACCESS)) hMainProc = GetCurrentProcess (); DuplicateHandle (hMainProc, GetCurrentThread (), hMainProc, &hMainThread, 0, FALSE, DUPLICATE_SAME_ACCESS); user_data->magic_biscuit = sizeof (per_process); user_data->envptr = &envp; user_data->fmode_ptr = &_fmode; main_environ = user_data->envptr; *main_environ = NULL; initialize_main_tls((char *)&_my_tls); dll_crt0_1 (NULL); } extern "C" void __main (void) { do_global_ctors (user_data->ctors, false); atexit (do_global_dtors); } exit_states NO_COPY exit_state; extern CRITICAL_SECTION exit_lock; void __stdcall 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 EnterCriticalSection (&exit_lock); muto::set_exiting_thread (); dll_global_dtors (); if (exit_state < ES_EVENTS_TERMINATE) { exit_state = ES_EVENTS_TERMINATE; events_terminate (); } UINT n = (UINT) status; if (exit_state < ES_THREADTERM) { exit_state = ES_THREADTERM; cygthread::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 (); } if (exit_state < ES_SIGPROCTERMINATE) { exit_state = ES_SIGPROCTERMINATE; sigproc_terminate (); } myself->stopsig = 0; if (exit_state < ES_TITLE) { exit_state = ES_TITLE; /* restore console title */ if (old_title && display_title) set_console_title (old_title); } 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; si.si_signo = -SIGHUP; si.si_code = SI_KERNEL; si.si_pid = si.si_uid = si.si_errno = 0; sigproc_printf ("%d == pgrp %d, 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 ("%d == sid %d, send SIGHUP to children", myself->pid, myself->sid); /* CGF FIXME: This can't be right. */ if (tp->getsid () == myself->sid) tp->kill_pgrp (SIGHUP); } } if (exit_state < ES_TTY_TERMINATE) { exit_state = ES_TTY_TERMINATE; tty_terminate (); } minimal_printf ("winpid %d, exit %d", GetCurrentProcessId (), n); myself.exit (n); } static NO_COPY muto atexit_lock; extern "C" int cygwin_atexit (void (*function)(void)) { int res; atexit_lock.init ("atexit_lock"); atexit_lock.acquire (); res = atexit (function); atexit_lock.release (); return res; } extern "C" void cygwin_exit (int n) { dll_global_dtors (); if (atexit_lock) atexit_lock.acquire (); exit (n); } extern "C" void _exit (int n) { do_exit (((DWORD) n & 0xff) << 8); } extern "C" void __api_fatal (const char *fmt, ...) { char buf[4096]; va_list ap; va_start (ap, fmt); int n = __small_sprintf (buf, "%P (%u): *** ", cygwin_pid (GetCurrentProcessId ())); __small_vsprintf (buf + n, fmt, ap); va_end (ap); strcat (buf, "\n"); int len = strlen (buf); DWORD done; (void) WriteFile (GetStdHandle (STD_ERROR_HANDLE), buf, len, &done, 0); /* Make sure that the message shows up on the screen, too, since this is a serious error. */ if (GetFileType (GetStdHandle (STD_ERROR_HANDLE)) != FILE_TYPE_CHAR) { HANDLE h = CreateFile ("CONOUT$", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_WRITE | FILE_SHARE_WRITE, &sec_none, OPEN_EXISTING, 0, 0); if (h != INVALID_HANDLE_VALUE) (void) WriteFile (h, buf, len, &done, 0); } /* We are going down without mercy. Make sure we reset our process_state. */ sigproc_terminate (); #ifdef DEBUGGING (void) try_to_debug (); #endif myself.exit (1); } void multiple_cygwin_problem (const char *what, unsigned magic_version, unsigned version) { if (_cygwin_testing && (strstr (what, "proc") || strstr (what, "cygheap"))) { child_proc_info->type = _PROC_WHOOPS; return; } char buf[1024]; if (GetEnvironmentVariable ("CYGWIN_MISMATCH_OK", buf, sizeof (buf))) return; if (CYGWIN_VERSION_MAGIC_VERSION (magic_version) == version) system_printf ("%s magic number mismatch detected - %p/%p", what, magic_version, version); else api_fatal ("%s mismatch detected - %p/%p.\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 __stdcall cygbench (const char *s) { char buf[1024]; if (GetEnvironmentVariable ("CYGWIN_BENCH", buf, sizeof (buf))) small_printf ("%05d ***** %s : %10d\n", GetCurrentProcessId (), s, strace.microseconds ()); } #endif