/* dcrt0.cc -- essentially the main() for the Cygwin dll Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 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 #include "glob.h" #include "exceptions.h" #include #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" #include "environ.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)); HANDLE NO_COPY hMainProc = (HANDLE) -1; HANDLE NO_COPY hMainThread; HANDLE NO_COPY hProcToken; HANDLE NO_COPY hProcImpToken; muto NO_COPY lock_process::locker; bool display_title; bool strip_title_path; bool allow_glob = true; bool NO_COPY in_forkee; 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; 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 = &__cygwin_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}, /* UNUSED forkee */ 0, /* hmodule */ NULL, /* api_major */ CYGWIN_VERSION_API_MAJOR, /* api_minor */ CYGWIN_VERSION_API_MINOR, /* unused2 */ {0, 0, 0, 0, 0, 0}, /* threadinterface */ &_mtinterf, /* impure_ptr */ _GLOBAL_REENT, }; bool ignore_case_with_glob; int __declspec (dllexport) _check_for_executable = true; #ifdef DEBUGGING int pinger; #endif int NO_COPY __api_fatal_exit_val = 1; }; 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 && 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; 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); } child_info NO_COPY *child_proc_info = NULL; #define CYGWIN_GUARD (PAGE_EXECUTE_READWRITE | PAGE_GUARD) void child_info_fork::alloc_stack_hard_way (volatile char *b) { void *new_stack_pointer; MEMORY_BASIC_INFORMATION m; void *newbase; int newlen; bool guard; if (!VirtualQuery ((LPCVOID) &b, &m, sizeof m)) api_fatal ("fork: couldn't get stack info, %E"); LPBYTE curbot = (LPBYTE) m.BaseAddress + m.RegionSize; if (stacktop > (LPBYTE) m.AllocationBase && stacktop < curbot) { newbase = curbot; newlen = (LPBYTE) stackbottom - (LPBYTE) curbot; guard = false; } else { newbase = (LPBYTE) stacktop - (128 * 1024); newlen = (LPBYTE) stackbottom - (LPBYTE) newbase; guard = true; } if (!VirtualAlloc (newbase, newlen, MEM_RESERVE, PAGE_NOACCESS)) api_fatal ("fork: can't reserve memory for stack %p - %p, %E", stacktop, stackbottom); new_stack_pointer = (void *) ((LPBYTE) stackbottom - (stacksize += 8192)); if (!VirtualAlloc (new_stack_pointer, stacksize, MEM_COMMIT, PAGE_EXECUTE_READWRITE)) api_fatal ("fork: can't commit memory for stack %p(%d), %E", new_stack_pointer, stacksize); if (!VirtualQuery ((LPCVOID) new_stack_pointer, &m, sizeof m)) api_fatal ("fork: couldn't get new stack info, %E"); if (guard) { m.BaseAddress = (LPBYTE) 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"); stacktop = m.BaseAddress; 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 esp; __asm__ volatile ("movl %%esp,%0": "=r" (esp)); if (_tlsbase != stackbottom) alloc_stack_hard_way (esp); else { char *st = (char *) stacktop - 4096; while (_tlstop >= st) esp = getstack (esp); stacksize = 0; } } 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]; DWORD len; if (GetEnvironmentVariableA ("CYGWIN_SLEEP", buf, sizeof (buf) - 1)) { DWORD ms = atoi (buf); console_printf ("Sleeping %d, pid %u %P\n", ms, GetCurrentProcessId ()); Sleep (ms); if (!strace.active () && !dynamically_loaded) strace.hello (); } if (GetEnvironmentVariableA ("CYGWIN_DEBUG", buf, sizeof (buf) - 1)) { char buf1[NT_MAX_PATH]; len = 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); 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) 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", (DWORD) res->cygheap, (DWORD) &_cygheap_start); unsigned should_be_cb = 0; switch (res->type) { case _PROC_FORK: in_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)); if (res->isstraced ()) { res->ready (false); for (unsigned i = 0; !being_debugged () && i < 10000; i++) low_priority_sleep (0); strace.hello (); } break; default: system_printf ("unknown exec type %d", res->type); /* intentionally fall through */ case _PROC_WHOOPS: res = NULL; break; } } return res; } #define dll_data_start &_data_start__ #define dll_data_end &_data_end__ #define dll_bss_start &_bss_start__ #define dll_bss_end &_bss_end__ void child_info_fork::handle_fork () { cygheap_fixup_in_child (false); memory_init (); set_myself (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); /* 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"); } void child_info_spawn::handle_spawn () { HANDLE h; cygheap_fixup_in_child (true); memory_init (); if (!moreinfo->myself_pinfo || !DuplicateHandle (hMainProc, moreinfo->myself_pinfo, hMainProc, &h, 0, FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE)) h = NULL; set_myself (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); ready (true); /* Need to do this after debug_fixup_after_fork_exec or DEBUGGING handling of handles might get confused. */ CloseHandle (child_proc_info->parent); child_proc_info->parent = NULL; signal_fixup_after_exec (); if (moreinfo->old_title) { old_title = strcpy (title_buf, moreinfo->old_title); cfree (moreinfo->old_title); } } void __stdcall dll_crt0_0 () { init_global_security (); initial_env (); SetErrorMode (SEM_FAILCRITICALERRORS); /* 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. */ sigproc_init (); 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; if (!DuplicateHandle (GetCurrentProcess (), GetCurrentProcess (), GetCurrentProcess (), &hMainProc, 0, FALSE, DUPLICATE_SAME_ACCESS)) hMainProc = GetCurrentProcess (); DuplicateHandle (hMainProc, GetCurrentThread (), hMainProc, &hMainThread, 0, false, DUPLICATE_SAME_ACCESS); OpenProcessToken (hMainProc, MAXIMUM_ALLOWED, &hProcToken); set_cygwin_privileges (hProcToken); 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: fork_info->handle_fork (); break; case _PROC_SPAWN: case _PROC_EXEC: spawn_info->handle_spawn (); break; } } user_data->threadinterface->Init (); _cygtls::init (); /* Initialize events */ events_init (); tty_list::init_session (); cygheap->cwd.init (); debug_printf ("finished dll_crt0_0 initialization"); } /* 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 *) { check_sanity_and_sync (user_data); malloc_init (); #ifdef CGF int i = 0; const int n = 2 * 1024 * 1024; while (i--) small_printf ("cmalloc returns %p\n", cmalloc (HEAP_STR, n)); #endif 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 (!in_forkee) pthread::init_mainthread (); #ifdef DEBUGGING strace.microseconds (); #endif create_signal_arrived (); /* FIXME: move into wait_sig? */ /* 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->stacksize) { _tlsbase = (char *) fork_info->stackbottom; _tlstop = (char *) fork_info->stacktop; _my_tls.init_exception_handler (_cygtls::handle_exceptions); } longjmp (fork_info->jmp, true); } #ifdef DEBUGGING { extern void fork_init (); fork_init (); } #endif pinfo_init (envp, envc); if (!old_title && GetConsoleTitle (title_buf, TITLESIZE)) old_title = title_buf; /* Allocate cygheap->fdtab */ dtable_init (); uinfo_init (); /* initialize user info */ wait_for_sigthread (); extern DWORD threadfunc_ix; if (!threadfunc_ix) system_printf ("internal error: couldn't determine location of thread function on stack. Expect signal problems."); /* Connect to tty. */ tty::init_session (); 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_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 && ascii_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. */ ld_preload (); if (user_data->main) cygwin_exit (user_data->main (__argc, __argv, *user_data->envptr)); } extern "C" void __stdcall _dll_crt0 () { main_environ = user_data->envptr; if (in_forkee) fork_info->alloc_stack (); else __sinit (_impure_ptr); _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 () { static char **envp; static int _fmode; user_data->magic_biscuit = sizeof (per_process); user_data->envptr = &envp; user_data->fmode_ptr = &_fmode; _dll_crt0 (); } extern "C" void __main (void) { do_global_ctors (user_data->ctors, false); atexit (do_global_dtors); } exit_states NO_COPY exit_state; 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 lock_process until_exit (true); if (exit_state < ES_GLOBAL_DTORS) { exit_state = ES_GLOBAL_DTORS; 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 (); } 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 ("%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_TITLE) { exit_state = ES_TITLE; /* restore console title */ if (old_title && display_title) set_console_title (old_title); } if (exit_state < ES_TTY_TERMINATE) { exit_state = ES_TTY_TERMINATE; cygwin_shared->tty.terminate (); } 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: *** fatal error - "); __small_vsprintf (buf + n, fmt, ap); va_end (ap); strace.prntf (_STRACE_SYSTEM, NULL, "%s", buf); #ifdef DEBUGGING try_to_debug (); #endif myself.exit (__api_fatal_exit_val); } 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; } if (GetEnvironmentVariableA ("CYGWIN_MISMATCH_OK", NULL, 0)) 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) { if (GetEnvironmentVariableA ("CYGWIN_BENCH", NULL, 0)) small_printf ("%05d ***** %s : %10d\n", GetCurrentProcessId (), s, strace.microseconds ()); } #endif