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winapi.c
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winapi.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#ifdef _MSC_VER
#define random rand
#define strtok_r strtok_s
#endif
#ifndef _MSC_VER
#include <unistd.h>
#endif
#include <fcntl.h>
#include <errno.h>
#include <assert.h>
#ifndef _MSC_VER
#include <sys/wait.h>
#include <sys/signal.h>
#else
#include "asprintf.h"
#endif
#include <sys/stat.h>
#ifndef _MSC_VER
#define s_stat stat
#define p_stat stat
#else
#define s_stat _stat64i32
#define p_stat _stat
#endif
#include "winapi.h"
#ifdef __CYGWIN__
#include <sys/cygwin.h>
#endif
/** globals */
pf_NtRtlCloneUserProcess CloneUserProcess;
pf_NtRtlCreateProcessReflection CreateProcessReflection;
pf_NtQueryInformationProcess QueryInformationProcess;
pf_NtUnicodeStringToAnsiString UnicodeStringToAnsiString;
pf_RtlFreeAnsiString FreeAnsiString;
pf_NtQuerySystemInformation QuerySystemInformation;
pf_NtQueryObject QueryObject;
pf_LdrpInitializeProcess LdrpInitializeProcess;
//const size_t o_LdrpInitializeProcess = 0x474f9;
//const size_t o_LdrpInitialize = 0x39336;
#define o_LdrpInitializeProcess 0x474f9
#define o_LdrpInitialize 0x39336
struct import_t { PCHAR name; size_t offset; void* target; };
static LPVOID ntdll_base = NULL;
static struct import_t Ntdll_Imports[] =
{
{"RtlCloneUserProcess", 0, &CloneUserProcess},
{"RtlCreateProcessReflection", 0, &CreateProcessReflection},
{"ZwQueryInformationProcess", 0, &QueryInformationProcess},
{"RtlUnicodeStringToAnsiString", 0, &UnicodeStringToAnsiString},
{"RtlFreeAnsiString", 0, &FreeAnsiString},
{"NtQuerySystemInformation", 0, &QuerySystemInformation},
{"NtQueryObject", 0, &QueryObject},
{NULL, o_LdrpInitializeProcess, &LdrpInitializeProcess},
{NULL, o_LdrpInitialize, NULL},
{NULL, 0, NULL}
};
/** constructor */
#ifdef __GNUC__
__attribute__((noreturn))
#elif defined(_MSC_VER)
__declspec(noreturn)
#endif
static void
fatal(const char* fmt, ...)
{
va_list va;
va_start(va, fmt);
vfprintf(stderr, fmt, va);
fprintf(stderr, "\n");
va_end(va);
exit(errno);
DebugBreak();
}
// static void native_init(void)
#ifdef __GNUC__
__attribute__((constructor))
void native_init(void)
#elif defined(_MSC_VER)
void native_init(void);
#ifdef _WIN64
#define cons_prefix ""
#else
#define cons_prefix "_"
#endif
#pragma section(".CRT$XCU",read)
__declspec(allocate(".CRT$XCU")) void(*__native_init)(void) = native_init;
__pragma(comment(linker,"/include:" cons_prefix "__native_init"))
void
native_init(void)
#endif
{
struct import_t* imp;
FARPROC fp;
if (ntdll_base != NULL)
return;
ntdll_base = LoadLibrary("ntdll.dll");
if (ntdll_base == NULL)
fatal("LoadLibrary(\"ntdll.dll\") = %x", ntdll_base);
for (imp = &Ntdll_Imports[0]; imp->target != NULL; imp++) {
fp = imp->name?
GetProcAddress(ntdll_base, imp->name) :
(FARPROC)((char *)ntdll_base+imp->offset)
;
if (fp == NULL)
fatal("GetProcAddress(\"ntdll.dll\", \"%s\") failed!", imp->name);
memcpy(imp->target, &fp, sizeof(fp));
}
}
#ifdef _MSC_VER
int
asprintf(char** strp, const char* fmt, ...)
{
int res; char** p;
va_list va;
assert(strp != NULL);
assert(fmt != NULL);
va_start(va, fmt);
// wtf? why doesn't vsprintf on msvc using NULL as the target buffer return
// the size?
res = _vscprintf(fmt, va);
if (res == -1)
goto failure;
p = malloc(res+1);
if (p == NULL) {
errno = ENOMEM;
return -1;
}
p[res] = '\x00';
res = vsnprintf(p, res, fmt, va);
if (res == -1)
free(p);
*strp = (res == -1)? *strp : p;
failure:
va_end(va);
return res;
}
#endif
static
int
_isExecutable(const char* path)
{
struct s_stat st;
return ((p_stat(path, &st) == 0) && (st.st_mode & _S_IEXEC));
}
int
whereExt(const char* path, char** result)
{
static const char* PathExt_variable = "PATHEXT";
static const char* PathExt_delimiter = ";";
int res;
char* pathext, *ext;
char* fullpath;
char* wherextst;
assert(result != NULL);
*result = NULL;
if (_isExecutable(path)) {
*result = strdup(path);
return 1;
}
pathext = strdup(getenv(PathExt_variable)? getenv(PathExt_variable) : "");
if (pathext == NULL)
return -ENOMEM;
res = 0;
ext = strtok_r(pathext, PathExt_delimiter, &wherextst);
while (ext != NULL) {
fullpath = malloc(strlen(path) + strlen(ext) + sizeof(""));
if (fullpath == NULL) {
res = -ENOMEM;
goto leaving;
}
strcpy(fullpath, path);
strcat(fullpath, ext);
if (_isExecutable(fullpath)) {
*result = fullpath;
res = 1;
goto leaving;
}
free(fullpath);
ext = strtok_r(NULL, PathExt_delimiter, &wherextst);
}
res = 0;
leaving:
free(pathext);
return res;
}
int
where(const char* cmd, char** result)
{
// build-platform specific environment variables
static const char* Path_variable = "PATH";
static const char* Path_delimiter =
#ifdef _MSC_VER
";"
#else
":"
#endif
;
// regular variable definitions
char* path;
char* p; char* s, *sext;
char* wherest;
assert(result != NULL);
*result = NULL;
if (_isExecutable(cmd)) {
*result = strdup(cmd);
return 1;
}
path = strdup(getenv(Path_variable)? getenv(Path_variable) : "");
if (path == NULL)
return -ENOMEM;
p = strtok_r(path, Path_delimiter, &wherest);
while (p != NULL) {
s = malloc(strlen(p) + strlen(cmd) + sizeof(Path_delimiter));
if (s == NULL) {
free(path);
return -ENOMEM;
}
strcpy(s, p);
strcat(s, "/");
if (whereExt(strcat(s,cmd), &sext) == 1) {
free(s); s = sext; break;
}
free(sext);
free(s); s = NULL;
p = strtok_r(NULL, Path_delimiter, &wherest);
}
*result = p? s : NULL;
free(path);
return (s == NULL)? 0 : 1;
}
void
yield()
{
int prio = GetThreadPriority(GetCurrentThread());
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_IDLE);
Sleep(0);
SetThreadPriority(GetCurrentThread(), prio);
}
void
block()
{
(void)WaitForSingleObject(GetCurrentProcess(), INFINITE);
}
LPVOID
_get_PebBaseAddress(HANDLE hProcess)
{
PROCESS_BASIC_INFORMATION pbi; ULONG sz;
if (QueryInformationProcess(hProcess, ProcessBasicInformation, &pbi, sizeof(pbi), &sz) != ERROR_SUCCESS)
return NULL;
if (sz != sizeof(pbi))
return NULL;
return pbi.PebBaseAddress;
}
static
int
_from_descriptor(void* fd, HANDLE* result)
{
intptr_t res = (intptr_t)fd;
static const DWORD StdHandleTable[] = { STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, STD_ERROR_HANDLE };
if (res < 0 || !(res < 3)) {
errno = EINVAL;
return -1;
}
assert(res < sizeof(StdHandleTable)/sizeof(StdHandleTable[0]) );
*result = GetStdHandle(StdHandleTable[res]);
return *result == INVALID_HANDLE_VALUE? -1 : 0;
}
static
int
_to_descriptor(HANDLE source, void* fd)
{
intptr_t res = (intptr_t)fd;
static const DWORD StdHandleTable[] = { STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, STD_ERROR_HANDLE };
if (res < 0 || !(res < 3)) {
errno = EINVAL;
return -1;
}
// FIXME: int cygwin_attach_handle_to_fd(char* name, int fd, HANDLE handle, mode_t bin, DWORD myaccess)
assert(res < sizeof(StdHandleTable)/sizeof(StdHandleTable[0]) );
return SetStdHandle(StdHandleTable[res], source)? 0 : -1;
}
static int
_copy_memorypages(HANDLE hChild, LPVOID ptr)
{
PVOID p; SIZE_T size;
MEMORY_BASIC_INFORMATION mbi; DWORD oProtect;
memset(&mbi, 0, sizeof(mbi));
if (VirtualQuery(ptr, &mbi, sizeof(mbi)) != sizeof(mbi))
return -1;
assert(ptr == mbi.BaseAddress);
// allocate
p = VirtualAllocEx(hChild, mbi.BaseAddress, mbi.RegionSize, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
if (p == NULL)
return -1;
if (p != mbi.BaseAddress)
goto fail;
// copy it
if (!WriteProcessMemory(hChild, mbi.BaseAddress, mbi.BaseAddress, mbi.RegionSize, &size))
goto fail;
if (size != mbi.RegionSize)
goto fail;
// restore perms
if (!VirtualProtectEx(hChild, mbi.BaseAddress, mbi.RegionSize, mbi.Protect, &oProtect))
goto fail;
return 0;
fail:
if (!VirtualFreeEx(hChild, mbi.BaseAddress, 0, MEM_RELEASE))
return -2;
return -1;
}
/** fork internals */
struct _fork_shared {
HANDLE hStdin, hStdout, hStderr;
};
static const size_t _fork_shared_size = sizeof(struct _fork_shared);
static int
_fork_prepare_child(HANDLE hChild, HANDLE hData)
{
// this can have side-effects upon failure
int res;
struct _fork_shared* shared;
HANDLE hCurrentProcess = GetCurrentProcess();
HANDLE handle;
struct _PEB* peb = _get_PebBaseAddress(hCurrentProcess);
#if 0
struct _PEB cPeb; SIZE_T cPeb_size;
// platform state
if (ReadProcessMemory(hChild, _get_PebBaseAddress(hChild),
&cPeb, sizeof(cPeb), &cPeb_size) == FALSE)
return -1;
assert(cPeb_size == sizeof(cPeb));
#endif
/*
+0x04c ReadOnlySharedMemoryBase : Ptr32 Void
...
+0x054 ReadOnlyStaticServerData : Ptr32 Ptr32 Void
*/
res = _copy_memorypages(hChild, *(PVOID*)((char*)(peb)+0x4c));
assert(res == 0);
// user-defined data
shared = MapViewOfFile(hData, FILE_MAP_ALL_ACCESS, 0, 0, 0);
if (shared == NULL)
return -1;
handle = GetStdHandle(STD_INPUT_HANDLE);
assert( handle != INVALID_HANDLE_VALUE );
assert( DuplicateHandle(hCurrentProcess, handle, hChild, &shared->hStdin, 0, TRUE, DUPLICATE_SAME_ACCESS) != 0);
handle = GetStdHandle(STD_OUTPUT_HANDLE);
assert( handle != INVALID_HANDLE_VALUE );
assert( DuplicateHandle(hCurrentProcess, handle, hChild, &shared->hStdout, 0, TRUE, DUPLICATE_SAME_ACCESS) != 0 );
handle = GetStdHandle(STD_ERROR_HANDLE);
assert( handle != INVALID_HANDLE_VALUE );
assert( DuplicateHandle(hCurrentProcess, handle, hChild, &shared->hStderr, 0, TRUE, DUPLICATE_SAME_ACCESS) != 0 );
if (UnmapViewOfFile(shared) == FALSE)
return -1;
return 0;
}
static int
_fork_child_entry(HANDLE hData)
{
struct _fork_shared* shared;
shared = MapViewOfFile(hData, FILE_MAP_READ, 0, 0, 0);
if (shared == NULL)
return -1;
// snag handles that parent has duped for us
assert( _to_descriptor(shared->hStdin, (void*)STDIN_FILENO) >= 0);
assert( _to_descriptor(shared->hStdout, (void*)STDOUT_FILENO) >= 0);
assert( _to_descriptor(shared->hStderr, (void*)STDERR_FILENO) >= 0);
#if defined(__CYGWIN__)
// re-initialize cygwin
dll_dllcrt0();
#endif
#if defined(__CYGWIN__) && defined(_NATIVE_)
_fork_override_cygwin_exceptions();
#endif
if (UnmapViewOfFile(shared) == FALSE)
return -1;
return 0;
}
#if defined(__CYGWIN__) && defined(_NATIVE_)
LONG CALLBACK
_fork_cygwin_exception_handler(PEXCEPTION_POINTERS ExceptionInfo)
{
DWORD errorCode;
errorCode = ExceptionInfo->ExceptionRecord->ExceptionCode;
ExitProcess(errorCode);
// return EXCEPTION_CONTINUE_EXECUTION;
}
LONG CALLBACK
_fork_cygwin_continue_handler(PEXCEPTION_POINTERS ExceptionInfo)
{
DWORD errorCode;
errorCode = ExceptionInfo->ExceptionRecord->ExceptionCode;
return EXCEPTION_CONTINUE_SEARCH;
}
int
_fork_override_cygwin_exceptions()
{
HANDLE hr;
hr = AddVectoredExceptionHandler(1, &_fork_cygwin_exception_handler);
assert(hr != NULL);
hr = AddVectoredContinueHandler(1, &_fork_cygwin_continue_handler);
assert(hr != NULL);
}
#else // defined(__CYGWIN__) && defined(_NATIVE_)
int
_fork_override_cygwin_exceptions()
{
return 0;
}
#endif // defined(__CYGWIN__) && defined(_NATIVE_)
#ifdef _NATIVE_
_pid_t
native_fork(void)
{
RTL_USER_PROCESS_INFORMATION pri;
NTSTATUS hr; int res;
HANDLE hFile, ev; SECURITY_ATTRIBUTES attr;
memset(&attr, 0, sizeof attr);
// create event and shared page
attr.nLength = sizeof(attr);
attr.lpSecurityDescriptor = NULL;
attr.bInheritHandle = TRUE;
if ((ev = CreateEvent(&attr, FALSE, FALSE, NULL)) == NULL)
goto fail;
hFile = CreateFileMapping(INVALID_HANDLE_VALUE, &attr,
PAGE_EXECUTE_READWRITE,
(_fork_shared_size >> 32) & 0xffffffff, (_fork_shared_size & 0xffffffff),
NULL);
if (hFile == NULL)
goto fail_event;
// clone process
hr = CloneUserProcess(
RTL_CLONE_PROCESS_FLAGS_CREATE_SUSPENDED | RTL_CLONE_PROCESS_FLAGS_INHERIT_HANDLES,
NULL, NULL, NULL, &pri
);
if (!((hr == RTL_CLONE_PARENT) || (hr == RTL_CLONE_CHILD)))
goto fail_shmem;
// child
if (hr == RTL_CLONE_CHILD) {
if (WaitForSingleObject(ev, INFINITE) != WAIT_OBJECT_0)
goto fail_process;
CloseHandle(ev);
CloseHandle(pri.ProcessHandle); CloseHandle(pri.ThreadHandle);
// This is the only clean way I've found to re-allocate the handles
// that ntdll keeps open to some registry keys and other things..
hr = LdrpInitializeProcess(NULL, ntdll_base);
_fork_child_entry(hFile);
CloseHandle(hFile);
return 0;
}
// parent
assert(hr == RTL_CLONE_PARENT);
ResumeThread(pri.ThreadHandle); CloseHandle(pri.ThreadHandle);
res = _fork_prepare_child(pri.ProcessHandle, hFile);
if ((res < 0) || (SetEvent(ev) == FALSE))
TerminateProcess(pri.ProcessHandle, -1);
CloseHandle(ev); CloseHandle(hFile);
if (res < 0) {
CloseHandle(pri.ProcessHandle);
return (_pid_t) -1;
}
return (_pid_t) pri.ProcessHandle;
fail_process:
CloseHandle(pri.ThreadHandle);
CloseHandle(pri.ProcessHandle);
fail_shmem: CloseHandle(hFile);
fail_event: CloseHandle(ev);
fail:
// FIXME: set errno to some kind of error so that this actually will work
return (_pid_t) -1;
}
#else
void _shm_restore(DWORD pid);
_pid_t
native_fork(void)
{
int res;
DWORD pid = GetCurrentProcessId();
res = fork();
if (res == 0) {
_shm_restore(pid);
}
return (_pid_t)res;
}
#endif
_pid_t
native_waitpid(_pid_t wpid, int* status, int options)
{
DWORD res; HANDLE _wpid = (HANDLE) wpid;
assert(wpid > 0);
if (!(options & WUNTRACED)) {
errno = EINVAL;
return (_pid_t)-1;
}
res = STILL_ACTIVE;
while (res == STILL_ACTIVE) {
// wait for a signal
res = WaitForSingleObject(_wpid, INFINITE);
if (res == WAIT_FAILED)
return (_pid_t)-1;
assert(res == WAIT_OBJECT_0);
// check signal reason
if (GetExitCodeProcess(_wpid, &res) == 0)
return (_pid_t)-1;
if (res == STILL_ACTIVE)
continue;
/// store termination reason (FIXME: is this correct?)
int winfo, wcode;
// exception (use the high-byte as an error code)
if ((res & 0xc0000000) == 0xc0000000) {
wcode = (res >> 30) & 3; winfo = res & 0x3fffffff;
// some other error
} else if ((res & 0x80000000) == 0x80000000) {
wcode = (res >> 30) & 3; winfo = res & 0x3fffffff;
// terminated ok
} else {
wcode = 0; winfo = res & 0x3fffffff;
}
#if defined(__CYGWIN__)
// from cygwin/wait.h
/* A status is 16 bits, and looks like:
<1 byte info> <1 byte code>
<code> == 0, child has exited, info is the exit value
<code> == 1..7e, child has exited, info is the signal number.
<code> == 7f, child has stopped, info was the signal number.
<code> == 80, there was a core dump.
*/
*status = (wcode&0xff) | ((winfo&0xff)<<8);
#elif defined(__MINGW32__)
// from sys/wait.h
/* A status looks like:
<2 bytes info> <2 bytes code>
<code> == 0, child has exited, info is the exit value
<code> == 1..7e, child has exited, info is the signal number.
<code> == 7f, child has stopped, info was the signal number.
<code> == 80, there was a core dump.
*/
*status = (wcode&0xffff) | ((winfo&0xffff)<<16);
#elif defined(_MSC_VER)
#pragma message ( "Undefined status format for Microsoft compiler. Defaulting to MINGW32-style status-format." )
*status = (wcode&0xffff) | ((winfo&0xffff)<<16);
#else
#error "Unsupported status format."
#endif
break;
}
return wpid;
}
_pfd
native_dup(_pfd oldd)
{
HANDLE fd, res;
HANDLE hProcess = GetCurrentProcess();
if (_from_descriptor(oldd, &fd) == -1)
return (_pfd)-1;
if (!DuplicateHandle(hProcess, fd, hProcess, &res, 0, TRUE, DUPLICATE_SAME_ACCESS))
return (_pfd)-1;
assert(((intptr_t)res & 3) != (intptr_t)res); // ensure that returned handle is not a magic value (should be aligned to 4 anyways)
return (_pfd)res;
}
_pfd
native_dup2(_pfd oldd, _pfd newd)
{
HANDLE hTarget;
HANDLE res;
if (_from_descriptor(newd, &hTarget) == 0)
CloseHandle(hTarget);
res = (HANDLE) native_dup(oldd);
if (_to_descriptor(res, newd) == -1)
return (_pfd)-1;
return (_pfd)res;
}
int
_open_dev(const char* device_path, int flags, mode_t mode)
{
// FIXME: open up a device, and then call cygwin_attach_handle_to_fd
return open(device_path, flags, mode);
}
int
native_open(const char* path, int flags, ...)
{
// magic for file path prefixes
static const char* Dev_prefix = "/dev/";
va_list va; mode_t mode;
// figure out the mode_t
if (flags & O_CREAT) {
va_start(va, flags);
mode = va_arg(va, mode_t);
va_end(va);
} else {
mode = umask(0); (void)umask(mode);
}
// check if we're trying to open a special path, if not..then passthrough.
// XXX: implement something table based so we can do /sys/ and /proc/
if (memcmp(path, Dev_prefix, sizeof(Dev_prefix)-1) != 0)
return open(path, flags, mode);
// we're opening up /dev/
return _open_dev(path, flags, mode);
}
ssize_t
native_read(_pfd fd, void* buf, size_t nbytes)
{
DWORD sz; HANDLE _fd;
assert(buf != NULL);
if (_from_descriptor(fd, &_fd) == -1)
return -1;
if (ReadFile(_fd, buf, nbytes, &sz, NULL) == FALSE) {
errno = EIO; // XXX
return -1;
}
return sz;
}
ssize_t
native_write(_pfd fd, const void* buf, size_t nbytes)
{
DWORD sz; HANDLE _fd;
assert(buf != NULL);
if (_from_descriptor(fd, &_fd) == -1)
return -1;
if (WriteFile(_fd, buf, nbytes, &sz, NULL) == FALSE) {
errno = EIO; // XXX
return -1;
}
return sz;
}
int
native_close(_pfd fd)
{
HANDLE _fd;
if (_from_descriptor(fd, &_fd) == -1)
return -1;
return CloseHandle(_fd)? 0 : -1;
}
int
//native_pipe(_pfd fildes[2])
native_pipe(_pfd* fildes)
{
SECURITY_ATTRIBUTES attr;
HANDLE _fildes[2];
assert(fildes != NULL);
attr.nLength = sizeof(attr);
attr.lpSecurityDescriptor = NULL;
attr.bInheritHandle = TRUE;
if (CreatePipe(&_fildes[0], &_fildes[1], &attr, 0) == 0)
return -1;
if (SetHandleInformation(_fildes[0], HANDLE_FLAG_INHERIT, 0) == 0) {
CloseHandle(_fildes[0]); CloseHandle(_fildes[1]);
return -1;
}
#ifdef __CYGWIN__
// FIXME: int cygwin_attach_handle_to_fd(char* name, int fd, HANDLE handle, mode_t bin, DWORD myaccess)
#endif
fildes[0] = (_pfd)_fildes[0]; fildes[1] = (_pfd)_fildes[1];
return 0;
}
int
native_execv(const char* path, char* const argv[])
{
return native_execve(path, argv, environ);
}
int
native_execve(const char* posixpath, char* const argv[], char*const envp[])
{
static const char delimiter[] = " ";
static const char terminator[] = "\x00";
char* commandline, *environment;
STARTUPINFO si; PROCESS_INFORMATION pi;
DWORD exitCode;
char*const* p; size_t length;
char* path;
#ifdef __CYGWIN__
ssize_t cygsz;
char* cygpath;
#endif
memset(&si, 0, sizeof(si));
memset(&pi, 0, sizeof(pi));
#ifdef __CYGWIN__
// convert from posix path to windows path
cygsz = cygwin_conv_path(CCP_POSIX_TO_WIN_A, posixpath, NULL, 0);
if (cygsz < 0)
goto fail;
cygpath = malloc(cygsz);
if (cygpath == NULL)
goto fail;
if (cygwin_conv_path(CCP_POSIX_TO_WIN_A, posixpath, cygpath, cygsz) < 0) {
free(cygpath);
goto fail;
}
path = cygpath;
#else
path = strdup(posixpath);
if (path == NULL)
goto fail;
#endif
// build commandline
length = strlen(path)+sizeof(delimiter);
if (argv[0])
for (p = &argv[1]; *p != NULL; p++)
length += strlen(*p) + sizeof(delimiter);
commandline = malloc(length);
if (commandline == NULL) {
errno = ENOMEM;
goto fail;
}
strcpy(commandline, path);
if (argv[0])
for (p = &argv[1]; *p != NULL; p++) {
strcat(commandline, delimiter);
strcat(commandline, *p);
}
// build environment
length = sizeof(terminator)*2;
for (p = &envp[0]; *p != NULL; p++)
length += strlen(*p) + sizeof("");
environment = malloc(length);
if (environment == NULL) {
errno = ENOMEM;
goto fail_commandline;
}
length = 0;
for (p = &envp[0]; *p != NULL; p++) {
strcpy(&environment[length], *p);
length += strlen(*p) + sizeof("");
}
memcpy(&environment[length], terminator, sizeof(terminator)); length += sizeof(terminator);
memcpy(&environment[length], terminator, sizeof(terminator)); length += sizeof(terminator);
// create the process
si.cb = sizeof(si);
// XXX: maybe we should hollow out our process in order to preserve our pid..
// or we could figure out how to map to cygwin's task<->pid table
if (CreateProcess(NULL, commandline, NULL, NULL, TRUE, 0,
environment, NULL, &si, &pi) == FALSE)
{
errno = GetLastError();
goto fail_environment;
}
do {
WaitForSingleObject(pi.hProcess, INFINITE);
GetExitCodeProcess(pi.hProcess, &exitCode);
} while (exitCode != STILL_ACTIVE);
CloseHandle(pi.hProcess); CloseHandle(pi.hThread);
ExitProcess(exitCode);
DebugBreak();
fail_environment:
free(environment);
fail_commandline:
free(commandline);
free(path);
fail:
return -1;
}
int
native_execvp(const char *file, char *const argv[])
{
int res;
char* path;
res = where(file, &path);
if (res == -1)
return -1;
if (res < 0) {
errno = ENOENT;
goto fail;
}
res = native_execv(path, argv);
free(path);
return res;
fail:
if (path) free(path);
return -1;
}
_pid_t
native_setsid(void)
{
return (_pid_t)-1;
}
int
native_kill(_pid_t pid, int sig)
{
UINT code;
HANDLE _pid = (HANDLE) pid;
if (!pid || (pid == INVALID_HANDLE_VALUE)) {
errno = EINVAL;
return -1;
}
// XXX: map sig to an exit code
code = sig;
switch(sig) {
case SIGUSR1: case SIGUSR2:
code |= 0x200;
break;
case SIGABRT: case SIGQUIT: case SIGTERM: case SIGKILL:
code |= 0x80000000;
break;
default:
code |= 0xc0000000;
}
if (TerminateProcess(_pid, code) == FALSE) {
errno = GetLastError();
return -1;
}
return 0;
}
/** shm internals */
struct _shm_cache {
int identifier;
HANDLE handle;
struct _shm_cache* next;
void* _address;
DWORD _access;
};
#define SHM_PREFIX "winapi-shm-"
// wraps _shm_tail out of the global namespace
struct _shm_cache*
__shm_get(int index)
{
static struct _shm_cache _shm_head = { -1, INVALID_HANDLE_VALUE, NULL };
struct _shm_cache* p = &_shm_head;
while ((index-- > 0) && (p != NULL))
p = p->next;
return p;
}
struct _shm_cache*