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/***
*dospawn.c - spawn a child process** Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.**Purpose:* defines _dospawn - spawn a child process**Revision History:* 06-07-89 PHG Module created, based on asm version* 03-08-90 GJF Made calling type _CALLTYPE2 (for now), added #include* <cruntime.h> and fixed the copyright. Also, cleaned* up the formatting a bit.* 04-02-90 GJF Now _CALLTYPE1. Added const to type of name arg.* 07-24-90 SBM Removed '32' from API names* 09-27-90 GJF New-style function declarator.* 10-30-90 GJF Added _p_overlay (temporary hack).* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>* 12-06-90 SRW Added _CRUISER_ and _WIN32 conditionals.* 01-16-91 SRW Fixed return value for dospawn [_WIN32_]* 01-17-91 GJF ANSI naming.* 01-25-91 SRW Changed CreateProcess parameters [_WIN32_]* 01-29-91 SRW Changed CreateProcess parameters again [_WIN32_]* 02-05-91 SRW Changed to pass _osfile and _osfhnd arrays as binary* data to child process. [_WIN32_]* 02-18-91 SRW Fixed code to return correct process handle and close* handle for P_WAIT case. [_WIN32_]* 04-05-91 SRW Fixed code to free StartupInfo.lpReserved2 after* CreateProcess call. [_WIN32_]* 04-26-91 SRW Removed level 3 warnings (_WIN32_)* 12-02-91 SRW Fixed command line setup code to not append an extra* space [_WIN32_]* 12-16-91 GJF Return full 32-bit exit code from the child process* [_WIN32_].* 02-14-92 GJF Replaced _nfile with _nhandle for Win32.* 02-18-92 GJF Merged in 12-16-91 change from \\vangogh version* 11-20-92 SKS errno/_doserrno must be 0 in case of success. This* will distinguish a child process return code of -1L* (errno == 0) from an actual error (where errno != 0).* 01-08-93 CFW Added code to handle _P_DETACH case; add fdwCreate* variable, nuke stdin, stdout, stderr entries of _osfile* & _osfhnd tables, close process handle to completely* detach process* 04-06-93 SKS Replace _CRTAPI* with __cdecl* 12-07-93 CFW Rip out Cruiser.* 12-07-93 CFW Wide char enable, remove _p_overlay.* 01-05-94 CFW Unremove _p_overlay.* 01-10-95 CFW Debug CRT allocs.* 06-12-95 GJF Revised passing of C file handles to work from the* ioinfo arrays.* 07-10-95 GJF Use UNALIGNED to avoid choking RISC platforms.* 05-17-96 GJF Don't pass info on handles marked FNOINHERIT (new * flag) to the child process.* 02-05-98 GJF Changes for Win64: return type changed to intptr_t.* 01-09-00 PML Sign-extend exit code for _P_WAIT on Win64.* 07-07-01 BWT Return -1 if unable to alloc file ptr table (lpReserved2).********************************************************************************/
#include <cruntime.h>
#include <oscalls.h>
#include <internal.h>
#include <msdos.h>
#include <process.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <tchar.h>
#include <dbgint.h>
#ifndef WPRFLAG
int _p_overlay = 2;#endif
/***
*int _dospawn(mode, name, cmdblk, envblk) - spawn a child process**Purpose:* Spawns a child process**Entry:* int mode - _P_WAIT, _P_NOWAIT, _P_NOWAITO, _P_OVERLAY, or _P_DETACH* _TSCHAR *name - name of program to execute* _TSCHAR *cmdblk - parameter block* _TSCHAR *envblk - environment block**Exit:* _P_OVERLAY: -1 = error, otherwise doesn't return* _P_WAIT: termination code << 8 + result code* _P_DETACH: -1 = error, 0 = success* others: PID of process**Exceptions:********************************************************************************/
#ifdef WPRFLAG
intptr_t __cdecl _wdospawn (#else
intptr_t __cdecl _dospawn (#endif
int mode, const _TSCHAR *name, _TSCHAR *cmdblk, _TSCHAR *envblk ){ char syncexec, asyncresult, background; LPTSTR CommandLine; STARTUPINFO StartupInfo; PROCESS_INFORMATION ProcessInformation; BOOL CreateProcessStatus; ULONG dosretval; /* OS return value */ DWORD exitcode; intptr_t retval; DWORD fdwCreate = 0; /* flags for CreateProcess */ int i; ioinfo *pio; char *posfile; UNALIGNED intptr_t *posfhnd; int nh; /* number of file handles to be
passed to the child */
/* translate input mode value to individual flags */ syncexec = asyncresult = background = 0; switch (mode) { case _P_WAIT: syncexec=1; break; /* synchronous execution */ case 2: /* _P_OVERLAY */ case _P_NOWAITO: break; /* asynchronous execution */ case _P_NOWAIT: asyncresult=1; break; /* asynch + remember result */ case _P_DETACH: background=1; break; /* detached in null scrn grp */ default: /* invalid mode */ errno = EINVAL; _doserrno = 0; /* not a Dos error */ return -1; }
/*
* Loop over null separate arguments, and replace null separators * with spaces to turn it back into a single null terminated * command line. */ CommandLine = cmdblk; while (*cmdblk) { while (*cmdblk) { cmdblk++; }
/*
* If not last argument, turn null separator into a space. */ if (cmdblk[1] != _T('\0')) { *cmdblk++ = _T(' '); } }
memset(&StartupInfo,0,sizeof(StartupInfo)); StartupInfo.cb = sizeof(StartupInfo);
for ( nh = _nhandle ; nh && !_osfile(nh - 1) ; nh-- ) ;
StartupInfo.cbReserved2 = (WORD)(sizeof( int ) + (nh * (sizeof( char ) + sizeof( intptr_t ))));
StartupInfo.lpReserved2 = _calloc_crt( StartupInfo.cbReserved2, 1 );
if (!StartupInfo.lpReserved2) { errno = ENOMEM; return -1; }
*((UNALIGNED int *)(StartupInfo.lpReserved2)) = nh;
for ( i = 0, posfile = (char *)(StartupInfo.lpReserved2 + sizeof( int )), posfhnd = (UNALIGNED intptr_t *)(StartupInfo.lpReserved2 + sizeof( int ) + (nh * sizeof( char ))) ; i < nh ; i++, posfile++, posfhnd++ ) { pio = _pioinfo(i); if ( (pio->osfile & FNOINHERIT) == 0 ) { *posfile = pio->osfile; *posfhnd = pio->osfhnd; } else { *posfile = 0; *posfhnd = (intptr_t)INVALID_HANDLE_VALUE; } }
/*
* if the child process is detached, it cannot access the console, so * we must nuke the information passed for the first three handles. */ if ( background ) {
for ( i = 0, posfile = (char *)(StartupInfo.lpReserved2 + sizeof( int )), posfhnd = (UNALIGNED intptr_t *)(StartupInfo.lpReserved2 + sizeof( int ) + (nh * sizeof( char ))) ; i < __min( nh, 3 ) ; i++, posfile++, posfhnd++ ) { *posfile = 0; *posfhnd = (intptr_t)INVALID_HANDLE_VALUE; }
fdwCreate |= DETACHED_PROCESS; }
/**
* Set errno to 0 to distinguish a child process * which returns -1L from an error in the spawning * (which will set errno to something non-zero **/
_doserrno = errno = 0 ;
#ifdef WPRFLAG
/* indicate to CreateProcess that environment block is wide */ fdwCreate |= CREATE_UNICODE_ENVIRONMENT;#endif
CreateProcessStatus = CreateProcess( (LPTSTR)name, CommandLine, NULL, NULL, TRUE, fdwCreate, envblk, NULL, &StartupInfo, &ProcessInformation );
dosretval = GetLastError(); _free_crt( StartupInfo.lpReserved2 );
if (!CreateProcessStatus) { _dosmaperr(dosretval); return -1; }
if (mode == 2 /* _P_OVERLAY */) { /* destroy ourselves */ _exit(0); } else if (mode == _P_WAIT) { WaitForSingleObject(ProcessInformation.hProcess, (DWORD)(-1L));
/* return termination code and exit code -- note we return
the full exit code */ GetExitCodeProcess(ProcessInformation.hProcess, &exitcode);
retval = (intptr_t)(int)exitcode;
CloseHandle(ProcessInformation.hProcess); } else if (mode == _P_DETACH) { /* like totally detached asynchronous spawn, dude,
close process handle, return 0 for success */ CloseHandle(ProcessInformation.hProcess); retval = (intptr_t)0; } else { /* asynchronous spawn -- return PID */ retval = (intptr_t)ProcessInformation.hProcess; }
CloseHandle(ProcessInformation.hThread); return retval;}
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