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