219 lines
7.8 KiB
C
219 lines
7.8 KiB
C
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/***
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*spawnvpe.c - spawn a child process with given environ (search PATH)
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _spawnvpe() - spawn a child process with given environ (search
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* PATH)
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*
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*Revision History:
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* 04-15-84 DFW written
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* 10-29-85 TC added spawnvpe capability
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* 11-19-86 SKS handle both kinds of slashes
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* 12-01-86 JMB added Kanji file name support under conditional KANJI
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* switches. Corrected header info. Removed bogus check
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* for env = b after call to strncpy
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 09-05-88 SKS Treat EACCES the same as ENOENT -- keep trying
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* 10-17-88 GJF Removed copy of PATH string to local array, changed
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* bbuf to be a malloc-ed buffer. Removed bogus limits
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* on the size of that PATH string.
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* 10-25-88 GJF Don't search PATH when relative pathname is given (per
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* Stevesa). Also, if the name built from PATH component
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* and filename is a UNC name, allow any error.
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* 05-17-89 MT Added "include <jstring.h>" under KANJI switch
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* 05-24-89 PHG Reduce _amblksiz to use minimal memory (DOS only)
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* 08-29-89 GJF Use _getpath() to retrieve PATH components, fixing
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* several problems in handling unusual or bizarre
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* PATH's.
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* 11-20-89 GJF Added const attribute to types of filename, argv and
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* envptr.
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* 03-08-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>
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* 07-24-90 SBM Removed redundant includes, replaced <assertm.h> by
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* <assert.h>
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* 09-27-90 GJF New-style function declarator.
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* 01-17-91 GJF ANSI naming.
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* 09-25-91 JCR Changed ifdef "OS2" to "_DOS_" (unused in 32-bit tree)
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* 11-30-92 KRS Port _MBCS code from 16-bit tree.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 12-07-93 CFW Wide char enable.
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* 01-10-95 CFW Debug CRT allocs.
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* 02-06-95 CFW assert -> _ASSERTE.
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* 02-06-98 GJF Changes for Win64: changed return type to intptr_t.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <malloc.h>
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#include <internal.h>
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#include <process.h>
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#include <mbstring.h>
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#include <tchar.h>
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#include <dbgint.h>
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#define SLASH _T("\\")
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#define SLASHCHAR _T('\\')
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#define XSLASHCHAR _T('/')
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#define DELIMITER _T(";")
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#ifdef _MBCS
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/* note, the macro below assumes p is to pointer to a single-byte character
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* or the 1st byte of a double-byte character, in a string.
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*/
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#define ISPSLASH(p) ( ((p) == _mbschr((p), SLASHCHAR)) || ((p) == \
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_mbschr((p), XSLASHCHAR)) )
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#else
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#define ISSLASH(c) ( ((c) == SLASHCHAR) || ((c) == XSLASHCHAR) )
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#endif
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/***
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*_spawnvpe(modeflag, filename, argv, envptr) - spawn a child process
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*
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*Purpose:
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* Spawns a child process with the given arguments and environ,
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* searches along PATH for given file until found.
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* Formats the parameters and calls _spawnve to do the actual work. The
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* NULL environment pointer indicates that the new process will inherit
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* the parents process's environment. NOTE - at least one argument must
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* be present. This argument is always, by convention, the name of the
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* file being spawned.
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*
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*Entry:
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* int modeflag - defines mode of spawn (WAIT, NOWAIT, or OVERLAY)
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* only WAIT and OVERLAY supported
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* _TSCHAR *filename - name of file to execute
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* _TSCHAR **argv - vector of parameters
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* _TSCHAR **envptr - vector of environment variables
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*
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*Exit:
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* returns exit code of spawned process
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* if fails, returns -1
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*
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*Exceptions:
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*
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*******************************************************************************/
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intptr_t __cdecl _tspawnvpe (
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int modeflag,
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REG3 const _TSCHAR *filename,
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const _TSCHAR * const *argv,
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const _TSCHAR * const *envptr
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)
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{
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intptr_t i;
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REG1 _TSCHAR *env;
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REG2 _TSCHAR *buf = NULL;
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_TSCHAR *pfin;
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#ifdef _DOS_
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int tempamblksiz; /* old _amblksiz */
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#endif
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_ASSERTE(filename != NULL);
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_ASSERTE(*filename != _T('\0'));
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_ASSERTE(argv != NULL);
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_ASSERTE(*argv != NULL);
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_ASSERTE(**argv != _T('\0'));
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#ifdef _DOS_
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tempamblksiz = _amblksiz;
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_amblksiz = 0x10; /* reduce _amblksiz for efficient mallocs */
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#endif
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if (
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(i = _tspawnve(modeflag, filename, argv, envptr)) != -1
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/* everything worked just fine; return i */
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|| (errno != ENOENT)
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/* couldn't spawn the process, return failure */
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|| (_tcschr(filename, XSLASHCHAR) != NULL)
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/* filename contains a '/', return failure */
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#ifdef _DOS_
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|| (_tcschr(filename,SLASHCHAR) != NULL)
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/* filename contains a '\', return failure */
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|| *filename && *(filename+1) == _T(':')
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/* drive specification, return failure */
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#endif
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|| !(env = _tgetenv(_T("PATH")))
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/* no PATH environment string name, return failure */
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|| ( (buf = _malloc_crt(_MAX_PATH * sizeof(_TSCHAR))) == NULL )
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/* cannot allocate buffer to build alternate pathnames, return
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* failure */
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) {
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#ifdef _DOS_
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_amblksiz = tempamblksiz; /* restore old _amblksiz */
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#endif
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goto done;
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}
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#ifdef _DOS_
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_amblksiz = tempamblksiz; /* restore old _amblksiz */
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#endif
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/* could not find the file as specified, search PATH. try each
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* component of the PATH until we get either no error return, or the
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* error is not ENOENT and the component is not a UNC name, or we run
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* out of components to try.
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*/
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#ifdef WPRFLAG
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while ( (env = _wgetpath(env, buf, _MAX_PATH - 1)) && (*buf) ) {
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#else
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while ( (env = _getpath(env, buf, _MAX_PATH - 1)) && (*buf) ) {
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#endif
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pfin = buf + _tcslen(buf) - 1;
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/* if necessary, append a '/'
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*/
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#ifdef _MBCS
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if (*pfin == SLASHCHAR) {
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if (pfin != _mbsrchr(buf,SLASHCHAR))
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/* fin is the second byte of a double-byte char */
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strcat(buf, SLASH );
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}
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else if (*pfin !=XSLASHCHAR)
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strcat(buf, SLASH);
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#else
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if (*pfin != SLASHCHAR && *pfin != XSLASHCHAR)
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_tcscat(buf, SLASH);
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#endif
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/* check that the final path will be of legal size. if so,
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* build it. otherwise, return to the caller (return value
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* and errno rename set from initial call to _spawnve()).
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*/
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if ( (_tcslen(buf) + _tcslen(filename)) < _MAX_PATH )
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_tcscat(buf, filename);
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else
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break;
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/* try spawning it. if successful, or if errno comes back with a
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* value other than ENOENT and the pathname is not a UNC name,
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* return to the caller.
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*/
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if ( (i = _tspawnve(modeflag, buf, argv, envptr)) != -1
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|| ((errno != ENOENT)
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#ifdef _MBCS
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&& (!ISPSLASH(buf) || !ISPSLASH(buf+1))) )
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#else
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&& (!ISSLASH(*buf) || !ISSLASH(*(buf+1)))) )
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#endif
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break;
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}
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done:
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if (buf != NULL)
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_free_crt(buf);
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return(i);
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}
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