Create pipe using OW _pipe:<\/strong><\/p>\n Make handle non-inheritable if read or write:<\/strong><\/p>\n rc =\u00a0DosSetFHandState<\/a>( (HFILE)_os_handle(handles[0]), handleState );<\/p>\n<\/div>\n Create the pipe’s FILE:<\/strong><\/p>\n Spawn the process:<\/strong><\/p>\n If write –\u00a0 <\/p>\n Synopsis:<\/strong>\u00a0<\/p>\n #include <stdio.h>\u00a0 Description:<\/strong>\u00a0 Depending on the mode argument, the stream pointer returned may be used to read from or write to the pipe.\u00a0<\/p>\n The executed command has an environment the same as its parents. The command will be started as follows: spawnl(<shell_path>, <shell>, “-c”, command, (char *)NULL);\u00a0<\/p>\n
Search in API for DosQueryFHState instead of DosQFHandState<\/strong><\/em>
16-bit\u00a0DosQFHandState<\/a>\u00a032-bit\u00a0DosQueryFHState<\/a>\u00a0
They are both the same function, see bsedos.h.<\/div>\n
handleState &= 0x00007F88; \/* some bits must be zero *\/ 0111111110001000<\/p>\n
Search in API for DosSetFHState instead of DosSetFHandState<\/strong><\/em>
16-bit\u00a0DosSetFHandState<\/a>\u00a032-bit\u00a0DosSetFHState<\/a>\u00a0
They are both the same function, see bsedos.h.<\/div>\n
_FP_PIPEDATA(fp).isPipe = 1;
_FP_PIPEDATA(fp).pid = -1;
\/lib_misc\/h\/rtdata.h: #define _FP_PIPEDATA(__fp<\/a>) ((__fp<\/a>)->_link->pipeInfo)<\/em><\/div>\n
\u00a0<\/div>\n
static int connect_pipe( FILE *fp<\/a>, const CHAR_TYPE *command, int *handles,<\/em>
int readOrWrite, int textOrBinary )<\/em><\/p>\n
oldHandle = 0xFFFFFFFF; \/* duplicate standard input *\/
rc =\u00a0DosDupHandle<\/a>( STDIN_HANDLE, &oldHandle );
if( rc != NO_ERROR ) {
return( 0 );
}\u00a0
osHandle = STDIN_HANDLE; \/* use new standard input *\/
rc =\u00a0DosDupHandle<\/a>( (HFILE)_os_handle(handles[0]), &osHandle );
if( rc != NO_ERROR ) {
DosClose<\/a>( oldHandle );
return( 0 );
}<\/p>\n<\/div>\n
oldHandle = 0xFFFFFFFF; \/* duplicate standard input *\/
rc =\u00a0DosDupHandle<\/a>( STDOUT_HANDLE, &oldHandle );
if( rc != NO_ERROR ) {
return( 0 );
}
osHandle = STDOUT_HANDLE; \/* use new standard input *\/
rc =\u00a0DosDupHandle<\/a>( (HFILE)_os_handle(handles[1]), &osHandle );
if( rc != NO_ERROR ) {
DosClose<\/a>( oldHandle );
return( 0 );
}<\/div>\n
if( spawn_it(\u00a0fp<\/a>, command ) == 0 ) {
return( 0 );
}
spawn_it summary:
Sets up spawnvp (P_NOWAIT) for execution. Problem here is that uses CMD.EXE under NT and OS\/2, and COMMAND.COM under Win95.\u00a0
After executing spawnvp _FP_PIPEDATA(fp).pid to set pid.<\/div>\n
osHandle = STDOUT_HANDLE;
rc =\u00a0DosDupHandle<\/a>( oldHandle, &osHandle );
close( handles[1] ); \/* parent process should close this *\/<\/div>\n
return(\u00a0fp<\/a>\u00a0)<\/div>\n
\n
FILE *_popen( const char *command, const char *mode );\u00a0
FILE *_wpopen( const wchar_t *command, const wchar_t *mode );\u00a0<\/p>\n
The _popen function executes the command specified by command and creates a pipe between the calling process and the executed command.\u00a0<\/p>\n