/*
** Copyright (c) 2010 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
** This program is distributed in the hope that it will be useful,
** but without any warranty; without even the implied warranty of
** merchantability or fitness for a particular purpose.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains an implementation of a bi-directional popen().
*/
#include "config.h"
#include "popen.h"
/*
** Create a child process running shell command "zCmd". *ppOut is
** a FILE that becomes the standard input of the child process.
** (The caller writes to *ppOut in order to send text to the child.)
** *ppIn is stdout from the child process. (The caller
** reads from *ppIn in order to receive input from the child.)
** Note that *ppIn is an unbuffered file descriptor, not a FILE.
** The process ID of the child is written into *pChildPid.
**
** Return the number of errors.
*/
int popen2(const char *zCmd, int *pfdIn, FILE **ppOut, int *pChildPid){
#ifdef __MINGW32__
return 1; /* Not implemented on windows, yet */
#else
int pin[2], pout[2];
*pfdIn = 0;
*ppOut = 0;
*pChildPid = 0;
if( pipe(pin)<0 ){
return 1;
}
if( pipe(pout)<0 ){
close(pin[0]);
close(pin[1]);
return 1;
}
*pChildPid = fork();
if( *pChildPid<0 ){
close(pin[0]);
close(pin[1]);
close(pout[0]);
close(pout[1]);
*pChildPid = 0;
return 1;
}
if( *pChildPid==0 ){
/* This is the child process */
close(0);
dup(pout[0]);
close(pout[0]);
close(pout[1]);
close(1);
dup(pin[1]);
close(pin[0]);
close(pin[1]);
execl("/bin/sh", "/bin/sh", "-c", zCmd, (char*)0);
return 1;
}else{
/* This is the parent process */
close(pin[1]);
*pfdIn = pin[0];
close(pout[0]);
*ppOut = fdopen(pout[1], "w");
return 0;
}
#endif
}
/*
** Close the connection to a child process previously created using
** popen2(). Kill off the child process, then close the pipes.
*/
void pclose2(int fdIn, FILE *pOut, int childPid){
#ifdef __MINGW32__
/* Not implemented, yet */
#else
kill(childPid, SIGINT);
close(fdIn);
fclose(pOut);
#endif
}