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/*
* Copyright (c) Tony Bybell 2005-2010
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*/
#include "globals.h"
#include <config.h>
#include "pipeio.h"
#if defined _MSC_VER || defined __MINGW32__
static void cleanup_p(struct pipe_ctx *p)
{
if(p->g_hChildStd_IN_Rd) CloseHandle(p->g_hChildStd_IN_Rd);
if(p->g_hChildStd_IN_Wr) CloseHandle(p->g_hChildStd_IN_Wr);
if(p->g_hChildStd_OUT_Rd) CloseHandle(p->g_hChildStd_OUT_Rd);
if(p->g_hChildStd_OUT_Wr) CloseHandle(p->g_hChildStd_OUT_Wr);
free_2(p);
}
struct pipe_ctx *pipeio_create(char *execappname, char *args)
{
SECURITY_ATTRIBUTES saAttr;
STARTUPINFO siStartInfo;
BOOL bSuccess = FALSE;
TCHAR *szCmdline;
struct pipe_ctx *p = calloc_2(1, sizeof(struct pipe_ctx));
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES); /* Set the bInheritHandle flag so pipe handles are inherited */
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
if (!CreatePipe(&p->g_hChildStd_OUT_Rd, &p->g_hChildStd_OUT_Wr, &saAttr, 0)) { cleanup_p(p); return(NULL); }
if (!SetHandleInformation(p->g_hChildStd_OUT_Rd, HANDLE_FLAG_INHERIT, 0)) { cleanup_p(p); return(NULL); }
if (!CreatePipe(&p->g_hChildStd_IN_Rd, &p->g_hChildStd_IN_Wr, &saAttr, 0)) { cleanup_p(p); return(NULL); }
if (!SetHandleInformation(p->g_hChildStd_IN_Wr, HANDLE_FLAG_INHERIT, 0)) { cleanup_p(p); return(NULL); }
memset(&siStartInfo, 0, sizeof(STARTUPINFO));
siStartInfo.cb = sizeof(STARTUPINFO);
/* siStartInfo.hStdError = p->g_hChildStd_OUT_Wr; (not sure how to redirect, for example GetStdHandle(STD_ERROR_HANDLE) */
siStartInfo.hStdOutput = p->g_hChildStd_OUT_Wr;
siStartInfo.hStdInput = p->g_hChildStd_IN_Rd;
siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
if (strlen(args) == 0)
{
szCmdline = strdup_2(execappname);
}
else
{
szCmdline = malloc_2(strlen(execappname) + 1 + strlen(args) + 1);
sprintf(szCmdline, "%s %s", execappname, args);
}
bSuccess = CreateProcess(NULL,
szCmdline, /* command line */
NULL, /* process security attributes */
NULL, /* primary thread security attributes */
TRUE, /* handles are inherited */
0, /* creation flags */
NULL, /* use parent's environment */
NULL, /* use parent's current directory */
&siStartInfo, /* STARTUPINFO pointer */
&p->piProcInfo); /* receives PROCESS_INFORMATION */
free_2(szCmdline);
if(!bSuccess)
{
cleanup_p(p); return(NULL);
}
else
{
/* CloseHandle(p->piProcInfo.hProcess); */
/* CloseHandle(p->piProcInfo.hThread); */
}
return(p);
}
void pipeio_destroy(struct pipe_ctx *p)
{
CloseHandle(p->g_hChildStd_IN_Rd);
CloseHandle(p->g_hChildStd_IN_Wr);
CloseHandle(p->g_hChildStd_OUT_Rd);
CloseHandle(p->g_hChildStd_OUT_Wr);
TerminateProcess(p->piProcInfo.hProcess, 0);
free_2(p);
}
#else
#include <sys/wait.h>
struct pipe_ctx *pipeio_create(char *execappname, char *arg)
{
int rc1, rc2;
pid_t pid, wave_pid;
int filedes_w[2];
int filedes_r[2];
struct pipe_ctx *p;
int mystat;
FILE *fsin=NULL, *fsout = NULL;
rc1 = pipe(filedes_r);
if(rc1) return(NULL);
rc2 = pipe(filedes_w);
if(rc2) { close(filedes_r[0]); close(filedes_r[1]); return(NULL); }
wave_pid = getpid();
if((pid=fork()))
{
fsout = fdopen(filedes_w[1], "wb");
fsin = fdopen(filedes_r[0], "rb");
close(filedes_w[0]);
close(filedes_r[1]);
}
else
{
dup2(filedes_w[0], 0);
dup2(filedes_r[1], 1);
close(filedes_w[1]);
close(filedes_r[0]);
#ifdef _AIX
/* NOTE: doesn't handle ctrl-c or killing, but I don't want to mess with this right now for AIX */
if ((!arg)||(strlen(arg) == 0)) {
execl(execappname, execappname, NULL);
} else {
execl(execappname, execappname, arg, NULL);
}
exit(0);
#else
if((pid=fork())) /* monitor process */
{
do {
sleep(1);
} while(wave_pid == getppid()); /* inherited by init yet? */
kill(pid, SIGKILL);
waitpid(pid, &mystat, 0);
exit(0);
}
else /* actual helper */
{
if (strlen(arg) == 0) {
execl(execappname, execappname, NULL);
} else {
execl(execappname, execappname, arg, NULL);
}
exit(0);
}
#endif
}
p = malloc_2(sizeof(struct pipe_ctx));
p->pid = pid;
p->sin = fsin;
p->sout = fsout;
p->fd0 = filedes_r[0]; /* for potential select() ops */
p->fd1 = filedes_w[1]; /* ditto */
return(p);
}
void pipeio_destroy(struct pipe_ctx *p)
{
/* #ifdef _AIX */
int mystat;
kill(p->pid, SIGKILL);
waitpid(p->pid, &mystat, 0);
/* #endif */
fclose(p->sout);
fclose(p->sin);
free_2(p);
}
#endif
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