frodo-wii/Src/CmdPipe.cpp

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2009-01-13 19:46:42 +01:00
/*
* CmdPipe.cpp
*
* Frodo (C) 1994-1997,2002-2005 Christian Bauer
*
* 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.
*
* 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "CmdPipe.h"
extern "C" {
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <string.h>
#include <signal.h>
#if defined(__alpha__)
#include <cma.h>
#endif
#if defined(AIX)
#include <sys/select.h>
#else
#include <unistd.h>
#endif
#if defined(__linux__)
#include <sys/time.h>
#endif
#include <time.h>
#include <errno.h>
}
static void kaputt(const char * c1, const char * c2) {
fprintf(stderr,"error: %s%s\n",c1,c2);
exit(20);
}
Pipe::Pipe(void) : fail(true) {
fds[0] = 0;
fds[1] = 1;
if (-1 == pipe(fds)) {
kaputt("Pipe: ","unable to create pipe");
return;
}
fail = false;
return;
}
Pipe::~Pipe(void) {
if (! fail) {
close(fds[0]);
close(fds[1]);
}
return;
}
unsigned long Pipe::ewrite(const void * buf, unsigned long len) {
unsigned long wsum = 0;
while (len) {
long wlen;
wlen = ::write(fds[1], buf, (long) len);
if (wlen <= 0) {
kaputt("Pipe::ewrite ","write-error");
}
len -= wlen;
buf = (void*) ((char*) buf + wlen);
wsum += wlen;
}
return wsum;
}
unsigned long Pipe::eread(void * buf, unsigned long len) {
unsigned long rsum = 0;
while (len) {
long rlen;
rlen = ::read(fds[0], buf, (long) len);
if (rlen <= 0) {
kaputt("Pipe::eread ","read-error");
}
len -= rlen;
buf = (void*) ((char*) buf + rlen);
rsum += rlen;
}
return rsum;
}
int Pipe::probe(void) const {
fd_set set;
FD_ZERO(&set);
FD_SET(fds[0], &set);
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
int res;
// Use the following commented line for HP-UX < 10.20
// res = select(FD_SETSIZE, (int *)&set, (int *)0, (int *)0, &tv);
res = select(FD_SETSIZE, &set, (fd_set *)0, (fd_set *)0, &tv);
if (res > 0) return -1;
return 0;
}
CmdPipe::CmdPipe(const char * command, const char * arg, int nicediff) : childpid(0), fail(true) {
if (tocmd.fail || fromcmd.fail) {
kaputt("CmdPipe: ","unable to initialize pipes");
return;
}
childpid = fork();
if (childpid == -1) {
childpid = 0;
kaputt("CmdPipe: ","unable to fork process");
return;
}
if (childpid == 0) {
if (nicediff) {
if (-1 == nice(nicediff)) {
fprintf(stderr,"CmdPipe: unable to change nice-level (non-fatal)");
}
}
dup2(tocmd.get_read_fd(), STDIN_FILENO);
dup2(fromcmd.get_write_fd(), STDOUT_FILENO);
execlp(command, "Frodo_GUI", arg, (char *)0);
kaputt("CmdPipe: unable to execute child process ",command);
_exit(0); // exit (and do NOT call destructors etc..)
}
fail = false;
return;
}
CmdPipe::~CmdPipe(void) {
if (childpid) {
int status;
waitpid(childpid, &status, 0);
if (status != 0) {
fprintf(stderr,"~CmdPipe child process returned error\n");
}
}
}