182 lines
3.7 KiB
C++
182 lines
3.7 KiB
C++
/*
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* CmdPipe.cpp
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*
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* Frodo (C) 1994-1997,2002-2005 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "CmdPipe.h"
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extern "C" {
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <string.h>
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#include <signal.h>
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#if defined(__alpha__)
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#include <cma.h>
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#endif
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#if defined(AIX)
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#include <sys/select.h>
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#else
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#include <unistd.h>
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#endif
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#if defined(__linux__)
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#include <sys/time.h>
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#endif
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#include <time.h>
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#include <errno.h>
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}
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static void kaputt(const char * c1, const char * c2) {
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fprintf(stderr,"error: %s%s\n",c1,c2);
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exit(20);
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}
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Pipe::Pipe(void) : fail(true) {
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fds[0] = 0;
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fds[1] = 1;
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if (-1 == pipe(fds)) {
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kaputt("Pipe: ","unable to create pipe");
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return;
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}
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fail = false;
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return;
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}
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Pipe::~Pipe(void) {
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if (! fail) {
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close(fds[0]);
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close(fds[1]);
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}
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return;
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}
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unsigned long Pipe::ewrite(const void * buf, unsigned long len) {
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unsigned long wsum = 0;
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while (len) {
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long wlen;
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wlen = ::write(fds[1], buf, (long) len);
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if (wlen <= 0) {
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kaputt("Pipe::ewrite ","write-error");
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}
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len -= wlen;
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buf = (void*) ((char*) buf + wlen);
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wsum += wlen;
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}
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return wsum;
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}
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unsigned long Pipe::eread(void * buf, unsigned long len) {
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unsigned long rsum = 0;
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while (len) {
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long rlen;
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rlen = ::read(fds[0], buf, (long) len);
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if (rlen <= 0) {
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kaputt("Pipe::eread ","read-error");
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}
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len -= rlen;
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buf = (void*) ((char*) buf + rlen);
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rsum += rlen;
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}
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return rsum;
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}
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int Pipe::probe(void) const {
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fd_set set;
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FD_ZERO(&set);
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FD_SET(fds[0], &set);
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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int res;
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// Use the following commented line for HP-UX < 10.20
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// res = select(FD_SETSIZE, (int *)&set, (int *)0, (int *)0, &tv);
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res = select(FD_SETSIZE, &set, (fd_set *)0, (fd_set *)0, &tv);
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if (res > 0) return -1;
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return 0;
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}
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CmdPipe::CmdPipe(const char * command, const char * arg, int nicediff) : childpid(0), fail(true) {
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if (tocmd.fail || fromcmd.fail) {
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kaputt("CmdPipe: ","unable to initialize pipes");
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return;
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}
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childpid = fork();
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if (childpid == -1) {
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childpid = 0;
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kaputt("CmdPipe: ","unable to fork process");
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return;
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}
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if (childpid == 0) {
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if (nicediff) {
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if (-1 == nice(nicediff)) {
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fprintf(stderr,"CmdPipe: unable to change nice-level (non-fatal)");
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}
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}
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dup2(tocmd.get_read_fd(), STDIN_FILENO);
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dup2(fromcmd.get_write_fd(), STDOUT_FILENO);
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execlp(command, "Frodo_GUI", arg, (char *)0);
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kaputt("CmdPipe: unable to execute child process ",command);
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_exit(0); // exit (and do NOT call destructors etc..)
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}
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fail = false;
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return;
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}
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CmdPipe::~CmdPipe(void) {
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if (childpid) {
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int status;
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waitpid(childpid, &status, 0);
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if (status != 0) {
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fprintf(stderr,"~CmdPipe child process returned error\n");
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}
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}
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}
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