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/* Pipestream: A simple C++ interface to UNIX pipes
Copyright (C) 2005-2014 John C. Bowman,
with contributions from Mojca Miklavec
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <iostream>
#include <cstring>
#include <cerrno>
#include <sstream>
#include <signal.h>
#include "pipestream.h"
#include "common.h"
#include "errormsg.h"
#include "settings.h"
#include "util.h"
#include "interact.h"
#include "lexical.h"
#include "camperror.h"
#include "pen.h"
void iopipestream::open(const mem::vector<string> &command, const char *hint,
const char *application, int out_fileno)
{
if(pipe(in) == -1) {
ostringstream buf;
buf << "in pipe failed: ";
for(size_t i=0; i < command.size(); ++i) buf << command[i];
camp::reportError(buf);
}
if(pipe(out) == -1) {
ostringstream buf;
buf << "out pipe failed: ";
for(size_t i=0; i < command.size(); ++i) buf << command[i];
camp::reportError(buf);
}
cout.flush(); // Flush stdout to avoid duplicate output.
if((pid=fork()) < 0) {
ostringstream buf;
buf << "fork failed: ";
for(size_t i=0; i < command.size(); ++i) buf << command[i];
camp::reportError(buf);
}
if(pid == 0) {
if(interact::interactive) signal(SIGINT,SIG_IGN);
close(in[1]);
close(out[0]);
close(STDIN_FILENO);
close(out_fileno);
dup2(in[0],STDIN_FILENO);
dup2(out[1],out_fileno);
close(in[0]);
close(out[1]);
char **argv=args(command);
if(argv) execvp(argv[0],argv);
execError(argv[0],hint,application);
kill(0,SIGTERM);
_exit(-1);
}
close(out[1]);
close(in[0]);
*buffer=0;
pipeopen=true;
pipein=true;
Running=true;
block(false,true);
}
void iopipestream::eof()
{
if(pipeopen && pipein) {
close(in[1]);
pipein=false;
}
}
void iopipestream::pipeclose()
{
if(pipeopen) {
kill(pid,SIGTERM);
eof();
close(out[0]);
Running=false;
pipeopen=false;
waitpid(pid,NULL,0); // Avoid zombies.
}
}
void iopipestream::block(bool write, bool read)
{
if(pipeopen) {
int w=fcntl(in[1],F_GETFL);
int r=fcntl(out[0],F_GETFL);
fcntl(in[1],F_SETFL,write ? w & ~O_NONBLOCK : w | O_NONBLOCK);
fcntl(out[0],F_SETFL,read ? r & ~O_NONBLOCK : r | O_NONBLOCK);
}
}
ssize_t iopipestream::readbuffer()
{
ssize_t nc;
char *p=buffer;
ssize_t size=BUFSIZE-1;
errno=0;
for(;;) {
if((nc=read(out[0],p,size)) < 0) {
if(errno == EAGAIN) {p[0]=0; break;}
else camp::reportError("read from pipe failed");
nc=0;
}
p[nc]=0;
if(nc == 0) {
if(waitpid(pid,NULL,WNOHANG) == pid)
Running=false;
break;
}
if(nc > 0) {
if(settings::verbose > 2) cerr << p;
break;
}
}
return nc;
}
bool iopipestream::tailequals(const char *buf, size_t len, const char *prompt,
size_t plen)
{
const char *a=buf+len;
const char *b=prompt+plen;
while(b >= prompt) {
if(a < buf) return false;
if(*a != *b) return false;
// Handle MSDOS incompatibility:
if(a > buf && *a == '\n' && *(a-1) == '\r') --a;
--a; --b;
}
return true;
}
string iopipestream::readline()
{
sbuffer.clear();
int nc;
do {
nc=readbuffer();
sbuffer.append(buffer);
} while(buffer[nc-1] != '\n' && Running);
return sbuffer;
}
void iopipestream::wait(const char *prompt)
{
sbuffer.clear();
size_t plen=strlen(prompt);
do {
readbuffer();
sbuffer.append(buffer);
} while(!tailequals(sbuffer.c_str(),sbuffer.size(),prompt,plen));
}
int iopipestream::wait()
{
for(;;) {
int status;
if (waitpid(pid,&status,0) == -1) {
if (errno == ECHILD) return 0;
if (errno != EINTR) {
ostringstream buf;
buf << "Process " << pid << " failed";
camp::reportError(buf);
}
} else {
if(WIFEXITED(status)) return WEXITSTATUS(status);
else {
ostringstream buf;
buf << "Process " << pid << " exited abnormally";
camp::reportError(buf);
}
}
}
}
void iopipestream::Write(const string &s)
{
ssize_t size=s.length();
if(settings::verbose > 2) cerr << s;
if(write(in[1],s.c_str(),size) != size) {
camp::reportFatal("write to pipe failed");
}
}
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