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/*
Helper program to add modglue functionality to normal binaries.
Copyright (C) 2001-2009 Kasper Peeters <kasper.peeters@aei.mpg.de>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <string>
#include <iostream.h>
#include <strstream.h>
#include <stdexcept>
#include <algo.h>
#include <pair.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <modglue/mid.hh>
int sig_chld_pipe[2];
pid_t childpid_;
void sig_kill(int signo)
{
// This does of course not catch SIGKILL, that will still leave
// process adopted by init. But there is no way around that, apparently.
kill(childpid_, SIGTERM);
exit(-1);
}
void sig_chld(int signo)
{
int status;
pid_t childpid;
if((childpid=waitpid(-1, &status, WNOHANG)) < 0) {
throw logic_error("waitpid failed");
}
if(WIFEXITED(status)) {
int child_val = WEXITSTATUS(status);
write(sig_chld_pipe[1],&child_val,1);
}
else if(WIFSIGNALED(status)) {
int child_sig = WTERMSIG(status);
int buf[1];
buf[0]=-1;
write(sig_chld_pipe[1],buf,1);
}
}
int main(int argc, char **argv)
{
if(argc==1) {
cerr << "usage: modwrap [program] [options] ...." << endl << endl;
cerr << "Creates a set of pseudo tty devices for stdin/stdout/stderr of" << endl
<< "the given program, and maps them to the corresponding pipes of" << endl
<< "the ptywrap program, thereby fooling the program to think that" << endl
<< "it is always connected to a pseudo tty." << endl << endl
<< "example: isatty <in >out" << endl
<< " ptywrap isatty <in >out" << endl << endl
<< "info: message identifier size = " << sizeof(modglue::mid) << endl;
exit(1);
}
pair<int,string> p_stdin =open_pty_master();
pair<int,string> p_stdout=open_pty_master();
pair<int,string> p_stderr=open_pty_master();
if(pipe(sig_chld_pipe)!=0)
throw logic_error("cannot create sig_chld_pipe");
struct sigaction act;
act.sa_handler = sig_chld;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_NOCLDSTOP;
if(sigaction(SIGCHLD, &act, NULL) < 0) {
throw logic_error("sigaction failed");
}
act.sa_handler = sig_kill;
sigemptyset(&act.sa_mask);
if(sigaction(SIGTERM, &act, NULL) < 0) {
throw logic_error("sigaction failed");
}
switch(childpid_=fork()) {
case -1:
throw logic_error("cannot fork");
break;
case 0: {
dup2(open_pty_slave(p_stdin.second), 0);
dup2(open_pty_slave(p_stdout.second),1);
dup2(open_pty_slave(p_stderr.second),2);
execvp(argv[1],&(argv[1]));
}
default:
break;
}
fd_set rfds;
fd_set efds;
fcntl(0, F_SETFL, O_NONBLOCK);
fcntl(p_stdout.first, F_SETFL, O_NONBLOCK);
fcntl(p_stderr.first, F_SETFL, O_NONBLOCK);
int retcode=0;
char buffer[1024];
do {
FD_ZERO(&rfds);
FD_ZERO(&efds);
FD_SET(sig_chld_pipe[0],&rfds);
FD_SET(0, &rfds);
FD_SET(0, &efds);
FD_SET(p_stdout.first, &rfds);
FD_SET(p_stdout.first, &efds);
FD_SET(p_stderr.first, &rfds);
FD_SET(p_stderr.first, &efds);
int retval = select(max(sig_chld_pipe[0],
max(p_stdout.first,p_stderr.first))+1, &rfds, NULL, &efds, NULL);
if(FD_ISSET(sig_chld_pipe[0], &rfds)) {
read(sig_chld_pipe[0],buffer,1);
retcode=buffer[0];
break;
}
if(FD_ISSET(0,&rfds)) {
int length=read(0,buffer,1023);
if(length>0) {
// FIXME: strip identifier from input channel and remember it.
write(p_stdin.first,buffer,length);
}
}
if(FD_ISSET(p_stdout.first,&rfds)) {
int length=read(p_stdout.first,buffer,1023);
if(length>0) {
// FIXME: add identifier
write(1,buffer,length);
}
}
if(FD_ISSET(p_stderr.first,&rfds)) {
int length=read(p_stderr.first,buffer,1023);
if(length>0) {
// FIXME: add identifier
write(2,buffer,length);
}
}
} while(1==1);
if(retcode!=-1) {
int length=0;
while((length=read(p_stdout.first,buffer,1023))>0) {
// FIXME: add identifier
write(1,buffer,length);
}
while((length=read(p_stderr.first,buffer,1023))>0) {
// FIXME: add identifier
write(2,buffer,length);
}
}
exit(retcode);
}
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