small program showing erroneous behaviour of patched pppd

run-pppd-as-detached-child.c (text/plain), 1.25 KB, created by Alexander Ost on 2009-11-15 13:42:10 UTC

#include <stdio.h>
#include <unistd.h>

/*
 * Start pppd as a detached child process.
 *
 * This shows that option "updetach" together
 * with kill-pg.patch leads to immediate
 * modem hangup.
 */


char *myArgv[] = {
 "/usr/sbin/pppd",
 "debug",
 "kdebug",
 "255",
 /* the following option, in conjunction with 
  * pppd 2.4.4-r24 AND kill-pg.patch leads to pppd
  * reporting a "modem hangup" immediately
  * after PPP connection establishment.
  *
  * without kill-pg.patch, pppd does NOT
  * exit immediately and does NOT report a modem
  * hangup
  */
 "updetach",
 "idle",
 "7200",
 "dump",
 "noauth",
 "user",
 "foo",
 "password",
 "bar",
 "privgroup",
 "uucp",
 "/dev/ttyUSB2",
 "460800",
 "lock",
 "crtscts",
 "modem",
 "asyncmap",
 "0",
 "defaultroute",
 "usepeerdns",
 "noipx",
 "connect",
 "chat -v -f /home/arost/chatfile",
 NULL,
};

char *myEnv[] = { NULL };

main()
{
  int pid;

  if ( pid=fork() ) {
    /* parent: don't do much */
    printf( "parent: waiting for child completion...\n" );
    wait( pid );
    printf( "parent: child completed\n" );
    while ( 1 ) {
      printf( "parent: sleeping...\n" );
      sleep( 2 );

    }
  } else {
    /* child: exec pppd */
    printf( "child: exec'ing pppd\n" );
    execve(myArgv[0], myArgv, myEnv);
  }
}