Very Computer

>  Delon> I write a shell who must run under NetBSD, but I'm a fan of
>  Delon> Linux, so I'd like that it could run also under Linux.

>  Delon> So here is my problem :

>  Delon>           tcsetpgrp(open("/dev/tty", O_RDONLY), getpid())
>  Delon>      /* here is the mistake, the child die, the father
>  Delon> continue and he reveices a SIGTTOU under Linux (it works under
>  Delon> NetBSD), and it stops*/

> You need to block SIGTTOU around the call to tcsetpgrp. This is a
> misfeature of the POSIX standard (some dimwit decided that _all_
> terminal attribute changes should generate SIGTTOU from a background
> process, neglecting to consider the fact that this is the _normal_
> case for tcsetpgrp); some of the *BSDs don't conform strictly.

> --
> Andrew.

> comp.unix.programmer FAQ: see <URL: http://www.erlenstar.demon.co.uk/unix/>
>                            or <URL: http://www.whitefang.com/unix/>

> So here is my problem :

> actually i do the job control, i write few lines are efficient under
> netbsd
> but who doesn't work under linux.

> so here is my piece of my code with annotation :

> /*
> ** exec_cmd.c for  in
> **
> ** Made by nicolas delon

> **
> ** Started on  Fri Jan 21 12:31:06 2000 nicolas delon
> ## Last update Fri Apr 28 09:26:48 2000 nicolas delon
> */

> #include "my/my.h"
> #include "shell.h"
> #include <fcntl.h>
> #include <signal.h>

> void    exec_cmd(char *cmd[], int bg)
> {
>   int   pid;

>   signal(SIGCHLD, waiting);
>   if ((pid = fork()) == -1)
>     {
>       perror("mysh");
>       return;
>     }
>   else if (pid)
>     {
>       if (bg)
>         return;
>       else
>         {
>           setpgid(pid, pid);
>           tcsetpgrp(open("/dev/tty", O_RDONLY), pid)
>           pause();
>           tcsetpgrp(open("/dev/tty", O_RDONLY), getpid())       /* here
> is the mistake, the child die, the father continue
>                                                                    and
> he reveices a SIGTTOU
>                                                                    under
> Linux (it works under NetBSD), and it stops*/
>         }
>     }
>   else
>     {
>       usleep(1);
>       setpgid(getpid(), getpid());
>       if (!bg)
>         {
>           tcsetpgrp(open("/dev/tty", O_RDONLY), getpid())
>         }
>       cmd = redirections(cmd);
>       if (execvp(cmd[0], cmd) == -1)
>         {
>           aff_error("mysh: ");
>           aff_error(cmd[0]);
>           aff_error(": ");
>           aff_error("command not found\n");
>           exit(0);
>         }
>     }
> }

> so if anybody have a solution for this problem....