Date: Thu, 8 Sep 2005 23:54:30 +0300 From: victor cruceru <victor.cruceru@gmail.com> To: erkan kolemen <erkankolemen@yahoo.com> Cc: freebsd-hackers@freebsd.org Subject: Re: fok() execve() -> No child processes Message-ID: <494025505090813545451dae6@mail.gmail.com> In-Reply-To: <20050908203521.84843.qmail@web33405.mail.mud.yahoo.com> References: <494025505090813027dc0d6d3@mail.gmail.com> <20050908203521.84843.qmail@web33405.mail.mud.yahoo.com>
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Well, I suppose that execve is successful. if not you should call
_exit() instead of exit() in the child process (you should not return
from e_x_e_c if the exec fails)
Also your application should not ignore SIGCHLD.
See man vfork and especially man wait.=20
victor cruceru
On 9/8/05, erkan kolemen <erkankolemen@yahoo.com> wrote:
> i tried and still same error.
>=20
> thanks.
>=20
> --- victor cruceru <victor.cruceru@gmail.com> wrote:
>=20
> > Try to replace vfrork with fork and check if you'll
> > get the same behavior.
> > victor cruceru
> >
> >
> > On 9/8/05, erkan kolemen <erkankolemen@yahoo.com>
> > wrote:
> > > Following code fails. I debugged it and saw that:
> > it
> > > produces "No child processes" error while wait().
> > >
> > > is it possible, parent still is not start to wait
> > but
> > > child finished. After that CPU schedules parents.
> > It
> > > try to start wait but child has finished.
> > >
> > > is it possible... What can i do for that?
> > >
> > > static int e_x_e_c(char *cmd[])
> > > {
> > > pid_t pid;
> > > int stat;
> > >
> > > switch((pid =3D vfork())) {
> > > case -1:
> > > syslog(LOG_ERR, "fork: %s",
> > > strerror(errno));
> > > return -16;
> > > break;
> > > case 0:
> > > if(execve(cmd[0], cmd,
> > NULL)
> > > =3D=3D -1) {
> > > syslog(LOG_ERR,
> > > "execve: %s", strerror(errno));
> > > return -15;
> > > }
> > > break;
> > > default:
> > > if (wait(&stat) =3D=3D -1) {
> > > slog(1, LOG_ERR);
> > > return -14;
> > > }
> > >
> > > if (WIFSIGNALED(stat)) {
> > > syslog(LOG_NOTICE,
> > "%s
> > > is signalled", cmdline[0]);
> > > return -13;
> > > }
> > >
> > > if (WIFSTOPPED(stat)) {
> > > syslog(LOG_NOTICE,
> > "%s
> > > is stopped", cmdline[0]);
> > > return -12;
> > > }
> > >
> > > if (WIFEXITED(stat))
> > > return
> > > WEXITSTATUS(stat);
> > > break;
> > > }
> > > return -11;
> > > }
> > >
> > >
> > >
> > >
> > >
> > >
> >
> ______________________________________________________
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>=20
>=20
>=20
>=20
>=20
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