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RETURN VALUES
Upon successful completion, rfork() returns a value of 0 to the child
process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, =
no
child process is created, and the global variable errno is set to
indicate the error.
I don't understand this wording:
> RFTHREAD If set, the new process shares file descriptor to process le=
aders table with its parent=20
Since `man -K 'process leader'` gives no result, I've read the FreeBSD sour=
ce
code and wrote about p_leader myself:
https://www.1a-insec.net/frag/35-freebsd-fd-race/. I hope I understand this
correctly.
For some reason, there are both `proc->p_fdtol->fdl_leader` and
`proc->p_leader`.
In sys/kern/kern_descrip.c, I see:
error =3D VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_S=
ETLK,
flp, flg);
(void) VOP_ADVLOCK(vp,
(caddr_t)fdtol->fdl_leader, F_UNLCK, &l=
f,
F_POSIX);
What is happening here?
--=20
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