mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
Move linux_clone(), linux_fork(), linux_vfork() to a MI path.
This commit is contained in:
Dmitry Chagin
parent
c8d6845e9e
commit
222198ab0b
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=218616
@ -921,5 +921,6 @@ struct linux_robust_list_head {
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};
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int linux_set_upcall_kse(struct thread *td, register_t stack);
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int linux_set_cloned_tls(struct thread *td, void *desc);
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#endif /* !_AMD64_LINUX_H_ */
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@ -409,94 +409,6 @@ linux_old_select(struct thread *td, struct linux_old_select_args *args)
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}
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int
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linux_fork(struct thread *td, struct linux_fork_args *args)
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{
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int error;
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struct proc *p2;
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struct thread *td2;
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#ifdef DEBUG
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if (ldebug(fork))
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printf(ARGS(fork, ""));
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#endif
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if ((error = fork1(td, RFFDG | RFPROC | RFSTOPPED, 0, &p2)) != 0)
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return (error);
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if (error == 0) {
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td->td_retval[0] = p2->p_pid;
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td->td_retval[1] = 0;
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}
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if (td->td_retval[1] == 1)
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td->td_retval[0] = 0;
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error = linux_proc_init(td, td->td_retval[0], 0);
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if (error)
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return (error);
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td2 = FIRST_THREAD_IN_PROC(p2);
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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return (0);
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}
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int
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linux_vfork(struct thread *td, struct linux_vfork_args *args)
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{
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int error;
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struct proc *p2;
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struct thread *td2;
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#ifdef DEBUG
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if (ldebug(vfork))
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printf(ARGS(vfork, ""));
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#endif
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/* Exclude RFPPWAIT */
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if ((error = fork1(td, RFFDG | RFPROC | RFMEM | RFSTOPPED, 0, &p2)) != 0)
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return (error);
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if (error == 0) {
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td->td_retval[0] = p2->p_pid;
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td->td_retval[1] = 0;
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}
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/* Are we the child? */
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if (td->td_retval[1] == 1)
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td->td_retval[0] = 0;
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error = linux_proc_init(td, td->td_retval[0], 0);
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if (error)
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return (error);
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PROC_LOCK(p2);
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p2->p_flag |= P_PPWAIT;
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PROC_UNLOCK(p2);
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td2 = FIRST_THREAD_IN_PROC(p2);
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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/* wait for the children to exit, ie. emulate vfork */
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PROC_LOCK(p2);
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while (p2->p_flag & P_PPWAIT)
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cv_wait(&p2->p_pwait, &p2->p_mtx);
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PROC_UNLOCK(p2);
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return (0);
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}
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static int
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linux_set_cloned_tls(struct thread *td, void *desc)
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{
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struct user_segment_descriptor sd;
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@ -540,160 +452,6 @@ linux_set_cloned_tls(struct thread *td, void *desc)
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return (error);
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}
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int
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linux_clone(struct thread *td, struct linux_clone_args *args)
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{
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int error, ff = RFPROC | RFSTOPPED;
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struct proc *p2;
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struct thread *td2;
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int exit_signal;
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struct linux_emuldata *em;
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#ifdef DEBUG
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if (ldebug(clone)) {
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printf(ARGS(clone, "flags %x, stack %p, parent tid: %p, "
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"child tid: %p"), (unsigned)args->flags,
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args->stack, args->parent_tidptr, args->child_tidptr);
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}
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#endif
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exit_signal = args->flags & 0x000000ff;
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if (LINUX_SIG_VALID(exit_signal)) {
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if (exit_signal <= LINUX_SIGTBLSZ)
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exit_signal =
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linux_to_bsd_signal[_SIG_IDX(exit_signal)];
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} else if (exit_signal != 0)
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return (EINVAL);
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if (args->flags & LINUX_CLONE_VM)
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ff |= RFMEM;
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if (args->flags & LINUX_CLONE_SIGHAND)
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ff |= RFSIGSHARE;
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/*
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* XXX: In Linux, sharing of fs info (chroot/cwd/umask)
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* and open files is independant. In FreeBSD, its in one
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* structure but in reality it does not cause any problems
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* because both of these flags are usually set together.
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*/
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if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
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ff |= RFFDG;
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/*
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* Attempt to detect when linux_clone(2) is used for creating
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* kernel threads. Unfortunately despite the existence of the
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* CLONE_THREAD flag, version of linuxthreads package used in
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* most popular distros as of beginning of 2005 doesn't make
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* any use of it. Therefore, this detection relies on
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* empirical observation that linuxthreads sets certain
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* combination of flags, so that we can make more or less
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* precise detection and notify the FreeBSD kernel that several
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* processes are in fact part of the same threading group, so
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* that special treatment is necessary for signal delivery
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* between those processes and fd locking.
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*/
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if ((args->flags & 0xffffff00) == LINUX_THREADING_FLAGS)
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ff |= RFTHREAD;
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if (args->flags & LINUX_CLONE_PARENT_SETTID)
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if (args->parent_tidptr == NULL)
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return (EINVAL);
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error = fork1(td, ff, 0, &p2);
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if (error)
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return (error);
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if (args->flags & (LINUX_CLONE_PARENT | LINUX_CLONE_THREAD)) {
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sx_xlock(&proctree_lock);
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PROC_LOCK(p2);
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proc_reparent(p2, td->td_proc->p_pptr);
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PROC_UNLOCK(p2);
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sx_xunlock(&proctree_lock);
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}
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/* create the emuldata */
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error = linux_proc_init(td, p2->p_pid, args->flags);
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/* reference it - no need to check this */
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em = em_find(p2, EMUL_DOLOCK);
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KASSERT(em != NULL, ("clone: emuldata not found.\n"));
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/* and adjust it */
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if (args->flags & LINUX_CLONE_THREAD) {
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#ifdef notyet
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PROC_LOCK(p2);
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p2->p_pgrp = td->td_proc->p_pgrp;
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PROC_UNLOCK(p2);
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#endif
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exit_signal = 0;
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}
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if (args->flags & LINUX_CLONE_CHILD_SETTID)
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em->child_set_tid = args->child_tidptr;
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else
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em->child_set_tid = NULL;
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if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
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em->child_clear_tid = args->child_tidptr;
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else
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em->child_clear_tid = NULL;
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EMUL_UNLOCK(&emul_lock);
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if (args->flags & LINUX_CLONE_PARENT_SETTID) {
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error = copyout(&p2->p_pid, args->parent_tidptr,
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sizeof(p2->p_pid));
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if (error)
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printf(LMSG("copyout failed!"));
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}
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PROC_LOCK(p2);
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p2->p_sigparent = exit_signal;
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PROC_UNLOCK(p2);
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td2 = FIRST_THREAD_IN_PROC(p2);
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/*
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* In a case of stack = NULL, we are supposed to COW calling process
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* stack. This is what normal fork() does, so we just keep tf_rsp arg
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* intact.
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*/
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if (args->stack)
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linux_set_upcall_kse(td2, PTROUT(args->stack));
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if (args->flags & LINUX_CLONE_SETTLS)
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linux_set_cloned_tls(td2, args->tls);
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#ifdef DEBUG
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if (ldebug(clone))
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printf(LMSG("clone: successful rfork to %d, "
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"stack %p sig = %d"), (int)p2->p_pid, args->stack,
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exit_signal);
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#endif
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if (args->flags & LINUX_CLONE_VFORK) {
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PROC_LOCK(p2);
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p2->p_flag |= P_PPWAIT;
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PROC_UNLOCK(p2);
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}
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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td->td_retval[0] = p2->p_pid;
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td->td_retval[1] = 0;
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if (args->flags & LINUX_CLONE_VFORK) {
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/* wait for the children to exit, ie. emulate vfork */
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PROC_LOCK(p2);
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while (p2->p_flag & P_PPWAIT)
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cv_wait(&p2->p_pwait, &p2->p_mtx);
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PROC_UNLOCK(p2);
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}
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return (0);
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}
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int
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linux_set_upcall_kse(struct thread *td, register_t stack)
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{
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297
sys/compat/linux/linux_fork.c
Normal file
297
sys/compat/linux/linux_fork.c
Normal file
@ -0,0 +1,297 @@
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/*-
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* Copyright (c) 2004 Tim J. Robbins
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* Copyright (c) 2002 Doug Rabson
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* Copyright (c) 2000 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/imgact.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sched.h>
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#include <sys/sx.h>
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#include <sys/unistd.h>
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#include <machine/frame.h>
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#ifdef COMPAT_LINUX32
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#include <machine/../linux32/linux.h>
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#include <machine/../linux32/linux32_proto.h>
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#else
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#include <machine/../linux/linux.h>
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#include <machine/../linux/linux_proto.h>
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#endif
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#include <compat/linux/linux_signal.h>
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#include <compat/linux/linux_emul.h>
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int
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linux_fork(struct thread *td, struct linux_fork_args *args)
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{
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int error;
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struct proc *p2;
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struct thread *td2;
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#ifdef DEBUG
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if (ldebug(fork))
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printf(ARGS(fork, ""));
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#endif
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if ((error = fork1(td, RFFDG | RFPROC | RFSTOPPED, 0, &p2)) != 0)
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return (error);
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if (error == 0) {
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td->td_retval[0] = p2->p_pid;
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td->td_retval[1] = 0;
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}
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if (td->td_retval[1] == 1)
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td->td_retval[0] = 0;
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error = linux_proc_init(td, td->td_retval[0], 0);
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if (error)
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return (error);
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td2 = FIRST_THREAD_IN_PROC(p2);
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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return (0);
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}
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int
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linux_vfork(struct thread *td, struct linux_vfork_args *args)
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{
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int error;
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struct proc *p2;
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struct thread *td2;
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#ifdef DEBUG
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if (ldebug(vfork))
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printf(ARGS(vfork, ""));
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#endif
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/* Exclude RFPPWAIT */
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if ((error = fork1(td, RFFDG | RFPROC | RFMEM | RFSTOPPED, 0, &p2)) != 0)
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return (error);
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if (error == 0) {
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td->td_retval[0] = p2->p_pid;
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td->td_retval[1] = 0;
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}
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/* Are we the child? */
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if (td->td_retval[1] == 1)
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td->td_retval[0] = 0;
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error = linux_proc_init(td, td->td_retval[0], 0);
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if (error)
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return (error);
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PROC_LOCK(p2);
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p2->p_flag |= P_PPWAIT;
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PROC_UNLOCK(p2);
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td2 = FIRST_THREAD_IN_PROC(p2);
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/*
|
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* Make this runnable after we are finished with it.
|
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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|
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/* wait for the children to exit, ie. emulate vfork */
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PROC_LOCK(p2);
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while (p2->p_flag & P_PPWAIT)
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cv_wait(&p2->p_pwait, &p2->p_mtx);
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PROC_UNLOCK(p2);
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return (0);
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}
|
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int
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linux_clone(struct thread *td, struct linux_clone_args *args)
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{
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int error, ff = RFPROC | RFSTOPPED;
|
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struct proc *p2;
|
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struct thread *td2;
|
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int exit_signal;
|
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struct linux_emuldata *em;
|
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|
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#ifdef DEBUG
|
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if (ldebug(clone)) {
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printf(ARGS(clone, "flags %x, stack %p, parent tid: %p, "
|
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"child tid: %p"), (unsigned)args->flags,
|
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args->stack, args->parent_tidptr, args->child_tidptr);
|
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}
|
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#endif
|
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exit_signal = args->flags & 0x000000ff;
|
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if (LINUX_SIG_VALID(exit_signal)) {
|
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if (exit_signal <= LINUX_SIGTBLSZ)
|
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exit_signal =
|
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linux_to_bsd_signal[_SIG_IDX(exit_signal)];
|
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} else if (exit_signal != 0)
|
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return (EINVAL);
|
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|
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if (args->flags & LINUX_CLONE_VM)
|
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ff |= RFMEM;
|
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if (args->flags & LINUX_CLONE_SIGHAND)
|
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ff |= RFSIGSHARE;
|
||||
/*
|
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* XXX: In Linux, sharing of fs info (chroot/cwd/umask)
|
||||
* and open files is independant. In FreeBSD, its in one
|
||||
* structure but in reality it does not cause any problems
|
||||
* because both of these flags are usually set together.
|
||||
*/
|
||||
if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
|
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ff |= RFFDG;
|
||||
|
||||
/*
|
||||
* Attempt to detect when linux_clone(2) is used for creating
|
||||
* kernel threads. Unfortunately despite the existence of the
|
||||
* CLONE_THREAD flag, version of linuxthreads package used in
|
||||
* most popular distros as of beginning of 2005 doesn't make
|
||||
* any use of it. Therefore, this detection relies on
|
||||
* empirical observation that linuxthreads sets certain
|
||||
* combination of flags, so that we can make more or less
|
||||
* precise detection and notify the FreeBSD kernel that several
|
||||
* processes are in fact part of the same threading group, so
|
||||
* that special treatment is necessary for signal delivery
|
||||
* between those processes and fd locking.
|
||||
*/
|
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if ((args->flags & 0xffffff00) == LINUX_THREADING_FLAGS)
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ff |= RFTHREAD;
|
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|
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if (args->flags & LINUX_CLONE_PARENT_SETTID)
|
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if (args->parent_tidptr == NULL)
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return (EINVAL);
|
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|
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error = fork1(td, ff, 0, &p2);
|
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if (error)
|
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return (error);
|
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|
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if (args->flags & (LINUX_CLONE_PARENT | LINUX_CLONE_THREAD)) {
|
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sx_xlock(&proctree_lock);
|
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PROC_LOCK(p2);
|
||||
proc_reparent(p2, td->td_proc->p_pptr);
|
||||
PROC_UNLOCK(p2);
|
||||
sx_xunlock(&proctree_lock);
|
||||
}
|
||||
|
||||
/* create the emuldata */
|
||||
error = linux_proc_init(td, p2->p_pid, args->flags);
|
||||
/* reference it - no need to check this */
|
||||
em = em_find(p2, EMUL_DOLOCK);
|
||||
KASSERT(em != NULL, ("clone: emuldata not found."));
|
||||
/* and adjust it */
|
||||
|
||||
if (args->flags & LINUX_CLONE_THREAD) {
|
||||
#ifdef notyet
|
||||
PROC_LOCK(p2);
|
||||
p2->p_pgrp = td->td_proc->p_pgrp;
|
||||
PROC_UNLOCK(p2);
|
||||
#endif
|
||||
exit_signal = 0;
|
||||
}
|
||||
|
||||
if (args->flags & LINUX_CLONE_CHILD_SETTID)
|
||||
em->child_set_tid = args->child_tidptr;
|
||||
else
|
||||
em->child_set_tid = NULL;
|
||||
|
||||
if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
|
||||
em->child_clear_tid = args->child_tidptr;
|
||||
else
|
||||
em->child_clear_tid = NULL;
|
||||
|
||||
EMUL_UNLOCK(&emul_lock);
|
||||
|
||||
if (args->flags & LINUX_CLONE_PARENT_SETTID) {
|
||||
error = copyout(&p2->p_pid, args->parent_tidptr,
|
||||
sizeof(p2->p_pid));
|
||||
if (error)
|
||||
printf(LMSG("copyout failed!"));
|
||||
}
|
||||
|
||||
PROC_LOCK(p2);
|
||||
p2->p_sigparent = exit_signal;
|
||||
PROC_UNLOCK(p2);
|
||||
td2 = FIRST_THREAD_IN_PROC(p2);
|
||||
/*
|
||||
* In a case of stack = NULL, we are supposed to COW calling process
|
||||
* stack. This is what normal fork() does, so we just keep tf_rsp arg
|
||||
* intact.
|
||||
*/
|
||||
if (args->stack)
|
||||
linux_set_upcall_kse(td2, PTROUT(args->stack));
|
||||
|
||||
if (args->flags & LINUX_CLONE_SETTLS)
|
||||
linux_set_cloned_tls(td2, args->tls);
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ldebug(clone))
|
||||
printf(LMSG("clone: successful rfork to %d, "
|
||||
"stack %p sig = %d"), (int)p2->p_pid, args->stack,
|
||||
exit_signal);
|
||||
#endif
|
||||
if (args->flags & LINUX_CLONE_VFORK) {
|
||||
PROC_LOCK(p2);
|
||||
p2->p_flag |= P_PPWAIT;
|
||||
PROC_UNLOCK(p2);
|
||||
}
|
||||
|
||||
/*
|
||||
* Make this runnable after we are finished with it.
|
||||
*/
|
||||
thread_lock(td2);
|
||||
TD_SET_CAN_RUN(td2);
|
||||
sched_add(td2, SRQ_BORING);
|
||||
thread_unlock(td2);
|
||||
|
||||
td->td_retval[0] = p2->p_pid;
|
||||
td->td_retval[1] = 0;
|
||||
|
||||
if (args->flags & LINUX_CLONE_VFORK) {
|
||||
/* wait for the children to exit, ie. emulate vfork */
|
||||
PROC_LOCK(p2);
|
||||
while (p2->p_flag & P_PPWAIT)
|
||||
cv_wait(&p2->p_pwait, &p2->p_mtx);
|
||||
PROC_UNLOCK(p2);
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
@ -259,6 +259,7 @@ amd64/linux32/linux32_sysent.c optional compat_linux32
|
||||
amd64/linux32/linux32_sysvec.c optional compat_linux32
|
||||
compat/linux/linux_emul.c optional compat_linux32
|
||||
compat/linux/linux_file.c optional compat_linux32
|
||||
compat/linux/linux_fork.c optional compat_linux32
|
||||
compat/linux/linux_futex.c optional compat_linux32
|
||||
compat/linux/linux_getcwd.c optional compat_linux32
|
||||
compat/linux/linux_ioctl.c optional compat_linux32
|
||||
|
||||
@ -71,6 +71,7 @@ compat/linprocfs/linprocfs.c optional linprocfs
|
||||
compat/linsysfs/linsysfs.c optional linsysfs
|
||||
compat/linux/linux_emul.c optional compat_linux
|
||||
compat/linux/linux_file.c optional compat_linux
|
||||
compat/linux/linux_fork.c optional compat_linux
|
||||
compat/linux/linux_futex.c optional compat_linux
|
||||
compat/linux/linux_getcwd.c optional compat_linux
|
||||
compat/linux/linux_ioctl.c optional compat_linux
|
||||
|
||||
@ -42,6 +42,7 @@ compat/linprocfs/linprocfs.c optional linprocfs
|
||||
compat/linsysfs/linsysfs.c optional linsysfs
|
||||
compat/linux/linux_emul.c optional compat_linux
|
||||
compat/linux/linux_file.c optional compat_linux
|
||||
compat/linux/linux_fork.c optional compat_linux
|
||||
compat/linux/linux_futex.c optional compat_linux
|
||||
compat/linux/linux_getcwd.c optional compat_linux
|
||||
compat/linux/linux_ioctl.c optional compat_linux
|
||||
|
||||
@ -881,5 +881,6 @@ struct linux_robust_list_head {
|
||||
};
|
||||
|
||||
int linux_set_upcall_kse(struct thread *td, register_t stack);
|
||||
int linux_set_cloned_tls(struct thread *td, void *desc);
|
||||
|
||||
#endif /* !_I386_LINUX_H_ */
|
||||
|
||||
@ -300,94 +300,6 @@ linux_old_select(struct thread *td, struct linux_old_select_args *args)
|
||||
}
|
||||
|
||||
int
|
||||
linux_fork(struct thread *td, struct linux_fork_args *args)
|
||||
{
|
||||
int error;
|
||||
struct proc *p2;
|
||||
struct thread *td2;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ldebug(fork))
|
||||
printf(ARGS(fork, ""));
|
||||
#endif
|
||||
|
||||
if ((error = fork1(td, RFFDG | RFPROC | RFSTOPPED, 0, &p2)) != 0)
|
||||
return (error);
|
||||
|
||||
if (error == 0) {
|
||||
td->td_retval[0] = p2->p_pid;
|
||||
td->td_retval[1] = 0;
|
||||
}
|
||||
|
||||
if (td->td_retval[1] == 1)
|
||||
td->td_retval[0] = 0;
|
||||
error = linux_proc_init(td, td->td_retval[0], 0);
|
||||
if (error)
|
||||
return (error);
|
||||
|
||||
td2 = FIRST_THREAD_IN_PROC(p2);
|
||||
|
||||
/*
|
||||
* Make this runnable after we are finished with it.
|
||||
*/
|
||||
thread_lock(td2);
|
||||
TD_SET_CAN_RUN(td2);
|
||||
sched_add(td2, SRQ_BORING);
|
||||
thread_unlock(td2);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
linux_vfork(struct thread *td, struct linux_vfork_args *args)
|
||||
{
|
||||
int error;
|
||||
struct proc *p2;
|
||||
struct thread *td2;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ldebug(vfork))
|
||||
printf(ARGS(vfork, ""));
|
||||
#endif
|
||||
|
||||
/* exclude RFPPWAIT */
|
||||
if ((error = fork1(td, RFFDG | RFPROC | RFMEM | RFSTOPPED, 0, &p2)) != 0)
|
||||
return (error);
|
||||
if (error == 0) {
|
||||
td->td_retval[0] = p2->p_pid;
|
||||
td->td_retval[1] = 0;
|
||||
}
|
||||
/* Are we the child? */
|
||||
if (td->td_retval[1] == 1)
|
||||
td->td_retval[0] = 0;
|
||||
error = linux_proc_init(td, td->td_retval[0], 0);
|
||||
if (error)
|
||||
return (error);
|
||||
|
||||
PROC_LOCK(p2);
|
||||
p2->p_flag |= P_PPWAIT;
|
||||
PROC_UNLOCK(p2);
|
||||
|
||||
td2 = FIRST_THREAD_IN_PROC(p2);
|
||||
|
||||
/*
|
||||
* Make this runnable after we are finished with it.
|
||||
*/
|
||||
thread_lock(td2);
|
||||
TD_SET_CAN_RUN(td2);
|
||||
sched_add(td2, SRQ_BORING);
|
||||
thread_unlock(td2);
|
||||
|
||||
/* wait for the children to exit, ie. emulate vfork */
|
||||
PROC_LOCK(p2);
|
||||
while (p2->p_flag & P_PPWAIT)
|
||||
cv_wait(&p2->p_pwait, &p2->p_mtx);
|
||||
PROC_UNLOCK(p2);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
linux_set_cloned_tls(struct thread *td, void *desc)
|
||||
{
|
||||
struct segment_descriptor sd;
|
||||
@ -443,160 +355,6 @@ linux_set_cloned_tls(struct thread *td, void *desc)
|
||||
return (error);
|
||||
}
|
||||
|
||||
int
|
||||
linux_clone(struct thread *td, struct linux_clone_args *args)
|
||||
{
|
||||
int error, ff = RFPROC | RFSTOPPED;
|
||||
struct proc *p2;
|
||||
struct thread *td2;
|
||||
int exit_signal;
|
||||
struct linux_emuldata *em;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ldebug(clone)) {
|
||||
printf(ARGS(clone, "flags %x, stack %x, parent tid: %x, child tid: %x"),
|
||||
(unsigned int)args->flags, (unsigned int)args->stack,
|
||||
(unsigned int)args->parent_tidptr, (unsigned int)args->child_tidptr);
|
||||
}
|
||||
#endif
|
||||
|
||||
exit_signal = args->flags & 0x000000ff;
|
||||
if (LINUX_SIG_VALID(exit_signal)) {
|
||||
if (exit_signal <= LINUX_SIGTBLSZ)
|
||||
exit_signal =
|
||||
linux_to_bsd_signal[_SIG_IDX(exit_signal)];
|
||||
} else if (exit_signal != 0)
|
||||
return (EINVAL);
|
||||
|
||||
if (args->flags & LINUX_CLONE_VM)
|
||||
ff |= RFMEM;
|
||||
if (args->flags & LINUX_CLONE_SIGHAND)
|
||||
ff |= RFSIGSHARE;
|
||||
/*
|
||||
* XXX: in linux sharing of fs info (chroot/cwd/umask)
|
||||
* and open files is independant. in fbsd its in one
|
||||
* structure but in reality it doesn't cause any problems
|
||||
* because both of these flags are usually set together.
|
||||
*/
|
||||
if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
|
||||
ff |= RFFDG;
|
||||
|
||||
/*
|
||||
* Attempt to detect when linux_clone(2) is used for creating
|
||||
* kernel threads. Unfortunately despite the existence of the
|
||||
* CLONE_THREAD flag, version of linuxthreads package used in
|
||||
* most popular distros as of beginning of 2005 doesn't make
|
||||
* any use of it. Therefore, this detection relies on
|
||||
* empirical observation that linuxthreads sets certain
|
||||
* combination of flags, so that we can make more or less
|
||||
* precise detection and notify the FreeBSD kernel that several
|
||||
* processes are in fact part of the same threading group, so
|
||||
* that special treatment is necessary for signal delivery
|
||||
* between those processes and fd locking.
|
||||
*/
|
||||
if ((args->flags & 0xffffff00) == LINUX_THREADING_FLAGS)
|
||||
ff |= RFTHREAD;
|
||||
|
||||
if (args->flags & LINUX_CLONE_PARENT_SETTID)
|
||||
if (args->parent_tidptr == NULL)
|
||||
return (EINVAL);
|
||||
|
||||
error = fork1(td, ff, 0, &p2);
|
||||
if (error)
|
||||
return (error);
|
||||
|
||||
if (args->flags & (LINUX_CLONE_PARENT | LINUX_CLONE_THREAD)) {
|
||||
sx_xlock(&proctree_lock);
|
||||
PROC_LOCK(p2);
|
||||
proc_reparent(p2, td->td_proc->p_pptr);
|
||||
PROC_UNLOCK(p2);
|
||||
sx_xunlock(&proctree_lock);
|
||||
}
|
||||
|
||||
/* create the emuldata */
|
||||
error = linux_proc_init(td, p2->p_pid, args->flags);
|
||||
/* reference it - no need to check this */
|
||||
em = em_find(p2, EMUL_DOLOCK);
|
||||
KASSERT(em != NULL, ("clone: emuldata not found.\n"));
|
||||
/* and adjust it */
|
||||
|
||||
if (args->flags & LINUX_CLONE_THREAD) {
|
||||
/* XXX: linux mangles pgrp and pptr somehow
|
||||
* I think it might be this but I am not sure.
|
||||
*/
|
||||
#ifdef notyet
|
||||
PROC_LOCK(p2);
|
||||
p2->p_pgrp = td->td_proc->p_pgrp;
|
||||
PROC_UNLOCK(p2);
|
||||
#endif
|
||||
exit_signal = 0;
|
||||
}
|
||||
|
||||
if (args->flags & LINUX_CLONE_CHILD_SETTID)
|
||||
em->child_set_tid = args->child_tidptr;
|
||||
else
|
||||
em->child_set_tid = NULL;
|
||||
|
||||
if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
|
||||
em->child_clear_tid = args->child_tidptr;
|
||||
else
|
||||
em->child_clear_tid = NULL;
|
||||
|
||||
EMUL_UNLOCK(&emul_lock);
|
||||
|
||||
if (args->flags & LINUX_CLONE_PARENT_SETTID) {
|
||||
error = copyout(&p2->p_pid, args->parent_tidptr, sizeof(p2->p_pid));
|
||||
if (error)
|
||||
printf(LMSG("copyout failed!"));
|
||||
}
|
||||
|
||||
PROC_LOCK(p2);
|
||||
p2->p_sigparent = exit_signal;
|
||||
PROC_UNLOCK(p2);
|
||||
td2 = FIRST_THREAD_IN_PROC(p2);
|
||||
/*
|
||||
* in a case of stack = NULL we are supposed to COW calling process stack
|
||||
* this is what normal fork() does so we just keep the tf_esp arg intact
|
||||
*/
|
||||
if (args->stack)
|
||||
linux_set_upcall_kse(td2, PTROUT(args->stack));
|
||||
|
||||
if (args->flags & LINUX_CLONE_SETTLS)
|
||||
linux_set_cloned_tls(td2, args->tls);
|
||||
|
||||
#ifdef DEBUG
|
||||
if (ldebug(clone))
|
||||
printf(LMSG("clone: successful rfork to %ld, stack %p sig = %d"),
|
||||
(long)p2->p_pid, args->stack, exit_signal);
|
||||
#endif
|
||||
if (args->flags & LINUX_CLONE_VFORK) {
|
||||
PROC_LOCK(p2);
|
||||
p2->p_flag |= P_PPWAIT;
|
||||
PROC_UNLOCK(p2);
|
||||
}
|
||||
|
||||
/*
|
||||
* Make this runnable after we are finished with it.
|
||||
*/
|
||||
thread_lock(td2);
|
||||
TD_SET_CAN_RUN(td2);
|
||||
sched_add(td2, SRQ_BORING);
|
||||
thread_unlock(td2);
|
||||
|
||||
td->td_retval[0] = p2->p_pid;
|
||||
td->td_retval[1] = 0;
|
||||
|
||||
if (args->flags & LINUX_CLONE_VFORK) {
|
||||
/* wait for the children to exit, ie. emulate vfork */
|
||||
PROC_LOCK(p2);
|
||||
while (p2->p_flag & P_PPWAIT)
|
||||
cv_wait(&p2->p_pwait, &p2->p_mtx);
|
||||
PROC_UNLOCK(p2);
|
||||
}
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
linux_set_upcall_kse(struct thread *td, register_t stack)
|
||||
{
|
||||
|
||||
@ -8,7 +8,7 @@ CFLAGS+=-DCOMPAT_FREEBSD32 -DCOMPAT_LINUX32
|
||||
.PATH: ${.CURDIR}/../../compat/linux ${.CURDIR}/../../${MACHINE_CPUARCH}/linux${SFX}
|
||||
|
||||
KMOD= linux
|
||||
SRCS= linux${SFX}_dummy.c linux_emul.c linux_file.c \
|
||||
SRCS= linux_fork.c linux${SFX}_dummy.c linux_emul.c linux_file.c \
|
||||
linux_futex.c linux_getcwd.c linux_ioctl.c linux_ipc.c \
|
||||
linux${SFX}_machdep.c linux_mib.c linux_misc.c linux_signal.c \
|
||||
linux_socket.c linux_stats.c linux_sysctl.c linux${SFX}_sysent.c \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user