void linux_proc_init(struct thread *td, struct thread *newtd, int flags) { struct linux_emuldata *em; struct linux_pemuldata *pem; struct epoll_emuldata *emd; struct proc *p; if (newtd != NULL) { p = newtd->td_proc; /* non-exec call */ em = malloc(sizeof(*em), M_TEMP, M_WAITOK | M_ZERO); if (flags & LINUX_CLONE_THREAD) { LINUX_CTR1(proc_init, "thread newtd(%d)", newtd->td_tid); em->em_tid = newtd->td_tid; } else { LINUX_CTR1(proc_init, "fork newtd(%d)", p->p_pid); em->em_tid = p->p_pid; pem = malloc(sizeof(*pem), M_LINUX, M_WAITOK | M_ZERO); sx_init(&pem->pem_sx, "lpemlk"); p->p_emuldata = pem; } newtd->td_emuldata = em; } else { p = td->td_proc; /* exec */ LINUX_CTR1(proc_init, "exec newtd(%d)", p->p_pid); /* lookup the old one */ em = em_find(td); KASSERT(em != NULL, ("proc_init: emuldata not found in exec case.\n")); em->em_tid = p->p_pid; em->flags = 0; em->pdeath_signal = 0; em->robust_futexes = NULL; em->child_clear_tid = NULL; em->child_set_tid = NULL; /* epoll should be destroyed in a case of exec. */ pem = pem_find(p); KASSERT(pem != NULL, ("proc_exit: proc emuldata not found.\n")); if (pem->epoll != NULL) { emd = pem->epoll; pem->epoll = NULL; free(emd, M_EPOLL); } } }
int linux_set_tid_address(struct thread *td, struct linux_set_tid_address_args *args) { struct linux_emuldata *em; em = em_find(td); KASSERT(em != NULL, ("set_tid_address: emuldata not found.\n")); em->child_clear_tid = args->tidptr; td->td_retval[0] = em->em_tid; LINUX_CTR3(set_tid_address, "tidptr(%d) %p, returns %d", em->em_tid, args->tidptr, td->td_retval[0]); return (0); }
int linux_exit(struct thread *td, struct linux_exit_args *args) { struct linux_emuldata *em; em = em_find(td); KASSERT(em != NULL, ("exit: emuldata not found.\n")); LINUX_CTR2(exit, "thread(%d) (%d)", em->em_tid, args->rval); linux_thread_detach(td); /* * XXX. When the last two threads of a process * exit via pthread_exit() try thr_exit() first. */ kern_thr_exit(td); exit1(td, W_EXITCODE(args->rval, 0)); /* NOTREACHED */ }
void linux_thread_detach(struct thread *td) { struct linux_sys_futex_args cup; struct linux_emuldata *em; int *child_clear_tid; int error; em = em_find(td); KASSERT(em != NULL, ("thread_detach: emuldata not found.\n")); LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid); release_futexes(td, em); child_clear_tid = em->child_clear_tid; if (child_clear_tid != NULL) { LINUX_CTR2(thread_detach, "thread(%d) %p", em->em_tid, child_clear_tid); error = suword32(child_clear_tid, 0); if (error != 0) return; cup.uaddr = child_clear_tid; cup.op = LINUX_FUTEX_WAKE; cup.val = 1; /* wake one */ cup.timeout = NULL; cup.uaddr2 = NULL; cup.val3 = 0; error = linux_sys_futex(td, &cup); /* * this cannot happen at the moment and if this happens it * probably means there is a user space bug */ if (error != 0) linux_msg(td, "futex stuff in thread_detach failed."); } }
static int linux_clone_thread(struct thread *td, struct linux_clone_args *args) { struct linux_emuldata *em; struct thread *newtd; struct proc *p; int error; #ifdef DEBUG if (ldebug(clone)) { printf(ARGS(clone, "thread: flags %x, stack %p, parent tid: %p, " "child tid: %p"), (unsigned)args->flags, args->stack, args->parent_tidptr, args->child_tidptr); } #endif LINUX_CTR4(clone_thread, "thread(%d) flags %x ptid %p ctid %p", td->td_tid, (unsigned)args->flags, args->parent_tidptr, args->child_tidptr); if (args->flags & LINUX_CLONE_PARENT_SETTID) if (args->parent_tidptr == NULL) return (EINVAL); /* Threads should be created with own stack */ if (args->stack == NULL) return (EINVAL); p = td->td_proc; #ifdef RACCT if (racct_enable) { PROC_LOCK(p); error = racct_add(p, RACCT_NTHR, 1); PROC_UNLOCK(p); if (error != 0) return (EPROCLIM); } #endif /* Initialize our td */ error = kern_thr_alloc(p, 0, &newtd); if (error) goto fail; cpu_copy_thread(newtd, td); bzero(&newtd->td_startzero, __rangeof(struct thread, td_startzero, td_endzero)); bcopy(&td->td_startcopy, &newtd->td_startcopy, __rangeof(struct thread, td_startcopy, td_endcopy)); newtd->td_proc = p; thread_cow_get(newtd, td); /* create the emuldata */ linux_proc_init(td, newtd, args->flags); em = em_find(newtd); KASSERT(em != NULL, ("clone_thread: emuldata not found.\n")); if (args->flags & LINUX_CLONE_SETTLS) linux_set_cloned_tls(newtd, args->tls); 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; cpu_thread_clean(newtd); linux_set_upcall_kse(newtd, PTROUT(args->stack)); PROC_LOCK(p); p->p_flag |= P_HADTHREADS; bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name)); if (args->flags & LINUX_CLONE_PARENT) thread_link(newtd, p->p_pptr); else thread_link(newtd, p); thread_lock(td); /* let the scheduler know about these things. */ sched_fork_thread(td, newtd); thread_unlock(td); if (P_SHOULDSTOP(p)) newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK; PROC_UNLOCK(p); tidhash_add(newtd); #ifdef DEBUG if (ldebug(clone)) printf(ARGS(clone, "successful clone to %d, stack %p"), (int)newtd->td_tid, args->stack); #endif LINUX_CTR2(clone_thread, "thread(%d) successful clone to %d", td->td_tid, newtd->td_tid); if (args->flags & LINUX_CLONE_PARENT_SETTID) { error = copyout(&newtd->td_tid, args->parent_tidptr, sizeof(newtd->td_tid)); if (error) printf(LMSG("clone_thread: copyout failed!")); } /* * Make this runnable after we are finished with it. */ thread_lock(newtd); TD_SET_CAN_RUN(newtd); sched_add(newtd, SRQ_BORING); thread_unlock(newtd); td->td_retval[0] = newtd->td_tid; return (0); fail: #ifdef RACCT if (racct_enable) { PROC_LOCK(p); racct_sub(p, RACCT_NTHR, 1); PROC_UNLOCK(p); } #endif return (error); }
static int linux_clone_proc(struct thread *td, struct linux_clone_args *args) { struct fork_req fr; 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 %p, parent tid: %p, " "child tid: %p"), (unsigned)args->flags, args->stack, args->parent_tidptr, args->child_tidptr); } #endif exit_signal = args->flags & 0x000000ff; if (LINUX_SIG_VALID(exit_signal)) { exit_signal = linux_to_bsd_signal(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 independent. 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))) ff |= RFFDG; if (args->flags & LINUX_CLONE_PARENT_SETTID) if (args->parent_tidptr == NULL) return (EINVAL); if (args->flags & LINUX_CLONE_VFORK) ff |= RFPPWAIT; bzero(&fr, sizeof(fr)); fr.fr_flags = ff; fr.fr_procp = &p2; error = fork1(td, &fr); if (error) return (error); td2 = FIRST_THREAD_IN_PROC(p2); /* create the emuldata */ linux_proc_init(td, td2, args->flags); em = em_find(td2); KASSERT(em != NULL, ("clone_proc: emuldata not found.\n")); 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; 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); /* * 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. */ linux_set_upcall_kse(td2, PTROUT(args->stack)); if (args->flags & LINUX_CLONE_SETTLS) linux_set_cloned_tls(td2, args->tls); /* * If CLONE_PARENT is set, then the parent of the new process will be * the same as that of the calling process. */ if (args->flags & LINUX_CLONE_PARENT) { sx_xlock(&proctree_lock); PROC_LOCK(p2); proc_reparent(p2, td->td_proc->p_pptr); PROC_UNLOCK(p2); sx_xunlock(&proctree_lock); } #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 /* * 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; return (0); }
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 %p, parent tid: %p, " "child tid: %p"), (unsigned)args->flags, args->stack, args->parent_tidptr, 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 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))) 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, NULL, 0); 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.")); /* 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); }