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Added exit.c that seemed to be out of tree.

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Bahadir Balban
2008-11-09 11:42:10 +02:00
parent 88ca2033f7
commit 513d5aaac8
1 changed files with 102 additions and 0 deletions
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102
tasks/mm0/src/exit.c Normal file
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/*
* exit()
*
* Copyright (C) 2008 Bahadir Balban
*/
#include <task.h>
#include <file.h>
#include <utcb.h>
#include <vm_area.h>
#include <syscalls.h>
#include <l4lib/arch/syslib.h>
#include <l4lib/arch/syscalls.h>
#include <l4lib/exregs.h>
#include <l4lib/ipcdefs.h>
#include <lib/malloc.h>
/*
* Sends vfs task information about forked child, and its utcb
*/
int vfs_notify_exit(struct tcb *task, int status)
{
int err = 0;
// printf("%s/%s\n", __TASKNAME__, __FUNCTION__);
l4_save_ipcregs();
/* Write parent and child information */
write_mr(L4SYS_ARG0, task->tid);
write_mr(L4SYS_ARG1, status);
if ((err = l4_sendrecv(VFS_TID, VFS_TID,
L4_IPC_TAG_NOTIFY_EXIT)) < 0) {
printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, err);
goto out;
}
/* Check if syscall was successful */
if ((err = l4_get_retval()) < 0) {
printf("%s: VFS returned ipc error: %d.\n",
__FUNCTION__, err);
goto out;
}
out:
l4_restore_ipcregs();
return err;
}
/* Closes all file descriptors of a task */
int task_close_files(struct tcb *task)
{
int err = 0;
/* Flush all file descriptors */
for (int fd = 0; fd < TASK_FILES_MAX; fd++)
if (task->files->fd[fd].vmfile)
if ((err = sys_close(task, fd)) < 0) {
printf("File close error. Tid: %d,"
" fd: %d, error: %d\n",
task->tid, fd, err);
break;
}
return err;
}
void sys_exit(struct tcb *task, int status)
{
struct task_ids ids = {
.tid = task->tid,
.spid = task->spid,
.tgid = task->tgid,
};
/* Flush all IO on task's files and close fds */
task_close_files(task);
/* Tell vfs that task is exiting */
vfs_notify_exit(task, status);
/* Remove utcb shm areas from vfs */
// printf("Unmapping 0x%p from vfs as utcb of %d\n", task->utcb, task->tid);
utcb_unmap_from_task(task, find_task(VFS_TID));
/* Free task's local tcb */
tcb_destroy(task);
/* Ask the kernel to delete it from its records */
l4_thread_control(THREAD_DESTROY, &ids);
/* TODO: Wake up any waiters about task's destruction */
#if 0
struct tcb *parent = find_task(task->parentid);
if (parent->waiting) {
exregs_set_mr_return(status);
l4_exchange_registers(parent->tid);
l4_thread_control(THREAD_RUN, parent->tid);
}
#endif
}