system/uapp/psutils/kill.c

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>

#include <zircon/syscalls.h>
#include <task-utils/walker.h>

zx_koid_t task_id;

zx_status_t callback(void* unused_ctx, int depth, zx_handle_t handle,
                     zx_koid_t koid, zx_koid_t parent_koid) {
    if (koid == task_id) {
        zx_task_kill(handle);
        // found and killed the task - abort the search
        return ZX_ERR_INTERNAL;
    }
    return ZX_OK;
}

int main(int argc, char** argv) {
    if (argc != 2) {
        fprintf(stderr, "usage: %s <task id>\n", argv[0]);
        return -1;
    }

    task_id = atoll(argv[1]);

    zx_status_t status = walk_root_job_tree(callback, callback, NULL, NULL);
    if (status == ZX_OK) {
        fprintf(stderr, "no task found\n");
        return -1;
    }
}