src/sys/bin/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>

static zx_status_t callback(void* ctx, int depth, zx_handle_t handle, zx_koid_t koid,
                            zx_koid_t parent_koid) {
  zx_koid_t task_id = *(zx_koid_t*)ctx;
  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, const char** argv) {
  if (argc < 2) {
    fprintf(stderr, "usage: %s <task id>...\n", argv[0]);
    return -1;
  }

  bool errored = false;

  for (int i = 1; i < argc; i++) {
    const char* arg = argv[i];
    if ((arg[0] == 'p' || arg[1] == 'j') && (arg[1] == ':')) {
      // Skip leading "p:" or "j:".
      arg += 2;
    }
    char* endptr;
    zx_koid_t task_id = strtoll(arg, &endptr, 10);
    if (*endptr != '\0') {
      fprintf(stderr, "\"%s\" is not a valid task id\n", arg);
      errored = true;
      continue;
    }
    zx_status_t status = walk_root_job_tree(callback, callback, NULL, &task_id);
    if (status == ZX_OK) {
      fprintf(stderr, "task %lu not found\n", task_id);
      errored = true;
      continue;
    }
  }
  return errored ? -1 : 0;
}