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// Copyright 2018 Mimecast Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "gprocess.h"
#include "../vfd.h"
#include "gioop.h"
void _gprocess_vfd_map_destroy_cb(void *data)
{
vfd_destroy(data);
}
gprocess_s* gprocess_new(const long pid, const long mapped_pid)
{
gprocess_s* gp = Malloc(gprocess_s);
gp->pid = pid;
gp->mapped_pid = mapped_pid;
gp->max_mapped_fd = 0;
gp->fd_map = hmap_new_l(1024);
gp->vfd_map = hmap_new_l(1024);
gp->vfd_map->data_destroy = _gprocess_vfd_map_destroy_cb;
return gp;
}
void gprocess_destroy(gprocess_s *gp)
{
hmap_destroy(gp->vfd_map);
hmap_destroy(gp->fd_map);
free(gp);
}
void gprocess_create_vfd_by_realfd(gprocess_s *gp, gtask_s *t, generate_s *g)
{
if (t->fd < 0)
return;
// Check whether the real FD is still open according to the .capture log
long old_mapped = (long) hmap_get_l(gp->fd_map, t->fd);
if (old_mapped) {
// That real file descriptor is already with a mapping to a virtual
// file descriptor. This may happen when SystemTap missed to trace a
// 'close' syscall. We are inserting a close now...
t->vfd = hmap_get_l(gp->vfd_map, old_mapped);
hmap_remove_l(gp->fd_map, t->fd);
hmap_remove_l(gp->vfd_map, old_mapped);
if (t->vfd) {
generate_vsize_by_path(g, t, t->vfd->path);
Gioop_write(CLOSE, "%ld|%d|close inserted", old_mapped, 0);
vsize_close(t->vsize, t->vfd);
if (!(rbuffer_insert(g->vfd_buffer, t->vfd)))
vfd_destroy(t->vfd);
}
}
t->vfd = rbuffer_get_next(g->vfd_buffer);
t->mapped_fd = ++g->num_mapped_fds;
if (!t->vfd)
t->vfd = vfd_new(t->fd, t->mapped_fd, t->path);
else
vfd_update(t->vfd, t->fd, t->mapped_fd, t->path);
t->vfd->free_path = t->path_r != NULL;
hmap_insert_l(gp->vfd_map, t->mapped_fd, t->vfd);
hmap_insert_l(gp->fd_map, t->fd, (void*)t->mapped_fd);
}
status_e gprocess_vfd_by_realfd(gprocess_s *gp, gtask_s *t)
{
t->mapped_fd = (long) hmap_get_l(gp->fd_map, t->fd);
if (t->mapped_fd == 0) {
// No corresponding virtual fd number mapping
t->has_fd = false;
} else {
t->vfd = hmap_get_l(gp->vfd_map, t->mapped_fd);
if (!t->vfd) {
return ERROR;
}
t->mapped_fd = t->vfd->mapped_fd;
}
return SUCCESS;
}
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