/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
 *
 * Authors:
 *      Alvaro Lopez Ortega <alvaro@alobbs.com>
 *
 * Copyright (C) 2001-2014 Alvaro Lopez Ortega
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include "common-internal.h"
#include "shm.h"
#include "util.h"

#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif

#include <sys/stat.h>
#include <unistd.h>

#define ENTRIES "shm"

ret_t
cherokee_shm_init (cherokee_shm_t *shm)
{
	shm->len = 0;
	shm->mem = NULL;

	cherokee_buffer_init (&shm->name);

	return ret_ok;
}


ret_t
cherokee_shm_mrproper (cherokee_shm_t *shm)
{
	if (shm->mem) {
		munmap (shm->mem, shm->len);
	}

	cherokee_buffer_mrproper (&shm->name);
	return ret_ok;
}


ret_t
cherokee_shm_create (cherokee_shm_t *shm, char *name, size_t len)
{
	int re;
	int fd;

	fd = cherokee_open (name, O_RDWR | O_EXCL | O_CREAT, 0600);
	if (fd < 0) {
		return ret_error;
	}

	re = ftruncate (fd, len);
	if (re < 0) {
		cherokee_fd_close (fd);
		return ret_error;
	}

	shm->mem = mmap (0, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (shm->mem == MAP_FAILED) {
		shm->mem = NULL;
		cherokee_fd_close (fd);
		return ret_error;
	}

	cherokee_fd_close (fd);

	shm->len = len;
	cherokee_buffer_add (&shm->name, name, strlen(name));

	TRACE (ENTRIES, "SHM (mmap: '%s', len: %d) created\n", shm->name.buf, len);
	return ret_ok;
}

ret_t
cherokee_shm_map (cherokee_shm_t    *shm,
                  cherokee_buffer_t *name)
{
	int         re;
	int         fd;
	struct stat info;

	fd = cherokee_open (name->buf, O_RDWR, 0600);
	if (fd < 0) {
		return ret_error;
	}

	re = cherokee_fstat (fd, &info);
	if (re != 0) {
		cherokee_fd_close (fd);
		return ret_error;
	}

	shm->mem = mmap (0, info.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (shm->mem == MAP_FAILED) {
		shm->mem = NULL;
		cherokee_fd_close (fd);
		return ret_error;
	}

	cherokee_fd_close (fd);

	cherokee_buffer_clean      (&shm->name);
	cherokee_buffer_add_buffer (&shm->name, name);

	TRACE (ENTRIES, "SHM (mmap: '%s', size: %d) opened\n", name->buf, info.st_size);
	return ret_ok;
}