/****************************************************************/

/*  mdso: midipix dso scavenger                                 */

/*  Copyright (C) 2015--2017  Z. Gilboa                         */

/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */

/****************************************************************/

#include <stdint.h>

#include <stdbool.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/mman.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <mdso/mdso.h>

#include "mdso_driver_impl.h"

#include "mdso_errinfo_impl.h"

int mdso_map_input(

	const struct mdso_driver_ctx *	dctx,

	int				fd,

	const char *			path,

	int				prot,

	struct mdso_input *		map)

{

	int		ret;

	struct stat	st;

	bool		fnew;

	int		fdcwd;

	fdcwd = mdso_driver_fdcwd(dctx);

	if ((fnew = (fd < 0)))

		fd  = openat(fdcwd,path,O_RDONLY | O_CLOEXEC);

	if (fd < 0)

		return MDSO_SYSTEM_ERROR(dctx);

	if ((ret = fstat(fd,&st) < 0) && fnew)

		close(fd);

	else if ((st.st_size == 0) && fnew)

		close(fd);

	if (ret < 0)

		return MDSO_SYSTEM_ERROR(dctx);

	if (st.st_size == 0) {

		map->size = 0;

		map->addr = 0;

	} else {

		map->size = st.st_size;

		map->addr = mmap(0,map->size,prot,MAP_PRIVATE,fd,0);

	}

	if (fnew)

		close(fd);

	return (map->addr == MAP_FAILED)

		? MDSO_SYSTEM_ERROR(dctx)

		: 0;

}

int mdso_unmap_input(struct mdso_input * map)

{

	return map->size ? munmap(map->addr,map->size) : 0;

}