Blame src/helper/mdso_map_input.c

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/****************************************************************/
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/*  mdso: midipix dso scavenger                                 */
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/*  Copyright (C) 2015--2017  Z. Gilboa                         */
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/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */
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/****************************************************************/
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#include <stdint.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <mdso/mdso.h>
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#include "mdso_driver_impl.h"
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#include "mdso_errinfo_impl.h"
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int mdso_map_input(
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	const struct mdso_driver_ctx *	dctx,
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	int				fd,
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	const char *			path,
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	int				prot,
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	struct mdso_input *		map)
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{
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	int		ret;
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	struct stat	st;
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	bool		fnew;
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	int		fdcwd;
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	fdcwd = mdso_driver_fdcwd(dctx);
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	if ((fnew = (fd < 0)))
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		fd  = openat(fdcwd,path,O_RDONLY | O_CLOEXEC);
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	if (fd < 0)
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		return MDSO_SYSTEM_ERROR(dctx);
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	if ((ret = fstat(fd,&st) < 0) && fnew)
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		close(fd);
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	else if ((st.st_size == 0) && fnew)
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		close(fd);
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	if (ret < 0)
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		return MDSO_SYSTEM_ERROR(dctx);
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	if (st.st_size == 0) {
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		map->size = 0;
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		map->addr = 0;
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	} else {
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		map->size = st.st_size;
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		map->addr = mmap(0,map->size,prot,MAP_PRIVATE,fd,0);
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	}
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	if (fnew)
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		close(fd);
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	return (map->addr == MAP_FAILED)
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		? MDSO_SYSTEM_ERROR(dctx)
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		: 0;
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}
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int mdso_unmap_input(struct mdso_input * map)
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{
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	return map->size ? munmap(map->addr,map->size) : 0;
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}