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/***************************************************************************
* Copyright (C) 2008 by Alexander Block *
* ablock@blocksoftware.net *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "config.h"
#include "shm.h"
#include "buf.h"
#include "error.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
struct shm_header
{
int buf_size;
};
/////////////
int hexec_shm_create(struct hexec_shm* shm, const char* shm_name, struct hexec_buf* buf)
{
int fd = shm_open(shm_name, O_CREAT | O_EXCL | O_RDWR, S_IRWXU | S_IRWXG);
if(fd == -1)
{
hexec_error("failed to create shared memory object %s\n", shm_name);
return -1;
}
int mmap_size = sizeof(struct shm_header) + buf->buf_size;
if(ftruncate(fd, mmap_size))
{
close(fd);
shm_unlink(shm_name);
hexec_error("failed to resize shared memory object %s\n", shm_name);
return -1;
}
char* mmap_buf = mmap(NULL, mmap_size, PROT_WRITE, MAP_SHARED, fd, 0);
if(mmap_buf == MAP_FAILED)
{
close(fd);
shm_unlink(shm_name);
hexec_error("failed to map shared memory object %s\n", shm_name);
return -1;
}
struct shm_header header;
header.buf_size = buf->buf_size;
memcpy(mmap_buf, &header, sizeof(struct shm_header));
hexec_buf_copy_to(buf, mmap_buf + sizeof(struct shm_header), buf->buf_size);
close(fd);
shm->owner = true;
shm->name = strdup(shm_name);
shm->mmap = mmap_buf;
shm->mmap_size = mmap_size;
shm->buf = mmap_buf + sizeof(struct shm_header);
shm->buf_size = buf->buf_size;
return 0;
}
int hexec_shm_open(struct hexec_shm* shm, const char* shm_name)
{
int fd = shm_open(shm_name, O_RDONLY, 0);
if(fd == -1)
{
hexec_error("failed to open shared memory object %s\n", shm_name);
return -1;
}
char* mmap_buf = mmap(NULL, sizeof(struct shm_header), PROT_READ, MAP_SHARED, fd, 0);
if(mmap_buf == MAP_FAILED)
{
close(fd);
hexec_error("failed to map shared memory object %s\n", shm_name);
return -1;
}
struct shm_header header;
memcpy(&header, mmap_buf, sizeof(struct shm_header));
munmap(mmap_buf, sizeof(struct shm_header));
int mmap_size = sizeof(struct shm_header) + header.buf_size;
mmap_buf = mmap(NULL, mmap_size, PROT_READ, MAP_SHARED, fd, 0);
if(mmap_buf == MAP_FAILED)
{
close(fd);
hexec_error("failed to map shared memory object %s\n", shm_name);
return -1;
}
close(fd);
shm->owner = false;
shm->name = strdup(shm_name);
shm->mmap = mmap_buf;
shm->mmap_size = mmap_size;
shm->buf = mmap_buf + sizeof(struct shm_header);
shm->buf_size = header.buf_size;
return 0;
}
int hexec_shm_close(struct hexec_shm* shm)
{
if(munmap(shm->mmap, shm->mmap_size))
hexec_fatal("failed to unmap shared memory object %s\n", shm->name);
if(shm->owner && shm_unlink(shm->name))
hexec_fatal("failed to unlink shared memory object %s\n", shm->name);
free(shm->name);
return 0;
}
int hexec_shm_to_buf(struct hexec_shm* shm, struct hexec_buf* buf)
{
return hexec_buf_create_from(buf, shm->buf, shm->buf_size, false);
}
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