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Common shared memory module. Using O_CLOEXEC for opened files.

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sorgelig
2021-04-16 23:12:46 +08:00
parent 2899437499
commit 9cd404ea65
22 changed files with 186 additions and 240 deletions
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11
scaler.cpp
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@@ -14,10 +14,10 @@ with help from the MiSTer contributors including Grabulosaure
#include <fcntl.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <err.h>
#include "scaler.h"
#include "shmem.h"
mister_scaler * mister_scaler_init()
@@ -32,11 +32,9 @@ mister_scaler * mister_scaler_init()
//printf("map_start = %d map_off=%d offset=%d\n",map_start,ms->map_off,offset);
unsigned char *buffer;
ms->fd=open("/dev/mem", O_RDONLY, S_IRUSR | S_IWUSR);
ms->map=(char *)mmap(NULL, ms->num_bytes+ms->map_off,PROT_READ, MAP_SHARED, ms->fd, map_start);
if (ms->map==MAP_FAILED)
ms->map=(char *)shmem_map(map_start, ms->num_bytes+ms->map_off);
if (!ms->map)
{
printf("problem MAP_FAILED\n");
mister_scaler_free(ms);
return NULL;
}
@@ -68,8 +66,7 @@ mister_scaler * mister_scaler_init()
void mister_scaler_free(mister_scaler *ms)
{
munmap(ms->map,ms->num_bytes+ms->map_off);
close(ms->fd);
shmem_unmap(ms->map,ms->num_bytes+ms->map_off);
free(ms);
}