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Drag memory-mapped file handling into C++

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This commit is contained in:
Eric Fischer 2016-04-27 12:41:49 -07:00
parent fb9f3b6068
commit 3d56a56464
1 changed files with 7 additions and 4 deletions
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9
memfile.c → memfile.cpp
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@ -2,7 +2,10 @@
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#include <sys/mman.h> #include <sys/mman.h>
extern "C" {
#include "memfile.h" #include "memfile.h"
}
#define INCREMENT 131072 #define INCREMENT 131072
@ -11,12 +14,12 @@ struct memfile *memfile_open(int fd) {
return NULL; return NULL;
} }
char *map = mmap(NULL, INCREMENT, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); char *map = (char *) mmap(NULL, INCREMENT, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (map == MAP_FAILED) { if (map == MAP_FAILED) {
return NULL; return NULL;
} }
struct memfile *mf = malloc(sizeof(struct memfile)); struct memfile *mf = (struct memfile *) malloc(sizeof(struct memfile));
if (mf == NULL) { if (mf == NULL) {
munmap(map, INCREMENT); munmap(map, INCREMENT);
return NULL; return NULL;
@ -58,7 +61,7 @@ int memfile_write(struct memfile *file, void *s, long long len) {
return -1; return -1;
} }
file->map = mmap(NULL, file->len, PROT_READ | PROT_WRITE, MAP_SHARED, file->fd, 0); file->map = (char *) mmap(NULL, file->len, PROT_READ | PROT_WRITE, MAP_SHARED, file->fd, 0);
if (file->map == MAP_FAILED) { if (file->map == MAP_FAILED) {
return -1; return -1;
} }