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a better API for loading PGF & NGF files

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This commit is contained in:
krangelov
2021-08-06 16:50:21 +02:00
parent dc1644563f
commit 2d6bcd1953
7 changed files with 174 additions and 33 deletions
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47
src/runtime/c/db.cxx
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@@ -270,26 +270,35 @@ struct malloc_state
moffset root_offset;
};
DB::DB(const char* pathname) {
fd = open(pathname, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
if (fd < 0)
throw std::system_error(errno, std::generic_category());
size_t file_size = lseek(fd, 0, SEEK_END);
if (file_size == ((off_t) -1))
throw std::system_error(errno, std::generic_category());
DB::DB(const char* pathname, int flags, int mode) {
size_t file_size;
bool is_new = false;
if (file_size == 0) {
if (pathname == NULL) {
fd = -1;
file_size = getpagesize();
if (ftruncate(fd, file_size) < 0)
is_new = true;
} else {
fd = open(pathname, flags, mode);
if (fd < 0)
throw std::system_error(errno, std::generic_category());
is_new = true;
file_size = lseek(fd, 0, SEEK_END);
if (file_size == ((off_t) -1))
throw std::system_error(errno, std::generic_category());
is_new = false;
if (file_size == 0) {
file_size = getpagesize();
if (ftruncate(fd, file_size) < 0)
throw std::system_error(errno, std::generic_category());
is_new = true;
}
}
int mflags = (fd < 0) ? (MAP_PRIVATE | MAP_ANONYMOUS) : MAP_SHARED;
ms = (malloc_state*)
mmap(NULL, file_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
mmap(NULL, file_size, PROT_READ | PROT_WRITE, mflags, fd, 0);
if (ms == MAP_FAILED)
throw std::system_error(errno, std::generic_category());
@@ -306,7 +315,9 @@ DB::~DB() {
ms->top + size + sizeof(size_t);
munmap(ms,size);
close(fd);
if (fd >= 0)
close(fd);
}
void DB::sync()
@@ -803,8 +814,10 @@ DB::malloc_internal(size_t bytes)
size_t new_size =
old_size + alloc_size;
if (ftruncate(fd, new_size) < 0)
throw std::system_error(errno, std::generic_category());
if (fd >= 0) {
if (ftruncate(fd, new_size) < 0)
throw std::system_error(errno, std::generic_category());
}
malloc_state* new_ms =
(malloc_state*) mremap(ms, old_size, new_size, MREMAP_MAYMOVE);