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#include <os/os.h>
#include <basic/basic.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
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os_memory_allocate(OSMemory *memory, size_t size)
{
// @Performance: Keep the fd of /dev/zero open for the whole runtime?
int fd = open("/dev/zero", O_RDWR);
if (fd == -1) {
printf("open() failed: %s\n", strerror(errno));
return false;
}
void *address = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (address == MAP_FAILED) {
printf("mmap failed\n");
return false;
}
close(fd);
memory->size = size;
memory->p = address;
return true;
}
void
os_memory_free(OSMemory *memory)
{
munmap(memory->p, memory->size);
}
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