| 29,7 → 29,40 |
|---|
| #include <libc.h> |
| #include <unistd.h> |
| |
| /** Mremap syscall */ |
| void *mremap(void *address, size_t size, unsigned long flags) |
| { |
| return (void *) __SYSCALL3(SYS_MREMAP, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
| } |
| |
| |
| static size_t heapsize = 0; |
| /* Start of heap linker symbol */ |
| extern char _heap; |
| |
| /** Sbrk emulation |
| * |
| * @param size New area that should be allocated or negative, |
| if it should be shrinked |
| * @return Pointer to newly allocated area |
| */ |
| void *sbrk(ssize_t incr) |
| { |
| void *res; |
| /* Check for invalid values */ |
| if (incr < 0 && -incr > heapsize) |
| return NULL; |
| /* Check for too large value */ |
| if (incr > 0 && incr+heapsize < heapsize) |
| return NULL; |
| /* Check for too small values */ |
| if (incr < 0 && incr+heapsize > heapsize) |
| return NULL; |
| |
| res = mremap(&_heap, heapsize + incr,0); |
| if (!res) |
| return NULL; |
| res = (void *)&_heap + incr; |
| heapsize += incr; |
| return res; |
| } |