| 1,5 → 1,5 |
|---|
| /* |
| * Copyright (C) 2006 Ondrej Palkovsky |
| * Copyright (C) 2006 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| 24,36 → 24,49 |
|---|
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| */ |
| |
| /** @addtogroup libc |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <sys/mman.h> |
| #include <as.h> |
| #include <libc.h> |
| #include <unistd.h> |
| |
| void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
| /** Mremap syscall */ |
| void *mremap(void *address, size_t size, unsigned long flags) |
| { |
| if (!start) |
| start = as_get_mappable_page(length); |
| |
| // if (! ((flags & MAP_SHARED) ^ (flags & MAP_PRIVATE))) |
| // return MAP_FAILED; |
| if (! (flags & MAP_ANONYMOUS)) |
| return MAP_FAILED; |
| |
| return as_area_create(start, length, prot); |
| return (void *) __SYSCALL3(SYS_MREMAP, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
| } |
| |
| int munmap(void *start, size_t length) |
| |
| 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) |
| { |
| return as_area_destroy(start); |
| } |
| 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; |
| |
| /* Compute start of new area */ |
| res = (void *)&_heap + heapsize; |
| |
| /** @} |
| */ |
| heapsize += incr; |
| |
| return res; |
| } |