| /* |
| * mmap.c |
| */ |
| |
| #include <stdint.h> |
| #include <errno.h> |
| #include <sys/syscall.h> |
| #include <sys/mman.h> |
| #include <unistd.h> |
| #include <bitsize.h> |
| #include <klibc/sysconfig.h> |
| |
| /* |
| * Set in SYSCALLS whether or not we should use an unadorned mmap() system |
| * call (typical on 64-bit architectures). |
| */ |
| #if !_KLIBC_NO_MMU && _KLIBC_USE_MMAP2 |
| |
| /* This architecture uses mmap2(). The Linux mmap2() system call takes |
| a page offset as the offset argument. We need to make sure we have |
| the proper conversion in place. */ |
| |
| extern void *__mmap2(void *, size_t, int, int, int, size_t); |
| |
| void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
| { |
| const int mmap2_shift = _KLIBC_MMAP2_SHIFT; |
| const off_t mmap2_mask = ((off_t)1 << mmap2_shift) - 1; |
| |
| if ( offset & mmap2_mask ) { |
| errno = EINVAL; |
| return MAP_FAILED; |
| } |
| |
| return __mmap2(start, length, prot, flags, fd, (size_t)offset >> mmap2_shift); |
| } |
| |
| #endif |