| #include "../git-compat-util.h" |
| |
| void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
| { |
| size_t n = 0; |
| |
| if (start != NULL || flags != MAP_PRIVATE || prot != PROT_READ) |
| die("Invalid usage of mmap when built with NO_MMAP"); |
| |
| if (length == 0) { |
| errno = EINVAL; |
| return MAP_FAILED; |
| } |
| |
| start = malloc(length); |
| if (start == NULL) { |
| errno = ENOMEM; |
| return MAP_FAILED; |
| } |
| |
| while (n < length) { |
| ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n); |
| |
| if (count == 0) { |
| memset((char *)start+n, 0, length-n); |
| break; |
| } |
| |
| if (count < 0) { |
| free(start); |
| errno = EACCES; |
| return MAP_FAILED; |
| } |
| |
| n += count; |
| } |
| |
| return start; |
| } |
| |
| int git_munmap(void *start, size_t length) |
| { |
| free(start); |
| return 0; |
| } |