| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include "../cache.h" |
| |
| void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset) |
| { |
| int n = 0; |
| |
| if (start != NULL || !(flags & MAP_PRIVATE)) |
| die("Invalid usage of gitfakemmap."); |
| |
| if (lseek(fd, offset, SEEK_SET) < 0) { |
| errno = EINVAL; |
| return MAP_FAILED; |
| } |
| |
| start = xmalloc(length); |
| if (start == NULL) { |
| errno = ENOMEM; |
| return MAP_FAILED; |
| } |
| |
| while (n < length) { |
| int count = read(fd, start+n, length-n); |
| |
| if (count == 0) { |
| memset(start+n, 0, length-n); |
| break; |
| } |
| |
| if (count < 0) { |
| free(start); |
| errno = EACCES; |
| return MAP_FAILED; |
| } |
| |
| n += count; |
| } |
| |
| return start; |
| } |
| |
| int gitfakemunmap(void *start, size_t length) |
| { |
| free(start); |
| return 0; |
| } |
| |