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Commit | Line | Data |
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4050c0df | 1 | #include "../git-compat-util.h" |
730d48a2 | 2 | |
d6779124 | 3 | void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
730d48a2 | 4 | { |
8e554429 | 5 | size_t n = 0; |
730d48a2 | 6 | |
bf1e6da7 | 7 | if (start != NULL || flags != MAP_PRIVATE || prot != PROT_READ) |
d6779124 | 8 | die("Invalid usage of mmap when built with NO_MMAP"); |
730d48a2 | 9 | |
730d48a2 | 10 | start = xmalloc(length); |
f48000fc | 11 | if (start == NULL) { |
730d48a2 JS |
12 | errno = ENOMEM; |
13 | return MAP_FAILED; | |
14 | } | |
15 | ||
f48000fc | 16 | while (n < length) { |
9aa91af0 | 17 | ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n); |
730d48a2 | 18 | |
f48000fc | 19 | if (count == 0) { |
8e554429 | 20 | memset((char *)start+n, 0, length-n); |
730d48a2 JS |
21 | break; |
22 | } | |
23 | ||
f48000fc | 24 | if (count < 0) { |
730d48a2 JS |
25 | free(start); |
26 | errno = EACCES; | |
27 | return MAP_FAILED; | |
28 | } | |
29 | ||
30 | n += count; | |
31 | } | |
32 | ||
730d48a2 JS |
33 | return start; |
34 | } | |
35 | ||
d6779124 | 36 | int git_munmap(void *start, size_t length) |
730d48a2 | 37 | { |
730d48a2 | 38 | free(start); |
730d48a2 JS |
39 | return 0; |
40 | } |