7 typedef struct fakemmapwritable {
12 struct fakemmapwritable *next;
15 static fakemmapwritable *writablelist = NULL;
17 void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
22 die("Invalid usage of gitfakemmap.");
24 if(lseek(fd, offset, SEEK_SET)<0) {
29 start = xmalloc(length);
36 int count = read(fd, start+n, length-n);
39 memset(start+n, 0, length-n);
52 if(prot & PROT_WRITE) {
53 fakemmapwritable *next = xmalloc(sizeof(fakemmapwritable));
55 next->length = length;
57 next->offset = offset;
58 next->next = writablelist;
65 int gitfakemunmap(void *start, size_t length)
67 fakemmapwritable *writable = writablelist, *before = NULL;
69 while(writable && (writable->start > start + length
70 || writable->start + writable->length < start)) {
72 writable = writable->next;
76 /* need to write back the contents */
79 if(writable->start != start || writable->length != length)
80 die("fakemmap does not support partial write back.");
82 if(lseek(writable->fd, writable->offset, SEEK_SET) < 0) {
89 int count = write(writable->fd, start + n, length - n);
102 before->next = writable->next;
104 writablelist = writable->next;