#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) { | |
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; | |
} |