+
+PUBLIC_FN void *mmap_file(void *addr, size_t length, int prot, int flags, char *path, off_t offset) {
+ assert((flags&MAP_ANONYMOUS) == 0);
+ assert(prot&(PROT_EXEC|PROT_READ|PROT_WRITE));
+ int open_flags = O_CLOEXEC;
+ if ((prot & (PROT_READ|PROT_EXEC)) && !(prot&PROT_WRITE)) open_flags |= O_RDONLY;
+ else if ((prot & (PROT_READ|PROT_EXEC))) open_flags |= O_RDWR;
+ else open_flags |= O_WRONLY;
+ int fd = open(path, open_flags);
+ if (fd == -1) return NULL;
+ void *r = mmap(addr, length, prot, flags, fd, offset);
+ int errno_ = errno;
+ close(fd);
+ errno = errno_;
+ return (r==MAP_FAILED) ? NULL : r;
+}