int open(const char *pathname, int flags, ...) {
mode_t mode = 0;
if (flags & O_CREAT) {
/* get mode */
va_list ap;
va_start(ap, flags);
mode = va_arg(ap, mode_t);
va_end(ap);
}
return __fd_open(pathname, flags, mode);
}
int __fd_openat(int basefd, const char *pathname, int flags, mode_t mode) {
exe_file_t *f;
int fd;
if (basefd != AT_FDCWD) {
exe_file_t *bf = __get_file(basefd);
if (!bf) {
errno = EBADF;
return -1;
} else if (bf->dfile) {
klee_warning("symbolic file descriptor, ignoring (ENOENT)");
errno = ENOENT;
return -1;
}
basefd = bf->fd;
}
if (__get_sym_file(pathname)) {
/* for a symbolic file, it doesn't matter if/where it exists on disk */
return __fd_open(pathname, flags, mode);
}
for (fd = 0; fd < MAX_FDS; ++fd)
if (!(__exe_env.fds[fd].flags & eOpen))
break;
if (fd == MAX_FDS) {
errno = EMFILE;
return -1;
}
f = &__exe_env.fds[fd];
/* Should be the case if file was available, but just in case. */
memset(f, 0, sizeof *f);
int os_fd = syscall(__NR_openat, (long)basefd, __concretize_string(pathname), (long)flags, mode);
if (os_fd == -1)
return -1;
f->fd = os_fd;
f->flags = eOpen;
if ((flags & O_ACCMODE) == O_RDONLY) {
f->flags |= eReadable;
} else if ((flags & O_ACCMODE) == O_WRONLY) {
f->flags |= eWriteable;
} else { /* XXX What actually happens here if != O_RDWR. */
f->flags |= eReadable | eWriteable;
}
return fd;
}