void program_main(const argdata_t *ad) {
// Extract executable file descriptor and argument data from sequence.
argdata_seq_iterator_t it;
argdata_seq_iterate(ad, &it);
const argdata_t *fdv, *argv;
int fd;
if (!argdata_seq_next(&it, &fdv) || argdata_get_fd(fdv, &fd) != 0 ||
!argdata_seq_next(&it, &argv))
_Exit(127);
// Serialize argument data that needs to be passed to the executable.
size_t buflen, fdslen;
argdata_get_buffer_length(argv, &buflen, &fdslen);
int *fds = malloc(fdslen * sizeof(fds[0]) + buflen);
if (fds == NULL)
_Exit(127);
void *buf = &fds[fdslen];
fdslen = argdata_get_buffer(argv, buf, fds);
// Register file descriptors.
struct fd_table ft;
fd_table_init(&ft);
for (size_t i = 0; i < fdslen; ++i)
if (!fd_table_insert_existing(&ft, i, fds[i]))
_Exit(127);
// Start emulation.
emulate(fd, buf, buflen, &posix_syscalls);
_Exit(127);
}
void program_main(const argdata_t *ad) {
// Extract executable file descriptor and argument data from sequence.
argdata_seq_iterator_t it;
argdata_seq_iterate(ad, &it);
const argdata_t *fdv, *argv;
int fd;
if (!argdata_seq_next(&it, &fdv) || argdata_get_fd(fdv, &fd) != 0 ||
!argdata_seq_next(&it, &argv)) {
static const char message[] = "Failed to parse argument data\n";
write(2, message, sizeof(message) - 1);
_Exit(127);
}
// Execute the program.
int error = program_exec(fd, argv);
// Execution failed. Print error message without depending on stdio.
static const char prefix[] = "Failed to start executable: ";
struct iovec iov[3] = {
{.iov_base = (char *)prefix, .iov_len = sizeof(prefix) - 1},
{.iov_base = strerror(error), .iov_len = strlen(iov[1].iov_base)},