diff options
| -rw-r--r-- | shell/hush.c | 38 |
1 files changed, 22 insertions, 16 deletions
diff --git a/shell/hush.c b/shell/hush.c index 9181641..19d516d 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -86,6 +86,15 @@ extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ #include "busybox.h" /* for struct bb_applet */ +#if !BB_MMU +/* A bit drastic. Can allow some simpler commands + * by analysing command in generate_stream_from_list() + */ +#undef ENABLE_HUSH_TICK +#define ENABLE_HUSH_TICK 0 +#endif + + /* If you comment out one of these below, it will be #defined later * to perform debug printfs to stderr: */ #define debug_printf(...) do {} while (0) @@ -1268,7 +1277,7 @@ static int setup_redirects(struct child_prog *prog, int squirrel[]) squirrel[redir->fd] = dup(redir->fd); } if (openfd == -3) { - close(openfd); + //close(openfd); // close(-3) ??! } else { dup2(openfd, redir->fd); if (redir->dup == -1) @@ -1291,8 +1300,9 @@ static void restore_redirects(int squirrel[]) } } -/* never returns */ -/* XXX no exit() here. If you don't exec, use _exit instead. +/* Called after [v]fork() in run_pipe_real(), or from builtin_exec(). + * Never returns. + * XXX no exit() here. If you don't exec, use _exit instead. * The at_exit handlers apparently confuse the calling process, * in particular stdin handling. Not sure why? -- because of vfork! (vda) */ static void pseudo_exec_argv(char **argv) @@ -1359,6 +1369,8 @@ static void pseudo_exec_argv(char **argv) _exit(1); } +/* Called after [v]fork() in run_pipe_real() + */ static void pseudo_exec(struct child_prog *child) { // FIXME: buggy wrt NOMMU! Must not modify any global data @@ -1370,7 +1382,9 @@ static void pseudo_exec(struct child_prog *child) } if (child->group) { - // FIXME: do not modify globals! Think vfork! +#if !BB_MMU + bb_error_msg_and_exit("nested lists are not supported on NOMMU"); +#else #if ENABLE_HUSH_INTERACTIVE debug_printf_exec("pseudo_exec: setting interactive_fd=0\n"); interactive_fd = 0; /* crucial!!!! */ @@ -1380,6 +1394,7 @@ static void pseudo_exec(struct child_prog *child) /* OK to leak memory by not calling free_pipe_list, * since this process is about to exit */ _exit(rcode); +#endif } /* Can happen. See what bash does with ">foo" by itself. */ @@ -1787,14 +1802,8 @@ static int run_pipe_real(struct pipe *pi) } #endif /* in non-interactive case fatal sigs are already SIG_DFL */ - if (nextin != 0) { - dup2(nextin, 0); - close(nextin); - } - if (nextout != 1) { - dup2(nextout, 1); - close(nextout); - } + xmove_fd(nextin, 0); + xmove_fd(nextout, 1); if (pipefds[0] != -1) { close(pipefds[0]); /* opposite end of our output pipe */ } @@ -3084,17 +3093,14 @@ static int redirect_opt_num(o_string *o) } #if ENABLE_HUSH_TICK +/* NB: currently disabled on NOMMU */ static FILE *generate_stream_from_list(struct pipe *head) { FILE *pf; int pid, channel[2]; xpipe(channel); -#if BB_MMU pid = fork(); -#else - pid = vfork(); -#endif if (pid < 0) { bb_perror_msg_and_die("fork"); } else if (pid == 0) { |