diff options
| -rw-r--r-- | shell/README | 4 | ||||
| -rw-r--r-- | shell/hush.c | 67 |
2 files changed, 66 insertions, 5 deletions
diff --git a/shell/README b/shell/README index 989587a..c3e7132 100644 --- a/shell/README +++ b/shell/README @@ -1,6 +1,10 @@ Various bits of what is known about busybox shells, in no particular order. 2007-05-03 +hush: new bug spotted: Ctrl-C on "while true; do true; done" kills shell, +not just the loop. + +2007-05-03 hush: update on "sleep 1 | exit 3; echo $?" bug. parse_stream_outer() repeatedly calls parse_stream(). parse_stream() is now fixed to stop on ';' in this example, diff --git a/shell/hush.c b/shell/hush.c index 4d5e412..c51ed1a 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -85,11 +85,12 @@ /* 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) -/* Finer-grained debug switch */ -#define debug_printf_jobs(...) do {} while (0) -#define debug_printf_exec(...) do {} while (0) +#define debug_printf(...) do {} while (0) +/* Finer-grained debug switches */ +#define debug_printf_jobs(...) do {} while (0) +#define debug_printf_exec(...) do {} while (0) #define debug_printf_parse(...) do {} while (0) +#define debug_print_tree(a, b) do {} while (0) #ifndef debug_printf @@ -1860,6 +1861,61 @@ static int run_pipe_real(struct pipe *pi) return -1; } +#ifndef debug_print_tree +static void debug_print_tree(struct pipe *pi, int lvl) +{ + static const char *PIPE[] = { + [PIPE_SEQ] = "SEQ", + [PIPE_AND] = "AND", + [PIPE_OR ] = "OR", + [PIPE_BG ] = "BG", + }; + static const char *RES[] = { + [RES_NONE ] = "NONE" , + [RES_IF ] = "IF" , + [RES_THEN ] = "THEN" , + [RES_ELIF ] = "ELIF" , + [RES_ELSE ] = "ELSE" , + [RES_FI ] = "FI" , + [RES_FOR ] = "FOR" , + [RES_WHILE] = "WHILE", + [RES_UNTIL] = "UNTIL", + [RES_DO ] = "DO" , + [RES_DONE ] = "DONE" , + [RES_XXXX ] = "XXXX" , + [RES_IN ] = "IN" , + [RES_SNTX ] = "SNTX" , + }; + + int pin, prn; + char **argv; + pin = 0; + while (pi) { + fprintf(stderr, "%*spipe %d r_mode=%s followup=%d %s\n", lvl*2, "", + pin, RES[pi->r_mode], pi->followup, PIPE[pi->followup]); + prn = 0; + while (prn < pi->num_progs) { + fprintf(stderr, "%*s prog %d", lvl*2, "", prn); + if (pi->progs[prn].group) { + fprintf(stderr, " group: (argv=%p)\n", pi->progs[prn].argv); + debug_print_tree(pi->progs[prn].group, lvl+1); + prn++; + continue; + } + argv = pi->progs[prn].argv; + if (argv) while (*argv) { + fprintf(stderr, " '%s'", *argv); + argv++; + } + fprintf(stderr, "\n"); + prn++; + } + pi = pi->next; + pin++; + } +} +#endif + // NB: called by pseudo_exec, and therefore must not modify any // global data until exec/_exit (we can be a child after vfork!) static int run_list_real(struct pipe *pi) @@ -2088,7 +2144,7 @@ static int run_list(struct pipe *pi) /* free_pipe_list has the side effect of clearing memory * In the long run that function can be merged with run_list_real, * but doing that now would hobble the debugging effort. */ - free_pipe_list(pi,0); + free_pipe_list(pi, 0); return rcode; } @@ -3177,6 +3233,7 @@ static int parse_stream_outer(struct in_str *inp, int flag) done_word(&temp, &ctx); done_pipe(&ctx, PIPE_SEQ); debug_printf_exec("parse_stream_outer: run_list\n"); + debug_print_tree(ctx.list_head, 0); run_list(ctx.list_head); } else { if (ctx.old_flag != 0) { |