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hush: fix "(sleep 1; exit 3) & sleep 2; echo $?; wait $!; echo $?"

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function                                             old     new   delta
process_wait_result                                  414     426     +12
builtin_wait                                         283     291      +8
run_list                                             974     978      +4
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(add/remove: 0/0 grow/shrink: 3/0 up/down: 24/0)               Total: 24 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-07-07 22:56:02 +02:00
parent 2db74610cd
commit 840a4355d0
5 changed files with 26 additions and 5 deletions
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2
shell/ash_test/ash-misc/wait6.right Normal file
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@ -0,0 +1,2 @@
0
3

6
shell/ash_test/ash-misc/wait6.tests Executable file
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@ -0,0 +1,6 @@
# In bash, "wait $!" extracts correct exitcode even if bg task has already exited
# It prints 0, then 3:
(sleep 0; exit 3) & sleep 1
echo $?
wait $!
echo $?

15
shell/hush.c
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@ -832,6 +832,7 @@ struct globals {
smallint exiting; /* used to prevent EXIT trap recursion */
/* These four support $?, $#, and $1 */
smalluint last_exitcode;
smalluint last_bg_pid_exitcode;
#if ENABLE_HUSH_SET
/* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
smalluint global_args_malloced;
@ -7387,10 +7388,13 @@ static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
found_pi_and_prognum:
if (dead) {
/* child exited */
pi->cmds[i].pid = 0;
pi->cmds[i].cmd_exitcode = WEXITSTATUS(status);
int rcode = WEXITSTATUS(status);
if (WIFSIGNALED(status))
pi->cmds[i].cmd_exitcode = 128 + WTERMSIG(status);
rcode = 128 + WTERMSIG(status);
pi->cmds[i].cmd_exitcode = rcode;
if (G.last_bg_pid == pi->cmds[i].pid)
G.last_bg_pid_exitcode = rcode;
pi->cmds[i].pid = 0;
pi->alive_cmds--;
if (!pi->alive_cmds) {
if (G_interactive_fd)
@ -8215,6 +8219,7 @@ static int run_list(struct pipe *pi)
#endif
/* Last command's pid goes to $! */
G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid;
G.last_bg_pid_exitcode = 0;
debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
/* Check pi->pi_inverted? "! sleep 1 & echo $?": bash says 1. dash and ash says 0 */
rcode = EXIT_SUCCESS;
@ -9909,6 +9914,7 @@ static int FAST_FUNC builtin_wait(char **argv)
ret = waitpid(pid, &status, WNOHANG);
if (ret < 0) {
/* No */
ret = 127;
if (errno == ECHILD) {
if (G.last_bg_pid > 0 && pid == G.last_bg_pid) {
/* "wait $!" but last bg task has already exited. Try:
@ -9916,7 +9922,7 @@ static int FAST_FUNC builtin_wait(char **argv)
* In bash it prints exitcode 0, then 3.
* In dash, it is 127.
*/
/* ret = G.last_bg_pid_exitstatus - FIXME */
ret = G.last_bg_pid_exitcode;
} else {
/* Example: "wait 1". mimic bash message */
bb_error_msg("wait: pid %d is not a child of this shell", (int)pid);
@ -9925,7 +9931,6 @@ static int FAST_FUNC builtin_wait(char **argv)
/* ??? */
bb_perror_msg("wait %s", *argv);
}
ret = 127;
continue; /* bash checks all argv[] */
}
if (ret == 0) {

2
shell/hush_test/hush-misc/wait6.right Normal file
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@ -0,0 +1,2 @@
0
3

6
shell/hush_test/hush-misc/wait6.tests Executable file
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@ -0,0 +1,6 @@
# In bash, "wait $!" extracts correct exitcode even if bg task has already exited
# It prints 0, then 3:
(sleep 0; exit 3) & sleep 1
echo $?
wait $!
echo $?