Martijn Dekker <[email protected]> wrote: > Big bad bug: it appears that subshells always return status 0 in traps. > > Bug found in dash 0.5.9 and later. > > $ src/dash -c 'trap "(false) && echo BUG" INT; kill -s INT $$' > BUG > $ src/dash -c 'trap "(false) && echo BUG" EXIT' > BUG > $ src/dash -c 'trap "(false); echo \$?" EXIT' > 0 > > Workaround: if an explicit 'exit' is given, it works as expected. > > $ src/dash -c 'trap "(false; exit \$?); echo \$?" EXIT' > 1
Thanks for the report. This patch should fix the problem: ---8<--- We unconditionally restore the saved status in exitreset, which is incorrect as we only want to do it for exitcmd and returncmd. This patch fixes the problem by introducing EXEND. Reported-by: Martijn Dekker <[email protected]> Fixes: da30b4b78769 ("[BUILTIN] Exit without arguments in a trap...") Signed-off-by: Herbert Xu <[email protected]> diff --git a/src/error.h b/src/error.h index 9630b56..94e30a2 100644 --- a/src/error.h +++ b/src/error.h @@ -66,7 +66,8 @@ extern int exception; /* exceptions */ #define EXINT 0 /* SIGINT received */ #define EXERROR 1 /* a generic error */ -#define EXEXIT 4 /* exit the shell */ +#define EXEND 3 /* exit the shell */ +#define EXEXIT 4 /* exit the shell via exitcmd */ /* diff --git a/src/eval.c b/src/eval.c index 546ee1b..3cea2a3 100644 --- a/src/eval.c +++ b/src/eval.c @@ -114,12 +114,13 @@ STATIC const struct builtincmd bltin = { INCLUDE "eval.h" EXITRESET { - evalskip = 0; - loopnest = 0; if (savestatus >= 0) { - exitstatus = savestatus; + if (exception == EXEXIT || evalskip == SKIPFUNCDEF) + exitstatus = savestatus; savestatus = -1; } + evalskip = 0; + loopnest = 0; } #endif @@ -314,7 +315,7 @@ out: if (flags & EV_EXIT) { exexit: - exraise(EXEXIT); + exraise(EXEND); } return exitstatus; diff --git a/src/exec.c b/src/exec.c index 9d0215a..87354d4 100644 --- a/src/exec.c +++ b/src/exec.c @@ -143,7 +143,7 @@ shellexec(char **argv, const char *path, int idx) exitstatus = exerrno; TRACE(("shellexec failed for %s, errno %d, suppressint %d\n", argv[0], e, suppressint )); - exerror(EXEXIT, "%s: %s", argv[0], errmsg(e, E_EXEC)); + exerror(EXEND, "%s: %s", argv[0], errmsg(e, E_EXEC)); /* NOTREACHED */ } diff --git a/src/main.c b/src/main.c index 6d53e00..6b3a090 100644 --- a/src/main.c +++ b/src/main.c @@ -111,7 +111,7 @@ main(int argc, char **argv) e = exception; s = state; - if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) + if (e == EXEND || e == EXEXIT || s == 0 || iflag == 0 || shlvl) exitshell(); reset(); -- Email: Herbert Xu <[email protected]> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
