diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | Src/signals.c | 53 | ||||
| -rw-r--r-- | Test/C03traps.ztst | 16 |
3 files changed, 57 insertions, 18 deletions
@@ -1,3 +1,9 @@ +2004-03-10 Peter Stephenson <pws@csr.com> + + * 19575: Src/signals.c, Test/C03traps.ztst: Fix the problem + that trap '...' EXIT overrode the exit status of the function + it was in. + 2004-03-08 Clint Adams <clint@zsh.org> * 19566: Doc/Zsh/params.yo: change associative array diff --git a/Src/signals.c b/Src/signals.c index 6863421fe..affb5379b 100644 --- a/Src/signals.c +++ b/Src/signals.c @@ -931,6 +931,7 @@ dotrapargs(int sig, int *sigtr, void *sigfn) char *name, num[4]; int trapret = 0; int obreaks = breaks; + int isfunc; /* if signal is being ignored or the trap function * * is NULL, then return * @@ -948,16 +949,7 @@ dotrapargs(int sig, int *sigtr, void *sigfn) *sigtr |= ZSIG_IGNORED; lexsave(); - if (sig != SIGEXIT && sig != SIGDEBUG) { - /* - * SIGEXIT and SIGDEBUG are always run synchronously, so we don't - * need to save and restore the state. - * - * Do we actually need this at all now we queue signals - * for handling in places where they won't cause trouble? - */ - execsave(); - } + execsave(); breaks = 0; runhookdef(BEFORETRAPHOOK, NULL); if (*sigtr & ZSIG_FUNC) { @@ -970,27 +962,52 @@ dotrapargs(int sig, int *sigtr, void *sigfn) sprintf(num, "%d", sig); zaddlinknode(args, num); - trapreturn = -1; + trapreturn = -1; /* incremented by doshfunc */ sfcontext = SFC_SIGNAL; doshfunc(name, sigfn, args, 0, 1); sfcontext = osc; freelinklist(args, (FreeFunc) NULL); zsfree(name); - } else + + isfunc = 1; + } else { + trapreturn = -2; /* not incremented, used at current level */ + execode(sigfn, 1, 0); + + isfunc = 0; + } runhookdef(AFTERTRAPHOOK, NULL); - if (trapreturn > 0) + if (trapreturn > 0 && isfunc) { + /* + * Context was its own function. We propagate the return + * value specially. Return value zero means don't do + * anything special, so don't handle it. + */ trapret = trapreturn; - else if (errflag) + } else if (trapreturn >= 0 && !isfunc) { + /* + * Context was an inline trap. If an explicit return value + * was used, we need to set `lastval'. Otherwise we use the + * value restored by execrestore. In this case, all return + * values indicate an explicit return from the current function, + * so always handle specially. trapreturn is always restored by + * execrestore. + */ + trapret = trapreturn + 1; + } else if (errflag) trapret = 1; - if (sig != SIGEXIT && sig != SIGDEBUG) - execrestore(); + execrestore(); lexrestore(); if (trapret > 0) { - breaks = loops; - errflag = 1; + if (isfunc) { + breaks = loops; + errflag = 1; + } else { + lastval = trapret-1; + } } else { breaks += obreaks; if (breaks > loops) diff --git a/Test/C03traps.ztst b/Test/C03traps.ztst index 81ef38a30..26ba73da5 100644 --- a/Test/C03traps.ztst +++ b/Test/C03traps.ztst @@ -196,3 +196,19 @@ f functions TRAPWINCH 1:Unsetting ordinary traps with localtraps. + +# +# Returns from within traps are a perennial problem. +# The following two apply to returns in and around standard +# ksh-style traps. The intention is that a return value from +# within the function is preserved (i.e. statuses set by the trap +# are ignored) unless the trap explicitly executes `return', which makes +# it return from the enclosing function. +# + fn() { trap 'true' EXIT; return 1; } + fn +1: ksh-style EXIT traps preserve return value + + inner() { trap 'return 3' EXIT; return 2: } + outer() { inner; return 1; } +3: ksh-style EXIT traps can force return status of enclosing function |